Re: TSM Server 4.1.3 Performance
2001-11-05 14:56:38
1. Test the speed of a move data from tape drive to tape drive. If
this is also slow, the problem is not the storage pool setup.
2. If the move data is fast, test a storage pool flush from disk to
tape.
3. Compare these two speeds. (draw yourself a little picture and look
for bottle necks)
4. Look at total data flow for a short period of time and compare to
the "CASH". Make sure you are not pouring a pitcher of water into a 12 once
cup with a small hole of the bottom.
5. 3494 tape drive can write data (client compressed) at a rate of
12-13 Megs per second. LTO also.
6. Get a blankl tape and copy tape from the OS to it (bypass ADSM).
What is the speed?
Jeff Bach
Home Office Open Systems Engineering
Wal-Mart Stores, Inc.
WAL-MART CONFIDENTIAL
-----Original Message-----
From: Bill Mansfield [SMTP:WMansfield AT SOLUTIONTECHNOLOGY DOT COM]
Sent: Monday, November 05, 2001 11:56 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: TSM Server 4.1.3 Performance
Unless your storage device is heavily cached, like IBM ESS or the
other big
storage boxes.
There is no way to avoid Raid 5 on ESS, and there is no way to avoid
Raid 1
on EMC Symmetrix.
_____________________________
William Mansfield
Senior Consultant
Solution Technology, Inc
"Joshua S.
Bassi" To:
ADSM-L AT VM.MARIST DOT EDU
<jbassi@IHWY. cc:
COM> Subject: Re: TSM Server
4.1.3 Performance
Sent by:
"ADSM: Dist
Stor Manager"
<ADSM-L AT VM DOT MA
RIST.EDU>
11/05/2001
11:42 AM
Please
respond to
"ADSM: Dist
Stor Manager"
I would not recommend using RAID-5 for your disk storage pool unless
it
is the only copy of the data and you cannot afford to use plain
mirroring. TSM uses it's own striping technique for one and for two
RAID-5 has a sever write penalty associated with it.
--
Joshua S. Bassi
Independent IT Consultant
IBM Certified - AIX/HACMP, SAN, Shark
Tivoli Certified Consultant- ADSM/TSM
Cell (408)&(831) 332-4006
jbassi AT ihwy DOT com
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On
Behalf Of
Mike Wiggan
Sent: Sunday, November 04, 2001 11:20 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: TSM Server 4.1.3 Performance
Hi Guru's
I have recently installed a new TSM 4.1.3 server on a P600 and AIX
4.1.3. I
have 2*75Gybyte RAID5 Disk Cache attached through SSA. The
performance
for
reading from disk to tape is fine for small files, but I only get
2.5MB/Sec
when files are larger than say 1Gbyte. I have set "SELFTUNETXNsize
Yes",
and it brought it up tothis speed when using two drives.
I have 18 *4Gbyte files on each RAID5 and can see that the data is
evenly
distributed in each file. I can see that the file say 7Gbytes is
spread
throughout many of the Disk Storage Volumes. I don't want to go
straight
to
tape as this causes a huge headache in scheduling.
Is this a known bottleneck or is there a way around to get at least
20MB/Sec?
Kind Regards
Mike Wiggan, TCS/31
Infrastructure Integration Specialist
Petroleum Devlopment Oman LLC
(michael.ma.wiggan AT pdo.co DOT om)
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