XFS_User_Guide/en-US/XFS-monitoring.xml

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<chapter id="xfs-monitoring">
	<title>XFS Monitoring</title>
	<section>
		<title>Monitoring</title>
		<para>A lot of performance and utilisation data can be collected</para>
		<itemizedlist>
		<listitem><para>Generic filesystem and memory statistics</para></listitem>
		<listitem><para>Specific XFS metrics</para></listitem>
		</itemizedlist>
		<para>There are a range of tools that can be used</para>
		<itemizedlist>
		<listitem><para>/proc/*</para></listitem>
		<listitem><para>sar</para></listitem>
		<listitem><para>vmstat</para></listitem>
		<listitem><para>top, topsys</para></listitem>
		<listitem><para>Performance Co-Pilot</para></listitem>
		<listitem><para>etc.</para></listitem>
		</itemizedlist>
	</section>
	<section>
		<title>Inodes</title>
		<para><programlisting>watch grep inode /proc/slabinfo</programlisting></para>
		<para><programlisting>slabtop -s c</programlisting></para>
		<itemizedlist>
		<listitem><para>Monitor the slab</para></listitem>
		</itemizedlist>
		<para><programlisting>sar -v</programlisting></para>
		<itemizedlist>
		<listitem><para>inode statistics collected by sadc</para></listitem>
		</itemizedlist>
	</section>

	<section>
		<title>PCP Inode Metrics</title>
		<para><programlisting>
ig_attempts		# of looks for inode in memory 
ig_found		# of times inode found in memory 
ig_frecycle		# of fails because inode was busy 
ig_misses		# of times had to go to disk for inode 
ig_dup			# times missed but found from another
ig_reclaims		# of times recyled the inode’s memory 
ig_attrchngx		# of times changed inode attributes 
iflush_count		# of times inodes are being flushed 
icluster_flushcnt	# of times inodes clustered
icluster_flushinode	# of times not able to inode cluster</programlisting></para>
	</section>

	<section>
		<title>PCP Directory Metrics</title>
		<para><programlisting>
lookup			# of file name directory lookups 
create			# of directory entry creations 
remove			# of directory entry removes 
getdents		# of “getdent” operations</programlisting></para>
	</section>

	<section>
		<title>PCP File Attribute Metrics</title>
		<para><programlisting>
attr.get		# of “get” operations		
attr.set		# of “set” operations
attr.remove		# of “remove” operations
attr.list		# of “list” operations</programlisting></para>
	</section>

	<section>
		<title>PCP Allocation Metrics</title>
		<para><programlisting>
allocs.alloc_extent	# of extents allocated
allocs.alloc_block	# of blocks allocated
allocs.free_extent	# of extents freed
allocs.free_block	# of blocks freed
alloc_btree.lookup	# of allocation btree lookups		
alloc_bteee.compare	# of compares in alloc btree lookup
alloc_btree.insrec	# of extent record inserts in btree
alloc_btree.delrec	# of extent record deletes in btree</programlisting></para>
	</section>

	<section>
		<title>PCP Block Map Metrics</title>
		<para><programlisting>
block_map.read_ops	# of block map reads
block_map.write_ops	# of block map writes
block_map.unmap	# of block delete operations
block_map.add_exlist 	# of extent list insertions for files
block_map.del_exlist	# of extent list deletions
block_map.look_exlist	# of extent list lookups
block_map.cmp_exlist	# of extent list compares
bmap_btree.lookup	# of block map btree lookups
bmap_btree.compare	# of block map compares
bmap_btree.insrec	# of block map insertions
bmap_btree.delrec	# of block map deletions</programlisting></para>
	</section>

	<section>
		<title>PCP Journaling Metrics</title>
		<para><programlisting>
transaction.sync		# of transactions waiting to be committed
transaction.async	# of async transactions waiting
transaction.empty	# of transactions that did not do anything
log.writes		# of log buffer writes
log.blocks		# of log blocks written
log.noiclogs		# of log entry attempts during memory flush
log.force		# of calls to xfs_log_force
log.force_sleep		# of calls to xs_log_force_sleep</programlisting></para>
	</section>

	<section>
		<title>PCP AIL Metrics</title>
		<para><programlisting>
push_ail.pushes		# of times the AIL is moved forward
push_ail.success	# of times sucessful
push_ail.pushbuf	# of times inode locked – pushbuf called
push_ail.pinned		# of times pinned
push_ail.locked		# of times locked
push_ail.flushing	# of times ail was flushing
push_ail.restarts	# of log write restarts
push_ail.flush		# of times a log was forced</programlisting></para>
	</section>

	<section>
		<title>PCP Quota Metrics</title>
		<para><programlisting>
reclaims		# of disk quota reclaims
reclaims_misses	# of disk quota reclaim misses
dquot_dups		# of duplicates
cachemisses		# of times disk quota misses cache
cachehits		# of times disk quota in cache
wants			# of times dqwants called
shake_reclaims		# of shaked reclaims
inact_reclaims		# of inactive data reclaims</programlisting></para>
	</section>

	<section>
		<title>xfsstats</title>
		<para>xfsmisc/xfsstats.pl -f</para>
	</section>
</chapter>