More info:
All filesystems mounted using noatime,nodiratime,noquota.
All filesystems report the same data from gfs_tool gettune:
limit1 = 100
ilimit1_tries = 3
ilimit1_min = 1
ilimit2 = 500
ilimit2_tries = 10
ilimit2_min = 3
demote_secs = 300
incore_log_blocks = 1024
jindex_refresh_secs = 60
depend_secs = 60
scand_secs = 5
recoverd_secs = 60
logd_secs = 1
quotad_secs = 5
inoded_secs = 15
glock_purge = 0
quota_simul_sync = 64
quota_warn_period = 10
atime_quantum = 3600
quota_quantum = 60
quota_scale = 1.0000 (1, 1)
quota_enforce = 0
quota_account = 0
new_files_jdata = 0
new_files_directio = 0
max_atomic_write = 4194304
max_readahead = 262144
lockdump_size = 131072
stall_secs = 600
complain_secs = 10
reclaim_limit = 5000
entries_per_readdir = 32
prefetch_secs = 10
statfs_slots = 64
max_mhc = 10000
greedy_default = 100
greedy_quantum = 25
greedy_max = 250
rgrp_try_threshold = 100
statfs_fast = 0
seq_readahead = 0
And data on the FS from gfs_tool counters:
locks 2948
locks held 1352
freeze count 0
incore inodes 1347
metadata buffers 0
unlinked inodes 0
quota IDs 0
incore log buffers 0
log space used 0.05%
meta header cache entries 0
glock dependencies 0
glocks on reclaim list 0
log wraps 2
outstanding LM calls 0
outstanding BIO calls 0
fh2dentry misses 0
glocks reclaimed 223287
glock nq calls 1812286
glock dq calls 1810926
glock prefetch calls 101158
lm_lock calls 198294
lm_unlock calls 142643
lm callbacks 341621
address operations 502691
dentry operations 395330
export operations 0
file operations 199243
inode operations 984276
super operations 1727082
vm operations 0
block I/O reads 520531
block I/O writes 130315
locks 171423
locks held 85717
freeze count 0
incore inodes 85376
metadata buffers 1474
unlinked inodes 0
quota IDs 0
incore log buffers 24
log space used 0.83%
meta header cache entries 6621
glock dependencies 2037
glocks on reclaim list 0
log wraps 428
outstanding LM calls 0
outstanding BIO calls 0
fh2dentry misses 0
glocks reclaimed 45784677
glock nq calls 962822941
glock dq calls 962595532
glock prefetch calls 20215922
lm_lock calls 40708633
lm_unlock calls 23410498
lm callbacks 64156052
address operations 705464659
dentry operations 19701522
export operations 0
file operations 364990733
inode operations 98910127
super operations 440061034
vm operations 7
block I/O reads 90394984
block I/O writes 131199864
locks 2916542
locks held 1476005
freeze count 0
incore inodes 1454165
metadata buffers 12539
unlinked inodes 100
quota IDs 0
incore log buffers 11
log space used 13.33%
meta header cache entries 9928
glock dependencies 110
glocks on reclaim list 0
log wraps 2393
outstanding LM calls 25
outstanding BIO calls 0
fh2dentry misses 55546
glocks reclaimed 127341056
glock nq calls 867427
glock dq calls 867430
glock prefetch calls 36679316
lm_lock calls 110179878
lm_unlock calls 84588424
lm callbacks 194863553
address operations 250891447
dentry operations 359537343
export operations 390941288
file operations 399156716
inode operations 537830
super operations 1093798409
vm operations 774785
block I/O reads 258044208
block I/O writes 101585172
On Tue, Oct 7, 2008 at 1:33 PM, Shawn Hood <shawnlhood@xxxxxxxxx> wrote:
> Problem:
> It seems that IO on one machine in the cluster (not always the same
> machine) will hang and all processes accessing clustered LVs will
> block. Other machines will follow suit shortly thereafter until the
> machine that first exhibited the problem is rebooted (via fence_drac
> manually). No messages in dmesg, syslog, etc. Filesystems recently
> fsckd.
>
> Hardware:
> Dell 1950s (similar except memory -- 3x 16GB RAM, 1x 8GB RAM).
> Running RHEL4 ES U7. Four machines
> Onboard gigabit NICs (Machines use little bandwidth, and all network
> traffic including DLM share NICs)
> QLogic 2462 PCI-Express dual channel FC HBAs
> QLogic SANBox 5200 FC switch
> Apple XRAID which presents as two LUNs (~4.5TB raw aggregate)
> Cisco Catalyst switch
>
> Simple four machine RHEL4 U7 cluster running kernel 2.6.9-78.0.1.ELsmp
> x86_64 with the following packages:
> ccs-1.0.12-1
> cman-1.0.24-1
> cman-kernel-smp-2.6.9-55.13.el4_7.1
> cman-kernheaders-2.6.9-55.13.el4_7.1
> dlm-kernel-smp-2.6.9-54.11.el4_7.1
> dlm-kernheaders-2.6.9-54.11.el4_7.1
> fence-1.32.63-1.el4_7.1
> GFS-6.1.18-1
> GFS-kernel-smp-2.6.9-80.9.el4_7.1
>
> One clustered VG. Striped across two physical volumes, which
> correspond to each side of an Apple XRAID.
> Clustered volume group info:
> --- Volume group ---
> VG Name hq-san
> System ID
> Format lvm2
> Metadata Areas 2
> Metadata Sequence No 50
> VG Access read/write
> VG Status resizable
> Clustered yes
> Shared no
> MAX LV 0
> Cur LV 3
> Open LV 3
> Max PV 0
> Cur PV 2
> Act PV 2
> VG Size 4.55 TB
> PE Size 4.00 MB
> Total PE 1192334
> Alloc PE / Size 905216 / 3.45 TB
> Free PE / Size 287118 / 1.10 TB
> VG UUID hfeIhf-fzEq-clCf-b26M-cMy3-pphm-B6wmLv
>
> Logical volumes contained with hq-san VG:
> cam_development hq-san -wi-ao 500.00G
> qa hq-san -wi-ao 1.07T
> svn_users hq-san -wi-ao 1.89T
>
> All four machines mount svn_users, two machines mount qa, and one
> mounts cam_development.
>
> /etc/cluster/cluster.conf:
>
> <?xml version="1.0"?>
> <cluster alias="tungsten" config_version="31" name="qualia">
> <fence_daemon post_fail_delay="0" post_join_delay="3"/>
> <clusternodes>
> <clusternode name="odin" votes="1">
> <fence>
> <method name="1">
> <device modulename="" name="odin-drac"/>
> </method>
> </fence>
> </clusternode>
> <clusternode name="hugin" votes="1">
> <fence>
> <method name="1">
> <device modulename="" name="hugin-drac"/>
> </method>
> </fence>
> </clusternode>
> <clusternode name="munin" votes="1">
> <fence>
> <method name="1">
> <device modulename="" name="munin-drac"/>
> </method>
> </fence>
> </clusternode>
> <clusternode name="zeus" votes="1">
> <fence>
> <method name="1">
> <device modulename="" name="zeus-drac"/>
> </method>
> </fence>
> </clusternode>
> </clusternodes>
> <cman expected_votes="1" two_node="0"/>
> <fencedevices>
> <resources/>
> <fencedevice name="odin-drac" agent="fence_drac"
> ipaddr="redacted" login="root" passwd="redacted"/>
> <fencedevice name="hugin-drac" agent="fence_drac"
> ipaddr="redacted" login="root" passwd="redacted"/>
> <fencedevice name="munin-drac" agent="fence_drac"
> ipaddr="redacted" login="root" passwd="redacted"/>
> <fencedevice name="zeus-drac" agent="fence_drac"
> ipaddr="redacted" login="root" passwd="redacted"/>
> </fencedevices>
> <rm>
> <failoverdomains/>
> <resources/>
> </rm>
> </cluster>
>
>
>
>
> --
> Shawn Hood
> 910.670.1819 m
>
--
Shawn Hood
910.670.1819 m
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