Bjorn Munch writes:
> Hello,
>
> I am doing some tests using ZFS for the data files of a database
> system, and ran into memory problems which has been discussed in a
> thread here a few weeks ago.
>
> When creating a new database, the data files are first initialized to
> their configured size (written in full), then the servers are started.
> They will then need to allocate shared memory for database cache. I
> am running two database nodes per host, trying to use 512Mb memory
> each.
>
> They are using so-called "Intimate Shared Memory" which requires that
> the requested amount is available in physical memory. Since ZFS has
> just gobbled up memory for cache, it is not available and the database
> won't start.
>
> This was on a host with 2Gb memory.
>
That seems like a bug. ZFS is designed to release memory
upon demand by the DB. Which OS was this running ?
Could be related to :
MrNumber: 4034947
Synopsis: anon_swap_adjust(), anon_resvmem() should
call kmem_reap() if availrmem is low.
Fixed in snv_42
-r
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