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Re: [Linux-cluster] Re: GFS hanging on 3 node RHEL4 cluster



Shawn,
    Looking at the output below you may want to try and increase statfs_slots to 256. Also, if you have any disk monitoring utilities that monitor drive usage you may want to set statfs_fast equal to 1.

---
Jay
Shawn Hood wrote:
High priorty support request, I mean.

On Mon, Oct 13, 2008 at 5:32 PM, Shawn Hood <shawnlhood gmail com> wrote:
  
As a heads up, I'm about to open a high priority bug on this.  It's
crippling us.  Also, I meant to say it is a 4 node cluster, not a 3
node.

Please let me know if I can provide any more information in addition
to this.  I will provide the information from a time series of
gfs_tool counters commands with the support request.

Shawn

On Tue, Oct 7, 2008 at 1:40 PM, Shawn Hood <shawnlhood gmail com> wrote:
    
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 gmail com> 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

      

--
Shawn Hood
910.670.1819 m

    



  


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