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Re: Problem with data recovery

To: xfs@xxxxxxxxxxx
Subject: Re: Problem with data recovery
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Sun, 18 Oct 2015 18:12:19 -0500
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In-reply-to: <20151018144937.5406805.67472.2273@xxxxxxxxx>
References: <20151018144937.5406805.67472.2273@xxxxxxxxx>
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On 10/18/15 9:49 AM, Matteo Sarti wrote:
> I have a buffalo terastation with both two failed drive on 4 drives of raid 5.
> Problem is very simple hardware is ok, but someone goes wrong during normal 
> process of this dataserver.

I don't understand what that means - how can you have two failed drives, but 
hardware is ok?

If you lost 2 drives out of a 3+1 RAID5, then you have essentially lost your 
filesystem,
I'm sorry.

> I check both driver on other PC with ufs explorer and drive is full of data, 
> but xfs file system is not recognized.

because the drives are part of a raid set, and they are not xfs filesystems
on their own.

https://en.wikipedia.org/wiki/Standard_RAID_levels#RAID_5

> How can I write manually on harddrive using raw data the beginning of xfs 
> definition??

You can't.

> I hope someone can help me because buffalo is very good in selling, but not 
> so much in Support :(.

If you lost 2 of your 4 drives, there's not much support to do, I'm afraid.

-Eric

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