Mark,
Cheers, -- Mark Brinsmead.
Teehan, Mark wrote:
Redhat 3 ES, 2.4.21-32.0.1.ELsmp, Oracle 10.2.0.1 RAC, OCFS 1.0.12
I run database backups to an ext3 filesystem, using both rman and regular hotbackups on different servers. Linux uses all available ram to cache the writes to ext3, which can reduce free memory to 10-20MB (the box has 12GB) - this is how it is supposed to work. Sometimes the kernel is unable to allocate ram for new processes when it drop to this level and causes errors. It seems to me that filesystem block caching is unsuitable for a database server - it is not an issue for OCFS, only for backups to ext3.
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