[Linux-cluster] GFS Journaling: How to interpret gfs_tool jindex output?
Sridharan Ramaswamy (srramasw)
srramasw at cisco.com
Tue Feb 13 01:08:52 UTC 2007
I'm trying to measure the usage of journal blocks created within a GFS
disk. I'm running bonnie++ small file test hoping to overwhelm the
journal with lot of entries to measure its peak usage. I saw gfs_tool
prints jindex data structure. Can anyone help to interpret its output?
Also I like to hear from anyone who went through similar exercise of
understanding GFS journal usage in an active system.
thanks,
Sridharan
[root at cfs1 cluster]$ gfs_tool jindex /mnt/gfs2
mh_magic = 0x01161970
mh_type = 4
mh_generation = 0
mh_format = 400
mh_incarn = 0
no_formal_ino = 21
no_addr = 21
di_mode = 0600
di_uid = 0
di_gid = 0
di_nlink = 1
di_size = 240
di_blocks = 1
di_atime = 1171308008
di_mtime = 1171308008
di_ctime = 1171308008
di_major = 0
di_minor = 0
di_rgrp = 0
di_goal_rgrp = 0
di_goal_dblk = 0
di_goal_mblk = 0
di_flags = 0x00000001
di_payload_format = 1000
di_type = 1
di_height = 0
di_incarn = 0
di_pad = 0
di_depth = 0
di_entries = 0
no_formal_ino = 0
no_addr = 0
di_eattr = 0
di_reserved =
...
Journal 0:
ji_addr = 61728
ji_nsegment = 63
ji_pad = 0
ji_reserved =
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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