Hi ZFSers,
I've been working on merging the Joyent arcstat enhancements with some of my own
and am now to the point where it is time to broaden the requirements gathering.
The result
is to be merged into the illumos tree.
arcstat is a perl script to show the value of ARC kstats as they change over
time. This is
similar to the ideas behind mpstat, iostat, vmstat, and friends.
The current usage is:
Usage: arcstat [-hvx] [-f fields] [-o file] [interval [count]]
Field definitions are as follows:
mtxmis : mutex_miss per second
arcsz : ARC size
mrug : MRU ghost list hits per second
l2hit% : L2ARC access hit percentage
mh% : Metadata hit percentage
l2miss% : L2ARC access miss percentage
read : Total ARC accesses per second
l2hsz : L2ARC header size
c : ARC target size
mfug : MFU ghost list hits per second
miss : ARC misses per second
dm% : Demand data miss percentage
hsz : ARC header size
dhit : Demand data hits per second
pread : Prefetch accesses per second
dread : Demand data accesses per second
l2miss : L2ARC misses per second
pmis : Prefetch misses per second
time : Time
l2bytes : Bytes read per second from the L2ARC
pm% : Prefetch miss percentage
mm% : Metadata miss percentage
hits : ARC reads per second
throt : Memory throttles per second
mfu : MFU list hits per second
l2read : Total L2ARC accesses per second
mmis : Metadata misses per second
rmis : recycle_miss per second
mhit : Metadata hits per second
dmis : Demand data misses per second
mru : MRU list hits per second
ph% : Prefetch hits percentage
eskip : evict_skip per second
l2size : L2ARC size
l2hits : L2ARC hits per second
hit% : ARC hit percentage
miss% : ARC miss percentage
dh% : Demand data hit percentage
mread : Metadata accesses per second
phit : Prefetch hits per second
Some questions for the community:
1. Should there be flag compatibility with vmstat, iostat, mpstat, and friends?
2. What is missing?
3. Is it ok if the man page explains the meanings of each field, even though it
might be many pages long?
4. Is there a common subset of columns that are regularly used that would
justify
a shortcut option? Or do we even need shortcuts? (eg -x)
5. Who wants to help with this little project?
--
Richard Elling
rich...@nexenta.com +1-760-896-4422
Nexenta European User Conference, Amsterdam, May 20
www.nexenta.com/corp/european-user-conference-2011
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