[THIN] Re: mini-poll: mirrored disk or page file on a seperate disk?
- From: "Alexander Danilychev" <teknica@xxxxxxxxxxx>
- To: thin@xxxxxxxxxxxxx
- Date: Thu, 12 Dec 2002 15:33:57 -0800
Hi,
"RAID 10 is implemented as a striped array whose segments are RAID 1
arrays", so it is neither a mirrored RAID 5 array nor a Mirrored Mirror.
ALEX
>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 15:20:15 -0800
>
>
>Reread that article you posted.. Raid 10 is a stripe-set mirrored.
>
>Joe
>
>-----Original Message-----
>From: Chris Lynch [mailto:lynch00@xxxxxxx]
>Sent: Thursday, December 12, 2002 2:15 PM
>To: thin@xxxxxxxxxxxxx
>Subject: [THIN] Re: mini-poll: mirrored disk or page file on a seperate
>disk?
>
>
>
>Edward,
>
>RAID 10 isn't a mirrored RAID 5 array. It is a Mirrored Mirror. You
>can read more about the different RAID types here:
>http://www.acnc.com/04_01_10.html
>
>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.=20
>
>Honestly I believe RAID 10 needs 4 disks, where a stripped ( Non Parity)
>Mirror would only need 2.=20
>
>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=20
>drives and they default to 0+1. However, my traditional understanding
>of=20
>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 =
>=3D=20
> >strip sets mirrored. A strip set would require 2 drives, and to mirror
>
> >=3D them 2 more. Thus 4 drives... Setting Raid 0+1 on 2 drives is =
>just=20
> >=3D 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.=20
> >=3D It defaults to RAID0+1 which is a stripped Mirror. Note I didn't =
>say=20
> >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
>
> >=3D3D for that, the blades only allow for two.
> >
> >In any case, server class raid controllers generally support RAID 10=20
> >=3D3D 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=20
> >it 1.5X Physical memory.=3D3D20
> >
> >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 =3D3D3D
> >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=20
> >disk?
> >
> >
> >I'm semi-involved in a project where we are looking at deploying a=20
> >=3D3D3D fairly large farm (approx 30 servers) using blade servers. Each =
>
> >blade =3D =3D3D =3D3D3D
> >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?
> >=3D3D3D20
> >Option a is obviously for a bit more redundancy, option b is for =
>=3D3D3D
> >performance. Dual CPU blades with 2 or 4 GB RAM.
> >=3D3D3D20
> >/charles
> >
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