e correct settings
> > > *permanently* across restarts:
> > >
> > > 1) Prepare OSD on fresh HDD with ceph-volume lvm batch --prepare ...
> > > 2) Assign dm_cache to logical OSD volume created in step 1
> > > 3) Start OSD, restart OSDs, boot server ...
he to logical OSD volume created in step 1
> > > 3) Start OSD, restart OSDs, boot server ...
> > >
> > > I would assume that the HDD settings are burned into the OSD in step 1
> > > and will be used in all future (re-)starts without the need to do
> > > an
re-)starts without the need to do anything
> > despite the device being detected as non-rotational after step 2. Is this
> > assumption correct?
> >
> > Thanks and best regards,
> > =
> > Frank Schilder
> > AIT Risø Campus
> > Byg
Ok, further testing and thinking...
Frank, you mentioned about creating the osd without cache so that it'd
be picked up as HDD not SSD. Also back in this thread Aleksandr
mentioned that the parameter rotational in sysfs is used for this.
So I checked what this parameter is being set to with bcache
logging. The "config show" commands
> > will show what is in the config DB and not what is burned onto disk (and
> > actually used).
> >
> > Best regards,
> > =========
> > Frank Schilder
> > AIT Risø Campus
> > Bygning 109, rum S14
>
ly used).
>
> Best regards,
> =
> Frank Schilder
> AIT Risø Campus
> Bygning 109, rum S14
>
>
> From: Richard Bade
> Sent: 08 April 2022 00:08
> To: Frank Schilder
> Cc: Igor Fedotov; Ceph Users
> Subject
Just for completeness for anyone that is following this thread. Igor
added that setting in Octopus, so unfortunately I am unable to use it
as I am still on Nautilus.
Thanks,
Rich
On Wed, 6 Apr 2022 at 10:01, Richard Bade wrote:
>
> Thanks Igor for the tip. I'll see if I can use this to reduce th
Thanks, this should help me with some debugging around the setting
Igor suggested.
Rich
On Tue, 5 Apr 2022 at 21:20, Rudenko Aleksandr wrote:
>
> OSD uses sysfs device parameter "rotational" for detecting device type
> (HDD/SSD).
>
> You can see it:
>
> ceph osd metadata {osd_id}
>
> On 05.04.
Thanks Igor for the tip. I'll see if I can use this to reduce the
number of tweaks I need.
Rich
On Tue, 5 Apr 2022 at 21:26, Igor Fedotov wrote:
>
> Hi Richard,
>
> just FYI: one can use "bluestore debug enforce settings=hdd" config
> parameter to manually enforce HDD-related settings for a Blu
Hi Richard,
just FYI: one can use "bluestore debug enforce settings=hdd" config
parameter to manually enforce HDD-related settings for a BlueStore
Thanks,
Igor
On 4/5/2022 1:07 AM, Richard Bade wrote:
Hi Everyone,
I just wanted to share a discovery I made about running bluestore on
top of
OSD uses sysfs device parameter "rotational" for detecting device type
(HDD/SSD).
You can see it:
ceph osd metadata {osd_id}
On 05.04.2022, 11:49, "Richard Bade" wrote:
Hi Frank, yes I changed the device class to HDD but there seems to be some
smarts in the background that apply the
Hi Frank, yes I changed the device class to HDD but there seems to be some
smarts in the background that apply the different settings that are not
based on the class but some other internal mechanism.
However, I did apply the class after creating the osd, rather than during.
If someone knows how to
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