RE: RAID

From: Satar Naghshineh <Satar.Naghshineh_at_irvine.mellesgriot.com>
Date: Fri, 27 Oct 2000 10:50:07 -0700
Message-Id: <10662.120487@fatcity.com>

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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_at_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

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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

<UL>
-----Original Message-----
 From:   Ron Rogers [SMTP:RROGERS_at_galottery.org]
 Sent:   Friday, October 27, 2000 4:01 PM
 To:     Multiple recipients of list ORACLE-L
 Subject:       =
 Re: RAID


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
Received on Fri Oct 27 2000 - 12:50:07 CDT