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- Mark
-----Original Message-----
From: Craig E. Tull [SMTP:cetull@lbl.gov]
Sent: Tuesday, February 10, 1998 12:49 AM
To: challenge@sseos.lbl.gov
Subject: HPSS classes of service
I fear I was spreading blatant falsehoods at the Objectivity Quick Start
Class.
According to our NERSC HPSS experts, a single file can only belong to one
HPSS class of service at a time. Moving a file between two classes of
service implies a physical copy of the file from one tape to another.
This means that the scheme of accessing an Objectivity database file
through two distinct channels:
1> the Storage Manager class of service
(with most of the tape drives and disk cache)
2> the "rouge pointer" class of service
would not be possible.
- Craig
-----------------------------------------------------
Craig E. Tull, Ph.D.
National Energy Research Scientific Computing Center
E.O. Lawrence Berkeley National Laboratory
EMail: cetull@lbl.gov WWW: iago.lbl.gov/~tull
Phone: (510)486-7253 FAX: (510)486-4004