topic Re: EVA Information in HPE EVA Storage

EVA Information

toni osta — Sun, 14 Sep 2008 15:36:58 GMT

Hi ,

I have an EVA6100 with 300GB * 40 Disk drives , 2C4D ,
i have given level protection one of one disk group that contain all 40 disks , in case i am using VRAID5 to create my Virtual disks what wil be my total usable space

thank you

Re: EVA Information

Uwe Zessin — Sun, 14 Sep 2008 16:41:46 GMT

About 8.48 Software TeraBytes:

300*38/1.25/1.024/1.024/1.024 -10 = 8483.66

Re: EVA Information

IBaltay — Sun, 14 Sep 2008 17:57:18 GMT

Hi,
this older EVA3000 presentation
www2.openvms.org/kparris/eva_intro.ppt
(the virtualisation theory did not changed)
shows the following:
a) EVA RAID1 and RAID5 algorithms (slides 9-10)
b) net capacities examples (slides 14-16)

In your case:
raw capacity =12000GB
metadata (slightly more than 20GB per disk, here down-rounded) = -800GB
single disk protection (2x300GB)= -600GB
RAID5 (4D+1P) =/1.25
=============================================
= 8480GB
DG occupancy level e.g. 90% = -848GB
Total usable approximation = 7632GB

Re: EVA Information

IBaltay — Sun, 14 Sep 2008 18:10:17 GMT

But maybe the most flexible for you is to play with the storage sizing tool to see all your potential configurations and their capacity demands:
http://h30144.www3.hp.com/SWDSizerWeb/

Re: EVA Information

Rob Leadbeater — Sun, 14 Sep 2008 18:25:36 GMT

Hi Toni,

You can also get this information using the StorageWorks Sizing Tool, available here:

http://www.hp.com/go/nsssizer

Cheers,

Rob