[SOLVED] Resilver of an HDD on Zpool very slow

[fireon]

Hello,

I have an zpool in Raid10. Works fine. I replaced a faulty disk in the past last year. Resilverd with about 300mb/s. I have 3 WD RED Pro and 3 WD Green in that pool. So i would like to change all the disk to WD RED Pro, becaue different speed and diffrent sectorsize. Ok, so i rplace one GREEN with one RED, resilver is starting, but so slow....

pool: v-machines
 state: DEGRADED
status: One or more devices is currently being resilvered.  The pool will
    continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
  scan: resilver in progress since Sat Feb 20 12:00:29 2016
    63.0G scanned out of 3.16T at 67.0M/s, 13h28m to go
    18.1G resilvered, 1.95% done
config:

    NAME                                              STATE     READ WRITE CKSUM
    v-machines                                        DEGRADED     0     0     0
     mirror-0                                        DEGRADED     0     0     0
       ata-WDC_WD2001FFSX-68JNUN0_WD-WMC5C0D0KRWP    ONLINE       0     0     0
       replacing-1                                   UNAVAIL      0     0     0
         7284561090352568349                         UNAVAIL      0     0     0  was /dev/disk/by-id/ata-WDC_WD20EARX-00ZUDB0_WD-WCC1H0343538-part1
         ata-WDC_WD2001FFSX-68JNUN0_WD-WMC5C0D0AZMA  ONLINE       0     0     0  (resilvering)
     mirror-1                                        ONLINE       0     0     0
       ata-WDC_WD2001FFSX-68JNUN0_WD-WMC5C0D688XW    ONLINE       0     0     0
       ata-WDC_WD2001FFSX-68JNUN0_WD-WMC5C0D63WM0    ONLINE       0     0     0
     mirror-2                                        ONLINE       0     0     0
       ata-WDC_WD20EARX-00ZUDB0_WD-WCC1H0381420      ONLINE       0     0     0
       ata-WDC_WD20EURS-63S48Y0_WD-WMAZA9381012      ONLINE       0     0     0

errors: No known data errors

Is this normal in my situation? It was beginning with 2mb/s. On time it goes a little bit faster. And there are 2TB disks, so why it scanned over 3.16TB

zpool list
NAME         SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
rpool       27.8G  7.77G  20.0G         -    44%    28%  1.00x  ONLINE  -
v-machines  5.44T  3.16T  2.28T         -    27%    58%  1.00x  DEGRADED  -

Thanks!

 

[fireon]

The rate has increased a bit.

scan: resilver in progress since Sat Feb 20 12:00:29 2016
        655G scanned out of 3.16T at 169M/s, 4h20m to go
        245G resilvered, 20.24% done

 

[mir]

The speed depends on how busy your pool is. The resilver job is only run when the pool has 'free time' so to speed up the process you will need to stop or delay pool intensive jobs.

 

[fireon]

There is nothing. But i think the speed is now ok for one disk 198mb/s
W/A is not high 1.3

Maybe at the begin of the process there was something... haven't looked for. But... i will look for that at the next change. HDD are ordered. They should be deliver on 3 march.

 

[fireon]

Ok, is ready:

pool: v-machines
 state: ONLINE
  scan: resilvered 1.26T in 4h52m with 0 errors on Sat Feb 20 16:52:51 2016

@mir
you were probably right.