From nobody Sat Jan 11 11:03:59 2025 X-Original-To: freebsd-fs@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4YVbHm267nz5k4Kc for ; Sat, 11 Jan 2025 11:04:04 +0000 (UTC) (envelope-from SRS0=qBys=UD=klop.ws=ronald-lists@realworks.nl) Received: from smtp-relay-int.realworks.nl (smtp-relay-int.realworks.nl [194.109.157.24]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4YVbHl54SFz4G3Z for ; Sat, 11 Jan 2025 11:04:03 +0000 (UTC) (envelope-from SRS0=qBys=UD=klop.ws=ronald-lists@realworks.nl) Authentication-Results: mx1.freebsd.org; none Date: Sat, 11 Jan 2025 12:03:59 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=klop.ws; s=rw2; t=1736593441; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to; bh=7ouKzws2Sbs4lf1YzlcBB8GVUHHqWPxr+l2uIcB5qQE=; b=I+uy1sl/Sd6BMsF48Az4Q/v0Nz0y5YrMhG/5ICES5roIT5Tx99ioxrz0865tR8n4o5yISV azLqwIz/nspwoTB0IXtIyEm5Pkbb5VQT0YSMMgvt87ju+R/Pl+ocGpEYXQypeHKS/I+Is7 +ffvrzyzTZ2Mw7d36WNQsu0rjTPPNEbcuiS7CI9K/Crv6oWbfyHjEfpD+a6DTDXihmvhaA RH/fHJWx6vB/Jwj7rFY30KfQhkZ4d6QtP4wefjZo373JMYqbI/ijUhOvi9fUROBkpZosDb bUsczPgBtZj3CXGZaERVgsEXf4n2oMdwN46+/0wPT7fVZMlfg7l3uA+uzIzAiQ== From: Ronald Klop To: andy thomas Cc: freebsd-fs@freebsd.org, heasley Message-ID: <856588185.13572.1736593439701@localhost> In-Reply-To: Subject: Re: How can I tell when ZFS has finished creating a snapshot? List-Id: Filesystems List-Archive: https://lists.freebsd.org/archives/freebsd-fs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-fs@FreeBSD.org MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_13571_438639477.1736593439698" X-Mailer: Realworks (733.112) Importance: Normal X-Priority: 3 (Normal) X-Rspamd-Queue-Id: 4YVbHl54SFz4G3Z X-Spamd-Bar: ---- X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:3265, ipnet:194.109.0.0/16, country:NL] ------=_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 Datum: 11 januari 2025 11:40 Aan: heasley 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 For example:

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.

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.

Regard= s,
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 sn= apshot?

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:

    root@clustor2:~ # date
    Sat Jan 11 10:31:05 GMT 2025
    root@clustor2:~ # zfs list -t snapshot
    NAME        &nbs= p;            &= nbsp;        USED  AVAIL  = ;REFER  MOUNTPOINT
    clustor2/ma@2025-01-10_14.45.00   468M &n= bsp;    -  3.09T  -

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!

Andy

On Fri, 10 Jan 2025, heasley wrote:

> 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 fil= es in
> the snapshot are deleted or overwritten.
>
>


-----------------------------
Andy Thomas,
Time Domain Systems

Tel: +44 (0)7815 060872
https://www.time-domain.co.uk=




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