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тАО06-23-2007 07:07 PM
тАО06-23-2007 07:07 PM
VRaid 5 in EVA 3000
I am using EVA 3000, in that i am having 8 Disk each of 145.6GB, i am using VRaid5 for Virtual Disk, finally i am able to use only 605 GB, Why? Can anyone Explian me
Thanks & Regards
Prabhu
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тАО06-23-2007 08:34 PM
тАО06-23-2007 08:34 PM
Re: VRaid 5 in EVA 3000
In an EVA configured with single sparing, the size of 2 of the largest disks in a disk group are allocated for sparing information.
A 146GB disk is actually only ~139GB when you convert marketing GB to real GB.
Therefore space in your disk group would be (8 - 2) x 139 = 834GB.
VRaid5 can use up to 0.8 (four fifths) of that space, so you should have around 667GB available.
Hope this helps,
Regards,
Rob
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тАО06-24-2007 02:44 AM
тАО06-24-2007 02:44 AM
Re: VRaid 5 in EVA 3000
Thanks & Regards
Prabhu
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тАО06-24-2007 03:07 AM
тАО06-24-2007 03:07 AM
Re: VRaid 5 in EVA 3000
What is the sparing level set to on the Disk Group ?
Are there only the 8 x 146GB disks in the Disk Group ?
Are there any other Vdisks already in the Disk Group ?
Cheers,
Rob
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тАО07-02-2007 01:32 AM
тАО07-02-2007 01:32 AM
Re: VRaid 5 in EVA 3000
(8 Disks minus 1 for sparing) * 136.73GB (raw size) * 0.75 (RAID 5) * 0.90 (protection level)
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тАО07-02-2007 04:38 AM
тАО07-02-2007 04:38 AM
Re: VRaid 5 in EVA 3000
(8-2) * 136.73 = 820GB available space.
VRAID 5 is 4+1 or 80% efficient, so you should be able to get 656 GB at 100% occupancy, which HP does not recommend.
Is there a 64 GB VDisk already created in the group?