Re: Dual disk RAID 5 failure!

Re: Dual disk RAID 5 failure!

[David Greaves]

certainly cc the guys on linux-raid - a *great* bunch :)

you'll need more detail on your config though - have you got mdadm 
installed?

mdadm --detail /dev/md0

any log output?

David

Chris Birkinshaw wrote:

>
>
> Hi,
>
> Last night one of my drives got corrupted during a crash, but also 
> corrupted the other drive on that controller (I know I should only 
> have one drive per controller but you know how it is.... stable door 
> and all that).
>
> So I now have 2 disks missing from my RAID 5 with corrupt superblocks. 
> Is there any way to get back from this, there was around 400Gb of data 
> on there....
>
> If anyone has any idea at all that may help I would be very happy to 
> hear it,
>
> Many thanks,
>
> Chris
>
>



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Re: Dual disk RAID 5 failure!

[Chris Birkinshaw]

Thanks for the quick response!

mdadm --detail /dev/md0 gives:


/dev/md0:
         Version : 00.90.01
   Creation Time : Mon Aug 11 16:21:07 2003
      Raid Level : raid5
     Device Size : 58612992 (55.90 GiB 60.02 GB)
    Raid Devices : 7
   Total Devices : 5
Preferred Minor : 0
     Persistence : Superblock is persistent

     Update Time : Thu Nov 25 17:03:19 2004
           State : dirty, degraded
  Active Devices : 5
Working Devices : 5
  Failed Devices : 0
   Spare Devices : 0

          Layout : left-asymmetric
      Chunk Size : 128K

     Number   Major   Minor   RaidDevice State
        0       0        0       -1      removed
        1       0        0       -1      removed
        2     253       25        2      active sync   
/dev/evms/.nodes/hdg1
        3     253       26        3      active sync   
/dev/evms/.nodes/hdh1
        4     253       27        4      active sync   
/dev/evms/.nodes/hdi1
        5     253       24        5      active sync   
/dev/evms/.nodes/hde_bbr3
        6     253       22        6      active sync   
/dev/evms/.nodes/hdb1
            UUID : aee7cfe5:90afb264:d1f855a1:f7a6b30e
          Events : 0.10035809




On 25 Nov 2004, at 19:31, David Greaves wrote:

> certainly cc the guys on linux-raid - a *great* bunch :)
>
> you'll need more detail on your config though - have you got mdadm 
> installed?
>
> mdadm --detail /dev/md0
>
> any log output?
>
> David
>
> Chris Birkinshaw wrote:
>
>>
>>
>> Hi,
>>
>> Last night one of my drives got corrupted during a crash, but also 
>> corrupted the other drive on that controller (I know I should only 
>> have one drive per controller but you know how it is.... stable door 
>> and all that).
>>
>> So I now have 2 disks missing from my RAID 5 with corrupt 
>> superblocks. Is there any way to get back from this, there was around 
>> 400Gb of data on there....
>>
>> If anyone has any idea at all that may help I would be very happy to 
>> hear it,
>>
>> Many thanks,
>>
>> Chris
>>
>>



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Re: Dual disk RAID 5 failure!

[Neil Brown]

On Thursday November 25, chris@postbox.org.uk wrote:
> >> Hi,
> >>
> >> Last night one of my drives got corrupted during a crash, but also 
> >> corrupted the other drive on that controller (I know I should only 
> >> have one drive per controller but you know how it is.... stable door 
> >> and all that).
> >>
> >> So I now have 2 disks missing from my RAID 5 with corrupt 
> >> superblocks. Is there any way to get back from this, there was around 
> >> 400Gb of data on there....
> >>
> >> If anyone has any idea at all that may help I would be very happy to 
> >> hear it,

Have you tried:
   mdadm --assemble --force /dev/mdWHATEVER /dev/list-of-devices-that-contain-the-array

??

NeilBrown


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