Re: [zfs-discuss] Re: Re: ZFS memory and swap usage
Hello Rainer, Monday, March 19, 2007, 3:07:54 AM, you wrote: RH Thanks for the feedback. Please see below. ZFS should give back memory used for cache to system if applications are demanding it. Right it should but sometimes it won't. However with databases there's simple workaround - as you know how much ram all databases will consume at least you can limit ZFS's arc cache to remaining free memory (and possibly reduce it even more byt 2-3x factor). For details on how to do it see 'C'mon ARC, stay small...' thread here. So if you have 16GB RAM in a system and want 10GB for SGA + another 2GB for Oracle + 1GB for other kernel resources you are with 3GB left. So I would limit arc c_max to 3GB or even to 1GB. RH I was of the understanding that this kernel setting was only RH introduced in newer Nevada builds. Does this actually work under Solaris 10, Update 3? Yes -- Best regards, Robertmailto:[EMAIL PROTECTED] http://milek.blogspot.com ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Re: Re: ZFS memory and swap usage
Info on tuning the ARC was just recently updated: http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide#Memory_and_Dynamic_Reconfiguration_Recommendations -r Rainer Heilke writes: Thanks for the feedback. Please see below. ZFS should give back memory used for cache to system if applications are demanding it. Right it should but sometimes it won't. However with databases there's simple workaround - as you know how much ram all databases will consume at least you can limit ZFS's arc cache to remaining free memory (and possibly reduce it even more byt 2-3x factor). For details on how to do it see 'C'mon ARC, stay small...' thread here. So if you have 16GB RAM in a system and want 10GB for SGA + another 2GB for Oracle + 1GB for other kernel resources you are with 3GB left. So I would limit arc c_max to 3GB or even to 1GB. I was of the understanding that this kernel setting was only introduced in newer Nevada builds. Does this actually work under Solaris 10, Update 3? Thanks again. Rainer This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
[zfs-discuss] Re: Re: ZFS memory and swap usage
Thanks for the feedback. Please see below. ZFS should give back memory used for cache to system if applications are demanding it. Right it should but sometimes it won't. However with databases there's simple workaround - as you know how much ram all databases will consume at least you can limit ZFS's arc cache to remaining free memory (and possibly reduce it even more byt 2-3x factor). For details on how to do it see 'C'mon ARC, stay small...' thread here. So if you have 16GB RAM in a system and want 10GB for SGA + another 2GB for Oracle + 1GB for other kernel resources you are with 3GB left. So I would limit arc c_max to 3GB or even to 1GB. I was of the understanding that this kernel setting was only introduced in newer Nevada builds. Does this actually work under Solaris 10, Update 3? Thanks again. Rainer This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
