[Evms-devel] Re: BBR & RAID

[Jan V. H. <ja...@vi...>]

Thank you for your response!

 I admire the documentation work done, and have indeed already read the
pieces you referred me to. However, I am still clueless to these
question.

 A) Is it is enough to add a BBR segment to have the BBR functionality
 B) or should I also add a "feature object"
 C) and should I on top of that run "badbloks"?

 My worry is that the GUI does not warn me of what I have done is
stupid, and end up with three layers badblock relocation logic working
against each other.

 Btw; my ext3 format + badblocks is now running on 36hours+. Does
anybody know how long I should expect it to take in this scenario? 

  regards Jan

On Tue, 2004-02-24 at 15:40, Jan Vittrup Hansen wrote:
 > Hi All,
 > 
 >  I tried the manual, googling & looking through the archives, but
 > haven't been able to come up with an understanding of how to properly
 > combine EVMS, BBR & RAID - hope you guys can help me out.
 > 
 > I'm quite new to this, so please excuse me if I mess up the concepts
 > below. I've configure three 120GB drives via the GUI as:
 > 
 > /dev/evms/myDisk [Ext2/3]
 > (-) bbr [BBR]
 >     (-) md/md0 [MDraid5RegMgr]
 >          (-)hde_bbr [BBRseg] 
 >              hde [LocalDskMgr]
 >          (-)hdh_bbr [BBRseg] 
 >              hdh [LocalDskMgr]
 >          (-)hdg_bbr [BBRseg] 
 >              hdg [LocalDskMgr]
 > 
 > i.e. A BBR segment has been added to each disk, a RAID set constructed
 > and a BBR feature object added to the RAID. Finally when I saved my
 > changes the GUI asked (a.o.) whether I wanted to check the disks for R/W
 > errors, and I said yes. 
 > 
 > It seems to me that I may have added a little too much BBR functionality
 > -  the disks have now been formatting for roughly 24 hours and seem
 > about to melt.
 > 
 >  a) Should I not have added the BBR feature object - i.e. is just the
 > BBR segment stuff enough?
 
 I would remove the BBR feature object.
 
 > 
 >  b) Is running BadBlocks on a BBR manages drive not redundant at the
 > best? I mean, this should be taken care of by the layer, right?
 > 
 
 You may find the following document helpful:
 (BBR Segment section) http://evms.sourceforge.net/users_guide/#id2870685
 (EVMS User Guide) http://evms.sourceforge.net/users_guide/
 
 Regards,
 Mike T.