Hi, Kevin,
ext4 appears, so far, to be a food fit for our gluster services. That's
all we've looked at it for, and for that matter, we're still using XFS
on our gluster system for the HPC instance.
XFS has proven sensitive to loss of a RAID shelf, or loss of a
particular drive or two on a shelf, in our world when we were using LVM2
to create larger volumes. That can cause a lot of problems all of a
sudden. When a hardware failure happens and XFS goes offline, an
xfs-recovery operation often requires loss of data when the XFS log is
blown away, which you shouldn't HAVE to do, but, in our experience, is
required about 2/3d of the time.
That said, if we never had hardware failures, XFS would be just about
perfect...
gc
Kevin R. Tyle wrote:
Hi Gerry, et al.:
Any sense as to whether ext4 is improved enough to warrant its use in
lieu of a non-journaling fs such as ext2?
Also, what particular problems are of concern with XFS?
--Kevin
______________________________________________________________________
Kevin Tyle, Systems Administrator **********************
Dept. of Atmospheric & Environmental Sciences ktyle@xxxxxxxxxxxxxxxx
University at Albany, ES-235 518-442-4578 (voice)
1400 Washington Avenue 518-442-5825 (fax)
Albany, NY 12222 **********************
______________________________________________________________________
On 10/25/2010 08:43 PM, Gerald Creager wrote:
I have not, but with the amount of disk we run, we've gone far away
from ext3. We have XFS for our NFS partitions, and ext4 for our
Gluster. There are a whole lot of problems associated with ext3, in
cluding but not limited to how long it takes to do one of its periodic
checks when you've exceed the time limit or reboot count.
gerry
Arthur A. Person wrote:
Has anyone tried mounting ext3 with the data=writeback option (with
the risk that active data files could be corrupt after a crash)? I'm
wondering how close performance would come to ext2...
Art
On Mon, 25 Oct 2010, Gerald Creager wrote:
The choices for files of this size are ext2 if you don't care about
journaling, or XFS. XFS has its own share of problems but does work
very well.
gerry
Tyler Allison wrote:
We switched off of ext3 for our data partitions for high speed IO.
It blows chunks compared to ext2. You loose journaling but I don't
care. I don't have long term storage.
Sent from my iPhone
On Oct 25, 2010, at 3:10 PM, "Jeff Lake - Admin"
<admin@xxxxxxxxxxxxxxxxxxxx> wrote:
yep both 7200 SATA2's
was considering a Velociraptor 10K RPM but at the xtra $60/m ....
need to really consider long and hard
Jeff,
If your disk RPM isn't at least 7200, your I/O is going to be bad
with Level2/3 feeds.
*******************************************************************************
Gilbert Sebenste ********
(My opinions only!) ******
Staff Meteorologist, Northern Illinois University ****
E-mail: sebenste@xxxxxxxxxxxxxxxxxxxxx ***
web:
http://weather.admin.niu.edu **
*******************************************************************************
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