Anonymous_User Absent Member.
Absent Member.
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Mirror NSS and Multipath

Hi,
we have implement a 2 node nw 6.5 cluster by one of our customer.
Both nodes have 2 Qlogic 2300 HBAs an are connected over 2 Qlogic SANbox
Fibre Channel Switches to an ACER S700 FC Storage.
Clustering works fine.
Just now, we have implement a second SAN Storage (same as above) for
redundancy, the storage are connected to both Fibre Channel Switches. We are
enable NSS Mirror on the Primary Storage - it works - no Problems BUT:

- when the customer get or put large files (ZEN Images) to or from the
Storage, both nodes get a poisen pill.
- when the customer make a backup (arcserve 11.1) on of the nodes get a
poisen pill

When we disable the NSS Mirror, all function works fine!

any ideas?

Martin
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Anonymous_User Absent Member.
Absent Member.

Re: Mirror NSS and Multipath

Martin Ehlers wrote:

> - when the customer get or put large files (ZEN Images) to or from the
> Storage, both nodes get a poisen pill.


at a guess, I would say you are either overloading your fiber or
overloading your LAN connections. What is the exact message that
appears on the server console when it poison pills?

--
Joe Moore
Novell Support Forums SysOp
http://just.fdisk-it.com
http://www.caledonia.net/jmdns.html
http://www.caledonia.net/nesadmin.html
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Anonymous_User Absent Member.
Absent Member.

Re: Mirror NSS and Multipath


NSS mirroring really loads the LAN drivers and the heartbeat is then
swamped by the other traffic. The problem with NSS mirroring is that
disk traffic is considered the highest priority and everything else,
including the heartbeat, is lower down the list...

Bump the heartbeat to 16 seconds as a start. Getting rid of NSS
mirroring would solve this, meethinks.




--
Cheers!
Richard Beels
~ Network Consultant
~ Sysop, Novell Support Connection
~ MCNE, CNE*, CNA*, CNS*, N*LS


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Anonymous_User Absent Member.
Absent Member.

Re: Mirror NSS and Multipath

Richard Beels [SysOp] <beels@technologist.com> wrote:

>
> NSS mirroring really loads the LAN drivers


Even with Fibre Channel storage, like the OP has?

/dps

--
Using Opera's revolutionary e-mail client: http://www.opera.com/m2/
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Anonymous_User Absent Member.
Absent Member.

Re: Mirror NSS and Multipath



What do you mean 'NSS mirroring really loads the LAN drivers' ?- we're running a system much like this for about a year with no probs - would suggest this guy looks at his disc subsystem and it's relative load under backup/ large file copy - maybe there is a problem with the cluster services partition getting updated?



>>> Richard Beels [SysOp]<beels@technologist.com> 28/10/2005 21:30:17 >>>



NSS mirroring really loads the LAN drivers and the heartbeat is then
swamped by the other traffic. The problem with NSS mirroring is that
disk traffic is considered the highest priority and everything else,
including the heartbeat, is lower down the list...

Bump the heartbeat to 16 seconds as a start. Getting rid of NSS
mirroring would solve this, meethinks.




--
Cheers!
Richard Beels
~ Network Consultant
~ Sysop, Novell Support Connection
~ MCNE, CNE*, CNA*, CNS*, N*LS

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