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 <[EMAIL PROTECTED]>@VM.MARIST.EDU> on 05/09/2002 08:46:02 > AM > > Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> > > Sent by: "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> > > > To: [EMAIL PROTECTED] > 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. >