Performance issue if we have server with disks of varying capacity on iSeries server

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AS/400
iSeries
Will there be performance issue if we have server with disks of varying capacity on iSeries server?


Software/Hardware used:
i Series Hardware
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Currently we have server with 139 GB disks, since we are falling short on storage.  We would like to replace certain 139 GB Disks with 283 Disks.  Will this cause performance issue on the server is the question.

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  • GregManzo
    The short answer is 'probably not'. Just adding more disk can't hurt, replacing small for big on a 1-for-1 should be ok. Reducing the total number of drives might hurt depending on the access speed difference, but if you are short of space you prob don't want to do that anyway.
    You main concerns should be (a) number of disk arms, and (b) access speed of the disks. A small number of big disks can cause a bottleneck in a very active system. On the other hand a large number of small disks increase you risk of a disk failure. Try to find a balance.
    Also, you will need to think about your RAID config - make sure the new drives are in the same RAID set(s) for compatibility. You are using RAID, aren't you?
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  • ToddN2000
    It may cause a problem if your system is RAID configured. The reason RAID is popular it allows you to replace a drive on the go. If a drive with a different capacity fails the system may not be recoverable. More info is needed on your current configuration (RAID and OS version)
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  • Splat
    As long as the 283 GB disks are all in the same array you should be okay.  I don't think you can mix disk sizes within an array.
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