Alan,
When will companiies learn that without their data, they have no business.
Delaying required hardware upgrades may look a good saving, but often have
hidden and in your case not so hidden extra costs
regards,
John
Alan Davenport <[EMAIL PROTECTED]> on 03/20/2002 02:28:58 PM
Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
cc: (bcc: John Naylor/HAV/SSE)
Subject: Re: Read-Only tapes.
It is BOTH the drives and the tapes. Some of the tapes are over 10 years
old, if not more, and are still in service. My company is (finally) looking
to get new tape technology. The reason I asked the question was to make sure
that audit did in fact read the tapes. I believed that it did but wanted to
make sure. Quite often the tapes are not at fault and I do not want to ditch
them unnecessarily. The drives themselves are showing their age. I cannot
wait until we get away from 3490's. I have 11,985 tapes in use on a 18.7GB
database that is 87% utilized. Those 3490's just don't hold enough data for
a modern shop. Some of our larger servers have their data on HUNDREDS of
co-located tapes. Can you imagine the restore time for that server?
Take care,
Al
Alan Davenport
Senior Storage Administrator
Selective Insurance
[EMAIL PROTECTED]
(973) 948-1306
-----Original Message-----
From: John Naylor [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, March 20, 2002 6:42 AM
To: [EMAIL PROTECTED]
Subject: Re: Read-Only tapes.
Alan,
My understanding is that a default audit volume will physically read the
tape,
and mark as damaged in the database those files that it cannot read.
Subsequent
reads of that tape will then skip the damaged files.
If you specify aufit volume with the " fix=yes" parameter then the database
entry for any unreadable file will be deleted.
Are you sure that it is the drives that are the problem and not the batch of
tapes.
What type of write errors are you seeing temporary or pemanent.
If they are permanent write errors I personally would ditch the tapes or at
least run an erase against
them before reuse.
regards,
John
Alan Davenport <[EMAIL PROTECTED]> on 03/19/2002 06:43:56 PM
Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
cc: (bcc: John Naylor/HAV/SSE)
Subject: Read-Only tapes.
Hello,
I am running TSM 4.1 on OS/390 and using 3490E tapes. Since the
tapes themselves and the drives that use them are aging, I get several tapes
that go to read-only status due to write errors each week. I am currently
doing MOVE DATA on these volumes then UPD VOL 123456 ACCESS=READW after the
data is moved off of the tape. My question is does an AUDIT VOL 123456
actually verify the data on the tape or does it just verify the database
entries for the volume? I know that a move data function, by its very
nature, verifies that the data can be read. It also has the advantage of
getting the data off of a suspect tape. However the disadvantage is that
two drives as opposed to one are required for move data and in most cases
the tapes are OK and the write error is due to a drive hiccup. I would like
to hear your thoughts on this.
Take care,
Al
Alan Davenport
Senior Storage Administrator
Selective Insurance
[EMAIL PROTECTED]
(973) 948-1306
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