Steven,
I connected 32 GB disk to 1 Wide/Fast-20 SCSI and the read/write
operations performed as expected. I can write at 12MB/sec (9 MB/sec on
SSA) and read at 18 MB/sec (12 MB/sec SSA). Considering that my
disk-pools currently aren't mirrored nor raided on SSA disks, I think
I'm going to move them on the RAID-5 VSS and use the SSA disks for DB
and LOG volumes only.
Seeya
Mauro, STM
> Mauro,
>
> we did have the VSS, but due to problems with it, an other factors we did a
> deal and got the ESS. Our ADSM server is a Silver Node in an SP, we have 5
> 3590
>
> Magstar drives attached, with a StorageTek Silo. To get comparable SSA
> throughput from the VSS we had 3 seperate SCSI connections, Ultra-Scsi to
> Scsi2
>
> Fast Wide. This was when we only had 3 Magstar drives. We split the disks
> across the three seperate connections, remembering the cross cluster
> dependency
>
> that IBM recommend with the VSS, ie the bays under Cluster0 are managed better
> by Cluster1.
>
> Write speed was OK, but this was probably due to the Cache that the VSS
> utilises to improve write performance. Read speed was slower then native SSA,
> but I'm not sure how important this is to the ADSM. I suppose it depends on
> what thresholds you have set on the disk-pool for the copy off to tape.
>
> Give me a shout if their is anything else you need to know.
>
>
>
>
> Steven Eyre
>
> x8663
>
>
>
>
>
>
> Mauro.TINELLI AT st DOT com on 01/07/2000 10:52:09 AM
> To: Steven Eyre/PSD/LONDON/FTI@FTI
> cc: ADSM-L AT VM.MARIST DOT EDU
>
> Subject: Re: ADSM and IBM Enterprise Storage Server (Model 2105-E20) as
> Disk pool
>
>
> Steven,
>
> I haven't at the moment, but I thought to do the same in order to
> allocate all the SSA storage for the DB. Which ESS are you using? Shark
> or VSS (... I have a VSS) which SCSI adapter? I'm going to attach and
> test it next week.
>
> Ta Mauro, STM
>
> > Hi,
> >
> > does anybody have any experience of using the ESS attached via SCSI 2
> FW to a
> > Risc 6000 acting as the ADSM Server.
> >
> > We currently use native SSA for the disk pool, but are looking to move
> the the
> > ESS which uses 6GB of cache, and then Raid 5 on enhanced SSA. We are
> getting
> > comparable write to disk speeds, but the read is a magnitude slower,
> which
> > impact the copy off to tape. Has anybody any experience of this, and
> if so
> > what have they done to improve the throughput.
> >
> >
> > Cheers in advance.
> >
> > Steven Eyre
> > Unix Systems Administrator
> > Financial Time Information
> > 13-17 Epworth Street
> > Epworth House
> > London
> > EC2A 4DL
> > United Kingdom
> >
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