[Linux-cluster] GFS directory freezing unexpectedly under pressure ...

[Gordan Bobic]

Are you sure you are using GFS1 and not GFS2? I've experienced that 
problem with GFS2, but not with GFS1.

Gordan

tam_annie at aliceposta.it wrote:
> Hi everybody,
> 
>    when my GFS (v. 1) filesystems experience some heavy load (ex. vmware 
> virtual machine OS installation, oracle rman backup using gfs 
> filesystems as flash recovery area), they "freeze" unexpectedly.
>    More precisely, not the whole gfs filesystem freezes, but only the 
> directory interested by the load: I can't even ls the contents of that 
> directory, everything interesting it seems to hang hopelessly. I can't 
> find any related errors in my logs; cluster utilities output (clustat, 
> group_tool -v, cman_tool nodes) looks absolutely normal ... (no fencing 
> is occurring): I can even go on working on the other directories of the 
> same gfs!!!
> The only way out I've found is to restart the cluster. I can reproduce 
> deterministically the problem, but I don't know how to debug it.
> 
>   I noted that the problem arises on both my 2-node and my 1-node 
> cluster, either when I mount gfs with 'noquota,noatime' or not.
> 
>   Your help is my hope:
>   thank you in advance!
>   Tyzan
> 
> ___________________________________________________________________________________________________ 
> 
> Linux xxxxxxxxxxxxxxxx 2.6.18-8.1.8.el5 #1 SMP Tue Jul 10 06:39:17 EDT 
> 2007 x86_64 x86_64 x86_64 GNU/Linux
> 
> lvm2-cluster-2.02.16-3.el5
> kmod-gfs-0.1.16-5.2.6.18_8.1.8.el5
> gfs2-utils-0.1.25-1.el5
> gfs-utils-0.1.11-3.el5
> cman-2.0.64-1.0.1.el5
> rgmanager-2.0.24-1.el5
> 
> 
>   [root at orarac1 ~]# gfs_tool gettune /share
> ilimit1 = 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
> quota_simul_sync = 64
> quota_warn_period = 10
> atime_quantum = 3600
> quota_quantum = 60
> quota_scale = 1.0000   (1, 1)
> quota_enforce = 1
> quota_account = 1
> 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
> 
> 
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