zorg at probesys.com
Fri Apr 15 04:48:15 EDT 2005
ould you give me just some more explaination of what is the stage./
files used during LMTP delivery have unique filenames
so if i underdstand what you saying. if the stage./ files used during
LMTP delivery is the same for all the node of the cluster share the same
SAN then there won't be any problem
Ben Carter a écrit :
> Dave McMurtrie wrote:
>> Amos wrote:
>>> What sort of changes did you have to make?
>> We just had to change map_refresh() to call mmap() with MAP_PRIVATE
>> instead of MAP_SHARED. Since mmap() is being called with PROT_READ
>> anyway, this doesn't affect the operation of the application since
>> the mapped region can never be updated. Veritas CFS was not very
>> efficient about maintaining cache coherency across all cluster nodes
>> when we were using MAP_SHARED. Everything worked, but under heavy
>> load it became extremely slow.
> Actually, the important code change for any active/active cluster
> configuration is to make sure the stage./ files used during LMTP
> delivery have unique filenames across the cluster.
> There are some other setup differences related to this same issue such
> as symlinking /var/imap/proc, /var/imap/socket, and if you care
> /var/imap/log to local filesystem space on each cluster node. You
> could make these filenames unique across the cluster with code changes
> if you want to make the code changes for these also.
> We added a "clusternode" parameter to imapd.conf to accomplish this
> for the LMTP stage./ files.
> Otherwise, it just worked.
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