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Re: [smartmontools-support] additional information on "cciss" device support?
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From: Wolford, J. (HP S. - W. S. performance)
<jef...@hp...> - 2015-05-14 02:44:34
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See comments below Jeff | | However, these seem to leave out a lot of details on how the CCISS support | works. Am I missing some other documentation on the CCISS support that I | should be looking at? [JWW> ] The following is rather dated... but Compaq Command Interface for SCSI-3 Support CCISS Interface Specification http://sourceforge.net/projects/cciss/files/CCISS%20Interface%20Specification/CISS%20Interface%20Specification%20May%202008/OpenCISS_Specification.pdf/download Much newer info can be found in the source code on sourceforge The source code for both the hpsa scsi port (newer controllers w/newer OS releases) and the cciss block layer driver can be found on sourceforge: http://sourceforge.net/projects/cciss/files/ | | Some examples of things that have come up: | | * how do the drives get assigned to the "N" index used in the "-d | cciss,N" option? (They don't show up in the same order as the | hpacucli utility uses....) [JWW> ] N index also does not come up in the same order as device enumeration order I match the devices using the drive serial number that is at the top of the smart output.... (That same S/N is available with hpacucli / hpssacli... BTW: hpssacli replaced hpacucli going on 2 years ago :-) | | * When I use "-d sat" on an USB bridge, the output of "smartctl -a" | looks essentially the same as what I get from a directly-connected SATA | drive... but the output from a "-d cciss,0" command is much shorter | (even when the drive in question is a SATA drive). What controls the | information included in the output, and would it matter what Linux | kernel version I'm running, etc. (Is there any way to view the | SMART Attributes table, for example?) [JWW> ] Did you use EXACT same drive behind the USB bridge as you did behind a Smart Array ? (not the same model, but the exact same drive) The smart information available is VERY dependent on the drive model and the firmware it has on it. | | * The Supported_RAID-Controllers wiki page lists the device file to use | under Linux as "/dev/sdX", but on our systems the actual device is | /dev/cciss/sXdX. Is this an outright mistake (copied from the line | for another device type?) on the wiki page, or a change between Linux | versions or something along those lines? [JWW> ] Depending on which Smart Array and which OS / Version, the controller will be supported by the cciss [ block layer] or hpsa driver [ scsi port]. See reference above to sourceforge on where the source code is. For cciss driver, the entries are in the /dev/cciss/cXdYsZ (you forgot a controller number cX, starting with 0 and dY is the Drive Array number) Between that I have not done a cciss driver [been using hpsa] nor partitions or multiple logical drives per array, for more than 2 years, I could be wrong on what the sZ means, but I "think" the sZ gets added when you create more than one partition or logical drive per array but could be wrong... I don't recall the sZ in my usage. | | | Thanks. | | Nathan | ---------------------------------------------------------------------------- | Nathan Stratton Treadway - nat...@on... - Mid-Atlantic region | Ray Ontko & Co. - Software consulting services - http://www.ontko.com/ | GPG Key: http://www.ontko.com/~nathanst/gpg_key.txt ID: 1023D/ECFB6239 | Key fingerprint = 6AD8 485E 20B9 5C71 231C 0C32 15F3 ADCD ECFB 6239 | | ------------------------------------------------------------------------------ | One dashboard for servers and applications across Physical-Virtual-Cloud Widest | out-of-the-box monitoring support with 50+ applications Performance metrics, stats | and reports that give you Actionable Insights Deep dive visibility with transaction | tracing using APM Insight. | http://ad.doubleclick.net/ddm/clk/290420510;117567292;y | _______________________________________________ | Smartmontools-support mailing list | Sma...@li... | https://lists.sourceforge.net/lists/listinfo/smartmontools-support |
