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RN104 Resync Speed on 3rd Drive Replacement Very Slow
I am updating my RN104 from 4 8Tb drives to 4 10Tb drives. After replacing the first drive, the resync took a couple of days to complete. After replacing the second drive, about the same length of ...
I rebooted the NAS and the resync speed increased to about 14 Mb/sec. I don't know what was causing the slow down before.
I do have backup jobs running Rsync. This particular NAS does not have any backups configured on it, but it is the NAS that recieves backups from another NAS.
The cat command gives:
Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md1 : active raid10 sdd2[3] sdc2[2] sdb2[1] sda2[0]
1044480 blocks super 1.2 512K chunks 2 near-copies [4/4] [UUUU]
md125 : active raid1 sdd5[0] sdc5[1]
1952278144 blocks super 1.2 [2/2] [UU]
md126 : active raid5 sdb4[6] sdd4[4] sda4[3] sdc4[5]
11720633664 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/3] [UU_U]
resync=DELAYED
md127 : active raid5 sdb3[6] sda3[7] sdd3[4] sdc3[5]
11706500352 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/3] [U_UU]
[================>....] recovery = 84.3% (3290015080/3902166784) finish=7 593.8min speed=1343K/sec
bitmap: 0/30 pages [0KB], 65536KB chunk
md0 : active raid1 sdb1[6] sda1[7] sdd1[4] sdc1[5]
4190208 blocks super 1.2 [4/4] [UUUU]
unused devices: <none>
The resync=DELAYED is interesting. What does this mean?
Thanks again for you help.
You have a multi-layer volume due to incremental drive size upgrades. Each layer is it's own RAID, and it can only sync one at a time. So the delayed one is waiting for the another to complete. The multiple layers may be contributing to the slower speed.
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