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fincoop
Tux's lil' helper
Joined: 02 Feb 2004
Posts: 145
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 Posted: Thu Nov 07, 2024 2:18 pm Post subject: Growing RAID10 to larger partitions with MDADM |
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Hello all,
I started down the path of consolidating 3 partitions into 1 on my 4-disk RAID10. I needed more space on the 3rd and there was free space in the other two. In any case I sequentially failed each disk, deleted partition 2, and made partition 3 bigger (now partition 2). I added each back into the RAID10 and let it sync. So now I have 4 larger partitions in the RAID10, but I can't seem to get the RAID to expand to take advantage of it. The --grow --size command doesn't seem to work, or maybe it doesn't apply to RAID10. Can anyone offer a solution? I have a backup of the data but it's a large volume and would take days to restore, would like to avoid if possible.
| Code: |
>>> cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath]
md124 : active raid10 sda2[4] sdd2[7] sdc2[6] sdb2[5]
12222011392 blocks super 1.2 128K chunks 2 far-copies [4/4] [UUUU]
>>> mdadm -D /dev/md124
/dev/md124:
Version : 1.2
Creation Time : Sat Sep 9 08:44:18 2023
Raid Level : raid10
Array Size : 12222011392 (11.38 TiB 12.52 TB)
Used Dev Size : 6111005696 (5.69 TiB 6.26 TB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Thu Nov 7 09:16:11 2024
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : far=2
Chunk Size : 128K
Consistency Policy : resync
Name : server:volume
UUID : 2540f960:17291f2e:2c5f59be:821dcffa
Events : 51671
Number Major Minor RaidDevice State
4 8 2 0 active sync /dev/sda2
5 8 18 1 active sync /dev/sdb2
6 8 34 2 active sync /dev/sdc2
7 8 50 3 active sync /dev/sdd2
>>> mdadm --grow /dev/md124 --size=max
mdadm: Cannot set device size for /dev/md124: Invalid argument
>>> gdisk -l /dev/sda
GPT fdisk (gdisk) version 1.0.10
Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present
Found valid GPT with protective MBR; using GPT.
Disk /dev/sda: 15628053168 sectors, 7.3 TiB
Model: ST8000VN0022-2EL
Sector size (logical/physical): 512/4096 bytes
Disk identifier (GUID): 15124D11-1AA2-4D52-B261-54221B5278FD
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 15628053134
Partitions will be aligned on 2048-sector boundaries
Total free space is 2669 sectors (1.3 MiB)
Number Start (sector) End (sector) Size Code Name
1 2048 1258293247 600.0 GiB FD00 scratch
2 1258293248 15628052479 6.7 TiB FD00 volume
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fincoop
Tux's lil' helper
Joined: 02 Feb 2004
Posts: 145
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| Posted: Fri Nov 08, 2024 3:01 am Post subject: |
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I couldn't find a solution, so I ended up breaking one mirror out of the RAID10, creating a new array with the pair, which initialized at the larger size, then doing an rsync between the old mirror and the new one. It's not any faster than a full restore, but at least the files are online in the process. I read that mdadm will only let you fail drives that are part of the mirror. I tried another technique posted online to identify the mirror set using md5sum but that wasn't working for me.
| Code: |
madam /dev/oldarray --fail /dev/sda2
madam /dev/oldarray --fail /dev/sdc2
madam /dev/oldarray --remove /dev/sda2
madam /dev/oldarray --remove /dev/sdc2
mdadm --create /dev/newarray --chunk=128 --level=10 --raid-devices=4 --layout=o2 --run /dev/sda2 missing /dev/sdc2 missing
mkfs.ext4 -E stride=32,stripe_width=64 /dev/newarray
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