I'm trying to create a one-off snapshot of 5.5TB of data to 3 external 2TB drives. The data is on an XFS partition, so the logical option seemed to be xfsdump, as it can span multiple devices. As a test, I've created a number of smaller partitions on one of the drives so I can force it to reach the end of the drive in minutes instead of hours. The external drive contains two partitions,
/dev/sde2, both 256MB in size.
This is the command I'm using:
xfsdump -o -l0 -s daily.0/jones -f /dev/sde2 -p 10 /snapsI'm prompted for dump and media labels and the backup begins. After around 30 seconds, I get these messages:
xfsdump: ending media file xfsdump: media file size 750000128 bytes xfsdump: dump size (non-dir files) : 728189552 bytes xfsdump: NOTE: dump interrupted: 27 seconds elapsed: may resume later using -R option xfsdump: Dump Status: INTERRUPT
That's pretty much what I was hoping to see, as it hit the end of the available space on
xfsdump -I looks good, too:
# xfsdump -I file system 0: fs id: 767465ce-3031-4672-8341-dfb135d8a463 session 0: mount point: broze:/snaps device: broze:/dev/mapper/vg0-snaps time: Tue Nov 3 14:23:57 2009 session label: "dump1" session id: 531a3622-84af-4767-a54b-a1b11a962dcb level: 0 resumed: NO subtree: YES streams: 1 stream 0: pathname: /dev/sde2 start: ino 535 offset 0 end: ino 1260 offset 0 interrupted: YES media files: 1 media file 0: mfile index: 0 mfile type: data mfile size: 750000128 mfile start: ino 535 offset 0 mfile end: ino 1260 offset 0 media label: "drive1" media id: 721c35ba-e844-47f8-8692-0d3122d88093 xfsdump: Dump Status: SUCCESS
Seems to indicate I should be able to resume the backup. However, if I run xfsdump with the
-R flag and specify a new device to backup to, this is what I get:
# xfsdump -R -o -l0 -s daily.0/jones -f /dev/sde1 -p 10 /snaps xfsdump: using file dump (drive_simple) strategy xfsdump: version 2.2.45 (dump format 3.0) - Running single-threaded ============================= dump label dialog ============================== please enter label for this dump session (timeout in 300 sec) -> dump1.contd session label entered: "dump1.contd" --------------------------------- end dialog --------------------------------- xfsdump: ERROR: resume (-R) option inappropriate: no interrupted level 0 dump to resume xfsdump: Dump Status: ERROR
/dev/sde2 partition does appear to contain a valid, if incomplete, backup as I can restore from it using the xfsrestore command.
Any idea how I can get xfsdump to span multiple devices? Is there a better way to accomplish this without manually trying to partition the data into 2TB chunks?