16 exabytes of L2ARC?

[krichy at tvnetwork.hu]

See https://bugs.freenas.org/issues/6239

Kojedzinszky Richard
Euronet Magyarorszag Informatika Zrt.

On Sat, 20 Dec 2014, Nikolay Denev wrote:

> Date: Sat, 20 Dec 2014 15:32:38 +0100
> From: Nikolay Denev <ndenev at gmail.com>
> To: "Nagy, Attila" <bra at fsn.hu>
> Cc: freebsd-fs <freebsd-fs at freebsd.org>
> Subject: Re: 16 exabytes of L2ARC?
> 
> On Sat, Sep 27, 2014 at 11:13 AM, Nagy, Attila <bra at fsn.hu> wrote:
>
>> On 09/26/14 14:49, Nagy, Attila wrote:
>>
>>> Hi,
>>>
>>> Running stable/10 at r271944:
>>> # zpool iostat -v
>>>                capacity     operations    bandwidth
>>> pool        alloc   free   read  write   read  write
>>> ----------  -----  -----  -----  -----  -----  -----
>>> data        17.3T  40.7T    165  1.24K  1.63M  90.8M
>>>   da0       4.31T  10.2T     41    318   418K  22.7M
>>>   da1       4.32T  10.2T     41    317   416K  22.7M
>>>   da2       4.32T  10.2T     41    317   416K  22.7M
>>>   da3       4.31T  10.2T     41    317   418K  22.7M
>>> cache           -      -      -      -      -      -
>>>   ada0       513G  16.0E    222    179  1.05M  2.79M
>>>   ada1       511G  16.0E    222    180  1.05M  2.80M
>>> ----------  -----  -----  -----  -----  -----  -----
>>>
>>> # egrep 'ada.*MB' /var/run/dmesg.boot
>>> ada0: 600.000MB/s transfers (SATA 3.x, UDMA5, PIO 512bytes)
>>> ada0: 381554MB (781422768 512 byte sectors: 16H 63S/T 16383C)
>>> ada1: 600.000MB/s transfers (SATA 3.x, UDMA5, PIO 512bytes)
>>> ada1: 381554MB (781422768 512 byte sectors: 16H 63S/T 16383C)
>>>
>> I've removed the cache devices and re-added them, now it's fine:
>> cache           -      -      -      -      -      -
>>   ada0       355M   372G     24      0   151K      0
>>   ada1       345M   372G     12    505  71.7K  2.79M
>>
>>
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>
> Hi,
>
> Did you figure out the root cause of this?
> I seem to be having the same issue:
>
>
> [14:31][root at nas:~]#zpool iostat -v | grep -A1 cache
> cache             -      -      -      -      -      -
>  ada4p1       215G  16.0E      9      3   107K   322K
>
> uname -a : FreeBSD nas.home.lan 10.1-STABLE FreeBSD 10.1-STABLE #14
> r274549: Sat Nov 15 14:43:56 UTC 2014
> root at nas.home.lan:/usr/obj/usr/src/sys/NAS
> amd64
>
>
> --Nikolay
> _______________________________________________
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>