On Mon, 24 Nov 2008, Stian Jordet wrote:
sø., 23.11.2008 kl. 17.25 -0500, skrev Justin Piszcz:
As the original posted stated:
1. please post dmesg output
2. you may want to include your kernel .config
3. xfs_info /dev/mdX or /dev/device may also be useful
4. you can also check fragmentation:
# xfs_db -c frag -f /dev/md2
actual 257492, ideal 242687, fragmentation factor 5.75%
5. something sounds very strange, I also run XFS on a lot of systems and
have never heard of that before..
6. also post your /etc/fstab options
7. what distribution are you running?
8. are -only- the two fujitsu's (raid0) affected or are other arrays
affected on this HW as well (separate disks etc)?
9. you can also compile in support for latency_top & power_top to see
if there is any excessive polling going on by any one specific
device/function as well
1 & 2: Oh, sorry I forgot to attach dmesg and config in the last mail.
root@chevrolet:~# xfs_info /dev/sdb1
meta-data=/dev/sdb1 isize=256 agcount=32,
= sectsz=512 attr=0
data = bsize=4096 blocks=365663488,
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096
log =internal bsize=4096 blocks=32768, version=1
= sectsz=512 sunit=0 blks, lazy-count=0
realtime =none extsz=4096 blocks=0, rtextents=0
root@chevrolet:~# xfs_db -c frag -f /dev/sdb1
actual 380037, ideal 373823, fragmentation factor 1.64%
6: The only mount-option is relatime, which Ubuntu adds automatically.
Hmm. I haven't tried to mount without that option. Well, didn't help
without it neither, tried just now.
7: Ubuntu 8.10 Intrepid. This is a new system, and it has never run
anything other than Intrepid. This affects both the standard kernel, and
the vanilla 126.96.36.199 that I have compiled (dmesg and config attached is
from that kernel). Have also tried both 64 bit and 32 bit (just for fun)
8: I'll explain my setup a little bit more. I explained the hardware in
my first post. But I have the two Fujitsu SAS disks in RAID-0,
with /dev/sda1 as root, and /dev/sda2 as home. Earlier they were both
xfs, and dog slow. I have now converted both to ext3, and everything is
normal. In addition I have four Seagate ST3500320AS 500GB SATA disks in
hardware RAID-5 on the same controller. This 1,5TB array is still xfs.
It also had and has the same symptoms.
9: I don't know how to do that. But what ever it is, it doesn't happen
Thanks for looking into this!
While there still may be something else wrong, the first problem I see is
your sunit and swidth are set to 0.
Please read, a good article on what they are and how to set them: