Re: Server down-fail​ed RAID5-asking for some assistance

[John Valarti <mdadmuser@gmail.com>]

On Sat, Apr 23, 2011 at 3:51 PM, NeilBrown <neilb@suse.de> wrote:
> On Sat, 23 Apr 2011 10:19:31 -0600 John Valarti <mdadmuser@gmail.com> wrote:
>
>> On Sat, Apr 23, 2011 at 2:48 AM, NeilBrown <neilb@suse.de> wrote:
>> >> No luck
>> >> Same thing:
>> >> "no devices found.."
>> >
>> > I'm sure it said more than just that.  Complete error messages really are
>> > helpful..
>> >
>> > But the implication seems to be that /dev/sd[acd] don't exist... That is
>> > weird.
>> > What does "cat /proc/partitions" show?
>> > If e.g.  sda is there but sda2 is not, does "blockdev --rereadpt /dev/sda"
>> > help?
>> >
>> > NeilBrown
>>
>> They exist.
>> I have physically removed the dead drive, so now the 3 remaining ones
>> are at sd[abc]
>> I have a usb thumb drive plugged in to capture outputs as needed, it is sdd.
>> blockdev does not seem to exist on this system.
>>
>> If useful I now have some more of the same 250GB drives, and I can
>> plug one in to the sdb port and make partitions on it, and so on..
>>
>> For example fdisk -l shows all my partitions. I also show the output
>> you asked for proc/partitions:
>>
>> Disk /dev/sda: 251.0 GB, 251000193024 bytes
>> 255 heads, 63 sectors/track, 30515 cylinders
>> Units = cylinders of 16065 * 512 = 8225280 bytes
>>
>>    Device Boot      Start         End      Blocks   Id  System
>> /dev/sda1   *           1          17      136521   fd  Linux raid autodetect
>> /dev/sda2              18       30515   244975185   fd  Linux raid autodetect
>>
>> Disk /dev/sdb: 251.0 GB, 251000193024 bytes
>> 255 heads, 63 sectors/track, 30515 cylinders
>> Units = cylinders of 16065 * 512 = 8225280 bytes
>>
>>    Device Boot      Start         End      Blocks   Id  System
>> /dev/sdb1   *           1          17      136521   fd  Linux raid autodetect
>> /dev/sdb2              18       30515   244975185   fd  Linux raid autodetect
>>
>> Disk /dev/sdc: 251.0 GB, 251000193024 bytes
>> 255 heads, 63 sectors/track, 30515 cylinders
>> Units = cylinders of 16065 * 512 = 8225280 bytes
>>
>>    Device Boot      Start         End      Blocks   Id  System
>> /dev/sdc1   *           1          17      136521   fd  Linux raid autodetect
>> /dev/sdc2              18       30515   244975185   fd  Linux raid autodetect
>>
>> Disk /dev/sdd: 1039 MB, 1039663104 bytes
>> 255 heads, 63 sectors/track, 126 cylinders
>> Units = cylinders of 16065 * 512 = 8225280 bytes
>>
>>    Device Boot      Start         End      Blocks   Id  System
>> /dev/sdd1   *           1         127     1015264+   c  W95 FAT32 (LBA)
>> Partition 1 has different physical/logical endings:
>>      phys=(125, 254, 63) logical=(126, 101, 39)
>> ===================================
>> major minor  #blocks  name
>>
>>    7     0     111000 loop0
>>    8     0  245117376 sda
>>    8     1     136521 sda1
>>    8     2  244975185 sda2
>>    8    16  245117376 sdb
>>    8    17     136521 sdb1
>>    8    18  244975185 sdb2
>>    8    32  245117376 sdc
>>    8    33     136521 sdc1
>>    8    34  244975185 sdc2
>>    8    48    1015296 sdd
>>    8    49    1015264 sdd1
>>
>> --
>> John
>
>
> I really cannot help you until you show me the output of "mdadm --assemble
> --verbose ..." like I asked.
>
> NeilBrown
>

I really WAS NOT lying!

I just did it again, and redirected output to a file

The file ( located on my USB stick) contains:

mdadm: looking for devices for /dev/md1
mdadm: no devices found for /dev/md1

--
John
--
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