Thanks for the ideas!!!
Raid 1 is faster, good news, but is it possible to know how many times
faster it is?

Do you have any metering informations such as:
             Max number of I/O per sec,
             Service time in ms,
             or others
This can help to estimate the 'potential' of the new config.

Today we can see with GLANCEXL something like no more than 50 I/O/s on a
single LDEV
with service time UP to 1.5 and not less than 0.0170 and queue UP to 900
pending I/Os!!!

Any perf  info on HP's AutoRaid?

Best regards
Marc

----- Original Message -----
From: <[log in to unmask]>
To: <[log in to unmask]>
Cc: <[log in to unmask]>
Sent: Friday, March 17, 2000 9:49 AM
Subject: Re: DISK perf info needed


>
>
> Marc,
>
> RAID 1 is faster but a little more "disc wasting" of course.
>
> I'd like to recommend
> LDEV 1         2 * 4.2   RAID 1          4.2 net
> LDEV 2         2 * 4.2   RAID 1
> LDEV 3         2 * 4.2   RAID 1
> LDEV 4         2 * 4.2   RAID 1
> LDEV 5         2 * 4.2   RAID 1
> and so on (you have 20 disks ...)
>
> Advantage: a lot more spindles on seperate devices - this helped us a lot
when
> we had disc bottlenecks on large HP-FL disks in the past - we moved to 2
GB SCSI
> disks with Mirroring on Priv.Vol - and the looked fine.
> The same expereince was made when we installed for test purposes a new
LDEV 1 (2
> * 2 GB RAID 1) on Model 10 - now the old HP-FL will become a bottlenecks
... so
> that we're planning to replace with Model 10 as well.
>
> Disadvantage, of course: you will loose some potential disk capacity ...
(RAID
> 1)
>
> I do not know how Model 20 will work with a hot spare but this is an
option on
> Model 10 as well ....
>
> Just another idea,
> Best regards, Andreas Schmidt, CSC
>
>
>
>
>
> [log in to unmask] on 16/03/2000 07:17:47 PM
>
> Please respond to [log in to unmask]
>
> To:   [log in to unmask]
> cc:    (bcc: Andreas Schmidt/GIS/CSC)
> Subject:  DISK perf info needed
>
>
>
> We have a HP3000 969KS220 connected to an external Model 20 Disk Array.
> We are looking for very precise performance informations and guidelines on
> how to configure this config for best performance.
> Actually we have this config:
> SPA : Ldev 1 = 2* 4.2 disks in Raid1
>
> SPB : Ldev 2 = 4*4.2 disks in Raid5
>           Ldev 3 = 4*4.2 disks in Raid5
>
> All good ideas are welcome.
>
> Marc GOLDSTEIN
> Groupe BATIGERE
> METZ
> FRANCE
>
>
>
>
>
>
>