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Message-ID: <48B6BD02.3080307@redhat.com>
Date: Thu, 28 Aug 2008 09:58:10 -0500
From: Eric Sandeen <sandeen@...hat.com>
To: ext4 development <linux-ext4@...r.kernel.org>
CC: Ric Wheeler <rwheeler@...hat.com>
Subject: Do we need dump for ext4?
I was talking to Ric about dump benchmarks, and he was of the impression
that dump may not be used that often anymore, at least in the
enterprise. (Ric, hope I'm paraphrasing correctly)
Undaunted :) I ran off and tested an artificial backup scenario:
* Untar a kernel tree into 128 different top level dirs
* Make a level 0 backup
* Untar a kernel tree into 128 MORE different top level dirs
* Make a level 1 backup
128 kernel trees uses about 6.5M inodes, and about 80G of space.
I tested ext3 with dump; ext4 with tar, and xfs with xfsdump.
for ext3:
dump -1 -u -f $DUMPDIR/dump1 $DATADIR
for ext4:
tar --atime-preserve --xattr --after-date=$DUMPDIR/dump0.tar -cf
$DUMPDIR/dump1.tar $DATADIR
for xfs:
xfsdump -F -l 1 -f $DUMPDIR/dump0 $DATADIR
DUMPDIR and DATADIR were 2 partitions on the same (fast hardware) lun.
Results:
level0 level1
------ ------
ext3 38m52s 42m21s
ext4 57m55s 69m35s
xfs 25m18s 37m44s
Clearly tar on ext4, at least for my incantation, lags. Is dump for
ext4 anywhere on the todo list, or should it be? Or am I just running
tar wrong? :)
-Eric
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