On Tue, 14 Feb 2012 10:30:37 -0700 Robert Woodworth <robertjwoodworth@xxxxxxxxx> wrote: > Has anyone ever thought of integrating SES managed enclosures into the > kernel RAID system? I briefly looked through the archives and have > not found anything on the topic. > > Some HW based RAID controllers do this flawlessly now, there is no > reason why the kernel RAID cannot also. (LSI MegaRAID) > > 1) When a drive is part if a managed enclosure, the RAID system should > address it by location instead of by enumerated device node. The SES > device in the enclosure can map the physical slot to a physical drive. > The RAID admin (mdamd) should be able to add/fail/identify devices > based on slot. Does this just mean that the admin should using names in /dev/disk/by-path/ rather than /dev/sdXX to address devices? What can md or mdadm do to help? > > 2) If the RAID system fails a drive, it should notify the SES > management and turn on the fail bit and the fail LED. "mdadm --monitor" will run a script on drive failure. This could easily notify the SES management. So maybe all we need here is a script to plug in to mdadm... Would you like to write one? > > 3) The RAID system should be able to turn on the 'identify' bit and > LEDs for an array or a single drive. Again, it sounds like you just need a script to ask mdadm which devices are included in a given array, and then do whatever magic is needed to turn on the light. It is fairly easy to extra the device list from the output of mdadm --detail --brief --verbose /dev/md/whatever but it might be good to make it easier to extra from mdadm --detail --export /dev/md/whatever Would you like to write such a script? > > I'm currently doing firmware on a managed enclosure. Although my > vendor only supports LSI MegaRAID, there is no reason why my > enclosures cannot work in the same manner on a kernel RAID system. > > > > Request for comments... It sounds to me like you just need a few scripts to provide some enclosure-specific functionality. I would be happy to include them in the mdadm distribution. Or maybe there is something that I didn't understand?? Thanks, NeilBrown > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html
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