[gpfsug-discuss] mass recall from on-prem COS using a policy

Amey P Gokhale amey.gokhale at in.ibm.com
Wed Jul 20 07:54:35 BST 2022


Paul – Recall policy looks to be correct. I see that it is in line with /opt/ibm/MCStore/samples/recallFromCloud.template.

  1.  At the end of policy run, what does the stats indicate, such as “X Files migrated, Y skipped/error” etc?  I assume the path you have specified, has the files in ‘non-resident’ state, which you are trying to recall using the policy. Correct? Reason I ask this is because you mentioned around 650G data to be recalled, but policy seems to have chosen ~2.5G data across 4812 files. So if this path is actively used by users, it is likely that the files may have been transparently recalled on access, and are in co-resident state already. Hence no data movement visible.
  2.  In /var/MCStore/ras/logs/mcstore.log, do you see any recall specific errors, when you run the policy?
  3.  On our test setup, we are planning to run similar policy once, to see if error is reproducible. I will share what we find.

AMEY GOKHALE
Senior Software Engineer – Spectrum Scale
Phone: 91-988 100 8675
E-mail: amey.gokhale at in.ibm.com<mailto:amey.gokhale at in.ibm.com>

From: Huzefa H Pancha <hupancha at in.ibm.com> On Behalf Of scale at us.ibm.com
Sent: 19 July 2022 23:42
To: gpfsug main discussion list <gpfsug-discuss at gpfsug.org>; Amey P Gokhale <amey.gokhale at in.ibm.com>
Cc: gpfsug-discuss <gpfsug-discuss-bounces at gpfsug.org>
Subject: Re: [EXTERNAL] Re: [gpfsug-discuss] mass recall from on-prem COS using a policy


Hi Amey,

Can you provide them guidance from TCT angle.

Regards, The Spectrum Scale (GPFS) team

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[Inactive hide details for "Paul Ward" ---19-07-2022 09.34.33 PM---Thank you. Ill-placed on ESS or COS?]"Paul Ward" ---19-07-2022 09.34.33 PM---Thank you. Ill-placed on ESS or COS?

From: "Paul Ward" <p.ward at nhm.ac.uk<mailto:p.ward at nhm.ac.uk>>
To: "gpfsug main discussion list" <gpfsug-discuss at gpfsug.org<mailto:gpfsug-discuss at gpfsug.org>>
Date: 19-07-2022 09.34 PM
Subject: [EXTERNAL] Re: [gpfsug-discuss] mass recall from on-prem COS using a policy
Sent by: "gpfsug-discuss" <gpfsug-discuss-bounces at gpfsug.org<mailto:gpfsug-discuss-bounces at gpfsug.org>>

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Thank you. Ill-placed on ESS or COS? I understood restriping was for NSDs, so that would be on our ESS not COS? The direction I want to move the files is from COS to ESS. We do not have AFM enabled, we are using TCT. ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍
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Thank you.

Ill-placed on ESS or COS?

I understood restriping was for NSDs, so that would be on our ESS not COS?
The direction I want to move the files is from COS to ESS.

We do not have AFM enabled, we are using TCT.

From: gpfsug-discuss <gpfsug-discuss-bounces at gpfsug.org<mailto:gpfsug-discuss-bounces at gpfsug.org>> On Behalf Of IBM Spectrum Scale
Sent: 18 July 2022 20:35
To: gpfsug main discussion list <gpfsug-discuss at gpfsug.org<mailto:gpfsug-discuss at gpfsug.org>>; Venkateswara R Puvvada <vpuvvada at in.ibm.com<mailto:vpuvvada at in.ibm.com>>
Subject: Re: [gpfsug-discuss] mass recall from on-prem COS using a policy


 "KB_Ill" shows how much data are ill placed or ill replicated.  They can be resolved by mmrestripefs or mmrestripefile.
Copying to AFM team regarding recall in AFM-COS environment.

Regards, The Spectrum Scale (GPFS) team

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If your query concerns a potential software error in Spectrum Scale (GPFS) and you have an IBM software maintenance contract please contact  1-800-237-5511 in the United States or your local IBM Service Center in other countries.

[Inactive hide details for "Paul Ward" ---07/12/2022 11:40:52 AM---Hi all, I need to recall from on-prem COS a folder with subfo]"Paul Ward" ---07/12/2022 11:40:52 AM---Hi all, I need to recall from on-prem COS a folder with subfolders and files, approximately 4600 fil

From: "Paul Ward" <p.ward at nhm.ac.uk<mailto:p.ward at nhm.ac.uk>>
To: "gpfsug-discuss at gpfsug.org<mailto:gpfsug-discuss at gpfsug.org>" <gpfsug-discuss at gpfsug.org<mailto:gpfsug-discuss at gpfsug.org>>
Date: 07/12/2022 11:40 AM
Subject: [EXTERNAL] [gpfsug-discuss] mass recall from on-prem COS using a policy
Sent by: "gpfsug-discuss" <gpfsug-discuss-bounces at gpfsug.org<mailto:gpfsug-discuss-bounces at gpfsug.org>>

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Hi all, I need to recall from on-prem COS a folder with subfolders and files, approximately 4600 files making up 656G. We have a policy that runs every 30 mins, and I added this line to it: ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍
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Hi all,

I need to recall from on-prem COS a folder with subfolders and files, approximately 4600 files making up 656G.
We have a policy that runs every 30 mins, and I added this line to it:

RULE 'migrate_iac-workspace_Chem-labs' MIGRATE FROM POOl 'migrate' TO POOL 'data' WHERE PATH_NAME LIKE '/gpfs/nhmfsa/bulk/share/workspace/iac-workspace/Chem_Labs/%'

Migrate is an external pool
RULE EXTERNAL POOL 'migrate' EXEC '/usr/lpp/mmfs/bin/mmcloudgateway files' OPTS '-F' ESCAPE '% -'

And data is the default placement pool
RULE 'Placement' SET POOL 'data'

When it runs it identifies matching files:
Rule#     Hit_Cnt               KB_Hit                 Chosen                KB_Chosen         KB_Ill    Rule
13          4846                     2491152              4846                     2491152              7056      RULE      'migrate_iac-workspace_Chem-labs'       MIGRATE  FROM      POOL  'migrate'  TO  POOL  'data'     WHERE(.)

I can’t find what ‘KB_ Ill’ means but nothing is migrating.

Migrations in other policies work, but this is a ‘recall’ policy.
>From this document https://www.ibm.com/docs/en/spectrum-scale/5.1.3?topic=pools-migrate-recall-external<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ibm.com%2Fdocs%2Fen%2Fspectrum-scale%2F5.1.3%3Ftopic%3Dpools-migrate-recall-external&data=05%7C01%7Cp.ward%40nhm.ac.uk%7Ca34ce171bfa64681616808da68f543f1%7C73a29c014e78437fa0d4c8553e1960c1%7C1%7C0%7C637937700273967446%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000%7C%7C%7C&sdata=WmkkYdeQwjIZwqSS3UjEJwBwrmmzA0XP6o8QhQ1JQOM%3D&reserved=0>
It suggests it should be invoked as a recall.

Any ideas?

Kindest regards,
Paul

Paul Ward
TS Infrastructure Architect
Natural History Museum
T: 02079426450
E: p.ward at nhm.ac.uk<mailto:p.ward at nhm.ac.uk>
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