Re: ANR13300E & ANR1331E
2005-11-02 13:29:31
Richard
It's an interesting point you raise about CRC checking. I debated this
extensively with IBM support in the course of the PMR. The CRC checking on
storage pool data only gives you a way of checking for corruption after it
has occurred - eg through auditing volumes.
This would have left me no better off as auditing the volumes without CRC
data enabled showed the corruption anyway. The CRC checking would only have
made a difference if the meta data (ITSM frame data) was intact but the
user data (contents of bitfiles) was corrupt.
What I wanted was a way of detecting the corruption at the time it
occurred. I have received excellent explanations why this is not possible
from a TSM point of view if the OS or drive do not report an error. The
only alternative is to do a read-after-write, but this is prohibitive from
a performance point-of-view.
We've had nothing like it since, but I must say it shook my confidence for
a long while afterwards.
Regards
Neil Schofield
Yorkshire Water Services Ltd.
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