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Generally speaking, /dev/sdaX and /dev/sdbX are always associated, while /dev/sdcX and /dev/sddX are always associated. Consult the RAID configuration document for the model of DPU with which you're working to determine the corresponding device in the RAID pair. To re-assemble the RAID, note the device that is still in the RAID - in this case, it's /dev/sdc2. When a device is missing, the RAID system will not tell you which device used to be a part of that RAID.
#SOFTRAID ERROR SOFTWARE#
Missing drive in RAID More often than not, when a software RAID is degraded, the nature of the problem causes the drive to no longer show up at all. Replace the drive as necessary, then add it back into the appropriate RAID: Note you must specify the particular RAID device in question:
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Use the following command to remove all failed disks from a RAID. If a device has failed, it must be removed before it can be re-added. Mdadm is the command for creating, manipulating, and repairing software RAIDs. It's running off of the physical device /dev/sdc, but the other half of the mirror is missing. Here, the virtual disk device /dev/md0 is also active and degraded. Since this is a mirrored array (RAID1), /dev/md0 can still be used until /dev/sdc also fails.Ī degraded software RAID with a Missing Device looks like ~]# cat /proc/mdstat Personalities : md1 : active raid1 sde sdd 1048512 blocks md0 : active raid512 blocks unused devices: Here, the virtual disk device /dev/md0 is active, but degraded, because one of its disks, /dev/sdb has failed, indicated by the (F), and the missing U. Degraded RAIDsĪ degraded Software RAID with a Failed Device looks like ~]# cat /proc/mdstat Personalities : md1 : active raid1 sde sdd 1048512 blocks md0 : active raid1 sdc sdb(F) 1048512 blocks unused devices: There should never be any unused devices, since we do not configure spare devices into any of our software RAIDs. Failed, offline, or missing devices would be indicated with an underscore, as in or. Each U corresponds to a constituent device of the RAID. This is determined automatically, and rarely significant. The number in brackets following each device indicate the number of that device in the RAID.All Unitrends software RAIDs as of this writing are composed of exactly two other devices. These can be physical devices (starting with sd) or other RAID devices (starting with md). The items in the format sdXN describe the devices which compose the RAID.The raid1/raid0 keyword describes the type of this RAID.
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All devices should be active in a normally functioning DPU.