Ben, This looks good !
I Couple of points ; - You might want show whether ARC is throttled. (Although this is not available as a kstat). I think it is good indication of how stressed is the box. - I am not sure if 'anon_hits' make too much sense. : -- From arc.c -- * Anonymous buffers are buffers that are not associated with * a DVA. These are buffers that hold dirty block copies * before they are written to stable storage. By definition, * they are "ref'd" and are considered part of arc_mru * that cannot be freed. Generally, they will aquire a DVA * as they are written and migrate onto the arc_mru list. */ -- snip -- I agree with you that we would need a little better explaination about the demand* parameters. Let me try and understand that a little better. Thanks and regards, Sanjeev. Ben Rockwood wrote: > Thanks, not as much as I was hoping for but still extremely helpful. > > > Can you, or others have a look at this: http://cuddletech.com/arc_summary.html > > This is a PERL script that uses kstats to drum up a report such as the > following: > > System Memory: > Physical RAM: 32759 MB > Free Memory : 10230 MB > LotsFree: 511 MB > > ARC Size: > Current Size: 7989 MB (arcsize) > Target Size (Adaptive): 8192 MB (c) > Min Size (Hard Limit): 1024 MB (zfs_arc_min) > Max Size (Hard Limit): 8192 MB (zfs_arc_max) > > ARC Size Breakdown: > Most Recently Used Cache Size: 13% 1087 MB (p) > Most Frequently Used Cache Size: 86% 7104 MB (c-p) > > ARC Efficency: > Cache Access Total: 3947194710 > Cache Hit Ratio: 99% 3944674329 > Cache Miss Ratio: 0% 2520381 > > Data Demand Efficiency: 99% > Data Prefetch Efficiency: 69% > > CACHE HITS BY CACHE LIST: > Anon: 0% 16730069 > Most Frequently Used: 99% 3915830091 (mfu) > Most Recently Used: 0% 10490502 (mru) > Most Frequently Used Ghost: 0% 439554 (mfu_ghost) > Most Recently Used Ghost: 0% 1184113 (mru_ghost) > CACHE HITS BY DATA TYPE: > Demand Data: 99% 3914527790 > Prefetch Data: 0% 2447831 > Demand Metadata: 0% 10709326 > Prefetch Metadata: 0% 16989382 > CACHE MISSES BY DATA TYPE: > Demand Data: 45% 1144679 > Prefetch Data: 42% 1068975 > Demand Metadata: 5% 132649 > Prefetch Metadata: 6% 174078 > --------------------------------------------- > > > Feedback and input is welcome, in particular if I'm mischarrectorizing data. > > benr. > > > 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
