Raid 4 Db?

waqar · 03-05-2006, 10:20 PM

hello to all of u.
hope all of u will be fine.
i am very thankful to u people for answering for my questions.

but my second question is still not answered.

Q:what will be the performance of RAID 4 DB(dual parity) on solaris having 3 or more hard disk.
i want to know in detail i.e.READ/WRITE,I/O Performance,BACKUP,DATA TRANSFER RATE,ETC ETC. Plz somebody send me details.

THANKS
waqar.

Brian Knoblauch · 03-06-2006, 03:41 AM

Need more details on your system. It depends on a lot of factors.

apt-get-dude · 03-26-2006, 08:32 PM

raid 4? No such thing. Do you mean raid 5 with 4 drives? if raid 5 with veritas or solstice disk suite/solaris volume manager (or whatever they will call it next), don't use it. 0+1 or 1+0 are better for performace (w r i t e s that is)
Capish?

javier.e.menendez · 03-26-2006, 08:49 PM

Wakar, you never mentioned if you are using hardware raid or software raid. But you are probably confusing the terms here.

Let's say you are using vxvm for instance. They support raid 0, 1, 0+1, 1+0 and 5. The "capish dude"

is right. No such thing there. If you have hardware raid, for instance, the t3/t3bs don't support that also. smc will even show you (at the software level) that if you click on enhanced storage and you try to create a raid device that "4" is not a valid choice.

Hoping it helps.

jlliagre · 03-26-2006, 11:36 PM

Quote:

Originally Posted by apt-get-dude

raid 4? No such thing.

Well, it exists in theory, although seldom implemented.
http://en.wikipedia.org/wiki/Redunda...t_disks#RAID_4

apt-get-dude · 03-27-2006, 05:29 AM

It may (and does) exist in theory but it is not supported by Sun. So there.

jlliagre · 03-27-2006, 05:54 AM

Capito, Sun doesn't, neither Veritas.
Still in theory, a third party ISV may want to support it, and the OP didn't specify the software used ...