solaris with ZFS and informix DB memory issue.
Hi,
We are using Solaris 10 5/09 s10s_u7wos_08 SPARC Patch level Generic_142900-02 (Dec 09 PatchCluster release) Informix DB version 11.5FC6 OS File systems ZFS System is connected with SAN wich is also configured with ZFS in OS. Now Problem is Memory Total memory in system Memory size: 32640 Megabytes vmstat displays that only 4 GB is left Code:
vmstat 1 3 While informix is using just 5 to 6 GB and no other process on the system is using significant memory. On thoroughly investigating I found Code:
mdb -k ZFS File Data is using most of the memory. Kindly help me what is that ? Is it normal behaviour ? |
Yes. Unused memory is wasted memory anyway.
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Hi jlliagre,
Thanks for your reply. Is the ZFS File Data memory is like the system cache memory.Which become available when required. This is our main DB machine and memory is heavily demanded by databases on that. |
That's it. Most of this memory is used by the ZFS ARC cache and this memory is made available to processes if demand occurs.
Note that you can limit the ARC cache size which make sense in some situations: http://www.solarisinternals.com/wiki..._the_ARC_Cache |
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