topic Re: XP512 Array Groups - Size in Disk Enclosures

XP512 Array Groups - Size

Jo Minter — Fri, 16 Aug 2002 14:36:56 GMT

We have an XP512 and I'm about to order an array group. Is the 73 GB array group actually 73 GB in size or does it have 4 73 GB disks in it?

Re: XP512 Array Groups - Size

Vincent Fleming — Fri, 16 Aug 2002 18:20:45 GMT

It has 4 drives.

Re: XP512 Array Groups - Size

Insu Kim — Mon, 19 Aug 2002 10:06:14 GMT

Disk are always sold in groups of 4 drives, called array groups or marketing groups.

Hope this helps,

Re: XP512 Array Groups - Size

Jo Minter — Mon, 19 Aug 2002 13:12:52 GMT

I know it has 4 drives, but are they each 73 GB or does the total size for the array group (4 x X) equal 73 GB?

Re: XP512 Array Groups - Size

Insu Kim — Mon, 19 Aug 2002 22:35:37 GMT

They're each 73GB so the total size for the array group would be 4 x 73GB.

Re: XP512 Array Groups - Size

Jo Minter — Tue, 20 Aug 2002 12:38:12 GMT

Thanks, that's exactly what I needed to know!

Re: XP512 Array Groups - Size

Dave Wherry — Tue, 20 Aug 2002 12:42:08 GMT

You will not get 4 x 73GB usable space. The usable space depends on which Raid you choose, 1 or 5, and the emulation you choose. The emulation is how the drives are partitioned. I can't find my chart right now, but as an example, if you had 47GB drives, choose Raid-5 and Open-8 emulation you would get 19 LDEVs, each about 7GB in size for a total usable space of around 130GB.
The are more emulations available now than the chart I have shows so check with HP and they can give you the current information.
Raid-5 will give you more usable space.