how about paging to SAN?

Thank you

It seems that there are some mistakes in the multipath software... HDS
engineer told me not to use HDLM when SAN was used for paging...

On 3ÔÂ22ÈÕ, ÉÏÎç8ʱ25·Ö, "Denise" wrote:
On Mar 20, 12:21 pm, "Hardy" wrote:





On Mar 20, 11:20 pm, wrote: On Mar 20, 9:11 am, " wrote:

Hi, I'm considering to deploy my paging space in a SAN product, say,
HDS AMS1000. I know it's a safer decision to use rootvg but I think it
worths a discussion.

It's a olap application so the paging is major of big data blocks.

Pls share your opinions and pls share the experience using a paging on
SAN if you have...

in a situation where not well tuned ad-hoc queries on Tbs data, or
something similar you cannot control...
I know either is a disaster when we trap into a large paging situation
but I just want the one but the worst.

Thank you.

Personally, I don't like paging, or booting from SAN, as it adds
additional
layers of complexity, and additional equipment that MUST be working
error
free, in order to have an operational system.
(HBA's, link cables, switches, fabrics, trunking, array firmware....
etc)

In this particular case, I would worry more about WHY I'm paging, than
where to place the paging space on disk. If you're paging, application
performance is going to suffer in either case.- Hide quoted text -

- Show quoted text -

Hi,
I am using SAN for paging on one of my larger AIX DB servers. I do
have hd6 of course, but all my additional paging space is on SAN. I
am running 10 Oracle apps databases off this particular server. I
have been doing this for almost a year with no issues. The SAN is
EMC symetrics, not power path. I will agree with a previous poster
EMC power path software has caused me issues in the past, using EMC
Clarion on AIX.

- Òþ²Ø±»ÒýÓÃÎÄ×Ö -

- ÏÔʾÒýÓõÄÎÄ×Ö -

Denise wrote:
[snip]
Hi,
I am using SAN for paging on one of my larger AIX DB servers. I do
have hd6 of course, but all my additional paging space is on SAN. I
am running 10 Oracle apps databases off this particular server. I
have been doing this for almost a year with no issues. The SAN is
EMC symetrics, not power path. I will agree with a previous poster
EMC power path software has caused me issues in the past, using EMC
Clarion on AIX.

As a soon-to-be AIX user (+EMC Symmetrix), I'd be interested in knowing what
kind of PowerPath issues you experienced.

--
David J Dachtera
dba DJE Systems
http://www.djesys.com/

Unofficial OpenVMS Marketing Home Page
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Christopher Petersen wrote:

On Tue, 20 Mar 2007 06:11:31 -0700, wrote:

Hi, I'm considering to deploy my paging space in a SAN product, say,
HDS AMS1000. I know it's a safer decision to use rootvg but I think it
worths a discussion.

It's a olap application so the paging is major of big data blocks.

Pls share your opinions and pls share the experience using a paging on
SAN if you have...

Thank you.

I hate to be the voice of doom and gloom, but I have seen infrequent
scenarios where a hiccup of some sort in the SAN while AIX was servicing a
page fault to/from a SAN-based paging space started the O/S on a slow
spiral to oblivion or crashed it. I've seen that with McData and Cisco
switches in the middle but always with EMC disk in the back end, so it may
have more to do with the EMC PowerPath software driver stack than it does
anything else...

As a soon-to-be AIX user (+EMC Symmetrix), I'd be interested in any details you
can provide.

Feel free to contact me off-line. How to demung the reply-to should be obvious.

--
David J Dachtera
dba DJE Systems
http://www.djesys.com/

Unofficial OpenVMS Marketing Home Page
http://www.djesys.com/vms/market/

Unofficial Affordable OpenVMS Home Page:
http://www.djesys.com/vms/soho/

Unofficial OpenVMS-IA32 Home Page:
http://www.djesys.com/vms/ia32/

Unofficial OpenVMS Hobbyist Support Page:
http://www.djesys.com/vms/support/