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Date:      Wed, 3 Jul 2019 08:51:23 -0500
From:      Karl Denninger <karl@denninger.net>
To:        freebsd-questions@freebsd.org
Subject:   Re: extremely slow disk I/O after updating to 12.0
Message-ID:  <9d31fb68-df3e-76d3-195d-0da9749b0b1d@denninger.net>
In-Reply-To: <alpine.BSF.2.21.9999.1907031505400.1251@enterprise.ximalas.info>
References:  <b76b814f-e440-67a9-5424-4e7c5d03d5ca@malikania.fr> <alpine.BSF.2.21.9999.1907031505400.1251@enterprise.ximalas.info>

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On 7/3/2019 08:42, Trond Endrest=C3=B8l wrote:
> On Wed, 3 Jul 2019 13:34+0200, David Demelier wrote:
>
>> zpool status indicates that the blocksize is erroneous and that I may =
expect
>> performance degradation. But that much is impressive. Can someone conf=
irm?
>>
>> # zpool status
>>   pool: tank
>>  state: ONLINE
>> status: One or more devices are configured to use a non-native block s=
ize.
>>         Expect reduced performance.
>> action: Replace affected devices with devices that support the
>>         configured block size, or migrate data to a properly configure=
d
>>         pool.
>>   scan: none requested
>> config:
>>
>>         NAME          STATE     READ WRITE CKSUM
>>         tank          ONLINE       0     0     0
>>           raidz1-0    ONLINE       0     0     0
>>             gpt/zfs0  ONLINE       0     0     0  block size: 512B con=
figured, 4096B native
>>             gpt/zfs1  ONLINE       0     0     0  block size: 512B con=
figured, 4096B native
>>
>> errors: No known data errors
>>
>>
>>
>> According to some googling, I must update those pools to change the bl=
ock
>> size. However there are no many articles on that so I'm a bit afraid o=
f doing
>> this. The zfs0 and zfs1 are in raidz.
>>
>> Any help is very welcome.

ashift=3D9 on a 4k native block device is going to do horrible things to
performance.=C2=A0 There's no way to change it on an existing pool, as th=
e
other respondent noted; you will have to back up the data on the pool,
destroy the pool and then re-create it.

Was this pool originally created with 512b disks and then the drives
were swapped out with a "replace" at some point for advanced-format units=
?

The only downside to using ashift=3D12 on a 512b drive is a modest amount=

of lost space in overhead, but given the risk that somewhere down the
line you will swap the disk for a 4k one, and if you do you get forced
to recreate the pool to get rid of the performance problem, I've had
ashift=3D12 set as a default for a very long time.

--=20
Karl Denninger
karl@denninger.net <mailto:karl@denninger.net>
/The Market Ticker/
/[S/MIME encrypted email preferred]/

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