I haven't seen the same thing as you. I was using raw logical volumes,
and converted to JFS. I saw little if no penalty during write, but a
big win during the sequential reads. As always, your mileage may vary,
but I would not rule out JFS if I was you.
Andy Carlson |\ _,,,---,,_
Senior Technical Specialist ZZZzz /,`.-'`' -. ;-;;,_
BJC Health Care |,4- ) )-,_. ,\ ( `'-'
St. Louis, Missouri '---''(_/--' `-'\_)
Cat Pics: http://andyc.dyndns.org/animal.html
On Thu, 9 May 2002, Rich Brohl wrote:
> Chris,
>
> I would create a "stripped logical volume" using as many disk as possible
> (the more the better) in the Volume Group. Also, do not create a
> filesystem just leave the Logical Volume in the Volume Group. This will
> keep you from having to deal with the AIX JFS overhead. When you define
> your volumes to the disk storage pool point it to the (r)logical volume
> name. For instance if you create a logical volume in the volume group
> named tsmstg1lv, then in TSM define you volume /dev/rstmstg1lv to the disk
> storage pool. This will give you some awesome throughput.
>
> On the flip side when you do your migration to tape you will be doing
> mostly sequential reads from the disk storage pools so the can keep the
> tape drive(s) running at max write speed.
>
> Rich Brohl
> ISM Support
> Tie Line 547-9317
> Direct 303-693-4969
> Pager 888-524-9030
>
>
> chris rees <rees_chris AT HOTMAIL DOT COM>@VM.MARIST.EDU> on 05/09/2002
> 08:46:02
> AM
>
> Please respond to "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
>
> Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
>
>
> To: ADSM-L AT VM.MARIST DOT EDU
> cc:
> Subject: comments on disk storage plan
>
>
> Hi all,
>
> Just wanted to sanity check my disk storage pool layout I'm planning.
>
> AIX 4.3.3
> Server H80
> 2 x D40 SSA drawers, two loops over two SSA 160 adapters
> 32 x 9Gb SSA disks
> Max nodes backing up at any one time is approx 6
>
> I don't want to mirror the volumes
>
> 32 x 9Gb logical volumes, each logical volume on one SSA disk. These lvs
> will then translate into 32 disk storage pool volumes. This way if I have a
> disk failure I only lose one disk pool volume.
>
> Anyone got any ideas what kind of read/write performance I should expect to
> see from this config?
>
> Any other options considered.
>
> Regards
>
> Chris
>
>
>
> _________________________________________________________________
> Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp.
>
|
