hi,
we have isolated the problem (meanwhile some hardware upgrade and code
optimization helped to limit the problem).
it happens when many request (HTTP over apache) comes to a non existent
file.
With 30 concurrent request to the same non existing file cause the load
go high without limit.
Same requests on existing files works fine.
I have tried to simulate che apache access to file excluding apache with
repeated command on files with the same parallelism (30):
- with ls works fine, file exists or not
- with stat works fine, file exists or not
- with xattr load go up, file exists or not
thank you
Il 05/10/2020 19.45, Marco Lerda - FOREACH S.R.L. ha scritto:
hi,
we use glusterfs on a php application that have many small php files
images etc...
We use glusterfs in replication mode.
We have 2 nodes connected in fiber with 100MBps and less than 1 ms
latency.
We have also an arbiter on slower network (but the issue is there also
without the arbiter).
When we copy a directory (cp command) with many files, cpu usage and
load explode raplidly,
our application become inaccessible until the copy ends.
I wonder if is that normal or we have done something wrong.
I know that glusterfs is not indicated with many small files, and I
know that it slow down,
but I want to avoid that a simple copy of a directory will put down
out application.
Any suggestion?
Thanks a lot
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Marco Lerda
FOREACH S.R.L.
Via Laghi di Avigliana 115, 12022 - Busca (CN)
Telefono: 0171-1984102
Centralino/Fax: 0171-1984100
Email: marco.lerda@xxxxxxxxxx
Web: http://www.foreach.it
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