Re: Use mixed sizes drives in the same Raid string

Thanks very much to all, at the end it's probably we follow the path of an
expansion unit (around 1.500 euro) plus some " dirt cheap" disks 4326 (35gb
15k). Total cost of swapping 8 disk, double save, system reload and the
risks involved in such operation are not worth the saving of few hundreds
euros.

By the way mixing in the same raid set disks with diffrent capacity is still
not allowed even with more modern controllers?

Thanks again

MarcoF

2010/4/14 <rob@xxxxxxxxx>

I have to agree with the others. 70GB drives are dirt cheap. We just
disposed of a huge quantity of them and what we got for them wasn't much.
Granted, the horse trader has to make a little profit. With all the labor
involved, replace them all with 70's.
Besides, aren't the 70's 15K drive speed and the 35's only 10K drive
speed?
http://www-947.ibm.com/systems/support/i/planning/upgrade/futurehdwr.html
<snip>
Although IBM plans to support all existing i5/OS 15k rpm disk drives and
the i5/OS 10k rpm 35.16GB disk drive on POWER6 based System i models, it
is generally recommended for better performance that customers use 15k rpm
disk drives where possible. The 10k rpm 35.16GB disk drive is represented
by feature code #4319/#7501 or CCIN #6719.
</snip>


Rob Berendt
--
Group Dekko Services, LLC
Dept 01.073
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From: Marco Facchinetti <marco.facchinetti@xxxxxxxxx>
To: midrange-l@xxxxxxxxxxxx
Date: 04/14/2010 06:57 AM
Subject: Use mixed sizes drives in the same Raid string
Sent by: midrange-l-bounces@xxxxxxxxxxxx



I'va a customer using 87% of the installed disks (246 Gb) so I have to
find
how to increase the total amount of disk space without an expansion unit
(no
available slots for new disks).

The machine is a 9405-520, the controller a 573D-001 with 8 disks (4326),
Raid5 is active. Total available space is 246 Gb.

My 1st question: may I mix in the same raid set drives with diffrent
capacity (eg. 36 and 70 gb)?

If posssible should I expect any perfomance problems?

If not possible should I split the raid in two strings (eg. 4x4326 and
4x4327) or I must change all the drives?

Any suggestion is much appreciated.

TIA

MarcoF
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