xfsrestore performance

[xfs.pkoch at dfgh.net]

Dear XFS experts,

I checked the situation this morning:

....
xfsdump: status at 10:25:53: 473543/7886560 files dumped, 1.3% data dumped,
76211 seconds elapsed
xfsdump: status at 10:35:46: 478508/7886560 files dumped, 1.3% data dumped,
76804 seconds elapsed

and decided to stop the process. With this kind of speed xfsdump |
xfsrestore
will need more than one month. Something must be seriously wrong here.

I see two options: Use rsync again to copy the data from the 14TB xfs
filesystem to the new 20TB xfs filesystem. This won't be finished
this weekend.

Or use dd to copy the 14TB XFS filesystem into the 20TB volume and
then grow the filesystem.

dd runs at 300MB/sec that's approx 1TB per hour, so I decided to go this
way.

So here's another question: The new filesystem will run on a 20 disk raid10
volume and was copied from a 16 disk raid5 volume. So swidth will be wrong.
Also all the data will be within the first 15TB.

What should I do to fix this? Or will xfs_growfs fix it automatically?

Regards

Peter Koch
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