[CentOS] Question about iostat output

[nate]

Pascal Robert wrote:
> Hello,
>
> We are planning to moving most of our servers to ESX but before buying
> our SAN, we want to do some I/O stats to see if iSCSI is enough or if
> we have to go with FC. So I found a plugin for Nagios that can log I/O
> stats with iostat. So far it's fine with single disk/one partition
> servers, but on our Oracle Database 10g server, we have two drives in
> RAID 1 (/dev/sda) and 4 other drives in RAID 10 (/dev/sdb). When I
> query iostat, I get :

I much prefer iostat -x, provides much more information, iostat
by itself to me is pretty useless.

I don't even trust i/o stat on my bigger systems I query their
performance from the array directly where I can get much better
performance information where it really counts.

nate