[THIN] Re: mini-poll: mirrored disk or page file on a seperate disk?
- From: "P.J. Johannsen" <pjohannsen@xxxxxxxxxxx>
- To: thin@xxxxxxxxxxxxx
- Date: Thu, 12 Dec 2002 13:27:17 -0700
I agree with you, Joe. I have run the Compaq SmartStart on DL360s with two
drives and they default to 0+1. However, my traditional understanding of
RAID is that 0+1 should be a mirrored array. (Two or more drives times two)
I would be interested in knowing the reason for the 0+1 specification with
two drives as well.
PJ
>From: "Joe Shonk" <JShonk@xxxxxxxxxxxxxx>
>Reply-To: thin@xxxxxxxxxxxxx
>To: <thin@xxxxxxxxxxxxx>
>Subject: [THIN] Re: mini-poll: mirrored disk or page file on a seperate
>disk?
>Date: Thu, 12 Dec 2002 07:09:46 -0800
>
>
>Again, how is this possible with only two drives? Raid 0+1 is a two =
>strip sets mirrored. A strip set would require 2 drives, and to mirror =
>them 2 more. Thus 4 drives... Setting Raid 0+1 on 2 drives is just =
>Raid 1.
>
>Joe
>
>-----Original Message-----
>From: Ziots, Edward [mailto:EZiots@xxxxxxxxxxxx]
>Sent: Thursday, December 12, 2002 6:52 AM
>To: 'thin@xxxxxxxxxxxxx'
>Subject: [THIN] Re: mini-poll: mirrored disk or page file on a seperate
>disk?
>
>
>
>I have done this with Compaq Smart Start, with a system with 2 drives. =
>It
>defaults to RAID0+1 which is a stripped Mirror. Note I didn't say with
>parity...
>
>EZ
>
>-----Original Message-----
>From: Joe Shonk [mailto:JShonk@xxxxxxxxxxxxxx]
>Sent: Wednesday, December 11, 2002 5:40 PM
>To: thin@xxxxxxxxxxxxx
>Subject: [THIN] Re: mini-poll: mirrored disk or page file on a seperate
>disk?
>
>
>
>Huh? How do you do RAID 0+1 with only two drives? You need 4 drives =
>=3D
>for that, the blades only allow for two.
>
>In any case, server class raid controllers generally support RAID 10 =3D
>over 0+1. RAID 10 is a little better that 0+1.
>
>Joe
>
>-----Original Message-----
>From: Ziots, Edward [mailto:EZiots@xxxxxxxxxxxx]
>Sent: Wednesday, December 11, 2002 2:56 PM
>To: 'thin@xxxxxxxxxxxxx'
>Subject: [THIN] Re: mini-poll: mirrored disk or page file on a seperate
>disk?
>
>
>
>Defintely RAID 0+1, with page file as normal. Just make sure you size it
>1.5X Physical memory.=3D20
>
>EZ
>
>-----Original Message-----
>From: Joe Shonk [mailto:JShonk@xxxxxxxxxxxxxx]
>Sent: Wednesday, December 11, 2002 4:34 PM
>To: thin@xxxxxxxxxxxxx
>Subject: [THIN] Re: mini-poll: mirrored disk or page file on a seperate
>disk?
>
>
>
>Definately A... B will not give you extra performance. Keep in mind =
>=3D
>=3D3D
>that the Raid controller can read off of both disks in a RAID 1 senario.
>
>2GB should be good. Depends on how resource intensive your apps are.
>
>Joe
>
>-----Original Message-----
>From: Charles Morrall [mailto:Charles.Morrall@xxxxxxxxxx]
>Sent: Wednesday, December 11, 2002 1:59 PM
>To: thin@xxxxxxxxxxxxx
>Subject: [THIN] mini-poll: mirrored disk or page file on a seperate
>disk?
>
>
>I'm semi-involved in a project where we are looking at deploying a =3D3D
>fairly large farm (approx 30 servers) using blade servers. Each blade =
>=3D
>=3D3D
>only has place for 2 drives, and we're not going to SAN attach them.
>In this situation would you:
>a) mirror two drives and place everything on this mirror set?
>b) not mirror them and place the page file on it's own drive?
>=3D3D20
>Option a is obviously for a bit more redundancy, option b is for =3D3D
>performance. Dual CPU blades with 2 or 4 GB RAM.
>=3D3D20
>/charles
>
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