Maybe it's been too long since I last had my hands on ADSM (or TSM), but I
don't think this is right.

Although a client won't have a tape to itself, TSM should keep all of any
given client's files on the same tape if possible. While this will cause
more tape mounts during migration from disk pools to tapes, it *does* speed
up recoveries, which is the traditional reason for colocation!

Just a thought,
Nick

> -----Original Message-----
> From: Lawrence Clark [mailto:Larry_Clark AT THRUWAY.STATE.NY DOT US]
> Sent: Friday, January 26, 2001 9:30 AM
>
> I'm not sure there would be any advantage to setting on
> colocation when you have 300 cartridges and 1400 clients,
> since the number of cartridges could not satisfy the
> requirements. TSM will place the files from the nodes on all
> the tapes.
>
> If there were an advantage to having some of your nodes
> colocated you could create a separate domain/management
> class/target storage pool and set the maxscratch high enough
> to satisfy the number of nodes assigned to that domain.
>
>
>
> >>> paulbaines AT GMX DOT DE 01/26/01 05:58AM >>>
> Hello,
>
> We are running a 3494 library serving, among others, some
> 1400 NT servers.
> These servers occupy on average 2 Gb in a non-collocated
> storage pool. We
> want/need to switch on collocation at a node level for these
> clients, but I don t
> want to let them collocate on 1400 30-50Gb 3590s. How do
> people manage the
> use of their collocated storage pools? Do you set
> maxscratch=0 and just define
> volumes to the storage pool? What if I ve got 1400 clients
> and 300 tapes?
> Does collocation work properly if you limit the number of tapes?
> If I have 2700Gb and 2Gb per client then :
>
> 5 clients / tape        10 Gb / tape    = 270 tapes
> 6 clients / tape        12 Gb / tape    = 225 tapes
> 7 clients / tape        14 Gb / tape    = 192 tapes
> 8 clients / tape        16 Gb/ tape     = 168 tapes
> 9 clients / tape        18 Gb / tape    = 150 tapes
> 10 clients / tape       20 Gb / tape    = 135 tapes
>
> OK, these are idealised averages, but how are you doing it?
> How full or how
> many clients do you have on collocated storage pool tapes?
>
> Ta in advance for any comments,
> Paul.
>
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