Dear Saanjeevb,
In order to analyze a customer issue I am working on a script that computes ARC
and L2ARc activities by interval.
My intention is to analyze caches efficiency as well as evictions. I would
appreciate more details :
about hits breakdown :
- Are m[fr]u_ghost_hits a subset of m[
G'Day Ben,
ARC visibility is important; did you see Neel's arcstat?:
http://www.solarisinternals.com/wiki/index.php/Arcstat
Try -x for various sizes, and -v for definitions.
On Thu, Aug 21, 2008 at 10:23:24AM -0700, Ben Rockwood wrote:
> Its a starting point anyway. The key is to try
On Thu, Aug 21, 2008 at 8:47 PM, Ben Rockwood <[EMAIL PROTECTED]> wrote:
> New version is available (v0.2) :
>
> * Fixes divide by zero,
> * includes tuning from /etc/system in output
> * if prefetch is disabled I explicitly say so.
> * Accounts for jacked anon count. Still need improvement he
New version is available (v0.2) :
* Fixes divide by zero,
* includes tuning from /etc/system in output
* if prefetch is disabled I explicitly say so.
* Accounts for jacked anon count. Still need improvement here.
* Added friendly explanations for MRU/MFU & Ghost lists counts.
Page and examp
Its a starting point anyway. The key is to try and draw useful conclusions
from the info to answer the torrent of "why is my ARC 30GB???"
There are several things I'm unclear on whether or not I'm properly
interpreting such as:
* As you state, the anon pages. Even the comment in code is, to
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 b
On 21 August, 2008 - Ben Rockwood sent me these 2,2K bytes:
> 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
> f
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 Me
Ben,
Here is an attempt.
c -> Is the total cache size (MRU + MFU)
p -> represents the limit of MRU
(c - p) -> represents the limit of MFU
c_max, c_min-> hard limits
size-> Total amount consumed by ARC
memory_throttle_count -> The number of times ZFS decided to
Would someone "in the know" be willing to write up (preferably blog) definitive
definitions/explanations of all the arcstats provided via kstat? I'm
struggling with proper interpretation of certain values, namely "p",
"memory_throttle_count", and the mru/mfu+ghost hit vs demand/prefetch hit
co
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