Size of "hot spare disk" for SSA RAID5 ?

[TSch]

Hi folks,

we're using 4 4.5 GB Disks for an SSA RAID5 Array and want to extend it witha hot spare disk...

Is it necessary to choose a disk the same size (4.5 GB) for hot spare or is it possible to choose a larger disk ? Does it make any sense to do so ?

Regards
Thomas

 

[AIX5L]

Hi

It must be the same Size.
We prefer to use only the same Size of Disks in a RAID Array

 

[MoshiachNow]

Hi,

My experience with Raids shows that in all cases a bigger disk also does the job - normally the controller formats it to a standard size,as needed per system.

Smaller disk is the real problem !! "Long live king Moshiach !"
h

http://www.noahide.com/movement.htm

 

[TSch]

Hmm...

Let's say we would use an 18.2 GB disk for hot spare in a raid system containing several 4.5 GB disks ...

Wouldn't we be wasting over 14 MB disks space that way ?
If so, could we say that it is possible to use larger disk but not always wise or is there any advantage we would have by using a disk thats significantly larger for hot spare?

Regards
Thomas

 

[MoshiachNow]

Yes,

It is a waste,and we do it only when weare stuck without a proper disk size. "Long live king Moshiach !"
h

http://www.noahide.com/movement.htm

 

[nam0211]

Using Big size disk doe't not make any sense. It always better to use same size of the disk . Even Raid may misbehave in the case of one disk fails.

 

[bonsky]

yeah i agree, ir makes no sense, and i believe it would be more expensive to buy higher capacity disk, except that you have no choice coz IBM withdrawn this certain part number, too bad for you then.

 

[MoshiachNow]

Right,It makes no sense,UNLESS this large disk is the only one available at this momemnt,and I badly need a spare disk. "Long live king Moshiach !"
h

http://www.noahide.com/movement.htm