[lustre-discuss] "getting" ldlm_enqueue_min

[Thomas Roth]

Thank you, Malcolm.

Indeed I found my ldlm_enqueue_min - file, in /sys/module/ptlrpc/parameters ;-)

Actually I was reading the Wiki article, and thought about changing the timeout parameters on our system.
But I'm not sure about "echo 300 > /sys/module/ptlrpc/parameters/ldlm_enqueue_min" on our 2.5.3 
production system - though that seems to work in Lustre 2.9 without harsh consequences.
So I hope this LUDOC ticket gets resolved.

Cheers,
Thomas

On 03/29/2017 11:48 PM, Cowe, Malcolm J wrote:
> The Lustre manual suggests that the syntax should be:
>
> 	lctl set_param -P <fsname>.sys.ldlm_enqueue_min=100
>
> … but this doesn’t work on my own environment, and a quick scan of JIRA tickets and the web indicates that these settings are no longer applied through lctl parameters. Instead, they are options for the ptlrpc kernel module. The relevant JIRA ticket is:
>
> 	https://jira.hpdd.intel.com/browse/LUDOC-333
>
> There’s an article on the lustre.org wiki that has an explanation:
>
> 	http://wiki.lustre.org/Lustre_Resiliency:_Understanding_Lustre_Message_Loss_and_Tuning_for_Resiliency
>
> One of the examples mentioned there is as follows:
>
> options ptlrpc at_max=400
> options ptlrpc at_min=40
> options ptlrpc ldlm_enqueue_min=260
>
>
> Malcolm.
>
> On 30/3/17, 1:39 am, "lustre-discuss on behalf of Thomas Roth" <lustre-discuss-bounces at lists.lustre.org on behalf of t.roth at gsi.de> wrote:
>
>     Hi all,
>
>     I found that I can set 'ldlm_enqueue_min', but not read it.
>     At least
>      > lctl set_param -P ldlm_enqueue_min=100
>     results in no errors but just 'Lustre: Setting parameter general.ldlm_enqueue_min in log params'
>
>     But
>      > lctl get_param  ldlm_enqueue_min
>      > error: get_param: param_path 'ldlm_enqueue_min': No such file or directory
>
>     Correct: all the timeouts are found in /proc/sys/lustre/, but there is no 'ldlm_enqueue_min' (nor anywhere else in /proc)
>
>     This happens both on 2.5.3 and 2.9
>
>     Did I misunderstand something here, or are we missing a parameter?
>
>
>     Regards,
>     Thomas
>
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