[BlueOnyx:07866] Re: Disk failure and working out exactly which disk

[Richard Morgan]

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)

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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