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Perc H700 (PowerEdge T310) Low Disk Size in RAID 5
Hi,
We have a PowerEdge T310 with a Perc H700. 4 drives are in RAID 5 (3x 465GB and 1x 931GB).
According to all the online RAID calculators I've tried (links below), we should have at least 1395GB of storage on the virtual volume [According to this formula : (465-(465/4))*4 ]. We only have half that amount available: 696.75GB
How's that possible?
Right now one of the drive is degraded (will replace it soon), but it shouldn't affect the virtual volume size right?
Online RAID calculators:
rdconfigurator.netgear.com/.../index.html
www.synology.com/.../RAID_calculator
Any ideas?
gogo togo
25 Posts
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August 10th, 2016 08:00
I know, it's weird right?
Here are some screenshots:
theflash1932
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9 Legend
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16.3K Posts
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August 10th, 2016 08:00
The only way that is possible is if whoever configured it configured it with less than the maximum disk space.
For example, you can have 4x2TB in RAID 5 and create a VD with only 100GB for the OS and a VD with the remaining 5.9TB for data. If you never configure that second VD, it will never be presented to the OS.
Even a 3x500GB RAID 5 would be nearly 1TB in size, so that 696GB isn't standard for any arrangement of disks, unless the drives were possibly replaced with larger ones at one point.
Are you sure all 4 disks are in the same array/VD? and that the 1TB isn't a separate disk/VD for backups/mirroring/etc.? Can you post a screenshot of the Virtual Disks page in OMSA?
You might also check Windows Disk Management - if there was another VD created but never initialized/formatted, then it would not appear as available space.