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> We are about to implement a fairly large DECsafe environment (2
> separate clusters - each with 2 8400's and multiple HSZ50 and a few
> hundred GB's of disk). The disks will be hardware RAIDed only - no
> plans for LSM RAID at this stage (although they MAY look at it some
> time down the track for some sort of disaster tolerance). They are
> using Oracle. They don't look like going for a TruCluster Production
> Server at this stage.
>
> We originally were planning to do LSM on top of ADVfs, but it now looks
> like NSIS want to implement a purely ADVfs based system because of the
> perception of added complexity.
I suggest you tell them to install LSM, and place all volumes in
LSM, regardless of whether you plan to use software or hardware raid.
LSM provide a lot if useful information, and the ability to move
data around based on performance or other issues.
What they suggest will work, but will require a harder upgrade later
when you want lsm (either for management, striping, or just gathering
performance data).
See lsm's volstat and voltrace commands for interesting performance
data...
>
>
> Could someone help with some advice on the pros and cons of a LSM based
> DECsafe environment v's an ADVfs one?
I don't think it is an LSM vs AdvFS question...I think your choices
are:
AdvFS alone
or AdvFS using LSM volumes.
I suggest the latter, as it provide more management control, without
major re-install problems later.
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