Date: Sat, 11 Jan 2025 12:03:59 +0100 (CET) From: Ronald Klop <ronald-lists@klop.ws> To: andy thomas <andy@time-domain.co.uk> Cc: freebsd-fs@freebsd.org, heasley <heas@shrubbery.net> Subject: Re: How can I tell when ZFS has finished creating a snapshot? Message-ID: <856588185.13572.1736593439701@localhost> In-Reply-To: <alpine.BSF.2.22.395.2501111029130.63713@mail0.time-domain.net>
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------=_Part_13571_438639477.1736593439698 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable For example: After creating a snapshot you delete a file in the original file system. Th= e file is still in the snapshot. So the size of the file will be accounted = to the snapshot. Modifying a file will give similar effect. The =E2=80=98old=E2=80=99 parts = of the file are only available via the snapshot so will be accounted to the= snapshot. Regards,Ronald. Van: andy thomas <andy@time-domain.co.uk> Datum: 11 januari 2025 11:40 Aan: heasley <heas@shrubbery.net> CC: freebsd-fs@freebsd.org Onderwerp: Re: How can I tell when ZFS has finished creating a snapshot? >=20 >=20 > But what could be increasing the size of the snapshot after it was create= d? Right now, yesterday's snapshot made at 14:45 UTC (nearly 22 hours ago) = has grown to 468MB: >=20 > root@clustor2:~ # date > Sat Jan 11 10:31:05 GMT 2025 > root@clustor2:~ # zfs list -t snapshot > NAME USED AVAIL REFER MOUNTPOINT > clustor2/ma@2025-01-10_14.45.00 468M - 3.09T - >=20 > It's true the size this file system reported by 'zfs list' has increasesd= from 3.09TB yesterday to 3.10TB now (it's used for storing user data in an= HPC that currently has about 700 jobs running on it) but it's very strange= that a snapshot supposedly "set in stone" at the time it is created should= continue to grow afterwards! >=20 > Andy >=20 > On Fri, 10 Jan 2025, heasley wrote: >=20 > > Fri, Jan 10, 2025 at 06:52:43PM +0000, andy thomas: > >> Is there a way to find out the status of a snapshot creation? > > > > it should be near-instantaneous. "USED" would only change if files in > > the snapshot are deleted or overwritten. > > > > >=20 >=20 > ----------------------------- > Andy Thomas, > Time Domain Systems >=20 > Tel: +44 (0)7815 060872 > https://www.time-domain.co.uk >=20 >=20 >=20 >=20 >=20 ------=_Part_13571_438639477.1736593439698 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable <html><head></head><body>For example:<br class=3D"rw_extra"><br>After creat= ing a snapshot you delete a file in the original file system. The file is s= till in the snapshot. So the size of the file will be accounted to the snap= shot.<br class=3D"rw_extra"><br>Modifying a file will give similar effect. = The =E2=80=98old=E2=80=99 parts of the file are only available via the snap= shot so will be accounted to the snapshot.<br class=3D"rw_extra"><br>Regard= s,<br class=3D"rw_extra">Ronald.<br class=3D"rw_extra"><br><p><small><stron= g>Van:</strong> andy thomas <andy@time-domain.co.uk><br><strong>Datum= :</strong> 11 januari 2025 11:40<br><strong>Aan:</strong> heasley <heas@= shrubbery.net><br><strong>CC:</strong> freebsd-fs@freebsd.org<br><strong= >Onderwerp:</strong> Re: How can I tell when ZFS has finished creating a sn= apshot?<br></small></p><blockquote style=3D"margin-left: 5px; border-left: = 3px solid #ccc; margin-right: 0px; padding-left: 5px;"><div class=3D"Messag= eRFC822Viewer" id=3D"P"><!-- P --> <!-- processMimeMessage --><div class=3D"TextPlainViewer" id=3D"P.P"><!-- P= .P -->But what could be increasing the size of the snapshot after it was cr= eated? Right now, yesterday's snapshot made at 14:45 UTC (nearly 22 hours a= go) has grown to 468MB:<br> <br> root@clustor2:~ # date<br> Sat Jan 11 10:31:05 GMT 2025<br> root@clustor2:~ # zfs list -t snapshot<br> NAME &nbs= p; &= nbsp; USED AVAIL  = ;REFER MOUNTPOINT<br> clustor2/ma@2025-01-10_14.45.00 468M &n= bsp; - 3.09T -<br> <br> It's true the size this file system reported by 'zfs list' has increasesd f= rom 3.09TB yesterday to 3.10TB now (it's used for storing user data in an H= PC that currently has about 700 jobs running on it) but it's very strange t= hat a snapshot supposedly "set in stone" at the time it is created should c= ontinue to grow afterwards!<br> <br> Andy<br> <br> On Fri, 10 Jan 2025, heasley wrote:<br> <br> > Fri, Jan 10, 2025 at 06:52:43PM +0000, andy thomas:<br> >> Is there a way to find out the status of a snapshot creation?<br> ><br> > it should be near-instantaneous. "USED" would only change if fil= es in<br> > the snapshot are deleted or overwritten.<br> ><br> ><br> <br> <br> -----------------------------<br> Andy Thomas,<br> Time Domain Systems<br> <br> Tel: +44 (0)7815 060872<br> <a href=3D"https://www.time-domain.co.uk">https://www.time-domain.co.uk</a>= <br> <br> </div><!-- TextPlainViewer --> <hr> </div><!-- MessageRFC822Viewer --> </blockquote><br><br><br></body></html> ------=_Part_13571_438639477.1736593439698--
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