I am trying for a best performance scenario combined with data
protection because the pool may hold data for up to a week.
I had considered a stgpool that spans all the disks with mirrored
partitions versus using hardware ssaraid. or using individual
filesystems with predefined volumes using mirrored partitions. my
current SSA adapters do not have fast-write cache but I will have access
to those adapters soon.

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Tab Trepagnier
Sent: Wednesday, August 04, 2004 8:21 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: D2D vs. tape backups with TSM?


Tim,

"It is possible to pre-define the volumes with DEFINE VOLUME (I have not
tried this)."

The limitation of one file system per FILE device class affects scratch
volumes only.  As far back as ADSM 3.1 I had FILE volumes belonging to
one
DevClass defined on six different disk file systems.  Your suggestion
works just as one would expect.  We pre-defined the FILE volumes to the
storage pool and everything worked fine for years.  Allowed us to spread
the disk load across all those disks without using RAID.

Tab Trepagnier
TSM Administrator
Laitram L.L.C.

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9/8/2004
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