topic Re: FC60 maximum disk I/O possible in Disk

FC60 maximum disk I/O possible

Valarie Lim — Thu, 23 May 2002 03:11:47 GMT

Hi,

I have an FC60 disk storage configured with 3 LUN

LUN1 = 6 disks (RAID 1/0)
LUN2 = 4 disks (RAID 1/0)
LUN3 = 4 disks (RAID 5)

The average possible write byte rate for LUN1 is only 6MB. How do i see the I/O of each individual disk in each LUN.

I read from one of the earlier mail stating that the maximum transfer rate of a 10000rpm disk is 25-40MB.

But now I am having 6 disks and yet the average write byte rate is only 6 MB.

Can someone help me on this?

Thanks!
Yew Meng

Re: FC60 maximum disk I/O possible

Bill McNAMARA_1 — Thu, 23 May 2002 10:42:38 GMT

How are you testing your write?

iostat -t 5
and
dd

or via application?

What else is configured on the loop and how are you accessing the array via LVM VG and Filesystem configuration?

mount
strings /etc/lvmtab

Later,
Bill

Re: FC60 maximum disk I/O possible

Valarie Lim — Fri, 24 May 2002 05:07:42 GMT

Hi Bill,

I am testing the write using the Oracle application. These disks actually house a datawarehouse.

There is nothing else in the loop except the FC60 array configured in split bus mode.

attached with this mail the the throughput of the Disk using iostat.

from the log,
theLUN1 is actually c3t0d0.

Thanks!
Yew Meng