10000 RPM with 15000 RPM

  • Thread starter Thread starter ali
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A

ali

I have 6 15K RPM Ultra3 36.4 gb SCSI disks and 4 10K RPM Ultra3 36.4
gb SCSI disks. I want to make Raid5 for my server. I want to ask if
there could be a problem and if there won't be any problem, how will
be its performance compared to both 10K RPM and 15K RPM SCSI disks ?
 
Previously ali said:
I have 6 15K RPM Ultra3 36.4 gb SCSI disks and 4 10K RPM Ultra3 36.4
gb SCSI disks. I want to make Raid5 for my server. I want to ask if
there could be a problem and if there won't be any problem, how will
be its performance compared to both 10K RPM and 15K RPM SCSI disks ?
Click to expand...

What contoller? What OS? What filesystem? What application?

Arno
 
What contoller? What OS? What filesystem? What application?
Click to expand...

So many questions.
Why don't you just give him the different details per each brand
of controller, each brand of drive and each model of drive since
you are obviously such an expert, babblebot.
 
ali said:
I have 6 15K RPM Ultra3 36.4 gb SCSI disks and 4 10K RPM Ultra3 36.4
gb SCSI disks. I want to make Raid5 for my server. I want to ask if
there could be a problem and if there won't be any problem,
Click to expand...

What does the manual say.
how will be its performance compared to both 10K RPM and 15K RPM SCSI disks ?
Click to expand...

Presuming you mean "*all* 10K RPM and *all* 15K RPM SCSI "

How does 'inbetween' sound to you?
 
ali said:
I have 6 15K RPM Ultra3 36.4 gb SCSI disks and 4 10K RPM Ultra3 36.4
gb SCSI disks. I want to make Raid5 for my server. I want to ask if
there could be a problem and if there won't be any problem, how will
be its performance compared to both 10K RPM and 15K RPM SCSI disks ?
Click to expand...

Mixing RPMs should not be a problem, since current RAID hardware does not,
AFAIK, use spindle-sync.

I'd guess that performance would show 10K < mix < 15K, but it depends on
other HD params (and the workload and the phases of the moon, etc.) as
well as RPM.
 
ali said:
I have 6 15K RPM Ultra3 36.4 gb SCSI disks and 4 10K RPM Ultra3 36.4
gb SCSI disks. I want to make Raid5 for my server. I want to ask if
there could be a problem
Click to expand...

I recently asked HP this same question, since their 36GB universal
hotplug disks are now only available in the 15k RPM flavour. Their
answer was that mixing disks with different rotational speeds within the
same array was unsupported and not recommended.
 
Mike said:
I recently asked HP this same question, since their 36GB universal
hotplug disks are now only available in the 15k RPM flavour. Their
answer was that mixing disks with different rotational speeds within the
same array was unsupported and not recommended.
Click to expand...

That sounds like business speak for "I don't know why it wouldn't work,
but I'd rather you just bought all new drives."
 
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