Hey,
thanks for writing. Sorry about the delay.
On 25/03/2020 00:25, Nir Soffer wrote:
> These settings mean:
>
>> performance.strict-o-direct: on
>> network.remote-dio: enable
>
> That you are using direct I/O both on the client and server side.
I changed them to off, to no avail. Yields the same results.
>> Writing inside the /gluster_bricks yields those 2GB/sec writes, Reading
>> the same.
>
> How did you test this?
I ran
dd if=/dev/zero of=testfile oflag=direct bs=1M status=progress
(with varying block sized) on
- the mounted gluster brick (/gluster_bricks...)
- the mounted gluster volume (/rhev.../mount/...)
- inside a running VM
I also switched it around and read an image file from the gluster volume
with the same speeds.
> Did you test reading from the storage on the server side using direct
> I/O? if not,
> you test accessing server buffer cache, which is pretty fast.
Which is where oflag comes in. I can confirm skipping that will results
in really, really fast io until the buffer is full. oflag=direct shows
~2gb on the raid, 200mb on gluster volume, still.
>> Reading inside the /rhev/data-center/mnt/glusterSD/ dir reads go down to
>> 366mb/sec while writes plummet to to 200mb/sec.
>
> This use direct I/O.
Even with the direct I/O turned on (which is off and yielding the same
results) this is way too slow for direct IO.
> Please share the commands/configuration files used to perform the tests.
>
> Adding storage folks that can help with analyzing this.
I am happy to oblige and supply and required logs or profiling
information if you'd be so kind to tell me which one, precisely.
Stay healthy!
--
Christian Reiss - [email protected] /"\ ASCII Ribbon
[email protected] \ / Campaign
X against HTML
WEB alpha-labs.net / \ in eMails
GPG Retrieval https://gpg.christian-reiss.de
GPG ID ABCD43C5, 0x44E29126ABCD43C5
GPG fingerprint = 9549 F537 2596 86BA 733C A4ED 44E2 9126 ABCD 43C5
"It's better to reign in hell than to serve in heaven.",
John Milton, Paradise lost.
_______________________________________________
Users mailing list -- [email protected]
To unsubscribe send an email to [email protected]
Privacy Statement: https://www.ovirt.org/privacy-policy.html
oVirt Code of Conduct:
https://www.ovirt.org/community/about/community-guidelines/
List Archives:
https://lists.ovirt.org/archives/list/[email protected]/message/UFWOW4ARBCYLIK3HEE4IHOAFLPGPM22P/
