I've also found this http://developers.sun.com/solaris/docs/wp-oraclezfsconfig-0510_ds_ac2.pdf
On 9 December 2010 20:22, Jabbar <aja...@gmail.com> wrote: > Hello Tony, > > If the hardware hasn't changed I'd look at the workload on the database > server. If the customer is taking regular statspack snapshots they might be > able to see whats causing the extra activity. They can use AWR or the > diagnostic pack, if they are licensed, to see the offending SQL or PL/SQL or > any hot objects. > > However if you want to tune at the ZFS level then the following has some > advice for ZFS and databases > http://www.solarisinternals.com/wiki/index.php/ZFS_for_Databases. > > On 9 December 2010 15:48, Tony Marshall <tony.marsh...@oracle.com> wrote: > >> Hi All, >> >> Is there a way to tune the zfs prefetch on a per pool basis? I have a >> customer that is seeing slow performance on a pool the contains multiple >> tablespaces from an Oracle database, looking at the LUNs associated to that >> pool they are constantly at 80% - 100% busy. Looking at the output from >> arcstat for the miss % on data, prefetch and metadata we are getting around >> 5 - 10 % on data, 50 - 70 % on prefetch and 0% on metadata. I am thinking >> that the majority of the prefetch misses are due to the tablespace data >> files. >> >> The configuration of the system is as follows >> >> Sun Fire X4600 M2 8 x 2.3 GHz Quad Core Processor, 256GB Memory >> Solaris 10 Update 7 >> ZFS Arc cache max set to 85GB >> 4 Zpools configured from a 6540 Storage array >> >> - apps - single LUN (raid 5) recordsize set to 128k, from the array, >> pool contains binaries and application files >> - backup - 8 LUNs (varying sizes all from a 6180 array with SATA >> disks) used for storing oracle dumps >> - data - 5 LUNs (Raid 10 6 physical drives) recordsize set to 8k, >> used for Oracle data files >> - logs - single LUN (raid 10 from 6 physical drives) recordsize set to >> 128k, used for Oracle redo log files, temp db, undo db and control files. >> >> 18 Solaris 10 zones, of which 12 of these are oracle zones sharing the >> data and logs pools. >> >> I think that the prefetch will be useful on the apps and backup pools, >> however I think that on the data and logs pools this could be causing issues >> with the amount of IO that is being caused by the prefetch and the amount >> that it is missing in the arcstats could be the reason why the devices are >> at 100% busy. Is there a way to turn the prefetch off for just a single >> pool? Also is this something that can be done online or will it require a >> reboot to put into effect. >> >> Thanks in advance for your assistance in this matter. >> >> Regards >> Tony >> -- >> [image: Oracle] <http://www.oracle.com> >> Tony Marshall | Technical Architect >> Phone: +44 118 924 9516 <tel:+44%20118%20924%209516> | | | Mobile: +44 >> 7765 898570 <tel:+44%207765%20898570> >> Oracle Remote Operations Management >> United Kingdom >> >> ORACLE Corporation UK Ltd is a company incorporated in England & Wales | >> Company Reg. No. 1782505 | Reg. office: Oracle Parkway, Thames Valley Park, >> Reading RG6 1RA >> [image: Green Oracle] <http://www.oracle.com/commitment> Oracle is >> committed to developing practices and products that help protect the >> environment >> >> _______________________________________________ >> zfs-discuss mailing list >> zfs-discuss@opensolaris.org >> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >> >> > > > -- > Thanks > > A Jabbar Azam > > -- Thanks A Jabbar Azam
<<green-for-email-sig_0.gif>>
<<oracle_sig_logo.gif>>
_______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
