Message-Id: <10665.120585@fatcity.com> From: Satar Naghshineh Date: Mon, 30 Oct 2000 10:30:42 -0800 Subject: RE: RAID This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. ------_=_NextPart_001_01C0429F.82907180 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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@galottery.org] > 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" = 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 > ROR =AA=BF=AA >=20 >=20 >=20 >=20 ------_=_NextPart_001_01C0429F.82907180 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable RE: RAID

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,
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