[zfs-discuss] Re: Very poor write speeds

Gordan Bobic gordan.bobic at gmail.com
Tue Jan 7 12:05:40 EST 2014


Unmount all ZFS FS-es, rmmod zfs, modprobe zfs, remount. That should do it.



On Tue, Jan 7, 2014 at 5:03 PM, Ian Worthington <ian.s.worthington at gmail.com
> wrote:

> Finding it difficult to do that.
>
> Tried various values writing to /sys/module/zfs/parameters/zfs_arc_max as
> well as the /proc/sys/vm/drop_caches but don't seem to be able to eliminate
> the cache effect.
>
> Any suggestions?
>
> i
>
>
> On Monday, January 6, 2014 4:03:14 PM UTC-5, Gordan Bobic wrote:
>>
>> My point was that your read speeds could have been affected by read cache
>> being primed from the write. You need to drop the ARC contents.
>>
>> Ian Worthington <ian.s.wo... at gmail.com> wrote:
>>
>> I didn't.  But the cache should speed it up not slow it down I think.
>>
>> But a good idea anyway What's the best way of doing that?  I'm seeing:
>>
>> sudo tee /proc/sys/vm/drop_caches
>>
>> but I'm not sure its having much effect on my free -m figures.
>>
>> i
>>
>>
>>
>> On Monday, January 6, 2014 1:56:41 PM UTC-5, Gordan Bobic wrote:
>>>
>>> Did you drop all the caches between writing and reading?
>>>
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