Re: ASM I/O size
Date: Sun, 6 Jul 2008 21:17:00 -0700 (PDT)
Message-ID: <0ca34f29-e3e6-4f5f-adf6-d06a16b352e2@m3g2000hsc.googlegroups.com>
ASM uses (by default) 1MB as the stripe size. It is called Allocation
Unit (AU) in ASM terminology. This ASM AU size is (crudely) like your
extent size for datafiles and ASM reads one extent at a time from a
disk. Depending on how many disks you have you read n*1MB data per
read. There is an 'asmiostat' in the 11g version and I am not aware
of any such thing in your version.
-Gopal
On Jul 3, 4:25 pm, mak..._at_gmail.com wrote:
> Hello,
> I'm running under 10.2 database on AIX5.3L
>
> I have disk group ASM_DATA which has 100 SAN equi-sized (256GB) disks/
> luns. with MBRC of 16 & Block size of 16K , When I read a table of
> 10GB via FTS, what should be my I/O size/lun ? Should my I/O size be
> same for all the LUNs?
>
> 1) ASM level
> 2) I/O stats (iostat -D )
>
> Thanks
Received on Sun Jul 06 2008 - 23:17:00 CDT