topic Re: VA disk space in Disk Enclosures

VA disk space

Lee Huei — Thu, 20 Nov 2003 21:38:34 GMT

Hi all,

I have a query on how VA utilising its harddisk.

I have a VA with 4x36Gbytes hdd
out of the total hdd size, only 40Gbytes of harddisk space is available, the rest are reserved for hotspare & redundancy.

Understand that this is how VA configuration works.
could anyone help explains in detail how the disk space being configured for redundancy & hotspare?

Thanks in advance :)

Re: VA disk space

Adisuria Wangsadinata_1 — Thu, 20 Nov 2003 23:22:17 GMT

Hi there,

the hotspare & redundancy is the features for HA performance, this can be disable BUT you must say 'bye-bye' for the HA features on your VA 8-).

other information about this will be send directly to you.

Best Regards,
AW

Re: VA disk space

Lee Huei — Thu, 20 Nov 2003 23:24:00 GMT

Thanks. The information sent directly to me helps a lot and clear all my doubts :)

Re: VA disk space

Adisuria Wangsadinata_1 — Thu, 20 Nov 2003 23:27:57 GMT

The information from docs.hp.com :
goto 'Storage Solutions'
goto 'Storage Area Management'
goto 'hp virtual array systems'

Hope this information can help you also.

Best Regards,
AW

Re: VA disk space

Steven E. Protter — Thu, 20 Nov 2003 23:32:07 GMT

It is possible to set up all four disks and present them to the OS. Then if you have it, you can use mirror/us software redundancy. You won't get quite as much space as the standard VA radi setup, but you'll get great performance and reliablity.

SEP

Re: VA disk space

Peter Mattei — Mon, 24 Nov 2003 03:00:19 GMT

Uups, you missed the point that the VA has a built in RAID controller. You cannot present disk directly by bybassing the controller.
You probably think of a DS2405 which can be used by a VA7410 as extension unit only!

Cheers
Peter

Re: VA disk space

Sijesh — Fri, 12 Mar 2004 17:11:09 GMT

VA got 2 RAID levels RAID1+0 and AutoRAID.
(Default is AutoRAID).Avilable space depends on RAID level

Also it uses some disk space for its 'maps'.

Sijesh

Re: VA disk space

Uwe Zessin — Sat, 13 Mar 2004 05:03:13 GMT

I don't think that is correct, Sijesh.

The 'hp StorageWorks virtual arrays va 7000 -family user and service guide' (A6183-96005) from January 2003 says it is the other way.

The array can be changed from RAID 1+0 to AUTORAID online, but a switch in the other direction requires a complete reformat of the array. RAID-5DP is more space efficient than RAID 1+0. It is pretty unlikely that there is enough space in an array for such a switch once it has started migrating data to RAID-5DP.