From: Seena Fallah
Sent: 04 November 2020 19:01:18
To: Alexander E. Patrakov
Cc: ceph-users
Subject: [ceph-users] Re: Ceph flash deployment
I see in this thread that someone is saying that bluestore is only works
good with cfq scheduler:
http://lists.ceph.com/pipermail/ceph-users
I see in this thread that someone is saying that bluestore is only works
good with cfq scheduler:
http://lists.ceph.com/pipermail/ceph-users-ceph.com/2018-November/031063.html
For readahead, do you have any measurements to see how I can measure my
workload to see if I should increase it or not?
With the latest kernel, this is not valid for all-flash clusters.
Simply because cfq is not an option at all there, and readahead
usefulness depends on your workload (in other words, it can help or
hurt) and therefore cannot be included in a universally-applicable set
of tuning recommendations.
Thanks for your useful information.
Can you please also point to the kernel and disk configuration that are
still valid for bluestore or not? I mean the read_ahead_kb and disk
scheduler.
Thanks.
On Tue, Nov 3, 2020 at 10:55 PM Alexander E. Patrakov
wrote:
> On Tue, Nov 3, 2020 at 6:30 AM
On Tue, Nov 3, 2020 at 6:30 AM Seena Fallah wrote:
>
> Hi all,
>
> Does this guid is still valid for a bluestore deployment with nautilus or
> octopus?
> https://tracker.ceph.com/projects/ceph/wiki/Tuning_for_All_Flash_Deployments
Some of the guidance is of course outdated.
E.g., at the time of
