[windows2000] Re: Raid

  • From: Robert Funderburk <robfunderburk@xxxxxxxxxxx>
  • To: windows2000@xxxxxxxxxxxxx
  • Date: Thu, 23 Jan 2003 13:44:55 -0500

"Transfer rate per block is equal to that of a single disk"



-----Original Message-----
From: windows2000-bounce@xxxxxxxxxxxxx
[mailto:windows2000-bounce@xxxxxxxxxxxxx] On Behalf Of Joe Shonk
Sent: Thursday, January 23, 2003 12:37 PM
To: windows2000@xxxxxxxxxxxxx
Subject: [windows2000] Re: Raid



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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