[windows2000] Re: Raid
- From: "Joe Shonk" <JShonk@xxxxxxxxxxxxxx>
- To: <windows2000@xxxxxxxxxxxxx>
- Date: Thu, 23 Jan 2003 09:37:10 -0800
Re-read that article...=20
"One Write or two Reads possible per mirrored pair
Twice the Read transaction rate of single disks, same Write transaction =
rate as single disks"
Joe
-----Original Message-----
From: Robert Funderburk [mailto:robfunderburk@xxxxxxxxxxx]
Sent: Thursday, January 23, 2003 9:42 AM
To: windows2000@xxxxxxxxxxxxx
Subject: [windows2000] Re: Raid
I think you're thinking of RAID 0. RAID 0 is a stripe set, and RAID 1 =
is a
mirror set. In the mirror set, you are writing to both disks but only =
ever
reading from 1. The second drive is used in case the first one fails. =
In
RAID 0, you are striping, or writing different stripes of data across 2 =
or
more disks. That's where you get the performance.
Anyone who's interested, check out http://www.acnc.com/04_01_00.html for =
a
pretty good explanation of the different types of RAID.
=20
-----Original Message-----
From: windows2000-bounce@xxxxxxxxxxxxx
[mailto:windows2000-bounce@xxxxxxxxxxxxx] On Behalf Of Joe Shonk
Sent: Thursday, January 23, 2003 11:24 AM
To: windows2000@xxxxxxxxxxxxx
Subject: [windows2000] Re: Raid
Not necessarily... With RAID 1, you have two drive to read from. Not =
=3D one.
A 3 Drive RAID five, your effectively reading off of 2 spindles =3D for =
data
and one for parity (yes the parity is distributed, but the =3D point is =
2 of
the 3 disk reads are data.) With RAID 5, you need atleast =3D 4-5 =
spindles to
gain a perfomance increase over RAID 1. By that time, =3D
you could do RAID 1+0 instead. A DC isn't going to require alot of =
=3D
disk space. RAID 1 is also cheaper that RAID 5 and has the same fault =
=3D
tolerance as RAID 5.
Joe
-----Original Message-----
From: Robert Funderburk [mailto:robfunderburk@xxxxxxxxxxx]
Sent: Thursday, January 23, 2003 8:46 AM
To: windows2000@xxxxxxxxxxxxx
Subject: [windows2000] Re: Raid
I disagree. In a RAID 1 setup your max throughput is the speed of a =3D
single drive. In RAID 5, it will almost always be higher is you have =
even 3
drives, because of the striping across all three. When you account for =
=3D
the overhead of writing the parity info, you still get slightly higher
throughput than a RAID 1 setup. This performance increases with the =3D
number of drives you add to the stripe.
-----Original Message-----
From: windows2000-bounce@xxxxxxxxxxxxx
[mailto:windows2000-bounce@xxxxxxxxxxxxx] On Behalf Of Joe Shonk
Sent: Thursday, January 23, 2003 10:20 AM
To: windows2000@xxxxxxxxxxxxx
Subject: [windows2000] Re: Raid
RAID 1, for fault-tolerance and speed. Raid 1 will be faster than raid =
=3D
=3D3D 5.
The AD database will not grow large enough that you will need multiple =
=3D =3D3D
disks and form a raid 5 subset... But if you do, and you get yourself a =
=3D
=3D3D decent controller you could always convert from Raid 1 to 5 on the =
fly.
Joe
-----Original Message-----
From: bbeckett2000@xxxxxxxxx [mailto:bbeckett2000@xxxxxxxxx]
Sent: Thursday, January 23, 2003 7:02 AM
To: windows2000@xxxxxxxxxxxxx
Subject: [windows2000] Raid
Building a 2000 DC in a pristine domain. What would most of you =3D3D =
=3D
recommend on=3D3D20 the DC for fault tolerance, RAID 1 or RAID 5 and =
why?
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