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 =E2=80=98zpool offline=E2=80= =99 command. Everything seemed to go ok anyway. The system started resilvering, etc. = When is =E2=80=98zpool required=E2=80=99? 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: >=20 > Hi! >=20 >> How should I label and prepare the drives for ZFS? Someone ought to = write a ???cookbook??? on that! >=20 > Basically, what I once did, was this: >=20 > zpool create bck raidz2 ada2 ada3 ada4 ada5 ada6 ada7 ada8 ada9 >=20 > Therefore: raw disks, nothing else. >=20 >> Do I need to start the volume on a particular sector boundary? >>=20 >> Are the 4096 byte sector drives usable? >=20 > I think the default is now 4096 anyway. >=20 > = https://charsiurice.wordpress.com/2016/05/30/checking-ashift-on-existing-p= ools/ >=20 > describes the command to check for 4096 blocks: >=20 > zdb -C | grep ashift >=20 > If it displays >=20 > ashift: 9 >=20 > the blocks are 512 bytes. >=20 > If it displays >=20 > ashift: 12 >=20 > the block size is 4096. >=20 > --=20 > pi@opsec.eu +49 171 3101372 Now what ?
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