ADSM-L

Re: TSM Server 4.1.3 Performance

2001-11-05 14:56:38
Subject: Re: TSM Server 4.1.3 Performance
From: Jeff Bach <jdbach AT WAL-MART DOT COM>
Date: Mon, 5 Nov 2001 13:52:21 -0600
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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