Binaries on the local disk aren't faster then binaries on
Symmetrix, as long as Symmetrix isn't configured as RAID-5,
please pardon my French. If Symmetrix is configured as RAID-1+0,
then it equals or exceeds internal disks in speed and clearly
surpasses them in reliability. Problem is that you are not supposed
to waste those internal disks either, so you should put there something
that can be easily re-created. Oracle executables are (hopefully) not
changing on the daily basis. If they are, then you have problem with
gremlins who mastered software engineering, which is an especially nasty
variety. Internal disks are usually connected to the rest of the system
by 320 UW SCSI III with 320 MBit sec transfer rate while Symmetrix is
usually connected by something called FC/AL (Fiber Channel/Arbitrated Loop).
Fiber Channel in its latest incarnation surpasses 1GBit/sec, which means
that FC controller is significantly faster then SCSI. Disks are usually
produced by 3rd party vendor in both cases, so it doesn't really matter.
You get 10milisec average access time, which usually turns into 30 milisec
per I/O request, which is excruciatingly slow. Now enters the best EMC
cash cow: cache memory. It helps significantly reduce average disk access
time, but it is not free. As a matter of fact, it is very expensive.
Now is the time to stop the story, because we came to the point where I
should discuss things like buffer cache efficiency and implementation,
priority paging (implemented only by Solaris, of all unixes) and things
from the Adrian Cockroft's "Ferrari" book, which definitely outside the
scope of this list.
--
Mladen Gogala
A & E TV Network
Ext. 1216
> -----Original Message-----
> From: Duret, Kathy [mailto:kduret_at_starkinvestments.com]
> Sent: Thursday, August 26, 2004 5:10 PM
> To: Oracle L (E-mail)
> Subject: BINARIES - San or Local Storage
>
>
> We are in the process of moving to 10G and getting a new SAN
> EMC Clarion Storage Array. We also MAY be going to RAC.
> These are Solaris Boxes
>
> The question is I have read conflicing things about whether
> to put the binaries on the local internal disks or the SAN arrays.
>
> I have always put the binaries on the local internal disk.
> What do you do
> and why?
>
> Is the local reads for the binaries that much quicker?
>
>
> Thanks,
>
> Kathy
> Oracle Database Monkey
>
>
>
>
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