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[xfs-masters] Recovery from Accidental Hot Swap

To: xfs-masters@xxxxxxxxxxx
Subject: [xfs-masters] Recovery from Accidental Hot Swap
From: Steve Strobel <steve.strobel@xxxxxxxxxxxxx>
Date: Mon, 19 Dec 2005 15:26:39 -0700
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We have a LinkSys EFG250 NAS that uses XFS on hard drives that are 
mounted in removable carriages.  Thinking that the drives were 
hot-swappable (they apparently are not), someone unplugged the drive 
in bay 1 and plugged it back into the same spot, then removed an 
almost empty drive from bay 2 and replaced it with an almost full 
drive that had been installed there previously.  We removed both 
drives and installed them (one at a time) in a PC running Fedora Core 
4, mounting them with the command:

         mount -o norecovery,ro /dev/hdb1 /linksys

The drive from bay 1 (that was just unplugged and re-installed in the 
same bay) shows no user data;  just the directories that the LinkSys 
NAS uses.  Correspondingly, "du" shows very little disk space 
used.  "df", on the other hand, shows that the disk is almost full, 
suggesting that the original data may still be on the drive.

Similarly, the nearly full drive that was installed into bay 2 after 
the nearly empty one shows only a few empty directories in the user 
data area (the same ones that were on the nearly empty drive), "du" 
shows very little space used, and "df" shows that the disk is almost full.

Is there any chance of recovering the data on those drives?  Is 
mounting them read/write and running xfs_repair the best route to 
take?  Thanks for any suggestions.

Steve



---
Steve Strobel
Link Communications, Inc.
1035 Cerise Rd
Billings, MT 59101-7378
(406) 245-5002 ext 102
(406) 245-4889 (fax)
WWW: http://www.link-comm.com
MailTo:steve.strobel@xxxxxxxxxxxxx



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