Is there any tool to tell how many files have how many fragments out of
how many files...something on the order of
the following files have more than 1 fragment:
frags file
2 /tmp/xyzzy
35 /var/mail/box
...
37 objects out of 1000 total, >1 fragment: 3.7% fragmented objects
1100 fragments total, 10% fragmented file space (1000 optimal
fragments)
[are xfs allocates are done in "zones"? so similar files in same
directory
are usually near each other on disk?] Does it make sense to talk about
'free space fragmentation'?
For example,
on a 'start from beginning' FS like FAT32, optimal may be 1 large area
of free space, except for an extra segment or so after frequently-
modified-files, but if a disk was, in some way zoned, optimal might
be 100 areas of freespace]
110 free space fragments (50 optimal) 55% fragmention.
Does xfs_fsr defrag freespace as well? Any idea on how much
fragmentation
affects performance on xfs? Is it on the same order that it is on FAT32
or
NTFS? I've read (perhaps it was defrat company propaganda), that while
FAT
could be defragemented on an occasional, as needed basis, NTFS needed
more
aggressive fragmentation -- so much so that an auto defragger in
background
could be useful in some circumstances.
I've tended to think of *nix fs's as not usually needing defragmenting
if
they were kept below 90% capacity, I think xfs's defragmenter is the
first I've
heard of on a *nix.
Order on disk correlated to execution order after boot can affect boot
performance on WindowsXP by over 100%. Have there been any measurements
on block ordering with xfs (or any *nix fs's for that matter)...
-linda
> -----Original Message-----
> From: linux-xfs-bounce@xxxxxxxxxxx
> [mailto:linux-xfs-bounce@xxxxxxxxxxx] On Behalf Of Chris Wedgwood
> Sent: Saturday, November 02, 2002 3:04 PM
> To: mgiesbre
> Cc: linux-xfs@xxxxxxxxxxx
> Subject: Re: Defrag Utility
>
>
> On Thu, Nov 02, 2000 at 05:06:02PM -0600, mgiesbre wrote:
>
> > I was wondering if there was any work being done on an XFS defrag
> > utility, like the command that is available in IRIX. Any info?
>
> man xfs_fsr
>
>
> --cw
>
>
>
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