Raid 5

[Gaurav Mishra]

Hi,

What is the Raid 5 & what are the benefits ?

Raid 5 is LVM is better then Raw Partitioned ?

Regards,
Gaurav Mishra

[pierre merle (36957)]

Hello,

RAID5 is a way to increase avaibilitys of datas.
As mirroring is disk expensive (mirroring is copy to another device all
transactions as you get two identical devices, if one fail the other is
still on line).
RAID5 is similar but spread informations in chunkns like strippng (which
means spreading informations on mulltiples disks at the same time to
improve speed of transactions) but use
also a parity bit on the last device.
To have thins more complicated the pariy device turn regulary as you
don't have a special parity device BUT parity is also spreaded on all
disks.
The RAID5 permits onlt 1 single failure per volume/metadevice.

For more informations you should have a look here :
http://docs.sun.com/ab2/@LegacyTocView?toc=SUNWab_68_1%3A%2Fsafedir%2Fspace3%2Fcoll1%2FSUNWabmd%2Ftoc%2FDISKSUITEADMIN%3ADISKSUITEADMIN%3Aclose

And the choose RAID or wathever you want to know.
It explains everything.

rgds,

Pierre

[Mike Cush]

I would also like to add that running RAID 5 in software is probably
not the preferred method - this will chew many CPU cycles calculating
the parity - especially if you lose a disk and a rebuild is activated.

Run hardware RAID 5, in something like a StorEdge A1000.

Hope this helps.

-- Mike

"pierre merle (36957)" wrote:

--
Mike Cush
Vice President Technical Services Division
Resource One Computer Systems, Inc.
278 North 5th Street
Columbus, Ohio 43215
(614) 241-5800