Monitoring Disk activity

Whats the best perfmon counter to use to check how many
bytes are being read and written to disk/sec ?
I know most of the read and writes take place within a
virtual buffer cache, but what triggers a read/write from
disk .. I am currently running SQL 2000 if that helpsThe Physical Disk: Bytes Read(and Write) / Sec will give you just that. You
can also use fn_virtualfilestats() to get totals.
Andrew J. Kelly SQL MVP
"Jamie" <anonymous@.discussions.microsoft.com> wrote in message
news:23a5a01c45ecc$0b2044e0$a301280a@.phx
.gbl...
> Whats the best perfmon counter to use to check how many
> bytes are being read and written to disk/sec ?
> I know most of the read and writes take place within a
> virtual buffer cache, but what triggers a read/write from
> disk .. I am currently running SQL 2000 if that helps|||Hi,
Add on, Have a look into this link.
http://www.sql-server-performance.c...counters_io.asp
Thanks
Hari
MCDBA
"Andrew J. Kelly" <sqlmvpnooospam@.shadhawk.com> wrote in message
news:#bLPn2sXEHA.2816@.TK2MSFTNGP11.phx.gbl...
> The Physical Disk: Bytes Read(and Write) / Sec will give you just that.
You
> can also use fn_virtualfilestats() to get totals.
> --
> Andrew J. Kelly SQL MVP
>
> "Jamie" <anonymous@.discussions.microsoft.com> wrote in message
> news:23a5a01c45ecc$0b2044e0$a301280a@.phx
.gbl...
>|||I generally start off by observing Physical Disk queue length counters as
this tells you whether the disk subsystem is keeping up with the i/o
requests made by sql (or other apps on the same box) through windows. This
is because i/o requests are queued by windows against the i/o subsystem and
if that queue is too large (more than a few i/o's per phsyical disk) or
growing, you have a clear indication that the disk is a bottleneck (not
keeping up).
If you do see a problem here, you next need to ascertain whether the amount
of work being sent to the disk is excessive, due to inefficient query plans
etc.
HTH
Regards,
Greg Linwood
SQL Server MVP
"Jamie" <anonymous@.discussions.microsoft.com> wrote in message
news:23a5a01c45ecc$0b2044e0$a301280a@.phx
.gbl...
> Whats the best perfmon counter to use to check how many
> bytes are being read and written to disk/sec ?
> I know most of the read and writes take place within a
> virtual buffer cache, but what triggers a read/write from
> disk .. I am currently running SQL 2000 if that helps