ZFS tuning [was: hardware for home use large storage]

[jhell]

On Tue, 16 Feb 2010 12:59, freebsd@ wrote:
> On Tue, Feb 16, 2010 at 11:06:43AM -0600, Barry Pederson wrote:
>> On 2/15/10 7:49 PM, jhell wrote:
>>
>>> As I make final modifications to the script I will keep the below URLs
>>> updated and welcome any bug reports or modification requests to me
>>> personally.
>>>
>>> Here is the URLs:
>>> http://jhell.googlecode.com/files/arc_summary.pl
>>> http://jhell.googlecode.com/files/arc_summary.pl.asc
>>
>> Nice.  How about including relevant lines from /boot/loader.conf,
>> maybe something like this tacked on the end of the script (excuse my
>> Perl, I'm a Python guy).
>>
>> ----
>> #### Loader Settings #############
>> open(LOADER, '/boot/loader.conf');
>> print "\n/boot/loader.conf settings:\n";
>> while (<LOADER>){
>>     chomp;
>>     if (/^\s*(zfs|vfs\.zfs|vm\.kmem)/){
>>         print "\t$_\n";
>>     }
>> }
>> ----
>>
>> Yes, it should more or less duplicate the sysctl values, but it may
>> make it more obvious where the settings are coming from, or if the
>> user has bad or ignored settings
>
> Major problems with the above code:
>
> 1) Opens /boot/loader.conf for rw access; should be read-only
> 2) Makes the assumption /boot/loader.conf exists
> 3) Does not close the fd
> 4) Excessively quotes variables for no justified reason
> 5) Makes some bad assumptions about the contents of the file (ex.
>   comments with the word "zfs" in them would match)
>
> The code should really be something like what's below.  This should
> be much more manageable as well (@tunables that is), although I always
> worry when using grep()...
>
>

Very nice!,

Ill keep this for reference later on. This might just come in handy at 
some point.

But for the sake of arc_summary.pl I feel this is beyond the scope of what 
its intended use is. See previous email in response to Barry.

Thanks Jeremy

-- 

  jhell