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Date:      Tue, 18 Dec 2001 17:07:51 -0800
From:      Shawn Ramsey <shawn@cpl.net>
To:        Dan Nelson <dnelson@allantgroup.com>
Cc:        questions@FreeBSD.ORG
Subject:   Re: Funked up filesystem
Message-ID:  <5.1.0.14.0.20011218170635.00a628c8@mail.cpl.net>
In-Reply-To: <20011218231406.GA31631@dan.emsphone.com>
References:  <5.1.0.14.0.20011218141238.02a0ee38@mail.cpl.net> <5.1.0.14.0.20011218141238.02a0ee38@mail.cpl.net>

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At 05:14 PM 12/18/2001 -0600, Dan Nelson wrote:
>In the last episode (Dec 18), Shawn Ramsey said:
> > We have an external SCSI box of disks, connected to a PCI RAID
> > adapter...  the cable connecting to the server was accidently
> > disconnected, which caused the server to crash. (which probably
> > shouldn't have happened either being on a RAID controller) But after
> > rebooting, one of the file systems in that box was real screwed up,
> > with the root directory consisting of lost+found, with directories
> > underneath being named something like
> >
> > #0142869        #0365086        #0611086
> >
> > This is the first time I've ever seen a non bad hardware related file
> > system problem... Should doing what I did have caused this? The SCSI
> > box is connected to a Mylex ExtremeRaid 1100, if it matters...
>
> >From the point of view of the server, it was bad hardware.  The drives
>suddenly disppeared :)  The problem was probably compounded by the fact
>that the OS itself didn't lose the drives; the raid controller did, so
>any cached data on the controller was lost.  That's probably why you
>ended up with messed up directories.  I've done the same thing to an
>Adaptec ASR 3200 connected to external SCSI disks.
>
>Internal RAID cards can handle a single disk failure easy enough, but
>when they all disappear at once I don't think they can recover.
>
>Moral:  Screw your scsi cables down tight.

Uh huh. :) The only reason it wasn't, was one of the SCA docks in it went 
bad a week earlier, and the cable wasn't screwed back in after it was 
replaced...



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