First, take what you've got and throw a LOT more RAM at it. I can't
believe you're getting what you are actually getting out of only 3GB,
without memory constraint showing up somewhere, such as lowered database
cache hit ratios, or tape I/O buffers being too small which will slow
down your tape drives. Just because you're not paging doesn't mean that
more memory wouldn't help. (The TSM image working set probably stays in
real memory regardless.)
That 6F1 is a pretty muscular I/O engine, which will be tough to beat.
They'e showing up on the used market now - get a second one if you think
you can split your clients. (You'd have to split them a lot more ways
if you went to another platform.)
Roger Deschner University of Illinois at Chicago rogerd AT uic DOT edu
On Thu, 25 Mar 2004, James R Owen wrote:
>?Can Linux (or Win?) replace AIX for hosting an I/O intensive TSM service?
>
>After scanning the past year's ADSM-L postings including Linux in the subject
>I have the impression that a few people are playing with Linux hosting a TSM
>service, but real I/O intensive TSM services are still mainly hosted by AIX.
>
>?Is anyone already using or actively planning to use Linux (RedHat EL 3.0?)
>to host an I/O intensive TSM service similar to any described under the
>recent ADSM-L thread, "Sizing an AIX platform and tape libraries"?
>
>We believe we are approaching the maximum that can be achieved w/
> TSM: v5.2.1.3
> OS: AIX 5.1 (64bit)
> CPU: IBM 7025-6F1 w/ 4 * 750Mhz proc's + 3GB RAM
> SAN: 1 Gb w/ EMC Symmetrix 8830
> LAN: 1 Gb Ethernet
> ATL: IBM 3494 w/ 6 * 3590E drives
> IBM 3584 w/ 4 * 3580 LTO1 + 2 * 3580 LTO2 drives
>
>This configuration is successfully supporting our current ITS TSM service
>(see details below), but we believe we either need a major performance
>boost or to split this load onto an additional host platform:
> Linux, Win*, or must we remain w/ AIX for I/O performance?
>to handle expected additional growth.
>
>Which platform have you chosen (or would you choose) for similar TSM service?
>
>Yale ITS TSM Service:
>--------------------
> Active Clients: 2400 <= 3d, 2500 <= 7d, 2700 <= 35days
>
> Servers: 151
> WinNT,2K* 105
> Linux 20
> Solaris 9
> AIX 7
> SQL-BT (Oracle) 3
> Mac 2
> TDP's: MSSQL,MSexchg: 2 + 1
> [new] 2
>
> Personals: 2549
> WinNT,2K*,XP 2230
> Win98,ME 26
> Mac 183
> Linux 50
> Solaris 5
> AIX,DEC*X,HPUX,IRIX: 1 ea.
> [new] 51
>
> Expected growth: +500-600 clients for several years
> +20% data for existing clients/year?
>
> TSM DB: 75.7% of 160GB
> BAckup DB w/ LTO1 HCmpr. takes 2.3h
> EXPIre Inv examines ~6M obj, deletes ~1M obj. in 8-9h
>
>
> Disk STGpools: 600 + 180GB
> Nightly Backup Period: 15:30-08:00+
> Weeknight Backup Load: 500-650GB+
>
>Thanks for any experience/insight you are willing to share with us!
>--
>Jim.Owen AT Yale DOT Edu (203.432.6693)
>
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