Mark, As we planned to migrate part of our storage pools to SATA disks in the following weeks, I would be grateful to get a copy of your guidelines !
TIA. Cheers. Arnaud ************************************************************************ ****** Panalpina Management Ltd., Basle, Switzerland, CIT Department Viadukstrasse 42, P.O. Box 4002 Basel/CH Phone: +41 (61) 226 11 11, FAX: +41 (61) 226 17 01 Direct: +41 (61) 226 19 78 e-mail: [EMAIL PROTECTED] ************************************************************************ ****** -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of Mark D. Rodriguez Sent: Monday, 15 November, 2004 00:49 To: [EMAIL PROTECTED] Subject: SUSPECT: (MSW) Re: TSM and SATA Disk Pools Charles, I may be missing something here, but even your numbers out of the Symetrix seem pretty bad. Are you sure you didn't drop a "0" somewhere? I have one customer that I set up using SSA drives with JFS2 filesystems and LTO1 drives and we average between 35 and 40MB/sec. and some days as high as 45MB/sec (compression of data plays a large factor). Your Symetrix at 40GB/hr is only 11.11MB/sec! BTW, this is with no unusual tuning to the system, since this was more than enough performance for their needs. With a little more tuning I could easily increase that by 50% and possibly double it if I really tried and that is ancient SSA technology. FC technology should be much faster. I know there are many people who prefer raw lvs for there disk pools, but on an AIX system I don't believe it is worth it. I have never had anyone show me raw lv numbers on AIX that I could not match (with far less hassle) with a good JFS2 configuration. If raw is the way you want to go than I wish you luck. However, if you are interested in switching to using a JFS2 approach I would be glad to post to the list some simple guidelines for configuring your environment to get much better performance than you are reporting in your post. -- Regards, Mark D. Rodriguez President MDR Consulting, Inc. ======================================================================== ======= MDR Consulting The very best in Technical Training and Consulting. IBM Advanced Business Partner SAIR Linux and GNU Authorized Center for Education IBM Certified Advanced Technical Expert, CATE AIX Support and Performance Tuning, RS6000 SP, TSM/ADSM and Linux Red Hat Certified Engineer, RHCE ======================================================================== ======= Hart, Charles wrote: >Thanks you for the link.. Good info! > > >-----Original Message----- >From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] Behalf Of >William F. Colwell >Sent: Friday, November 12, 2004 10:52 AM >To: [EMAIL PROTECTED] >Subject: Re: TSM and SATA Disk Pools > > >Charles, > >See http://www.redbooks.ibm.com/abstracts/tips0458.html?Open > >This was in a recent IBM redbooks newsletter. It discusses SATA >performance and to me it says that the tsm backup diskpool is not a good use for SATA. >Sequential volumes on SATA may be ok. > >Hope this helps, > >Bill >At 10:21 AM 11/12/2004, you wrote: > > >>Been asking lots of questions lately. ;-) >> >> >>We recently have put our TSM Disk Backup Pools on Clarrion SATA. >> The TSM Server is being presented as 600GB SATA Chunks >> Our Aix Admin has put a Raw logical over two 600GB Chunks to >>create a 1.2TB Raw Logical Volume >> >>Right now we are seeing Tape migrations @ about 4GB in 6hrs, where before on EMC Symetrix disk we saw 29-40GB per hour. If anyone would like to share their TSM SATA Diskpool layout and or tips we would much appreciate it!!! >> >> >>TSM Env >>AIX 5.2 >>TSM 5.2.4 (64bit) >>p630 4x4 >>8x3592 FC Drives >> >>Regards, >> >>Charles >> >> > >---------- >Bill Colwell >C. S. Draper Lab >Cambridge Ma. > > >
