In this description "spindle" is a concept where any number of drives are =
treated as one drive or device. Lose the connection to the device and you =
lose the access to all of the data stored on the RAID5 drive not just the =
data stored on 1 of the physical drives composing the RAID5 configuration.
ROR =AA=BF=AA
>>> Satar.Naghshineh_at_irvine.mellesgriot.com 10/30/00 01:40PM >>>
That I understand. You were using "spindle" to mean "Logical device". When =
I
see the word "spindle", I think of the physical spindle of a hard drive. =
So,
in a RAID5 configuration, you are using multiple spindles (Which was my
initial statement).
Regards,
Satar
> -----Original Message-----
> From: Ron Rogers [SMTP:RROGERS_at_galottery.org]=20
> Sent: Monday, October 30, 2000 2:55 PM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: RAID
>=20
> Satar,
> Maybe I'm not explaining it clear enough or in terms we both understand=
.
> I don't think that it has to do with the lunar phases of the moon and =
the
> tides of the world.
> If you use the RAID 5 configuration of drives, the drives are treated =
as
> one drive. As an example: if you have 5 -10 GIG drives used seperately =
as
> individual drives you can place the 5 drives where ever you want and on
> what controller you want. You have the full benefit of the 5 independent
> drives. If you use the drives as a RAID5 configuration you in effect =
have
> only 1 drive to use. The RAID5 configured drive. The total capacity of =
the
> "drive" will be 40 GIG, not 50 GIG, because of the parity algorythem =
that
> uses one of the drives. If you lose one of the physical drives in the
> RAID5 configuration the values on that drive can be durived from the
> values on the other 4 drives.
> As example: if the 5 drives have the values 1, 2, 3, 4, 10 stored on =
them
> in the same stripe then you can calculate the missing value on the drive
> stripe that was defective. 1+2+3+4=3D10. 10 being the "parity" informatio=
n.
> Losing the first drive and calculating the value of the data stored is
> 10-(2+3+4) =3D1.
> The RAID5 configuration is treated as one logical device (spindle) not =
5
> logical devices.
Received on Mon Oct 30 2000 - 13:22:14 CST
