[Qgis-user] [EXTERNAL] Re: Geopackage slow on NAS if not read-only
Jorge Gustavo Rocha
jgr at geomaster.pt
Thu Mar 16 04:47:23 PDT 2023
Hi,
For data storage and manipulation databases are suitable. Files are not.
Geopackages are wonderful to transfer data between systems or to archive
an entire project (snapshot of data, styles and the project itself).
Regards,
Jorge
On 16/03/23 11:30, Árni Geirsson via QGIS-User wrote:
> Thank you Jarosław. Isn't it strange that this was discussed 5 years
> ago and SMB file sharing is very common? Would a linux based NAS be
> able to use another protocol? What are my options for file based data
> sharing in QGIS? Abandoning geopackages is not a realistic option for
> me, but I could get a different kind of NAS unit, if that helps, what
> kind then? What amazes me is how little I see this discussed. There
> was a message in this thread this morning from Thomas Struller, but I
> am not sure it is about the same root problem, maybe Thomas can
> elaborate.
> Should this perhaps be discussed in another forum, closer to the
> development of geopackage/sqlite?
>
> Árni Geirsson
>
> On Thu, 16 Mar 2023 at 09:52, Sadowski Jarosław
> <jaroslaw.sadowski at cpk.pl> wrote:
>
> Long story short: gpkg is bad idea for network drives as SMB/NAS etc
>
> Sources:
> Write-Ahead Logging (sqlite.org)
> <https://www.sqlite.org/wal.html#advantages>
>
> writing gpkg and sqlite on samba shares fails · Issue #628 ·
> r-spatial/sf · GitHub <https://github.com/r-spatial/sf/issues/628>
>
>
> *_________________________________*
>
> *Jarosław Sadowski*
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> *From:*QGIS-User <qgis-user-bounces at lists.osgeo.org> *On Behalf Of
> *Árni Geirsson via QGIS-User
> *Sent:* Thursday, March 16, 2023 10:18 AM
> *To:* jhubbslist at att.net
> *Cc:* qgis-user at lists.osgeo.org
> *Subject:* [EXTERNAL] Re: [Qgis-user] Geopackage slow on NAS if
> not read-only
>
> UWAGA: Ta wiadomość pochodzi spoza CPK Sp. z o.o. Proszę pomóż
> zadbać o bezpieczeństwo naszej organizacji. Zastanów się, zanim
> otworzysz link lub załącznik.
>
> Yes, as far as I know, the NAS unit uses SMB as the file sharing
> protocol. I used another NAS from QNAP before this one, also using
> SMB and with the same problem. I thought pretty much all of the
> Linux based NAS units were using SMB and if that is the problem,
> it should be widespread, but I don't see any signs of that. Is SMB
> a problem for geopackage?
>
> I did a quick test in QGIS: A dataset of 178.000 line features is
> rendered in about 1 second from a read only geopackage. When I
> remove the read only flag, it is rendered in about 5 seconds.
>
> If I store the geopackage on the local hard drive, the problem
> disappears, read-write or read-only does not matter.
>
> I have had suspicions about SMB being part of the problem but I
> don't know enough about file access deep down in the operating
> system to understand it.
>
> Árni Geirsson
>
> On Thu, 16 Mar 2023 at 01:45, jhubbslist--- via QGIS-User
> <qgis-user at lists.osgeo.org <mailto:qgis-user at lists.osgeo.org>> wrote:
>
> Árni -
>
> Are you using SMB/CIFS to access this NAS, and are you using
> wifi or Ethernet to connect to it?
>
> - Jeff
>
> On 3/15/23 3:30 PM, Árni Geirsson via QGIS-User wrote:
>
> Hello all QGIS and geopackage users.
>
> I store my geopackages on a Synology RackStation NAS unit,
> like all other documents that are kept on a shared drive
> in the office. For larger datasets, the rendering is very
> slow, unless I open the properties dialog for the file in
> Windows and check the read only box. After that, the
> features are rendered blazingly fast. Nothing else is
> changed to see the dramatic difference in the rendering
> speed. Luckily, I don't need to edit many of the larger
> datasets, such as road networks and elevation contours and
> the geopackage can be kept read only. Shapefiles are not
> affected.
>
> What explains this and does anyone know how to solve
> the problem?
>
> Do other users experience this?
>
> Árni Geirsson
>
>
>
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--
Jorge Gustavo Rocha
Geomaster, LDA
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