In fact the problem is that, with tsm, there are no different scratch pools,
with different cartridges type in each.
TSM use all the scratch cartridges equally, whatever type of cartridge it can
be.
Thus, if you mixt LTO drives with one different generation between them (ie
LTO1/LTO2 LTO2/LTO3), you must use cartridges corresponding to the lowest
generation, to be write compatible with both drives type.
If you mixt LTO drives with a gap of TWO generation between them, if you have
scratch cartridges of the lowest type, they will generate hardware errors when
TSM will try to write them with the highest type drives and, on contrary, if
you have scratch of the highest type, they will generate hardware error when
writen with the lowest type drives.
This will happend if you have mixed drives on the same library.
If the library is partitioned, it is like if you had two library, each one with
a specific drive type and, of course, the relative cartridges, so there can be
no problems.
It is the same if you use library sharing manager software like ACSLS (and/or
LS), which can manage different drives and different scratch pools.
Consequence are that, if you wish to upgrade your drives, be careful about the
gap between drives generation.
And think strongly about mixing different drive types.
An other point, if upgrading all the drives on shot, if the gap one generation
max (ie LTO1/LTO3), you can still read cartdridges of the old generation, but
be carefull to make them read only to avoid hardware problems, even for read
access.
I mean, when a cartrdige is accessed for reading, if it is not in read only
access, the drive ensure that it can write on it resulting with hardware
errors, but if the cartrdige is in read only access, the drive read it
peacefully, without any problems.
Thanks,
Pierre
-----Message d'origine-----
De : ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] De la part de
Brian Matthias
Envoyé : dimanche 3 juin 2007 03:52
À : ADSM-L AT VM.MARIST DOT EDU
Objet : Re: [ADSM-L] Mixing drive types in logical library 3584
You may have found your answer; however, there is a TSM Technote on libraries
using mixed media.
The Technote reference number is 1155662
Regards,
Brian Matthias
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Chris McKay
Sent: Wednesday, May 30, 2007 12:39
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] Mixing drive types in logical library 3584
Hi all,
I have been told by IBM that fibre LTO2 drives are no longer available.
We
wish to expand the number of drives in our 3584 library from 2 to 5. The
current 2 drives are fibre LTO2 drives, would it pose a problem by adding an
additional 3 LTO3 drives to that logical library? Is it possible under
Windows?? I realize I will need to continue to use LTO2 media, as the existing
LTO2 drives would not be compatable with LTO3 media. Our TSM server is running
on Windows 2003.
Any input would be appreciated.
Regards,
Chris
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