RE: Large ASM installation
- From: "Randy Johnson" <oraclelist@xxxxxxxxxxxxx>
- To: <harel.safra@xxxxxxxxx>, <stalinsk@xxxxxxxxx>
- Date: Tue, 26 Oct 2010 11:24:21 -0500
External redundancy is most appropriate when using enterprise class SAN's
like EMC. Use normal redundancy for less resiliant or trustworthy storage. I
don't see high redundancy used much but I expect it would be useful for
slower/cheaper JBOD storage or low end, 3rd tier storage. If its done right,
each higher level of redundancy means more IOPS (more spindles), and higher
data transfer rate (assuming you configure a fat enough pipe to the disks).
-Randy
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of Harel Safra
Sent: Saturday, October 23, 2010 2:55 PM
To: stalinsk@xxxxxxxxx
Cc: oraclelist@xxxxxxxxxxxxx; daniel.fink@xxxxxxxxxxxxxx; oracle-l
Subject: Re: Large ASM installation
We've configured external redundancy as we're running on EMC storage that
already supplies fault tolerance.
We see no need to run ASM mirrors on top of EMC RAID.
Harel Safra
On 23/10/2010 21:39, Stalin wrote:
> Wondering how many of you use External Vs Normal redundancy in ASM
> installations. If normal is chosen over external or vice versa, any
> compelling reason for choosing one over the other would be
> appreciated.
>
> Sorry Daniel. Didn't mean take the thread away from you.
>
> PS. Sorry to Re-post as it didn't get through the first time.
>
> On Fri, Oct 22, 2010 at 12:02 PM, Randy Johnson
> <oraclelist@xxxxxxxxxxxxx> wrote:
>> Hi Daniel,
>> I've been using ASM for the past 5 years (since 10.2). I've had very
>> good experience with it on all sizes of databases ranging from multi
>> gigabytes to multi terabytes and I'm a big fan. I've read the posts
>> by Rui and Mark and they did a good job of calling out the pros/cons
>> of ASM over file system storage. Here's my $.02:
>>
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