Gregory Shaw wrote On 05/11/06 21:15,:
Regarding directio and quickio, is there a way with ZFS to skip the
system buffer cache? I've seen big benefits for using directio when
the data files have been segregated from the log files.
Having the system compete with the DB for read-ahead results in double
work.
Getting rid of the extra copy of data in a filesystem buffer also
reduces the memory footprint. As the data are being cached in the
DBMS buffer the extra copy in the filesystem cache is useless (except
occasionly as a work around for deficiencies in the DBMS' cacheing
mechanisms). This is also important if there is non-DBMS related
filesystem activity which can benefit from having data in the
filesystem buffer as these compete with the (useless) DBMS data.
Is there a good short description about how the ZFS buffer cache
works?
Thanks,
Franz
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