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05-01-2013 12:56 AM
05-01-2013 12:56 AM
HP Smart Array - RAID and Logical Arrays
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
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05-06-2013 12:07 AM
05-06-2013 12:07 AM
Re: HP Smart Array - RAID and Logical Arrays
Have you found an asnswer from any source to your question?
I don't know, wich is faster.
But from a security point of view, I would say option B.
Option A:
All data is on all and the same disks. When you create 3 logical drives on an array, its like when you partition a single disk.
You will have LD 1, at the bottom, LD 2 at the mittle and LD 3 at the top.
In case of a disk failure, LD1 wil be rebuild first, then LD 2 and finally LD 3.
If you suffer from a catastrophic disk failure, all is lost.
BR
/jag
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05-08-2013 09:00 AM
05-08-2013 09:00 AM
Re: HP Smart Array - RAID and Logical Arrays
Or even better, an additional array controller, so you'd have one for the OS and the other for your databases.
You should see a nice performance boost then...
I'd definately configure a spare with all those disks, maybe even two.
A spare can be assigned to multiple arrays / logical drives at the same time so it'll cut in for any disk that fails in any logical drive configured on the same controller.
Thanks
Mark...
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