Also forgot to mention, RAID 50 is a mirrored RAID 5 array. Even though the site I just gave doesn't have it listed, it does exist. You can do a simple Google search for RAID 50. Chris -----Original Message----- From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Ziots, Edward Sent: Thursday, December 12, 2002 12:44 PM To: 'thin@xxxxxxxxxxxxx' Subject: [THIN] Re: mini-poll: mirrored disk or page file on a seperate disk? Actually I just built a server, and it shows RAID 1+0 not 0+1, but most people think of RAID 0+1 as RAID 10. Which is a RAID 5 Array Mirrored, so basically it would be 4 drives. ( Actually I believe 3 would be fine) Disk1 Disk2 Disk3 Data Data Parity Data Parity Data Parity Data Data Then Disk 1,2,3 would be mirrored to each other. Honestly I believe RAID 10 needs 4 disks, where a stripped ( Non Parity) Mirror would only need 2. EZ -----Original Message----- From: P.J. Johannsen [mailto:pjohannsen@xxxxxxxxxxx] Sent: Thursday, December 12, 2002 3:27 PM To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: mini-poll: mirrored disk or page file on a seperate disk? 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 > >***********************************************=3D3D20 >This Weeks Sponsor: triCerat Inc. >triCerat introduces RegSet. 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