[lustre-discuss] Lustre 2.11 File Level Replication

Mark Roper markroper at gmail.com
Thu Jun 21 06:36:43 PDT 2018

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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