High fragmentation on zpool log

[InterNetX - Juergen Gotteswinter]

Am 27.11.2015 um 17:18 schrieb Kai Gallasch:
> On 27.11.2015 16:49 InterNetX - Juergen Gotteswinter wrote:
>> Your SSDS are not really attached as Zil ?
> 
> Sorry. Due to copying&pasting a condensed version of zpool list -v, I
> forgot to paste a line.. so this is the corrected version:
> 
> Sorry,
> Kai.
> 

:)

i think this is caused by the size of your Zil, dunno if its really
something to care about ( i whould not worry about). More problematic
(regarding SSD Lifetime) is the dual use of SSD for ZIL / L2. Your Flash
Drives get hammered with writes from 2 Sides. Write Caching, and L2 Feed
ing.

> 
> (zpool list -v output, ommited columns: EXPANDSZ.,DEDUP,
> HEALTH, ALTROOT)
> 
> NAME                             SIZE  ALLOC   FREE  FRAG  CAP
> rpool                           7.25T   440G  6.82T    4%   5%
>   mirror                        1.81T   110G  1.71T    4%   5%
>    gpt/rpool-WMC160D0SVZE          -      -      -      -    -
>    gpt/rpool-WMC160D8MJPD          -      -      -      -    -
>   mirror                        1.81T   110G  1.70T    4%   5%
>    gpt/rpool-WMC160D9DLL2          -      -      -      -    -
>    gpt/rpool-WMC160D23CWA          -      -      -      -    -
>   mirror                        1.81T   110G  1.71T    4%   5%
>    gpt/rpool-WMC160D94930          -      -      -      -    -
>    gpt/rpool-WMC160D9V5LW          -      -      -      -    -
>   mirror                        1.81T   110G  1.71T    4%   5%
>    gpt/rpool-WMC160D9ZV0S          -      -      -      -    -
>    gpt/rpool-WMC160D5HFT6          -      -      -      -    -
> logs
>   mirror                        7.94G  43.2M  7.90G   85%   0%
>    gpt/log-BTTV523401U4100FGN      -      -      -      -    -
>    gpt/log-BTTV5234003K100FGN      -      -      -      -    -
> cache                              -      -      -      -    -
>   gpt/cache-BTTV5234003K100FGN  85.2G   142G  16.0E    0%   166%
>   gpt/cache-BTTV523401U4100FGN  85.2G   172G  16.0E    0%   202%
> 
> 
> 
> 
>