When going to sequential drives, a single migration process will sequentially store
files on ONE volume until it is filled (or a I/O error occurs on tape) and then
proceed to the next tape. One large (or not so large) file can and will span multiple
volumes if EOT is reached on a tape and the file has not been completely
copied/migrated. I have seen this happen many times (TSM server 3.7.4.0 is out
current).
Thus a file, regardless of size is attempted to be put on as few tapes as possible. I
believe this is the same for collocation, but don't use collocation here.
David B. Longo
System Administrator
Health First, Inc.
3300 Fiske Blvd.
Rockledge, FL 32955-4305
PH 321.434.5536
Pager 321.634.8230
Fax: 321.434.5525
[EMAIL PROTECTED]
>>> [EMAIL PROTECTED] 02/19/01 12:59PM >>>
Hi all,
I would like to get some help/infos/ideas for better understanding the
performance point of view.
If some clients are backed up into a disk storage pool, the data (files)
from this storage pool will be migrated into the next storage pool (type
sequential for example) if watermarks are reached. During this migration the
files are stored at the end of the chain "storage pool" -- "device class" --
"library" -- "drives" to drives, to all available drives I assume and isn't
collocation enabled all files are distibuted over the volumes, but no
single file is spread out over the volumes. This means to me, that one huge
file would be stored to just one drive, even if many drives available,
correct ?
As far as I know about TSM it is different in the TDP for SAP, there I can
stream to different tapes, but what about TDP for Oracle and how can I
manage to get a huge file saved as fast as possible?
many thanks for your help
regards
Michael
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