It's been my experience that the problem is not the large number of
tapes a restore takes when not collocating, rather it's the large
mount, unmount seek and rewind times associated with each tape mount
that is the problem. If you have sub-second mount, unmount, seek and
rewind times then there is not a large penalty to pay when not
collocating. I use a Virtual Tape Library which is just an ATL
emulation front end to a "disk only stgpool". I do not collocate and
have no problem restoring large servers housing thousands of small
files, the kind of environment that usually demands collocation. The
question to consider is "what are the pros & cons to a large native disk
pool vs. an appliance such as a VTL". I decided on a VTL to preserve
LAN-free backup ability and compression.
Milton
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Spearman, Wayne
Sent: Monday, December 05, 2005 3:34 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Disk Only backups
We are planning to move a large number of our nodes to "disk only"
backups and eliminate tape for them. The diskpools will be devtype=file.
I struggle with whether to collocate these disk volumes or not and how
large to make them. I've had some discussions with IBM, but would like
to ask others to share their experiences with me.
Any input would be welcome.
Thanks,
Wayne
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