Hi Folks,
I am looking to verify a RAID1 setup by examining the individual
devices in the array, but having some issues. Here's is what I'm
working with:
# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md2 : active raid1 sdb5[2] sda5[0]
2925435456 blocks super 1.2 [2/2] [UU]
md1 : active raid1 sdb2[1] sda2[0]
2097088 blocks [2/2] [UU]
md0 : active raid1 sdb1[1] sda1[0]
2490176 blocks [2/2] [UU]
# fdisk -l
Disk /dev/sda: 2.7 TiB, 3000592982016 bytes, 5860533168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: ADC4268A-1555-40E4-A684-B366EC60F94F
Device Start End Sectors Size Type
/dev/sda1 2048 4982527 4980480 2.4G Linux RAID
/dev/sda2 4982528 9176831 4194304 2G Linux RAID
/dev/sda5 9453280 5860326239 5850872960 2.7T Linux RAID
...
Disk /dev/sdb: 2.7 TiB, 3000592982016 bytes, 5860533168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 229F0A5C-AF3E-4FC6-9C78-44F6B62E8843
Device Start End Sectors Size Type
/dev/sdb1 2048 4982527 4980480 2.4G Linux RAID
/dev/sdb2 4982528 9176831 4194304 2G Linux RAID
/dev/sdb5 9453280 5860326239 5850872960 2.7T Linux RAID
The RAID is utilized with LVM, but I would like to inspect the
individual disks, to ensure that data is replicated in case of
failure. If I try to mount the individual drives, I run into issues:
# mount /dev/sdb5 /tmp/sdb5/
mount: unknown filesystem type 'linux_raid_member'
These (sd[ab]) drives are not explicitly mounted (at least in
/proc/mounts), yet this seems to cause a problem. So I'm curious:
1. Is it possible to mount these devices, while a RAID array is active?
2. If mounting is not possible, is there another way to verify that
each disk contains the correct data (besides /proc/mdstats or dd)?
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