san - Suddenly bad disk I/O utilization on SQL-server even on weekend where we have few transactions -


on friday our ms sql-server 2012 showed 100% disk i/o utilization in new relic (performance monitor). hade made no updates ever , windows update showed nothing had happend. load on server low because fridays have low traffic on our website. disk i/o utilization has been kept high on weekend.

the server vm-ware machine 16 procs , 36 gb of memory. disk located in san.

we have 5 mb of reads per second , low on writes on database server. server has 500 i/o operations per second. cpu @ 25%

the database stored in 12 files on separate drive on server. no long running task running. server defragmentet , indexeson database have been rebuilt.

perfmon on sql server shows disk que @ peek 5.

our server guys says san running smoothly. gues happend on friday whick keeps our sql have wait file operations.

any ideas?

there lots of reasons happen.

most obvious, backup schedule?

if traffic low on friday iis shut down application pool after idle timeout, next hit website trigger reloading of data cached on application startup.

since database server virtualised, io server may virtualised (as opposed directly connecting sql server virtual machine storage on physical host). in case, database server performance may limited other machines on same host saturating link san.


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