[lustre-discuss] lustre 2.5.3 ost not draining

[Kurt Strosahl]

Will that let deletes happen against it?

w/r,
Kurt

----- Original Message -----
From: "aik" <aik at fnal.gov>
To: "Kurt Strosahl" <strosahl at jlab.org>
Cc: "aik" <aik at fnal.gov>, "Sean Brisbane" <sean.brisbane at physics.ox.ac.uk>, lustre-discuss at lists.lustre.org
Sent: Friday, July 10, 2015 11:52:00 AM
Subject: Re: [lustre-discuss] lustre 2.5.3 ost not draining

Hi Kurt,

to keep traffic from almost full OST we usually set ost in degraded mode like described in manual:

> Handling Degraded OST RAID Arrays

> To mark the OST as degraded, use:
> lctl set_param obdfilter.{OST_name}.degraded=1

Alex.

On Jul 10, 2015, at 10:13 AM, Kurt Strosahl <strosahl at jlab.org> wrote:

> No, I'm aware of why the ost is getting new writes... it is because I had to set the qos_threshold_rr to 100 due to https://jira.hpdd.intel.com/browse/LU-5778  (I have an ost that has to be ignored due to terrible write performance...)
> 
> w/r,
> Kurt
> 
> ----- Original Message -----
> From: "Sean Brisbane" <sean.brisbane at physics.ox.ac.uk>
> To: "Kurt Strosahl" <strosahl at jlab.org>
> Cc: "Patrick Farrell" <paf at cray.com>, "lustre-discuss at lists.lustre.org" <lustre-discuss at lists.lustre.org>
> Sent: Friday, July 10, 2015 11:04:27 AM
> Subject: RE: [lustre-discuss] lustre 2.5.3 ost not draining
> 
> Dear Kurt,
> 
> Apologies.  After leaving it some number of days it did *not* clean itself up, but I feel that some number of days is long enough to verify that it is a problem.
> 
> Sounds like you have another issue if the OST is not being marked as full and writes are not being re-allocated to other OSTS .  I also have that second issue on my system as well and I have only workarounds to offer you for the problem.
> 
> Thanks,
> Sean
> 
> -----Original Message-----
> From: Kurt Strosahl [mailto:strosahl at jlab.org] 
> Sent: 10 July 2015 16:01
> To: Sean Brisbane
> Cc: Patrick Farrell; lustre-discuss at lists.lustre.org
> Subject: Re: [lustre-discuss] lustre 2.5.3 ost not draining
> 
> The problem there is that I cannot afford to leave it "some number of days"... it is at 97% full, so new writes are going to it faster then it can clean itself off.
> 
> w/r,
> Kurt
> 
> ----- Original Message -----
> From: "Sean Brisbane" <sean.brisbane at physics.ox.ac.uk>
> To: "Patrick Farrell" <paf at cray.com>, "Kurt Strosahl" <strosahl at jlab.org>
> Cc: lustre-discuss at lists.lustre.org
> Sent: Friday, July 10, 2015 10:44:39 AM
> Subject: RE: [lustre-discuss] lustre 2.5.3 ost not draining
> 
> Hi,
> 
> The 'space not freed' issue also happened to me and I left it 'some number of days'  I don't recall how many, it was a while back.
> 
> Cheers,
> Sean
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