Hi to all.
I have a very very very very very old server with very old disks.
I would like to replace all disks with bigger (and newer) ones.
I *can* shutdown the server
As these disks are very old, I'm not really sure to simple power off,
replace one disk, power on and do the raid rebuild itself. What If the
"source" disk fails during the rebuild ?
Any better way to replace everything so that in case of failure, one
of the old disks in the mirror is still usable for replacement?
I can't add more disks (so, I can't convert a 2-way mirror to a 3-way mirror).
Another question: how can I know the last time mdadm checked the whole array ?
I have the check scheduled in the cron, but I would like to know the
last check time, just to be 100% sure that someone is checking....
# mdadm --detail /dev/md[0-4]
/dev/md0:
Version : 00.90.03
Creation Time : Wed Dec 5 11:41:05 2007
Raid Level : raid1
Array Size : 64128 (62.64 MiB 65.67 MB)
Used Dev Size : 64128 (62.64 MiB 65.67 MB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Mon Apr 22 15:46:44 2019
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : eb8220d3:c502ecc2:2310f28d:32523fcd
Events : 0.608
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 8 17 1 active sync /dev/sdb1
/dev/md1:
Version : 00.90.03
Creation Time : Wed Dec 5 11:41:41 2007
Raid Level : raid1
Array Size : 48829440 (46.57 GiB 50.00 GB)
Used Dev Size : 48829440 (46.57 GiB 50.00 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Mon Apr 22 15:47:15 2019
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : fc5d550c:ad284405:746c2f3c:cd8dab4a
Events : 0.728636
Number Major Minor RaidDevice State
0 8 2 0 active sync /dev/sda2
1 8 18 1 active sync /dev/sdb2
/dev/md2:
Version : 00.90.03
Creation Time : Wed Dec 5 11:30:47 2007
Raid Level : raid1
Array Size : 3903680 (3.72 GiB 4.00 GB)
Used Dev Size : 3903680 (3.72 GiB 4.00 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 2
Persistence : Superblock is persistent
Update Time : Mon Apr 22 15:46:56 2019
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : 8bd642e1:88162d31:af6aa5d4:0540aa20
Events : 0.52
Number Major Minor RaidDevice State
0 8 3 0 active sync /dev/sda3
1 8 19 1 active sync /dev/sdb3
/dev/md3:
Version : 00.90.03
Creation Time : Wed Dec 5 11:30:56 2007
Raid Level : raid1
Array Size : 679774272 (648.28 GiB 696.09 GB)
Used Dev Size : 679774272 (648.28 GiB 696.09 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 3
Persistence : Superblock is persistent
Update Time : Mon Apr 22 15:47:12 2019
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : 02c85a95:a01abf83:035c3537:8166f4a2
Events : 0.722938
Number Major Minor RaidDevice State
0 8 5 0 active sync /dev/sda5
1 8 21 1 active sync /dev/sdb5
/dev/md4:
Version : 00.90.03
Creation Time : Wed Oct 29 10:49:44 2008
Raid Level : raid1
Array Size : 976759936 (931.51 GiB 1000.20 GB)
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 4
Persistence : Superblock is persistent
Update Time : Mon Apr 22 15:47:07 2019
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : 50bb5667:325efa5f:a34f4cd3:49df660d
Events : 0.13867758
Number Major Minor RaidDevice State
0 8 33 0 active sync /dev/sdc1
1 8 49 1 active sync /dev/sdd1
