Re: [ADSM-L] 3584 upgrade: 3592-E05 to 3592-E07
2014-06-19 14:49:09
I'm not sure the problem is as bad as you think. Automatic tape libraries tend
to manage scratch
tapes first-in first-out in an effort to distribute tape wear evenly. My guess
is that your library
will use all of the JC volumes inserted at the start of the conversion before
using any of the JA
or JB volumes scratched after that. If you later clean out scratched JA and JB
volumes and add
JC scratch volumes, my guess is that the new batch of JC volumes will be used
before any JA
or JB volumes scratched after that.
For storage pool volumes you could eject JA and JB volumes in PENDING status to
eliminate
any worries about the volumes being reused. You could temporarily increase the
reuse delay
to give you a bigger window of opportunity for ejecting volumes and/or maintain
the normal
degree of readiness for restoring older versions of the TSM database.
Thomas Denier
Thomas Jefferson University Hospital
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Rhodes, Richard L.
Sent: Thursday, June 19, 2014 12:19 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] 3584 upgrade: 3592-E05 to 3592-E07
Hi,
This weekend we are upgrading all of our tape drives (in 2 libraries) from
3592-E05 (TS1120) to 3592-E07 (TS1140).
The libraries currently have a mix of JA and JB media.
We will be migrating over time to all new JC media.
JA tapes are READONLY on 3592-E07 drives.
JB tapes are READ/WRITE on 3592-E07 drives.
The plan is to:
- Export out of the lib all current scratch JA/JB media.
- Mark all existing JA/JB media ReadOnly.
- Insert lots of new JC media.
- TSM will write to the new JC tapes.
- As JA/JB tapes drop to scratch, export them out of the
Library, and insert more JC media.
When JA/JB tapes drop to SCRATCH status, I'm not sure I will always be able to
export them before TSM might try and reuse them. If TSM tries to use a JB
tape, that is OK - it will work. But what if TSM selects a JA tape and tries
to use it. That would fail since
3592-E07 drives can READ JA media but NOT WRITE to them.
Q) Is TSM smart enough to not load a JA media into a 3592-E07
drive for writing?
TSM has the media_type of all tapes (q libvol f=d), so I would think it should
know not to do this.
Thanks
Rick
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