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RAID resync?

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  • 01-03-2009 2:18am
    #1
    Orion
    Closed Accounts Posts: 12,807 ✭✭✭✭


    PC was running a bit slow tonight so I did a top to see what the bottleneck was:
    PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
 2401 root      15  -5     0    0    0 S   23  0.0   1:43.90 md2_raid1          
22294 root      15  -5     0    0    0 D    3  0.0   0:10.18 md2_resync

    Haven't seen that one before so let's check mdstat:
    ~$ cat /proc/mdstat 
md2 : active raid1 sda3[0] sdb3[1]
      720852544 blocks [2/2] [UU]
      [=>...................]  check =  5.3% (38769408/720852544) finish=175.0min speed=64920K/sec
      
md1 : active raid1 sda2[0] sdb2[1]
      3903680 blocks [2/2] [UU]
      	resync=DELAYED
      
md0 : active raid1 sda1[0] sdb1[1]
      7815488 blocks [2/2] [UU]

    So it's doing a resync - but why? Is this a normal thing or should I be concerned that a disk is failing?


Comments

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    #2
    francosp
    Registered Users Posts: 355 ✭✭francosp


    if possible run a dtrace


  • Options
    #3
    leeroybrown
    Closed Accounts Posts: 7,563 ✭✭✭leeroybrown


    It's nothing to worry about. It's a cronjob that's set to run a 'checkarray' on the arrays periodically. Have a look in /etc/cron.d/ and there should be an 'mdadm' script that runs it. If you're using Ubuntu it kicks off at 01:06 on Sunday (20 mins ago).


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    #4
    djmarkus
    Registered Users Posts: 1,606 ✭✭✭djmarkus


    francosp wrote: »
    if possible run a dtrace
    i assume you wer taking the piss here?

    If not you realise that he/she is running linux, and dtrace isnt in linux?


    Anyway RAID resync's arent a big deal. You will see a performance decrease for the duration though.


  • Options
    #5
    Orion
    Closed Accounts Posts: 12,807 ✭✭✭✭Orion


    leeroybrown wrote: »
    It's nothing to worry about. It's a cronjob that's set to run a 'checkarray' on the arrays periodically. Have a look in /etc/cron.d/ and there should be an 'mdadm' script that runs it. If you're using Ubuntu it kicks off at 01:06 on Sunday (20 mins ago).

    That exactly what it was - thanks. It's set to run at 00:57 on the first Sunday of the month.

    Panic averted :pac:


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