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" information.=
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.
HTH
Received on Mon Oct 30 2000 - 08:47:12 CST
