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From: Jesse C. S. <jsm...@ga...> - 2006-10-06 19:06:40
Attachments:
jsmillie.vcf
BitDefender.txt
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Hello once again everyone. Since the new school year started we have been noticing increasingly high I/O usage on our servers. When I run the top command quite often you will see the WA status swing from really low up into the 70-80 even 90% range for up to a min and then drop again. I spend a little time trying to track down the problem and have noticed the following: When I/O is really high I always see the following line in "ps aux | grep D": 1229 14619 0.8 0.2 37272 16520 ? D 14:43 0:00 /usr/local/usermin-1.230/mailbox/delete_mail.cgi (Note: User ID is normally not the same one when polled) Sometimes I also see the index.cgi file too, but no where near as much as the above. A coworker in our department had made mention that maybe whats happening has something do with the process that usermin uses to remove mail from a mailbox when its deleted. Something about compacting the box during the delete instead of doing it like Thunderbird and waiting to compact until space can be saved. I guess case being all the reading and rewriting required to removed the dead message from the box. I don't recall having this problem that bad last year. On occassion when almost everyone was logged in things would get a little screwy, but not like this. General information about our config: Server: Processors: Dual Opteron 242's Ram: 6Gig ECC DDR HDs: 1.2 TB 3ware Raid Array OS: Slamd 64 10.2b (Slackware more or less) Kernel: 2.6.18 Usermin Version: 1.230 (This was happening in the last version too however. I just upgraded two days ago to see if the problem went away) Unfortunately dealing with I/O problems isn't my speciality so I could be barking up the wrong tree here. Any suggestions would be greatly appriciated as always... -Jesse Gateway School District Monroeville, PA |
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From: Jamie C. <jca...@we...> - 2006-10-06 19:24:36
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On 6/Oct/2006 12:06 Jesse C. Smillie wrote .. > Hello once again everyone. Since the new school year started we have > been noticing increasingly high I/O usage on our servers. When I run > the top command quite often you will see the WA status swing from really > low up into the 70-80 even 90% range for up to a min and then drop > again. I spend a little time trying to track down the problem and have > noticed the following: > > When I/O is really high I always see the following line in "ps aux | > grep D": > 1229 14619 0.8 0.2 37272 16520 ? D 14:43 0:00 > /usr/local/usermin-1.230/mailbox/delete_mail.cgi > > (Note: User ID is normally not the same one when polled) > > Sometimes I also see the index.cgi file too, but no where near as much > as the above. > > A coworker in our department had made mention that maybe whats happening > has something do with the process that usermin uses to remove mail from > a mailbox when its deleted. Something about compacting the box during > the delete instead of doing it like Thunderbird and waiting to compact > until space can be saved. I guess case being all the reading and > rewriting required to removed the dead message from the box. > > I don't recall having this problem that bad last year. On occassion > when almost everyone was logged in things would get a little screwy, but > not like this. > > General information about our config: > Server: > Processors: Dual Opteron 242's > Ram: 6Gig ECC DDR > HDs: 1.2 TB 3ware Raid Array > OS: Slamd 64 10.2b (Slackware more or less) > Kernel: 2.6.18 > Usermin Version: 1.230 (This was happening in the last version too > however. I just upgraded two days ago to see if the problem went away) > > Unfortunately dealing with I/O problems isn't my speciality so I could > be barking up the wrong tree here. Any suggestions would be greatly > appriciated as always... What format are your mailboxes in? If they are in mbox format (one file per user), when Usermin deletes email it will re-write out the entire mail file with the removed emails taken out. As you might expect, this could cause substantial disk IO on large mail files.. The solution I used was to switch to Maildir format, in which each email is stored in a separate file. Deleting from this format is much quicker.. - Jamie |
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From: Jesse C. S. <jsm...@ga...> - 2006-10-07 04:26:26
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Currently I'm using Sendmail with the mbox format. What you say does make sense though. Towards the end of the year I did notice our email traffic increasing so it would be only reasonable that the old way of doing things could cause us issues with incoming mail on the rise. Doing a quick search on google I noticed that doing Maildir shouldn't be a huge problem with some minor mods to promailrc. However what I don't understand is does that mean new mail goes into /var/spool/mail/username/<messages here> or would it be ~username/mail/inbox/<messages here>? Lastly, as far as the conversion is usermin cabable of reading two different formats at a time? I ask because I wonder can I just convert say all the inboxs first, wait to see what it does, and then convert all of their personal folders. Or do I need to do both sides of the puzzle at the same time? We currently are using Dovecot for the Pop3 / Imap side of things and it appears to be really easy to convert to the different setting. Thanks Jaime, bTw. -Jesse Jamie Cameron wrote: > On 6/Oct/2006 12:06 Jesse C. Smillie wrote .. > >> Hello once again everyone. Since the new school year started we have >> been noticing increasingly high I/O usage on our servers. When I run >> the top command quite often you will see the WA status swing from really >> low up into the 70-80 even 90% range for up to a min and then drop >> again. I spend a little time trying to track down the problem and have >> noticed the following: >> >> When I/O is really high I always see the following line in "ps aux | >> grep D": >> 1229 14619 0.8 0.2 37272 16520 ? D 14:43 0:00 >> /usr/local/usermin-1.230/mailbox/delete_mail.cgi >> >> (Note: User ID is normally not the same one when polled) >> >> Sometimes I also see the index.cgi file too, but no where near as much >> as the above. >> >> A coworker in our department had made mention that maybe whats happening >> has something do with the process that usermin uses to remove mail from >> a mailbox when its deleted. Something about compacting the box during >> the delete instead of doing it like Thunderbird and waiting to compact >> until space can be saved. I guess case being all the reading and >> rewriting required to removed the dead message from the box. >> >> I don't recall having this problem that bad last year. On occassion >> when almost everyone was logged in things would get a little screwy, but >> not like this. >> >> General information about our config: >> Server: >> Processors: Dual Opteron 242's >> Ram: 6Gig ECC DDR >> HDs: 1.2 TB 3ware Raid Array >> OS: Slamd 64 10.2b (Slackware more or less) >> Kernel: 2.6.18 >> Usermin Version: 1.230 (This was happening in the last version too >> however. I just upgraded two days ago to see if the problem went away) >> >> Unfortunately dealing with I/O problems isn't my speciality so I could >> be barking up the wrong tree here. Any suggestions would be greatly >> appriciated as always... >> > > What format are your mailboxes in? If they are in mbox format (one file per > user), when Usermin deletes email it will re-write out the entire mail > file with the removed emails taken out. As you might expect, this could cause > substantial disk IO on large mail files.. > > The solution I used was to switch to Maildir format, in which each email is stored > in a separate file. Deleting from this format is much quicker.. > > - Jamie > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys -- and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > - > Forwarded by the Webmin mailing list at web...@li... > To remove yourself from this list, go to > http://lists.sourceforge.net/lists/listinfo/webadmin-list > > ------------------------------------------------------------- > This mail was scanned by a trial version of BitDefender > For more informations please visit http://www.bitdefender.com > > > ------------------------------------------------------------- > |
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From: Jamie C. <jca...@we...> - 2006-10-07 04:49:28
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On 6/Oct/2006 21:25 Jesse C. Smillie wrote .. > Currently I'm using Sendmail with the mbox format. What you say does > make sense though. Towards the end of the year I did notice our email > traffic increasing so it would be only reasonable that the old way of > doing things could cause us issues with incoming mail on the rise. > > Doing a quick search on google I noticed that doing Maildir shouldn't be > a huge problem with some minor mods to promailrc. However what I don't > understand is does that mean new mail goes into > /var/spool/mail/username/<messages here> or would it be > ~username/mail/inbox/<messages here>? Typically, the inbox for Maildir format is ~/Maildir . You can have mail delivered to this with a line in /etc/procmailrc like DEFAULT=$HOME/Maildir/ > Lastly, as far as the conversion is usermin cabable of reading two > different formats at a time? I ask because I wonder can I just convert > say all the inboxs first, wait to see what it does, and then convert all > of their personal folders. Or do I need to do both sides of the puzzle > at the same time? Yes, it can read both - you can have the inbox in Maildir format, but keep other folders in mbox format under users' ~/mail directories. - Jamie > We currently are using Dovecot for the Pop3 / Imap side of things and it > appears to be really easy to convert to the different setting. > > Thanks Jaime, bTw. > -Jesse > > > Jamie Cameron wrote: > > On 6/Oct/2006 12:06 Jesse C. Smillie wrote .. > > > >> Hello once again everyone. Since the new school year started we have > >> been noticing increasingly high I/O usage on our servers. When I run > >> the top command quite often you will see the WA status swing from really > >> low up into the 70-80 even 90% range for up to a min and then drop > >> again. I spend a little time trying to track down the problem and have > >> noticed the following: > >> > >> When I/O is really high I always see the following line in "ps aux | > >> grep D": > >> 1229 14619 0.8 0.2 37272 16520 ? D 14:43 0:00 > >> /usr/local/usermin-1.230/mailbox/delete_mail.cgi > >> > >> (Note: User ID is normally not the same one when polled) > >> > >> Sometimes I also see the index.cgi file too, but no where near as much > >> as the above. > >> > >> A coworker in our department had made mention that maybe whats happening > >> has something do with the process that usermin uses to remove mail from > >> a mailbox when its deleted. Something about compacting the box during > >> the delete instead of doing it like Thunderbird and waiting to compact > >> until space can be saved. I guess case being all the reading and > >> rewriting required to removed the dead message from the box. > >> > >> I don't recall having this problem that bad last year. On occassion > >> when almost everyone was logged in things would get a little screwy, > but > >> not like this. > >> > >> General information about our config: > >> Server: > >> Processors: Dual Opteron 242's > >> Ram: 6Gig ECC DDR > >> HDs: 1.2 TB 3ware Raid Array > >> OS: Slamd 64 10.2b (Slackware more or less) > >> Kernel: 2.6.18 > >> Usermin Version: 1.230 (This was happening in the last version too > >> however. I just upgraded two days ago to see if the problem went away) > >> > >> Unfortunately dealing with I/O problems isn't my speciality so I could > >> be barking up the wrong tree here. Any suggestions would be greatly > >> appriciated as always... > >> > > > > What format are your mailboxes in? If they are in mbox format (one file > per > > user), when Usermin deletes email it will re-write out the entire mail > > file with the removed emails taken out. As you might expect, this could > cause > > substantial disk IO on large mail files.. > > > > The solution I used was to switch to Maildir format, in which each email > is stored > > in a separate file. Deleting from this format is much quicker.. > > > > - Jamie > > > > ------------------------------------------------------------------------- > > Take Surveys. Earn Cash. Influence the Future of IT > > Join SourceForge.net's Techsay panel and you'll get the chance to share > your > > opinions on IT & business topics through brief surveys -- and earn cash > > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > > - > > Forwarded by the Webmin mailing list at web...@li... > > To remove yourself from this list, go to > > http://lists.sourceforge.net/lists/listinfo/webadmin-list > > > > ------------------------------------------------------------- > > This mail was scanned by a trial version of BitDefender > > For more informations please visit http://www.bitdefender.com > > > > > > ------------------------------------------------------------- > > > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share > your > opinions on IT & business topics through brief surveys -- and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > - > Forwarded by the Webmin mailing list at web...@li... > To remove yourself from this list, go to > http://lists.sourceforge.net/lists/listinfo/webadmin-list |
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From: <ra...@si...> - 2006-10-08 04:49:38
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I have been fighting this problem for some time now, and it always seems to be specific users from specific PC's, and I can never personally reproduce the problem, but just see the results of it's occurance (though I have taken some interesting core files that seem to point to a Perl related issue). However, as I am also using Dovecot for pop/imap, I changed the access to using localhost imap, and the problem seems to have not returned for these users. rf On Fri, 6 Oct 2006, Jamie Cameron wrote: > On 6/Oct/2006 21:25 Jesse C. Smillie wrote .. >> Currently I'm using Sendmail with the mbox format. What you say does >> make sense though. Towards the end of the year I did notice our email >> traffic increasing so it would be only reasonable that the old way of >> doing things could cause us issues with incoming mail on the rise. >> >> Doing a quick search on google I noticed that doing Maildir shouldn't be >> a huge problem with some minor mods to promailrc. However what I don't >> understand is does that mean new mail goes into >> /var/spool/mail/username/<messages here> or would it be >> ~username/mail/inbox/<messages here>? > > Typically, the inbox for Maildir format is ~/Maildir . > You can have mail delivered to this with a line in /etc/procmailrc like > > DEFAULT=$HOME/Maildir/ > >> Lastly, as far as the conversion is usermin cabable of reading two >> different formats at a time? I ask because I wonder can I just convert >> say all the inboxs first, wait to see what it does, and then convert all >> of their personal folders. Or do I need to do both sides of the puzzle >> at the same time? > > Yes, it can read both - you can have the inbox in Maildir format, but > keep other folders in mbox format under users' ~/mail directories. > > - Jamie > >> We currently are using Dovecot for the Pop3 / Imap side of things and it >> appears to be really easy to convert to the different setting. >> >> Thanks Jaime, bTw. >> -Jesse >> >> >> Jamie Cameron wrote: >>> On 6/Oct/2006 12:06 Jesse C. Smillie wrote .. >>> >>>> Hello once again everyone. Since the new school year started we have >>>> been noticing increasingly high I/O usage on our servers. When I run >>>> the top command quite often you will see the WA status swing from really >>>> low up into the 70-80 even 90% range for up to a min and then drop >>>> again. I spend a little time trying to track down the problem and have >>>> noticed the following: >>>> >>>> When I/O is really high I always see the following line in "ps aux | >>>> grep D": >>>> 1229 14619 0.8 0.2 37272 16520 ? D 14:43 0:00 >>>> /usr/local/usermin-1.230/mailbox/delete_mail.cgi >>>> >>>> (Note: User ID is normally not the same one when polled) >>>> >>>> Sometimes I also see the index.cgi file too, but no where near as much >>>> as the above. >>>> >>>> A coworker in our department had made mention that maybe whats happening >>>> has something do with the process that usermin uses to remove mail from >>>> a mailbox when its deleted. Something about compacting the box during >>>> the delete instead of doing it like Thunderbird and waiting to compact >>>> until space can be saved. I guess case being all the reading and >>>> rewriting required to removed the dead message from the box. >>>> >>>> I don't recall having this problem that bad last year. On occassion >>>> when almost everyone was logged in things would get a little screwy, >> but >>>> not like this. >>>> >>>> General information about our config: >>>> Server: >>>> Processors: Dual Opteron 242's >>>> Ram: 6Gig ECC DDR >>>> HDs: 1.2 TB 3ware Raid Array >>>> OS: Slamd 64 10.2b (Slackware more or less) >>>> Kernel: 2.6.18 >>>> Usermin Version: 1.230 (This was happening in the last version too >>>> however. I just upgraded two days ago to see if the problem went away) >>>> >>>> Unfortunately dealing with I/O problems isn't my speciality so I could >>>> be barking up the wrong tree here. Any suggestions would be greatly >>>> appriciated as always... >>>> >>> >>> What format are your mailboxes in? If they are in mbox format (one file >> per >>> user), when Usermin deletes email it will re-write out the entire mail >>> file with the removed emails taken out. As you might expect, this could >> cause >>> substantial disk IO on large mail files.. >>> >>> The solution I used was to switch to Maildir format, in which each email >> is stored >>> in a separate file. Deleting from this format is much quicker.. >>> >>> - Jamie >>> >>> ------------------------------------------------------------------------- >>> Take Surveys. Earn Cash. Influence the Future of IT >>> Join SourceForge.net's Techsay panel and you'll get the chance to share >> your >>> opinions on IT & business topics through brief surveys -- and earn cash >>> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >>> - >>> Forwarded by the Webmin mailing list at web...@li... >>> To remove yourself from this list, go to >>> http://lists.sourceforge.net/lists/listinfo/webadmin-list >>> >>> ------------------------------------------------------------- >>> This mail was scanned by a trial version of BitDefender >>> For more informations please visit http://www.bitdefender.com >>> >>> >>> ------------------------------------------------------------- >>> >> >> >> ------------------------------------------------------------------------- >> Take Surveys. Earn Cash. Influence the Future of IT >> Join SourceForge.net's Techsay panel and you'll get the chance to share >> your >> opinions on IT & business topics through brief surveys -- and earn cash >> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >> - >> Forwarded by the Webmin mailing list at web...@li... >> To remove yourself from this list, go to >> http://lists.sourceforge.net/lists/listinfo/webadmin-list > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys -- and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > - > Forwarded by the Webmin mailing list at web...@li... > To remove yourself from this list, go to > http://lists.sourceforge.net/lists/listinfo/webadmin-list > |
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From: Jesse C. S. <jsm...@ga...> - 2006-10-08 05:07:04
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I think I'll try that to and see what happens. However for the long term I think I'll also change our mail delivery systems too because its looking like our mail load is only going to get bigger as time goes by.:> Thank you both for the help and suggestions. -Jesse ra...@si... wrote: > I have been fighting this problem for some time now, and it always seems > to be specific users from specific PC's, and I can never personally > reproduce the problem, but just see the results of it's occurance (though > I have taken some interesting core files that seem to point to a Perl > related issue). > > However, as I am also using Dovecot for pop/imap, I changed the access > to using localhost imap, and the problem seems to have not returned for > these users. > > rf > > On Fri, 6 Oct 2006, Jamie Cameron wrote: > > >> On 6/Oct/2006 21:25 Jesse C. Smillie wrote .. >> >>> Currently I'm using Sendmail with the mbox format. What you say does >>> make sense though. Towards the end of the year I did notice our email >>> traffic increasing so it would be only reasonable that the old way of >>> doing things could cause us issues with incoming mail on the rise. >>> >>> Doing a quick search on google I noticed that doing Maildir shouldn't be >>> a huge problem with some minor mods to promailrc. However what I don't >>> understand is does that mean new mail goes into >>> /var/spool/mail/username/<messages here> or would it be >>> ~username/mail/inbox/<messages here>? >>> >> Typically, the inbox for Maildir format is ~/Maildir . >> You can have mail delivered to this with a line in /etc/procmailrc like >> >> DEFAULT=$HOME/Maildir/ >> >> >>> Lastly, as far as the conversion is usermin cabable of reading two >>> different formats at a time? I ask because I wonder can I just convert >>> say all the inboxs first, wait to see what it does, and then convert all >>> of their personal folders. Or do I need to do both sides of the puzzle >>> at the same time? >>> >> Yes, it can read both - you can have the inbox in Maildir format, but >> keep other folders in mbox format under users' ~/mail directories. >> >> - Jamie >> >> >>> We currently are using Dovecot for the Pop3 / Imap side of things and it >>> appears to be really easy to convert to the different setting. >>> >>> Thanks Jaime, bTw. >>> -Jesse >>> >>> >>> Jamie Cameron wrote: >>> >>>> On 6/Oct/2006 12:06 Jesse C. Smillie wrote .. >>>> >>>> >>>>> Hello once again everyone. Since the new school year started we have >>>>> been noticing increasingly high I/O usage on our servers. When I run >>>>> the top command quite often you will see the WA status swing from really >>>>> low up into the 70-80 even 90% range for up to a min and then drop >>>>> again. I spend a little time trying to track down the problem and have >>>>> noticed the following: >>>>> >>>>> When I/O is really high I always see the following line in "ps aux | >>>>> grep D": >>>>> 1229 14619 0.8 0.2 37272 16520 ? D 14:43 0:00 >>>>> /usr/local/usermin-1.230/mailbox/delete_mail.cgi >>>>> >>>>> (Note: User ID is normally not the same one when polled) >>>>> >>>>> Sometimes I also see the index.cgi file too, but no where near as much >>>>> as the above. >>>>> >>>>> A coworker in our department had made mention that maybe whats happening >>>>> has something do with the process that usermin uses to remove mail from >>>>> a mailbox when its deleted. Something about compacting the box during >>>>> the delete instead of doing it like Thunderbird and waiting to compact >>>>> until space can be saved. I guess case being all the reading and >>>>> rewriting required to removed the dead message from the box. >>>>> >>>>> I don't recall having this problem that bad last year. On occassion >>>>> when almost everyone was logged in things would get a little screwy, >>>>> >>> but >>> >>>>> not like this. >>>>> >>>>> General information about our config: >>>>> Server: >>>>> Processors: Dual Opteron 242's >>>>> Ram: 6Gig ECC DDR >>>>> HDs: 1.2 TB 3ware Raid Array >>>>> OS: Slamd 64 10.2b (Slackware more or less) >>>>> Kernel: 2.6.18 >>>>> Usermin Version: 1.230 (This was happening in the last version too >>>>> however. I just upgraded two days ago to see if the problem went away) >>>>> >>>>> Unfortunately dealing with I/O problems isn't my speciality so I could >>>>> be barking up the wrong tree here. Any suggestions would be greatly >>>>> appriciated as always... >>>>> >>>>> >>>> What format are your mailboxes in? If they are in mbox format (one file >>>> >>> per >>> >>>> user), when Usermin deletes email it will re-write out the entire mail >>>> file with the removed emails taken out. As you might expect, this could >>>> >>> cause >>> >>>> substantial disk IO on large mail files.. >>>> >>>> The solution I used was to switch to Maildir format, in which each email >>>> >>> is stored >>> >>>> in a separate file. Deleting from this format is much quicker.. >>>> >>>> - Jamie >>>> >>>> ------------------------------------------------------------------------- >>>> Take Surveys. Earn Cash. Influence the Future of IT >>>> Join SourceForge.net's Techsay panel and you'll get the chance to share >>>> >>> your >>> >>>> opinions on IT & business topics through brief surveys -- and earn cash >>>> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >>>> - >>>> Forwarded by the Webmin mailing list at web...@li... >>>> To remove yourself from this list, go to >>>> http://lists.sourceforge.net/lists/listinfo/webadmin-list >>>> >>>> ------------------------------------------------------------- >>>> This mail was scanned by a trial version of BitDefender >>>> For more informations please visit http://www.bitdefender.com >>>> >>>> >>>> ------------------------------------------------------------- >>>> >>>> >>> ------------------------------------------------------------------------- >>> Take Surveys. Earn Cash. Influence the Future of IT >>> Join SourceForge.net's Techsay panel and you'll get the chance to share >>> your >>> opinions on IT & business topics through brief surveys -- and earn cash >>> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >>> - >>> Forwarded by the Webmin mailing list at web...@li... >>> To remove yourself from this list, go to >>> http://lists.sourceforge.net/lists/listinfo/webadmin-list >>> >> ------------------------------------------------------------------------- >> Take Surveys. Earn Cash. Influence the Future of IT >> Join SourceForge.net's Techsay panel and you'll get the chance to share your >> opinions on IT & business topics through brief surveys -- and earn cash >> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >> - >> Forwarded by the Webmin mailing list at web...@li... >> To remove yourself from this list, go to >> http://lists.sourceforge.net/lists/listinfo/webadmin-list >> >> > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys -- and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > - > Forwarded by the Webmin mailing list at web...@li... > To remove yourself from this list, go to > http://lists.sourceforge.net/lists/listinfo/webadmin-list > > ------------------------------------------------------------- > This mail was scanned by a trial version of BitDefender > For more informations please visit http://www.bitdefender.com > > > ------------------------------------------------------------- > |
