Raid 5 Reshape does not speed up

Hallo Freunde,

ich versuche mein RAID 5 von 3x3tb auf 4x3TB, 3x4TB zu erweitern (das es dabei 3TB nicht nutzbaren Speicher gibt ist mir klar, aber die 4TB Festplatten waren günstiger als die 3TB Festplatten). Ich habe deshalb mit dem Grow Button die neuen Festplatten hinzugefügt. Leider ist der Prozess extrem langsam und braucht so circa einen Monat. Ich habe bereits

root@frederiknas:~# sysctl dev.raid.speed_limit_max

dev.raid.speed_limit_max = 5000000

und

root@frederiknas:~# sysctl dev.raid.speed_limit_min

dev.raid.speed_limit_min = 500000

cat /proc/mdstat liefert

Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]
md127 : active raid5 sdj[7] sdh[6] sdg[5] sdf[4] sdb[1] sda[3] sdc[2]
      5860530176 blocks super 1.2 level 5, 512k chunk, algorithm 2 [7/7] [UUUUUUU]
      [=>...................]  reshape =  8.9% (263264660/2930265088) finish=26706.2min speed=1664K/sec

Egal wie ich speed_limit_min und speed_limit_max verändere, die Geschwindigkeit des Reshape verändert sich nicht. Die Prozessor- und Arbeitsspeicher Auslastung ist dabei die ganze Zeit gering. Hat jemand einen Tipp, wie ich die Geschwindigkeit des Reshape erhöhen kann?

LG

F

Hello friends,

I am trying to expand my RAID 5 from 3x3tb to 4x3TB, 3x4TB (that there is 3TB of unusable storage in the process is clear to me, but the 4TB disks were cheaper than the 3TB disks). I therefore used the Grow button to add the new hard drives. Unfortunately, the process is extremely slow and takes about a month. I already have

root@frederiknas:~# sysctl dev.raid.speed_limit_max

dev.raid.speed_limit_max = 5000000

and

root@frederiknas:~# sysctl dev.raid.speed_limit_min

dev.raid.speed_limit_min = 500000

cat /proc/mdstat provides

Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]

md127 : active raid5 sdj[7] sdh[6] sdg[5] sdf[4] sdb[1] sda[3] sdc[2]

5860530176 blocks super 1.2 level 5, 512k chunk, algorithm 2 [7/7] [UUUUUU]

[=>...................] reshape = 8.9% (263264660/2930265088) finish=26706.2min speed=1664K/sec

No matter how I change speed_limit_min and speed_limit_max, the reshape speed does not change. The processor and memory usage is low all the time. Does anyone have a tip on how I can increase the speed of the reshape?

LG

F

Hi there, thanks for your help! Sorry for my late reply.

chente why do you think its a bad idea? I thought a lot about the best way of using these disks and considered this as the best solution. SnapRaid does not support the size and number of disks of the raid (as far as I know). Pooling two separate raid5 would be kinda laborious and I would lose another disk of storage. Is it even possible to stop the running process without loosing data?

geaves I would be happy to reach the max speed of the disks but i don't think this is the bottleneck. In the linked thread Cyprus125 reached speeds of 16813K/sec which is about 10 times faster than mine. Do you have any ideas what could be the problem?

My backup is stored in another town and it would take me more than a day to fetch it, so I really want to avoid this.

Thanks for your help again.

LG
F

Hey thanks for your fast reply.

For the last two hours Ive been messing with stuff but could not achieve an increase of speed. I think the linked thread could work because Ive tried everything else and it seems to have worked for others but i dont dare to try, so I guess I will just wait till its done.

Regarding to snapraid i think that i misunderstood a few things......... If I visit my backups 'host' next time I will take it with me and do a snapraid.

LG

F