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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This is a cryptographically signed message in MIME format. --------------ms040305020201000706000708 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable 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]/ --------------ms040305020201000706000708 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC DdgwggagMIIEiKADAgECAhMA5EiKghDOXrvfxYxjITXYDdhIMA0GCSqGSIb3DQEBCwUAMIGL MQswCQYDVQQGEwJVUzEQMA4GA1UECAwHRmxvcmlkYTESMBAGA1UEBwwJTmljZXZpbGxlMRkw FwYDVQQKDBBDdWRhIFN5c3RlbXMgTExDMRgwFgYDVQQLDA9DdWRhIFN5c3RlbXMgQ0ExITAf 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