[THIN] Re: mini-poll: mirrored disk or page file on a seperate disk?

No, that's RAID 50... Raid 10 is a strip set of mirrored drives.   0+1 =
is a mirrored strip-set..  Raid 50 is a Raid 5 strip-set (w/ parity) of =
mirrored drives.

JOe

-----Original Message-----
From: Ziots, Edward [mailto:EZiots@xxxxxxxxxxxx]
Sent: Thursday, December 12, 2002 1:44 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)=20

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
>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 =
=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. =
=3D
>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
>=3D3D
>for that,  the blades only allow for two.
>
>In any case, server class raid controllers generally support RAID 10 =
=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 =
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
>disk?
>
>
>I'm semi-involved in a project where we are looking at deploying a =
=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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