Date: Mon, 15 Feb 2010 22:20:28 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> To: Alexander Leidinger <Alexander@Leidinger.net> Cc: freebsd-stable@freebsd.org, Jeremy Chadwick <freebsd@jdc.parodius.com> Subject: Re: ZFS tuning [was: hardware for home use large storage] Message-ID: <4B79BA9C.3020402@quip.cz> In-Reply-To: <20100215161105.14071eiflhc9le68@webmail.leidinger.net> References: <cf9b1ee01002150049o43fced71ucb5776a0a1eaf4cf@mail.gmail.com> <20100215090756.GA54764@icarus.home.lan> <20100215105000.101326yj01j0f64g@webmail.leidinger.net> <20100215122744.GA57382@icarus.home.lan> <20100215161105.14071eiflhc9le68@webmail.leidinger.net>
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This is a multi-part message in MIME format. --------------050007080204090204030503 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Alexander Leidinger wrote: [...] >> kstat.zfs.misc.arcstats.c >> kstat.zfs.misc.arcstats.c_min >> kstat.zfs.misc.arcstats.c_max > > c_max is vfs.zfs.arc_max, c_min is vfs.zfs.arc_min. > >> kstat.zfs.misc.arcstats.evict_skip >> kstat.zfs.misc.arcstats.memory_throttle_count >> kstat.zfs.misc.arcstats.size > > I'm not very sure about size and c... both represent some kind of > current size, but they are not the same. > > > About the tuning I would recommend to depend upon a more human readable > representation. I've seen someone posting something like this, but I do > not know how it was generated (some kind of script, but I do not know > where to get it). I think you are referring to this script: http://cuddletech.com/arc_summary/ and its FreeBSD version http://bitbucket.org/koie/arc_summary/changeset/dbe14d2cf52b/ It gives output like this: # arc_summary.sh System Memory: Physical RAM: 4978 MB Free Memory : 755 MB ARC Size: Current Size: 1028 MB (arcsize) Target Size (Adaptive): 1028 MB (c) Min Size (Hard Limit): 50 MB (zfs_arc_min) Max Size (Hard Limit): 1205 MB (zfs_arc_max) ARC Size Breakdown: Most Recently Used Cache Size: 93% 963 MB (p) Most Frequently Used Cache Size: 6% 65 MB (c-p) ARC Efficency: Cache Access Total: 358720716 Cache Hit Ratio: 97% 350351031 [Defined State for buffer] Cache Miss Ratio: 2% 8369685 [Undefined State for Buffer] REAL Hit Ratio: 76% 272917080 [MRU/MFU Hits Only] Data Demand Efficiency: 96% Data Prefetch Efficiency: 27% CACHE HITS BY CACHE LIST: Anon: 22% 77179355 [ New Customer, First Cache Hit ] Most Recently Used: 45% 158252587 (mru) [ Return Customer ] Most Frequently Used: 32% 114664493 (mfu) [ Frequent Customer ] Most Recently Used Ghost: 0% 9777 (mru_ghost) [ Return Customer Evicted, Now Back ] Most Frequently Used Ghost: 0% 244819 (mfu_ghost) [ Frequent Customer Evicted, Now Back ] CACHE HITS BY DATA TYPE: Demand Data: 1% 4375918 Prefetch Data: 0% 150148 Demand Metadata: 76% 267830502 Prefetch Metadata: 22% 77994463 CACHE MISSES BY DATA TYPE: Demand Data: 1% 135956 Prefetch Data: 4% 400434 Demand Metadata: 73% 6177748 Prefetch Metadata: 19% 1655547 --------------------------------------------- Another useful script is arcstat.pl from http://blogs.sun.com/realneel/entry/zfs_arc_statistics There are FreeBSD version floating around but I can't find a link to it, so I am sending it as attachment. It would be nice to have some "standardized" scripts for monitoring & debugging ZFS issues attached to FreeBSD Wiki page about ZFS tuning. Then everebody will use the same scripts, same output format. It will be easier to compare results in discussions etc. So if anybody of you have write permissions to Wiki, can you add those two scripts? (or make some better ;]) Understanding to tuning of ZFS is really hard with lack of documentation ;( Miroslav Lachman --------------050007080204090204030503 Content-Type: text/plain; name="arcstat.freebsd.pl.txt" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="arcstat.freebsd.pl.txt" IyEvdXNyL2Jpbi9wZXJsIC13CiMKIyBQcmludCBvdXQgWkZTIEFSQyBTdGF0aXN0aWNzIGV4 cG9ydGVkIHZpYSBrc3RhdCgxKQojIEZvciBhIGRlZmluaXRpb24gb2YgZmllbGRzLCBvciB1 c2FnZSwgdXNlIGFyY3RzdGF0LnBsIC12CiMKIyBBdXRob3I6IE5lZWxha2FudGggTmFkZ2ly IGh0dHA6Ly9ibG9ncy5zdW4uY29tL3JlYWxuZWVsCiMgQ29tbWVudHMvUXVlc3Rpb25zL0Zl ZWRiYWNrIHRvIG5lZWxfc3VuLmNvbSBvciBuZWVsX2dudS5vcmcKIwojIENEREwgSEVBREVS IFNUQVJUCiMgCiMgVGhlIGNvbnRlbnRzIG9mIHRoaXMgZmlsZSBhcmUgc3ViamVjdCB0byB0 aGUgdGVybXMgb2YgdGhlCiMgQ29tbW9uIERldmVsb3BtZW50IGFuZCBEaXN0cmlidXRpb24g TGljZW5zZSwgVmVyc2lvbiAxLjAgb25seQojICh0aGUgIkxpY2Vuc2UiKS4gIFlvdSBtYXkg bm90IHVzZSB0aGlzIGZpbGUgZXhjZXB0IGluIGNvbXBsaWFuY2UKIyB3aXRoIHRoZSBMaWNl 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