On 03/25/2016 02:00 PM, Jan Schermer wrote:
V5 is supposedly stable, but that only means it will be just as bad as any other XFS.
I recommend avoiding XFS whenever possible. Ext4 works perfectly and I never lost any data with it, even when it got corrupted, while XFS still likes to eat the data when something goes wrong (and it will, like when you hit bit rot or a data cable fails).
Jan
Strangely enough, your observation is not in sync with what most of the world
sees with xfs.
XFS is quite stable, used routinely (and by default now in RHEL) and performs
quite well. If you have specific issues with a file system, please do raise bugs
on the appropriate mailing list.
ext4 is a good file system, nothing wrong with it, but some of the features
(lazy allocation, etc) exist in both ext4 and xfs these days. If you use
applications that don't know how to use fsync() properly, both ext4 and xfs will
behave in a similar fashion if the power goes out.
Regards,
Ric
On 25. 3. 2016, at 11:44, Dzianis Kahanovich <mahatma@xxxxxxxxxxxxxx> wrote:
Before adding/replacing new OSDs:
What version of xfs is preferred by ceph developers/testers now?
Time ago I move all to v5 (crc=1,finobt=1), it works, exclude
"logbsize=256k,logbufs=8" in 4.4. Now I see, v5 is default mode (xfsprogs &
kernel 4.5 at least).
I in doubts: make new OSDs old-style v4 + logbsize=256k,logbufs=8 (and remove v5
crc worloads) - increase linear performance (exclude rm/ls operations), or make
current default v5 to other benefits.
Are xfs v4 still mainstream for ceph?
PS I use too fresh "unstable" Gentoo ~amd64, so don't know some normal distros
reality...
--
WBR, Dzianis Kahanovich AKA Denis Kaganovich, http://mahatma.bspu.unibel.by/
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