[THIN] Re: mini-poll: mirrored disk or page file on a seperate disk?
- From: "Joe Shonk" <JShonk@xxxxxxxxxxxxxx>
- To: <thin@xxxxxxxxxxxxx>
- 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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