Hi Daniel,
every Subsystem attached to the TSM-Server has its own SCSI-Channel:
3583 (2 LTO1-Drives, Library Controller)
3582 (2 LTO2-Drives, Library Controller)
7337 (2 Drives, Controller)
various external HDDs
I think (or better: hope) that the TSM-Server has to "pick" the right files
from the 3583-Tape, so there is a lot of rewinding and fast-forwarding
involved. (move nodedata for a single (but big) filespace).
Unfortunaltely, topas is not installed and this is not "my" server, I'm
currently at a customer's site, I cannot install anything without begging
:(, so I think I have to wait until a significant amount of data resides on
the new Library so I can "move data" to see how fast the Lib/Drives really
are...
Thanks for your support !!
Greetings,
Sascha
> Hi Sascha
>
> Are the drives connected on the same adapter? In this case, the
> "shoe-shine" effect is probably what you're seeing. Your new LTO-2 drive
> have variable speed. However, the speed is only adjustable as long as the
> speed doesnt fall below 15MB/s. Your LTO-1 drives has a maximum transfer
> rate of 15MB/s uncompressed. This could mean, the LTO-1 drives doesnt
> deliver data fast enough to the LTO-2 drives.
>
> If you're using SCSI connected drives, this could impose a real impact on
> performance, as the SCSI adapter is arbitrated, and therefore cannot write
> to more than one device at a time.
>
> If you're using AIX, you could use for example topas(if its installed) so
> see the performance of your tape drives. As long as no other procesess or
> sessions are running, you could look at the top right number(tty
> write/read) to determine the speed of the tape drives.
>
> Best Regards
>
> Daniel Sparrman
> -----------------------------------
> Daniel Sparrman
> Exist i Stockholm AB
> Propellervdgen 6B
> 183 62 TDBY
> Vdxel: 08 - 754 98 00
> Mobil: 070 - 399 27 51
>
>
>
> Sascha Askani <se7en_t_2 AT GMX DOT NET>
> Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
> 2004-07-05 13:46
> Please respond to
> "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
>
>
> To
> ADSM-L AT VM.MARIST DOT EDU
> cc
>
> Subject
> Re: 3582 supported on TSM 5.2.2 AIX ?
>
>
>
>
>
>
> Hi Daniel,
>
> thanks for your fast reply, I feel somewhat relieved that the lib is
> supported, because I face major performance problems with this library at
> the moment doing a "move nodedata" 3583(LTO1) -> 3582(LTO2), but I can't
> say
> if this is a Library-, SCSI- or TSM-Problem or no problem at all (for
> example "Shoe-shine" on the 3583...
>
> Greetings
>
> Sascha Askani
>
> > Hi Sascha
> >
> > It means from, so you shouldnt have any problems using your 3582 under
> TSM
> > 5.2.2.2. The only tape libraries from IBM that has gone out of support
> is
> > the 3575-series of libraries.
> >
> > Notice that you will have to download and install the IBM Atape device
> > driver, which you can download from
> > ftp://ftp.software.ibm.com/storage/devdrvr/AIX.
> >
> > Best Regards
> >
> > Daniel Sparrman
>
>
> >
> > Sascha Askani <se7en_t_2 AT GMX DOT NET>
> > Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
> > 2004-07-05 13:18
> > Please respond to
> > "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
> >
> >
> > To
> > ADSM-L AT VM.MARIST DOT EDU
> > cc
> >
> > Subject
> > 3582 supported on TSM 5.2.2 AIX ?
> >
> >
> >
> >
> >
> >
> > Hi List !
> >
> > I just wanted to assure that the IBM 3582 (SCSI)-Library is supported
> > under
> > TSM 5.2.2 (AIX) because "Supported Devices" on IBM-Website tells me:
> >
> > IBM 3582 Ultrium Scalable AIX HPUX SUN WIN
> > The IBM device driver is required.
> > 2 Drives 24 Slots 5.1.6.5 5.1.6.5 5.1.6.5 5.1.6.5
> >
> > Does this mean that said library is ONLY supported under 5.1.6.5 or is
> it
> > supported FROM 5.1.6.5 ON ?
> >
> > Thanks for your support !
> >
> > Sascha Askani
> >
>
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