Hi,
I've got an existing (and well backed up as of a couple of minutes
ago) 5-drive RAID6 shown here:
c2stable ~ # mdadm --detail /dev/md7
/dev/md7:
Version : 1.2
Creation Time : Sun Jan 16 17:02:24 2011
Raid Level : raid6
Array Size : 395387904 (377.07 GiB 404.88 GB)
Used Dev Size : 131795968 (125.69 GiB 134.96 GB)
Raid Devices : 5
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Sun Jan 23 10:25:41 2011
State : clean
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Name : c2stable:7 (local to host c2stable)
UUID : ded5e0c6:1a5a73ad:01949557:bb4e015a
Events : 17
Number Major Minor RaidDevice State
0 8 7 0 active sync /dev/sda7
1 8 23 1 active sync /dev/sdb7
2 8 39 2 active sync /dev/sdc7
3 8 50 3 active sync /dev/sdd2
4 8 66 4 active sync /dev/sde2
c2stable ~ #
I would like to change this RAID to a smaller chunk size. (16K for
now) What is the right command to use?
From Google and the mdadm man pages I'm coming up with something like:
mdadm --grow /dev/md7 --level=6 --chunk=16 --backup-file=/root/backup-md7
Maybe I don't need --level because the level isn't changing? Neither
is the number of drives.
Thanks in advance,
Mark
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