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I had a software RAID5 setup with mdadm and my onboard RAID-controller. It was a 4x1TB RAID5 giving me a total of 3TB. Yesterday I added one more 1TB disk with these commands
mdadm --add /dev/md0 /dev/sdf1
mdadm --grow /dev/md0 --raid-devices=5 --backupfile=/mnt/temp/backupfileraid5
In the begining the speed was around 13MB/s but today when I checked the progress, this is what I saw:
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdf1[4] sde1[0] sdc1[3] sdb1[2] sdd1[1]
2930279424 blocks super 1.2 level 5, 64k chunk, algorithm 2 [5/5] [UUUUU]
[>....................] reshape = 3.6% (35387136/976759808) finish=58349.5min speed=267K/sec
unused devices: <none>
# cat /proc/sys/dev/raid/speed_limit_min
30000
And I don't read or write to the array, so that is not the problem.
Does anyone have any creative ideas how to increase the reshape speed? :S
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Bumbelibump! Anyone?
$ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdf1[4] sde1[0] sdc1[3] sdb1[2] sdd1[1]
2930279424 blocks super 1.2 level 5, 64k chunk, algorithm 2 [5/5] [UUUUU]
[====>................] reshape = 22.9% (224112064/976759808) finish=117215.6min speed=105K/sec
unused devices: <none>
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I am using
5 2 TB drives
24gb ddr3
x58m board
Xeon 5550 CPU
This is what I am getting with nearly the same storage setup
root@xxxxxxxf(/etc) $ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdf1[5] sdb1[0] sde1[4] sdd1[2] sdc1[1]
5589036288 blocks super 1.2 level 5, 64k chunk, algorithm 2 [5/5] [UUUUU]
[========>............] reshape = 44.7% (832884860/1863012096) finish=706.3min speed=24306K/sec
Here is the settings I used to do it. You might want to use slightly smaller or larger stripe cache_size depending how much ram you have.
echo 6144 >> /sys/block/md3/md/stripe_cache_size
echo 75000 >> /sys/block/md3/md/sync_speed_min
echo 225000 >> /sys/block/md3/md/sync_speed_max
* The tweak will go away after a reboot unles syou add it to a boot up file. My reshape was going to take 3600 minutes I made the change and it dropped to 1100 minutes *
The speeds are pretty safe min/max
Adjust the cache in 1024 increments start at 3072 and go up use top and watch for sillyness and back it off a bit if it is getting hammered
It has already gone up while typing this.
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdf1[5] sdb1[0] sde1[4] sdd1[2] sdc1[1]
5589036288 blocks super 1.2 level 5, 64k chunk, algorithm 2 [5/5] [UUUUU]
[=========>...........] reshape = 45.2% (843672896/1863012096) finish=728.1min speed=23331K/sec
Hope this helps
2G33K4U
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Just realized the post is from 2009
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Just realized the post is from 2009
Indeed it is. Don't worry, it happens to all of us.
Closing.
Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
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How to Ask Questions the Smart Way
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