[lustre-discuss] Lustre 2.11 File Level Replication

Patrick Farrell paf at cray.com
Fri Jun 22 12:54:26 PDT 2018


I’m adding the list back on here, because that *seems* like it’s wrong.  Don’t have time to check right now, but I’m curious if others can weigh in.

  *   Patrick

From: Mark Roper <markroper at gmail.com>
Date: Friday, June 22, 2018 at 2:29 PM
To: Patrick Farrell <paf at cray.com>
Subject: Re: [lustre-discuss] Lustre 2.11 File Level Replication

Thanks Patrick!  It looks like you can't set default mirroring with setstripe.  I appreciate the lead and the response!

On Thu, Jun 21, 2018 at 10:09 AM Patrick Farrell <paf at cray.com<mailto:paf at cray.com>> wrote:


I haven’t played specifically with FLR and inheritance/templates, but if you want to set a default layout on a directory, you’ll want to look at lfs setstripe.  Mirror extend is specifically for modifying individual, existing files.

- Patrick
From: lustre-discuss <lustre-discuss-bounces at lists.lustre.org<mailto:lustre-discuss-bounces at lists.lustre.org>> on behalf of Mark Roper <markroper at gmail.com<mailto:markroper at gmail.com>>
Sent: Thursday, June 21, 2018 8:36:43 AM
To: lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org>
Subject: [lustre-discuss] Lustre 2.11 File Level Replication

Hi Lustre Users,

I have set up a Lustre 2.11 cluster with multiple OSS's in order to experiment with the File Level Replication feature in Lustre 2.11, which I'm excited about since it raises the bar on availability for cloud deployment of Lustre. I cannot seem to get files created within a directory to inherit the mirror settings from the parent directory, which I thought might be possible given the documentation at http://wiki.lustre.org/File_Level_Replication_High_Level_Design :

'lfs mirror extend [--no-verify] <-N[mirror_count]> [other setstripe options|-f <victim_file>] <file_name>
This command will append a replica indicated by setstripe options or just take the layout from existing file victim_file into the file file_name. The file_name must be an existing file but it can be a mirrored or normal file. This command will create new volatile file with any optional setstripe options that are specified, or using the defaults inherited from the parent directory or filesystem.'

I was hoping to be able to make all files written to particular directories or within a filesystem inherit a mirror count transparently to the client writing or reading files.  Does anyone know if this is possible?


Mark Roper
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