Some basic HP Smart Array questions

Hopefully a simple answer to what seems to be a fairly simple question...
If, for example, you have a P800 HP Smart Array with 24 disks and a spare and you want to partition a number of database files across drives to maximise I/O performance (the transaction log file is heavy on writes and the other data and index files are heavy on reads), would it be better to:-
a) Use the 24/25 disks to create one SAS Array and three logical drives:-
SAS Array A with spare - 3 Logical drives
     Logical Drive 1 (1200 Gb, RAID 1+0)
     Logical Drive 2 (1200 Gb, RAID 1+0)
     Logical Drive 3 (1200 Gb, RAID 1+0)
b) Use the 24 disks to create three SAS arrays each with one Logical Drive:-
SAS Array A & Logical Drive 1  (1200 Gb, RAID 1+0)
SAS Array B & Logical Drive 1 (1200 Gb, RAID 1+0)
SAS Array C & Logical Drive 1  (1200 Gb, RAID 1+0)
Not sure how the Spare disk fits into Option B?
Anyway, if the objective is to maximize I/O performance, is it Option A or B?
The phrase, 'logical drive'... Does this mean that I/O is partitioned at the logical drive level or does the HP Smart array controller spread the I/O across the SAS Array? If I look at I/O counters (eg. Perfmon on Windows Server), I can see that Logical drives as in Option A seem to be separated completely as one logical drive could have a disk queue and other logical drives on top of the same SAS array will not have a disk queue.  What are the prose and cons of Option A and B? Understanding these issues will help me to come up with the right configuration in terms of arrrays and logical drives.
Thanks in advance,
Clive

Hi, Clive:
I'm not so sure yours is a fairly simple question for the HP consumer notebook forum.
You may want to copy and paste your post in the HP Business Support Forum -- Disk Array section.
http://h30499.www3.hp.com/t5/Disk-Array/bd-p/itrc-195

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> Hello all,
> I have some basic questions on XI and File Adapter
> and hope you can help me. Any answer is appreciated.
>
>
> 1. Can I use NFS transport protocol to poll a file
> from a machine in the network, which is not the XI?
yes
> Or do I have to use FTP instead?
>
also you can do it
> 2. If I understand it correctly - when using the
> FTP-File Adapter, XI has the role of a ftp client. I
> have to run a ftp server on my distant machine. XI
> connects to FTP-Server and polls the file.
> Can it also be configured the other way round? The
> scenario I think of would be: FTP client installed on
> distant machine, which connects to FTP-Server(XI) and
> loads up a file. So XI would act as FTP Server.
> I know this works, if I install a ftp Server on the
> computer my XI runs on, and use the NFS-File Adapter
> to observe the folder. But I want to know, if I need
> a second, independant ftp server for this.
>
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Edited by: Anindya Chatterjee on Apr 25, 2012 3:50 AM

>
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...well, it is a northern D - they call us often "Fischköpfe" because we love to eat fish here in Hamburg!
I just have summarized a bit the storage configuration I am thinking of
RAID Type
Objective
System requirements
RAID level
Offline Storage
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doesn't need to be extremely fast;
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10
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10
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1
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as fast as possible
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0
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number of discs
Type
GB/disc
tot. storage [GB]
usable storage [GB]
cost [€]
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8
SATA
1500
6000
4800
900
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300
900
720
2100
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2
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36
30
200
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4
SCSI/SAS
147
580
470
1000
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maxys wrote:
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