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.sadow...@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>
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*Jarosław Sadowski*
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*From:*QGIS-User <qgis-user-boun...@lists.osgeo.org> *On
Behalf Of *Árni Geirsson via QGIS-User
*Sent:* Thursday, March 16, 2023 10:18 AM
*To:* jhubbsl...@att.net
*Cc:* qgis-user@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@lists.osgeo.org
<mailto:qgis-user@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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