* directory defrag
@ 2015-04-14 7:37 Russell Coker
2015-04-14 8:03 ` Sander
2015-04-14 12:53 ` David Sterba
0 siblings, 2 replies; 3+ messages in thread
From: Russell Coker @ 2015-04-14 7:37 UTC (permalink / raw)
To: linux-btrfs
The current defragmentation options seem to only support defragmenting named
files/directories or a recursive defragmentation of files and directories.
I'd like to recursively defragment directories. One of my systems has a large
number of large files, the files are write-once and read performance is good
enough. However performance of "ls -al" is often very poor, presumably due to
metadata fragmentation.
The other thing I'd still like is the ability to force all metadata allocation
to be from specified disks. I'd like to have a pair of SSDs for RAID-1 storage
of metadata and a set of hard drives for RAID-1 storage of data.
--
My Main Blog http://etbe.coker.com.au/
My Documents Blog http://doc.coker.com.au/
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: directory defrag
2015-04-14 7:37 directory defrag Russell Coker
@ 2015-04-14 8:03 ` Sander
2015-04-14 12:53 ` David Sterba
1 sibling, 0 replies; 3+ messages in thread
From: Sander @ 2015-04-14 8:03 UTC (permalink / raw)
To: Russell Coker; +Cc: linux-btrfs
Russell Coker wrote (ao):
> The current defragmentation options seem to only support defragmenting
> named files/directories or a recursive defragmentation of files and
> directories.
>
> I'd like to recursively defragment directories.
find / -xdev -type d -execdir btrfs filesystem defrag -c {} +
Would that work for you?
Sander
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: directory defrag
2015-04-14 7:37 directory defrag Russell Coker
2015-04-14 8:03 ` Sander
@ 2015-04-14 12:53 ` David Sterba
1 sibling, 0 replies; 3+ messages in thread
From: David Sterba @ 2015-04-14 12:53 UTC (permalink / raw)
To: Russell Coker; +Cc: linux-btrfs
On Tue, Apr 14, 2015 at 07:37:17AM +0000, Russell Coker wrote:
> The current defragmentation options seem to only support defragmenting named
> files/directories or a recursive defragmentation of files and directories.
>
> I'd like to recursively defragment directories. One of my systems has a large
> number of large files, the files are write-once and read performance is good
> enough. However performance of "ls -al" is often very poor, presumably due to
> metadata fragmentation.
Ie. the directory metadata in the b-tree. That's possible, but not all
of the code is there. So fare only whole-tree defragmentation is
implemented, ie. the extent tree or any subvolume tree. We'd have to
extend the defrag api to take a key range and then use it to span the
directory key range.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2015-04-14 7:37 directory defrag Russell Coker
2015-04-14 8:03 ` Sander
2015-04-14 12:53 ` David Sterba
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