[CentOS] Re: Trying to recover data off SATA-to-SCSI external 2TBARRAY

Scott Silva ssilva at sgvwater.com
Mon Oct 15 21:14:51 UTC 2007

on 10/15/2007 12:42 PM Dan Carl spake the following:
> On Monday 15 October 2007, John R Pierce wrote:
>> Peter Kjellstrom wrote:
>>> On Monday 15 October 2007, Dan Carl wrote:
>>> ...
>>>> But with errors
>>>>  In dmesg have this:
>>>> sda: Mode Sense: bf 00 00 08
>>>> SCSI device sda: drive cache: write back
>>>> sda: unknown partition table
>>>> sd 0:0:0:0: Attached scsi disk sda
> ...
>>> Try "mount -oro /dev/sda /mnt/tmp" (or whatever) or just see if there's
> a
>>> superblock there with "tune2fs -l /dev/sda".
>> he has a hardware raid set of drives originally from a HP/Compaq
>> SmartArray controller, now connected to a simple non-raid scsi
>> controller.   sorry, thats not gonna play no way no how.
>> Since he only mentioned one device on his centos, there are centainly
>> plausible ways this could work. The original cciss array could have been a
>> single drive, could have been a raid1, could have been a misunderstood
> hwraid
>> just tunneled through the host adapter as a single driver, etc.
> .
> The SmartArray doesn't recognize the external array.
> So thats why I connected it to a SCSI non-raid controller which does.
> lvndiskscan on my Centos server even can tell the size of it.
> /dev/sda                 [        2.00 TB]
> The external array has it's own built in raid controller.
> The Bios the SmartArray said it was a raid 0 2048GB failed.
> I not sure why the SmartArray sees it as that because the external array is
> configured as a raid 5 with spares.
> Im not familar with the SmartArray and don't have another to try.
> Is there no way to access the data other than via the SmartArray?
The smartarray sees it as a raid0 with one drive because that is how its bios 
works. If you attached a single scsi drive to it, you could set it as a single 
drive and it would show up as a raid0 stripe with one drive.

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