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тАО09-09-2009 04:30 AM
тАО09-09-2009 04:30 AM
(I see that XCS code needs to be upgraded)
Is it neccessary to upgrade the code on th mpx unit as weell?
-inex
Solved! Go to Solution.
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тАО09-09-2009 04:51 AM
тАО09-09-2009 04:51 AM
SolutionXCS 6.110 is currently out of support so you should update anyway.
Yes, you can ungroup 500 GB FATA drives and replace them by 1 TB FATA drives
The space will not grow by 14x500 GB, the mathematics are more complex and depend on how the RSS groups end up.
Updating the firmware on the iSCSI router is always a good idea, but not related to this.
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тАО09-09-2009 05:22 AM
тАО09-09-2009 05:22 AM
Re: EVA4000 and 1TB fata drives
The have single failure protection level. How can we calculate approx. what extra space we will get if we repalce 14 of the drives with 1TB disks?
-inex
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тАО09-09-2009 09:52 AM
тАО09-09-2009 09:52 AM
Re: EVA4000 and 1TB fata drives
In the worst case you LOSE ONE TeraByte !!
That is true when each 1TB disk drive is 'married' with a 500GB disk drive. The protection space still grows from 1TB to 2TB.
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тАО09-09-2009 12:06 PM
тАО09-09-2009 12:06 PM
Re: EVA4000 and 1TB fata drives
I thought maybe this would give brutto (14 x 1TB) - (14 x 500GB) - 1TB (ekstra for the spare)
-inex
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тАО09-09-2009 10:40 PM
тАО09-09-2009 10:40 PM
Re: EVA4000 and 1TB fata drives
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тАО09-10-2009 03:28 AM
тАО09-10-2009 03:28 AM
Re: EVA4000 and 1TB fata drives
No, it's not that simple. Internally the disks are divided in groups of 8 (RSS) and the RAID information is distributed among these sub-groups.
Typically each RSS will only have 1 or 2 1TB disks. The controllers will try to fill those disks with as much data as possible but without losing redundancy.
This will lead the the 1 TB disks not being filled as much as you expect, so the total avaiable space will be less than that formula.
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тАО09-10-2009 03:40 AM
тАО09-10-2009 03:40 AM
Re: EVA4000 and 1TB fata drives
As far as I can tell, there is no optimization code in the controller firmware, so you can even LOSE FREE/PROTECTION capacity during such a reorganization if a large disk drive gets married to a smaller one.