[BlueOnyx:07868] Re: Disk failure and working out exactly which disk

[Gerald Waugh]

Richard Morgan wrote:
> Fantastic, thanks Jeff - exactly the info I was looking for... it is sdb 
> failing.
> 
> I'm somewhat interested by the 'removed' status - maybe it's just something 
> assigned to the failed disk.  In otherwords why are there now three entries? 
> Google, here I come :o)

Removed from the RAID array

> Anyway, your help has been greatly appreciated.  I will post back if it 
> automatically rebuilds - I believe it should and in the past my test server 
> always has.
> 
> Richard
> 
> 
> ----- Original Message ----- 
> From: "Jeff Folk" <jfolk at qzoneinc.com>
> To: "BlueOnyx General Mailing List" <blueonyx at mail.blueonyx.it>
> Sent: Wednesday, July 27, 2011 2:31 PM
> Subject: [BlueOnyx:07865] Re: Disk failure and working out exactly which 
> disk
> 
> 
>> On Jul 27, 2011, at 7:17 AM, Richard Morgan wrote:
>>> Hi... hope someone can help as I'm a bit stuck.
>>>
>>> We've got a BX server with software RAID and it's reporting a single disk 
>>> failure both in the GUI and with the following:
>>>
>>> [admin at s1 ~]$ cat /proc/mdstat
>>>
>>> Personalities : [raid1]
>>>
>>> md0 : active raid1 sdb1[2](F) sda1[0]
>>>
>>>       256896 blocks [2/1] [U_]
>>>
>>>
>>> md1 : active raid1 sdb2[2](F) sda2[0]
>>>
>>>       976502912 blocks [2/1] [U_]
>>>
>>> unused devices: <none>
>>>
>>> The guys in the data centre are great and will change a disk for me, but 
>>> I need to know if it's SATA0 or SATA1 for the controller.
>>>
>>> What is the command to work this out?  U_ implies 0 is fine, but 1 is 
>>> failing - howover I don't want to assume anything.
>>>
>>> Many thanks indeed.
>>>
>>> Richard
>> sdb1 is flagged as failed here with "(F)" -- md0 : active raid1 sdb1[2](F) 
>> sda1[0]
>>                                                                        ^
>> sda is usually the first SATA port, sdb the second, etc...
>>
>> You can also type (as root):
>>
>> mdadm --detail /dev/md0
>>
>> to see the detail. At the bottom of the output will be a drive list for 
>> your array showing components and status (this is from my RAID5 array):
>>
>>    Number   Major   Minor   RaidDevice State
>>       0       8        1        0      active sync   /dev/sda1
>>       1       8       17        1      active sync   /dev/sdb1
>>       2       8       33        2      active sync   /dev/sdc1
>>
>> Where one of the drives will be listed as NOT "active sync"
>>
>> I'm really curious as to whether BlueOnyx will automatically rebuild the 
>> array when the drive is replaced, or if some manual wrangling with mdadm 
>> commands will be required... And yours is a simple RAID 1. I'm wondering 
>> if I did the right thing by using RAID 1+0? I'm thinking that maybe I 
>> should have used RAID 5 with one spare disk on my 4 disk setup. Well... 
>> I'm crossing my fingers that I don't have to deal with it, and that the 
>> Scientific Linux based BO is quickly forthcomong. Wordpress users are 
>> stuck in upgrades until we can have a more recent version of php.
>>
>> Regards;
>> Jeff
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>> Blueonyx at mail.blueonyx.it
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> 
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-- 
Gerald