On 1/18/23 10:54, Rob Sargent wrote:
On 1/18/23 09:38, HECTOR INGERTO wrote:
I wanted to understand the underlying issue.
I use ZFS snapshots instead of a “correct” backup because with only two
machines it allows me to have backups in the main machine and in the
secondary too that acts as
On 1/18/23 09:38, HECTOR INGERTO wrote:
I wanted to understand the underlying issue.
I use ZFS snapshots instead of a “correct” backup because with only
two machines it allows me to have backups in the main machine and in
the secondary too that acts as hotspare at the same time.
To
<mailto:pgsql-gene...@postgresql.org>
Asunto: Re: Are ZFS snapshots unsafe when PGSQL is spreading through multiple
zpools?
On Tue, 2023-01-17 at 15:22 +, HECTOR INGERTO wrote:
> > Another case: a transaction COMMITs, and a slightly later transaction reads
> > the data
>
On Tue, 2023-01-17 at 15:22 +, HECTOR INGERTO wrote:
> > Another case: a transaction COMMITs, and a slightly later transaction reads
> > the data
> > and sets a hint bit. If the snapshot of the file system with the data
> > directory in it
> > is slightly later than the snapshot of the file
On Tue, Jan 17, 2023 at 03:22:02PM +, HECTOR INGERTO wrote:
> > Another case: a transaction COMMITs, and a slightly later transaction reads
> the data
> > and sets a hint bit. If the snapshot of the file system with the data
> directory in it
> > is slightly later than the snapshot of the
> Another case: a transaction COMMITs, and a slightly later transaction reads
> the data
> and sets a hint bit. If the snapshot of the file system with the data
> directory in it
> is slightly later than the snapshot of the file system with "pg_wal", the
> COMMIT might
> not be part of the
On Mon, 2023-01-16 at 14:37 +, HECTOR INGERTO wrote:
> > The database relies on the data being consistent when it performs crash
> > recovery.
> > Imagine that a checkpoint is running while you take your snapshot. The
> > checkpoint
> > syncs a data file with a new row to disk. Then it
On Mon, Jan 16, 2023 at 3:37 PM HECTOR INGERTO
wrote:
> > The database relies on the data being consistent when it performs crash
> recovery.
> > Imagine that a checkpoint is running while you take your snapshot. The
> checkpoint
> > syncs a data file with a new row to disk. Then it writes a
> On 16 Jan 2023, at 15:37, HECTOR INGERTO wrote:
>
> > The database relies on the data being consistent when it performs crash
> > recovery.
> > Imagine that a checkpoint is running while you take your snapshot. The
> > checkpoint
> > syncs a data file with a new row to disk. Then it
> The database relies on the data being consistent when it performs crash
> recovery.
> Imagine that a checkpoint is running while you take your snapshot. The
> checkpoint
> syncs a data file with a new row to disk. Then it writes a WAL record and
> updates
> the control file. Now imagine
On Mon, 2023-01-16 at 08:41 +, HECTOR INGERTO wrote:
> I have understood I shall not do it, but could the technical details be
> discussed about
> why silent DB corruption can occur with non-atomical snapshots?
The database relies on the data being consistent when it performs crash
I have understood I shall not do it, but could the technical details be
discussed about why silent DB corruption can occur with non-atomical snapshots?
er.net>
*Enviado: *domingo, 15 de enero de 2023 20:36
*Para: *HECTOR INGERTO <mailto:hector_...@hotmail.com>
*CC: *pgsql-gene...@postgresql.org
*Asunto: *Re: Are ZFS snapshots unsafe when PGSQL is spreading through
multiple zpools?
On Sun, Jan 15, 2023 at 8:18 PM HECTOR INGERTO wrote:
ZFS snapshots unsafe when PGSQL is spreading through multiple
zpools?
On Sun, Jan 15, 2023 at 8:18 PM HECTOR INGERTO
mailto:hector_...@hotmail.com>> wrote:
Hello everybody,
I’m using PostgreSQL on openZFS. I use ZFS snapshots as a backup + hotspare
method.
>From man zfs-snapshot: “
On Sun, Jan 15, 2023 at 10:57 PM HECTOR INGERTO
wrote:
>
>
> > But you cannot and should not rely on snapshots alone
>
>
>
> That’s only for non atomic (multiple pools) snapshots. Isn’t?
>
Right. For single-filesystem installs it should be fine. Just make sure it
has both the data and the WAL
On Sun, Jan 15, 2023 at 8:18 PM HECTOR INGERTO
wrote:
> Hello everybody,
>
>
>
> I’m using PostgreSQL on openZFS. I use ZFS snapshots as a backup +
> hotspare method.
>
>
>
> From man zfs-snapshot: “Snapshots are taken atomically, so that all
> snapshots correspond to the same moment in time.”
Hello everybody,
I’m using PostgreSQL on openZFS. I use ZFS snapshots as a backup + hotspare
method.
>From man zfs-snapshot: “Snapshots are taken atomically, so that all snapshots
>correspond to the same moment in time.” So if a PSQL instance is started from
>a zfs snapshot, it will start to
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