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4.13. Displaying Extended GFS Information and Statistics
You can use the
gfs_tool command to gather a variety of details about GFS. This section describes typical use of the gfs_tool command for displaying space usage, statistics, and extended status.
The
gfs_tool command provides additional action flags (options) not listed in this section. For more information about other gfs_tool flags, refer to the gfs_tool man page.
4.13.1. Displaying GFS Space Usage
You can use the
df flag of the gfs_tool to display a space-usage summary of a given file system. The information is more detailed than a standard df.
Usage
gfs_tool df MountPointMountPoint- Specifies the file system to which the action applies.
Example
This example reports extended file system usage about file system
/mnt/gfs.
[root@ask-07 ~]# gfs_tool df /mnt/gfs
/gfs:
SB lock proto = "lock_dlm"
SB lock table = "ask_cluster:mydata1"
SB ondisk format = 1309
SB multihost format = 1401
Block size = 4096
Journals = 8
Resource Groups = 605
Mounted lock proto = "lock_dlm"
Mounted lock table = "ask_cluster:mydata1"
Mounted host data = "jid=0:id=786433:first=1"
Journal number = 0
Lock module flags = 0
Local flocks = FALSE
Local caching = FALSE
Oopses OK = FALSE
Type Total Used Free use%
------------------------------------------------------------------------
inodes 5 5 0 100%
metadata 78 15 63 19%
data 41924125 0 41924125 0%
4.13.2. Displaying GFS Counters
You can use the
counters flag of the gfs_tool to display statistics about a file system. If the -c option is used, the gfs_tool command continues to run, displaying statistics once per second.
Note
The majority of the GFS counters reflect the internal operation of the GFS file system and are for development purposes only.
The
gfs_tool counters command displays the following statistics.
locks- The number of
gfs_glockstructures that currently exist in gfs. locks held- The number of existing
gfs_glockstructures that are not in theUNLOCKEDstate. freeze count- A freeze count greater than 0 means the file system is frozen. A freeze count of 0 means the file system is not frozen. Each
gfs_tool freezecommand increments this count. Eachgfs_tool unfreezecommand decrements this count. incore inodes- The number of
gfs_inodestructures that currently exist in gfs. metadata buffers- The number of
gfs_bufdatastructures that currently exist in gfs. unlinked inodes- The
gfs_inodeddaemon links deleted inodes to a global list and cleans them up every 15 seconds (a period that is tunable). This number is the list length. It is related to the number ofgfs_unlinkedstructures currently in gfs. quota IDs- The number of
gfs_quota_datastructures that currently exist in gfs. incore log buffers- The number of buffers in in-memory journal log (incore log), before they are flushed to disk.
log space used- The the percentage of journal space used.
meta header cache entries- The number of
gfs_meta_header_cachestructures that currently exist in gfs. glock dependencies- The number of
gfs_depend structuresthat currently exist in gfs. glocks on reclaim list- The number of glocks on the reclaim list.
log wraps- The number of times journal has wrapped around.
outstanding LM calls- obsolete
outstanding BIO calls- obsolete
fh2dentry misses- The number of times an NFS call could not find a
dentrystructure in the cache. glocks reclaimed- The number of glocks which have been reclaimed.
glock dq calls- The number of glocks released since the file system was mounted.
glock prefetch calls- The number of glock prefetch calls.
lm_lock calls- The number of times the lock manager has been contacted to obtain a lock.
lm_unlock calls- The number of times the lock manager has been contacted to release a lock.
lm callbacks- The number of times the lock manager has been contacted to change a lock state.
address operations- The number of address space call operations (
readpage,writepage,directIO,prepare_write, andcommit_write) dentry operations- The number of times a seek operation has been performed on the vfs
dentrystructure. export operations- The number of times a seek operation has been performed on the nfs
dentrystructure. file operations- The number of file operations that have been invoked (read, write, seek, etc).
inode operations- The number of inode operations that have been invoked (create, delete, symlink, etc.).
super operations- The number of super block operations.
vm operations- The number of times the
mmapfunction has been called. mmap call count block I/O reads- obsolete
block I/O writes- obsolete
Usage
gfs_tool counters MountPointMountPoint- Specifies the file system to which the action applies.
Example
This example reports statistics about the file system mounted at
/mnt/gfs.
[root@tng3-1 gfs]# gfs_tool counters /mnt/gfs
locks 165
locks held 133
freeze count 0
incore inodes 34
metadata buffers 5
unlinked inodes 0
quota IDs 0
incore log buffers 0
log space used 0.05%
meta header cache entries 5
glock dependencies 5
glocks on reclaim list 0
log wraps 0
outstanding LM calls 0
outstanding BIO calls 0
fh2dentry misses 0
glocks reclaimed 345
glock nq calls 11632
glock dq calls 11596
glock prefetch calls 84
lm_lock calls 545
lm_unlock calls 237
lm callbacks 782
address operations 1075
dentry operations 374
export operations 0
file operations 1428
inode operations 1451
super operations 21239
vm operations 0
block I/O reads 0
block I/O writes 0
4.13.3. Displaying Extended Status
You can use the
stat flag of the gfs_tool to display extended status information about a GFS file.
Note
The information that the
gfs_tool stat command displays reflects internal file system information. This information is intended for development purposes only.
Usage
gfs_tool stat FileFile- Specifies the file from which to get information.
Example
This example reports extended file status about file
/gfs/datafile.
[root@tng3-1 gfs]# gfs_tool stat /gfs/datafile
mh_magic = 0x01161970
mh_type = 4
mh_generation = 3
mh_format = 400
mh_incarn = 1
no_formal_ino = 66
no_addr = 66
di_mode = 0600
di_uid = 0
di_gid = 0
di_nlink = 1
di_size = 503156
di_blocks = 124
di_atime = 1207672023
di_mtime = 1207672023
di_ctime = 1207672023
di_major = 0
di_minor = 0
di_rgrp = 17
di_goal_rgrp = 17
di_goal_dblk = 371
di_goal_mblk = 44
di_flags = 0x00000000
di_payload_format = 0
di_type = 1
di_height = 1
di_incarn = 0
di_pad = 0
di_depth = 0
di_entries = 0
no_formal_ino = 0
no_addr = 0
di_eattr = 0
di_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
