[Bugs] [Bug 1418900] [RFE] Include few more options in virt file

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1418900



--- Comment #5 from Krutika Dhananjay <kdhananj at redhat.com> ---
Why are each of these individual options added?

1. performance.low-prio-threads=32
VM use cases involve more of reads and writes than any other operations. And
both of these are categorized as 'low_prio' operations by io-threads. Setting
low-prio-threads to 32 saw some improvement in performance in initial testing
done by Paul Cuzner.

2. cluster.locking-scheme=granular
This is needed for more granular locking during entry self-heal so that
parallel heal-info doesn't hang until heals are complete.

3. features.shard=on
This is needed to reduce heal-times of VM image files which are large files
whose size can range anywhere from a few GBs to TBs or even PBs.

4. cluster.shd-max-threads=8, cluster.shd-wait-qlength=10000
These are to leverage multi-threaded self-heal feature to get better heal
performance and minimise the effect of downtime on VM file consistency and
availability.

5. user.cifs=off
We support access to files in virt use case only through libgfapi and FUSE. So
we explicitly disable other methods of access such as cifs.

-- 
You are receiving this mail because:
You are on the CC list for the bug.
Unsubscribe from this bug https://bugzilla.redhat.com/token.cgi?t=On0pqdjBvS&a=cc_unsubscribe