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Re: [Linux-cluster] GFS - Small files - Performance



Hi..

So.. I set up this configuration but, don`t resolve my problem.

ilimit1 = 100
ilimit1_tries = 3
ilimit1_min = 1
ilimit2 = 500
ilimit2_tries = 10
ilimit2_min = 3
demote_secs = 100
incore_log_blocks = 1024
jindex_refresh_secs = 60
depend_secs = 60
scand_secs = 3
recoverd_secs = 60
logd_secs = 1
quotad_secs = 5
inoded_secs = 15
glock_purge = 50
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
statfs_fast = 1
seq_readahead = 0


2009/12/2 Mark Janssen <maniac.nl@gmail.com>
2009/11/30 Leonardo D'Angelo Gonçalves <leonardodg2084 gmail com>:
> Hi
>
> I have a GFS cluster on RHEL4.8 which one filesystem (10G) with  various
> directories and sub-directories and small files about 5Kb. When I run the
> command "du-sh" in the directory it generates about 1500 IOPS on the disks,
> for GFS it takes time about 5 minutes and 2 second for ext3 filesyem. Could
> someone help me with this problem. follows below the output of gfs_tool
> Why for GFS it takes 5 minutes and ext3 2 seconds ? Is there any relation ?

Try setting statfs_fast to '1'. This should speed up commands like 'df'.

gfs_tool settune <mount> statfs_fast 1

Do note that when you resize your filesystem you have to turn it back
off, and then back on again to update the size of your filesystem.

--
Mark Janssen  --  maniac(at)maniac.nl  --  pgp: 0x357D2178 |   ,''`.  |
Unix / Linux Open-Source and Internet Consultant @ Snow.nl |  : :' :  |
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