Performance difference between UFS and ZFS with NFS

[Eric Browning]

Steven,

I've tried to 4K align these SSDs with gnop but they are currently ashift
9.  Pool layout is just 4 drives in a zfs stripe.  I've also tried raidz1
with no noticeable performance impacts other than a loss of space for
parity.


On Mon, Nov 25, 2013 at 11:35 AM, Steven Hartland
<killing at multiplay.co.uk>wrote:

> Just tried this here and I'm seeing CPU saturation from dd, is this
> your case too?
>
> Switching to:
> /usr/bin/time -h dd if=/dev/zero of=/home/smh/testfile bs=1m count=2930
>
> Iit changed from:
> 3072000000 bytes transferred in 170.102366 secs (18059714 bytes/sec)
>        2m50.48s real           1.05s user              2m48.28s sys
>
> to:
> 3072327680 bytes transferred in 14.094856 secs (217975102 bytes/sec)
>        15.19s real             0.00s user              4.87s sys
>
>    Regards
>    Steve
> ----- Original Message ----- From: "Steven Hartland" <
> killing at multiplay.co.uk>
> To: "Eric Browning" <ericbrowning at skaggscatholiccenter.org>
> Cc: "FreeBSD FS" <freebsd-fs at freebsd.org>
> Sent: Monday, November 25, 2013 6:20 PM
> Subject: Re: Performance difference between UFS and ZFS with NFS
>
>
>
>  And whats your ZFS pool layout and ashift?
>>
>>    Regards
>>    Steve
>> ----- Original Message ----- From: "Eric Browning" <ericbrowning@
>> skaggscatholiccenter.org>
>>
>>
>>  I am using /dev/zero
>>>
>>> /usr/bin/time -h dd if=/dev/zero of=sometestfile bs=1024 count=3000000
>>>
>>>
>>> On Sun, Nov 24, 2013 at 12:31 PM, krad <kraduk at gmail.com> wrote:
>>>
>>>  I was thinking the same, if it was using /dev/zero as an input any
>>>> compression would skew the results a little.
>>>>
>>>>
>>>> On 24 November 2013 15:15, Steven Hartland <killing at multiplay.co.uk>
>>>> wrote:
>>>>
>>>>  ----- Original Message ----- From: "Eric Browning"
>>>>>
>>>>>
>>>>>
>>>>>  On a side note I forgot that I had used dd to test the disk
>>>>> performance a
>>>>>
>>>>>> while ago when I was using ZFS.
>>>>>>
>>>>>> ZFS performance:
>>>>>> 3072000000 bytes transferred in 34.167480 secs (89910055 bytes/sec)
>>>>>> 34.17s real 0.61s user 31.89s sys
>>>>>>
>>>>>> UFS performance:
>>>>>> 3072000000 bytes transferred in 11.848883 secs (259264942 bytes/sec)
>>>>>> 11.85s real 0.58s user 11.25s sys
>>>>>>
>>>>>> Again, even with dd performance is about 3x faster with UFS with the
>>>>>> same
>>>>>> disks.
>>>>>>
>>>>>>
>>>>> Interesting, what was you command exactly?
>>>>>
>>>>>    Regards
>>>>>    Steve
>>>>>
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>>>>
>>>>
>>>
>>> --
>>> Eric Browning
>>> Systems Administrator
>>> 801-984-7623
>>>
>>> Skaggs Catholic Center
>>> Juan Diego Catholic High School
>>> Saint John the Baptist Middle
>>> Saint John the Baptist Elementary
>>>
>>>
>> ================================================
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>
> ================================================
> This e.mail is private and confidential between Multiplay (UK) Ltd. and
> the person or entity to whom it is addressed. In the event of misdirection,
> the recipient is prohibited from using, copying, printing or otherwise
> disseminating it or any information contained in it.
> In the event of misdirection, illegible or incomplete transmission please
> telephone +44 845 868 1337
> or return the E.mail to postmaster at multiplay.co.uk.
>
>


-- 
Eric Browning
Systems Administrator
801-984-7623

Skaggs Catholic Center
Juan Diego Catholic High School
Saint John the Baptist Middle
Saint John the Baptist Elementary