hello all,
i have been testing gluster as a central file server for a small animation
studio/post production company. my initial experiments were using the fuse
glusterfs protocol - but that ran extremely slowly for home dirs and general
file sharing. we have since switched to using NFS over glusterfs. NFS
has certainly seemed more responsive re. stat and dir traversal. however,
i'm now being plagued with three different types of errors:
1/ Stale NFS file handle
2/ input/output errors
3/ and a new one:
$ l -l /n/auto/gv1/production/conan/hda/published/OLD/
ls: cannot access /n/auto/gv1/production/conan/hda/published/OLD/shot:
Remote I/O error
total 0
d????????? ? ? ? ? ? shot
...so it's a bit all over the place. i've tried rebooting both servers and
clients. these issues are very erratic - they come and go.
some information on my setup: glusterfs 3.1.2
g1:~ # gluster volume info
Volume Name: glustervol1
Type: Distributed-Replicate
Status: Started
Number of Bricks: 4 x 2 = 8
Transport-type: tcp
Bricks:
Brick1: g1:/mnt/glus1
Brick2: g2:/mnt/glus1
Brick3: g3:/mnt/glus1
Brick4: g4:/mnt/glus1
Brick5: g1:/mnt/glus2
Brick6: g2:/mnt/glus2
Brick7: g3:/mnt/glus2
Brick8: g4:/mnt/glus2
Options Reconfigured:
performance.write-behind-window-size: 1mb
performance.cache-size: 1gb
performance.stat-prefetch: 1
network.ping-timeout: 20
diagnostics.latency-measurement: off
diagnostics.dump-fd-stats: on
that is 4 servers - serving ~30 clients - 95% linux, 5% mac. all NFS.
other points:
- i'm automounting using NFS via autofs (with ldap). ie:
gus:/glustervol1 on /n/auto/gv1 type nfs
(rw,vers=3,rsize=32768,wsize=32768,intr,sloppy,addr=10.0.0.13)
gus is pointing to rr dns machines (g1,g2,g3,g4). that all seems to be
working.
- backend files system on g[1-4] is xfs. ie,
g1:/var/log/glusterfs # xfs_info /mnt/glus1
meta-data=/dev/sdb1 isize=256 agcount=7, agsize=268435200
blks
= sectsz=512 attr=2
data = bsize=4096 blocks=1627196928, imaxpct=5
= sunit=256 swidth=2560 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal bsize=4096 blocks=32768, version=2
= sectsz=512 sunit=8 blks, lazy-count=0
realtime =none extsz=4096 blocks=0, rtextents=0
- sometimes root can stat/read the file in question while the user cannot!
i can remount the same NFS share to another mount point - and i can then
see that with the same user.
- sample output of g1 nfs.log file:
[2011-02-18 15:27:07.201433] I [io-stats.c:338:io_stats_dump_fd]
glustervol1: Filename :
/production/conan/hda/published/shot/backup/.svn/tmp/entries
[2011-02-18 15:27:07.201445] I [io-stats.c:353:io_stats_dump_fd]
glustervol1: BytesWritten : 1414 bytes
[2011-02-18 15:27:07.201455] I [io-stats.c:365:io_stats_dump_fd]
glustervol1: Write 001024b+ : 1
[2011-02-18 15:27:07.205999] I [io-stats.c:333:io_stats_dump_fd]
glustervol1: --- fd stats ---
[2011-02-18 15:27:07.206032] I [io-stats.c:338:io_stats_dump_fd]
glustervol1: Filename :
/production/conan/hda/published/shot/backup/.svn/props/tempfile.tmp
[2011-02-18 15:27:07.210799] I [io-stats.c:333:io_stats_dump_fd]
glustervol1: --- fd stats ---
[2011-02-18 15:27:07.210824] I [io-stats.c:338:io_stats_dump_fd]
glustervol1: Filename :
/production/conan/hda/published/shot/backup/.svn/tmp/log
[2011-02-18 15:27:07.211904] I [io-stats.c:333:io_stats_dump_fd]
glustervol1: --- fd stats ---
[2011-02-18 15:27:07.211928] I [io-stats.c:338:io_stats_dump_fd]
glustervol1: Filename :
/prod_data/xmas/lgl/pic/mr_all_PBR_HIGHNO_DF/035/1920x1080/mr_all_PBR_HIGHNO_DF.6084.exr
[2011-02-18 15:27:07.211940] I [io-stats.c:343:io_stats_dump_fd]
glustervol1: Lifetime : 8731secs, 610796usecs
[2011-02-18 15:27:07.211951] I [io-stats.c:353:io_stats_dump_fd]
glustervol1: BytesWritten : 2321370 bytes
[2011-02-18 15:27:07.211962] I [io-stats.c:365:io_stats_dump_fd]
glustervol1: Write 000512b+ : 1
[2011-02-18 15:27:07.211972] I [io-stats.c:365:io_stats_dump_fd]
glustervol1: Write 002048b+ : 1
[2011-02-18 15:27:07.211983] I [io-stats.c:365:io_stats_dump_fd]
glustervol1: Write 004096b+ : 4
[2011-02-18 15:27:07.212009] I [io-stats.c:365:io_stats_dump_fd]
glustervol1: Write 008192b+ : 4
[2011-02-18 15:27:07.212019] I [io-stats.c:365:io_stats_dump_fd]
glustervol1: Write 016384b+ : 20
[2011-02-18 15:27:07.212030] I [io-stats.c:365:io_stats_dump_fd]
glustervol1: Write 032768b+ : 54
[2011-02-18 15:27:07.228051] I [io-stats.c:333:io_stats_dump_fd]
glustervol1: --- fd stats ---
[2011-02-18 15:27:07.228078] I [io-stats.c:338:io_stats_dump_fd]
glustervol1: Filename :
/production/conan/hda/published/shot/backup/.svn/tmp/entries
...so, the files not working don't have lifetime, read/written lines after
their log entry.
all very perplexing - and scary. one thing that reliably fails is using svn
working dirs on the gluster filesystem. nfs locks keep being dropped. this
is temporarily fixed when i view the file as root (on a client) - but then
re-appears very quickly. i assume that gluster is upto something as simple
as having svn working dirs?
i'm hoping i've done something stupid which is easily fixed. we seem so
close - but right now, i'm at a loss and loosing confidence. i would
greatly appreciate any help/pointers out there.
regards,
paul
