As long as your mount points are not sharing disks from
the same volume group you are correct. However, its
expensive to write to RAID 5 which is why you will usually
see raid 0+1 instead.
-Original Message-
Sent: Sunday, September 09, 2001 7:55 AM
To: Multiple recipients of list ORACLE
-- Don Granaman <[EMAIL PROTECTED]>
> It isn't mount points that matter for I/O contention, it is spindles and
> channels - the physical disk layout. If this is one set of disks used in
> one large RAID-5 setup, then creating multiple mount points for logical
> volumes created on top of it wil
Steven, i'm with you on the "nothing works concept", since i'm a
consultant, i end end up throwing my hands in the air(after tuning all
that i can from the db side, sql, etc) and leaving it up to the "disk
nazis". They do as they please with no input and and can sometimes be
the killer of perfor
-- Joe Testa <[EMAIL PROTECTED]>
> It all depends on the underlying striping of the physical disks. I'm
> unfortunately constrained by raid 5 also, so my hands are tied when it
> comes to disk contention fixes, so i leave it to the unix SA to deal
> with it, i just end up with one huge logical
It isn't mount points that matter for I/O contention, it is spindles and
channels - the physical disk layout. If this is one set of disks used in one
large RAID-5 setup, then creating multiple mount points for logical volumes
created on top of it will do nothing to reduce I/O contention. To bala
-- "CHAN Chor Ling Catherine (CSC)" <[EMAIL PROTECTED]>
> Correct me if I am wrong. I thought though I use Raid 5 but with different
> mount points, I will not have contention problems
> For example
> One mount point for data files
> Another mount point for index files.
Makes sense. Also hel
have contention problems
> For example
> One mount point for data files
> Another mount point for index files.
>
> Please advise. Thanks.
>
> Regds,
> New Bee
> -Original Message-
> From: Joe Testa
> To: Multiple recipients of list ORACLE-L
> Sent: 09/09/
Hi Joe,
What's your configuration ? Raid 1 ?
How do U organize the oracle directories ?
Correct me if I am wrong. I thought though I use Raid 5 but with different
mount points, I will not have contention problems
For example
One mount point for data files
Another mount point for index files.
CHAN:
If I'm wrong, please correct me, but if you're talking about where to put
things for performance reasons and you're using a RAID 5 configuration, then
it doesn't make any difference. With a RAID 5 configuration, as I remember,
is striped with parity and all the disks are seen as one big vol
if u dont know the underlying striping and someone else built the
filesystes, then the point is moot, you might as well have one logical
disk, since you cant reallt guarantee where something is going to end up
anyways.
with all of the raid5 stuff(that evryone likes so much anymore), we as
DBAs do
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