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Disk Arrays
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Time to Expand an Array

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Andrew McLean_2
Occasional Contributor

Time to Expand an Array

I have a 3x72Gb raid 5 array in a ML350G3 which I have added a forth 72Gb drive to. I have set the controller configuration so that the priority on expanding the array is set to high. How long should it take as I started it on Saturday morning and it is now Tuesday and it is still expanding.
3 REPLIES
Uwe Zessin
Honored Contributor
Solution

Re: Time to Expand an Array

Andrew,
I have read something about 15 minutes per GigaByte on an otherwise idle controller.
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Andrew McLean_2
Occasional Contributor

Re: Time to Expand an Array

Thanks for that, given that the disk is hardly idle, I should expect it to take a few more days. I assume that the 15min per Gb is pysical size of the hard disk and not the amount of data currently stored on the disk. Thanks again.
Uwe Zessin
Honored Contributor

Re: Time to Expand an Array

Sure, RAID controllers present a list of logical blocks to the host - they don't have an idea of what a filesystem is. Some advanced controllers like the EVA maintain a map of which 'segments' of a virtual disk have data written to and use this knowlege to optimize replication or snapclones, but that does require additional ressources in the system.
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