Message-Id: <10662.120487@fatcity.com> From: Satar Naghshineh Date: Fri, 27 Oct 2000 10:50:07 -0700 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_01C0403E.57DC5A60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Cache, regardless of RAID level, is always dangerous. That's why when = you look for storage solutions, make sure that the cache is mirrored and = that there is a backup power device that allows the cache to sync in the = drives before powering off. To take it to the next level, make sure the data = path to the drives are redundant as well. Ron, I don't understand the logic behind your spindle theory.=20 by the way, RAID also works well for killing insects! Regards, Satar > -----Original Message----- > From: Ron Rogers [SMTP:RROGERS@galottery.org] > Sent: Friday, October 27, 2000 4:01 PM > To: Multiple recipients of list ORACLE-L > Subject: Re: RAID >=20 > The recommendation when using RAID5 is to have disk cache turned off. = If > for some unforseen reason the system was to crash when your changes = were > in the cache, they would be written as far as Oracle was concerned = but > they would be lost in the cache in real life and may not be written = at > all. > With RAID5 you do not get the versatility of many spindles to place = the > data on. It is transformed into one spindle and there will be disk > contention to deal with or live with. If your application can stand > waiting while the tables are updated then RAID5 will work. RAID5 = performes > best in a query based application. > ROR =AA=BF=AA >=20 >=20 ------_=_NextPart_001_01C0403E.57DC5A60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable RE: RAID

Cache, regardless of = RAID level, is always dangerous. That's why when you look for storage = solutions, make sure that the cache is mirrored and that there is a = backup power device that allows the cache to sync in the drives before = powering off. To take it to the next level, make sure the data path to = the drives are redundant as well.

Ron, I don't = understand the logic behind your spindle theory.

by the way, RAID = also works well for killing insects!

Regards,
Satar