On 10/19/2010 01:10 AM, Dave Chinner wrote:
Understand your numbers. What frag reports is how many extents there
are vs a perfect layout. It does not tell you how badly fragmented
your filesystem is. Extent-based filesystems can have
"fragmentation" like you see reported above, but not suffer at all
because the extents are large enough not to affect IO throughput.
I think I almost got that now.
But, at which numbers should I look at before starting a defrag then?
Up to now, I ran always "echo frag | xfs_db -r /dev/..." to get a
"number" that could tell me if starting a xfs_fsr was necessary.
At which other numbers should I look at to see if running a xfs_fsr
defrag is necessary or not?
Richard Ems mail: Richard.Ems@xxxxxxxxxxxxxxxxx
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