On Thu, 16 Feb 2006 [log in to unmask] wrote:
> Hi Henry,
>
> as a sys admin it is not important but users might care to have different
> type of data on different type of storage. i.e. "my ntuples on raid5,
> experiment data on disk".
Why? - making some hardware-related assumptions tells them little about
the actual performance or persistence of their data (they haven't seen our
IDE RAID arrays :( )
And anyway an SRM can have multiple pools with different storage types, so
a single value is meaningless. IMHO this sort of thing should be published
somewhere like the infamous GlueSAFileLifeTime or GlueSAType with a
vocabulary along the lines of scratch/medium/longterm/archived[*] - if the
user needs more details then there's a need for a finer-grained
information system, rather than guesswork by psychic users.
> >> SE_ARCH="multidisk"
> >> So we can expect that this is correct.
>
> how do you define resilient dcache multidisk or disk?
How do you define a DPM'd ex-classic_SE with both a single internal drive
and a mounted RAID array?
Thanks
Henry
[* deliberately not the internal SRM terms]
> cheers
> alessandra
>
>
> On Wed, 15 Feb 2006, Henry Nebrensky wrote:
>
> > Obviously I wasn't there; sorry if this retreads long discussion:
> >
> > On Wed, 15 Feb 2006, Owen Synge wrote:
> >
> >> Minutes of storage phone conference 15 Feb 2006
> > ...
> >> 4. AOB
> >> Should YAIM field SE_ARCH be populated with "multidisk" for Raid systems?
> >> We suspect this is the case. the options are
> >> "disk, tape, multidisk, other"
> >> and the default is
> >
> > Where does this value end up being used - it looks like something for the
> > information system?
> >
> > [As an end user, the technology underlying a single filesystems isn't
> > particularly relevant; OTOH if the SE is a front-end to several separate
> > disk volumes/partitions, then "total free space" won't be the same as
> > "biggest file that can be uploaded" which is kinda important!]
--
Dr. Henry Nebrensky [log in to unmask]
http://people.brunel.ac.uk/~eesrjjn
"The opossum is a very sophisticated animal.
It doesn't even get up until 5 or 6 p.m."
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