Date: Mon, 8 Feb 2021 10:09:55 -0800 From: joe mcguckin <joe@via.net> To: Kurt Jaeger <pi@freebsd.org> Cc: freebsd-current@freebsd.org Subject: When is 'zpool offline' required? Message-ID: <0ABC40B6-BB2E-43B3-B0B6-7BEA12D3F5F0@via.net> In-Reply-To: <X/3r1SssReAPWRUF@home.opsec.eu> References: <CF6CB87D-D1A4-4328-976D-31764C0BD1F2@via.net> <X/3r1SssReAPWRUF@home.opsec.eu>
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I was just playing around with a test ZFS system and was running through replacing a bad drive and I forgot to issue a ‘zpool offline’ command. Everything seemed to go ok anyway. The system started resilvering, etc. When is ‘zpool required’? Under what conditions can I omit it? Is there a dedicated mailing list for ZFS user questions? Thanks, Joe Joe McGuckin ViaNet Communications joe@via.net 650-207-0372 cell 650-213-1302 office 650-969-2124 fax > On Jan 12, 2021, at 10:35 AM, Kurt Jaeger <pi@freebsd.org> wrote: > > Hi! > >> How should I label and prepare the drives for ZFS? Someone ought to write a ???cookbook??? on that! > > Basically, what I once did, was this: > > zpool create bck raidz2 ada2 ada3 ada4 ada5 ada6 ada7 ada8 ada9 > > Therefore: raw disks, nothing else. > >> Do I need to start the volume on a particular sector boundary? >> >> Are the 4096 byte sector drives usable? > > I think the default is now 4096 anyway. > > https://charsiurice.wordpress.com/2016/05/30/checking-ashift-on-existing-pools/ > > describes the command to check for 4096 blocks: > > zdb -C | grep ashift > > If it displays > > ashift: 9 > > the blocks are 512 bytes. > > If it displays > > ashift: 12 > > the block size is 4096. > > -- > pi@opsec.eu +49 171 3101372 Now what ?help
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