ZFS on labelled partitions

[krad]

It was a control thing again, if you were using a partition another
application could be using the drive on another partition, therefore zfs
couldn't guarantee exclusive use of the disk so had to be more careful in
the way it operated the drive. I think this meant I went into write through
mode like you say.

On 17 November 2015 at 08:22, Miroslav Lachman <000.fbsd at quip.cz> wrote:

> Patrick M. Hausen wrote on 11/17/2015 09:08:
>
>> Hi, all,
>>
>> Am 16.11.2015 um 22:19 schrieb Freddie Cash <fjwcash at gmail.com>:
>>>
>>> ​You label the disks as they are added to the system the first time.
>>> That
>>> way, you always know where each disk is located, and you only deal with
>>> the
>>> labels.
>>>
>>
>> we do the same for obvious reasons. But I always wonder about the possible
>> downsides, because ZFS documentation explicitly states:
>>
>>         ZFS operates on raw devices, so it is possible to create a
>> storage pool comprised of logical
>>         volumes, either software or hardware. This configuration is not
>> recommended, as ZFS works
>>         best when it uses raw physical devices. Using logical volumes
>> might sacrifice performance,
>>         reliability, or both, and should be avoided.
>>
>> (from http://docs.oracle.com/cd/E19253-01/819-5461/gbcik/index.html)
>>
>> Can anyone shed some lght on why not using raw devices might sacrifice
>> performance or reliability? Or is this just outdated folklore?
>>
>
> It was on Solaris but not on FreeBSD. If you were using partitions on
> Solaris the drive cache was disabled (or something like that, I am not 100%
> sure)
>
> Miroslav Lachman
>
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