[LU-3258] Command Line Tools

• Status: Resolved
• Project: Lustre
• Affects Version/s: Lustre 2.5.0
• Type: Technical task
• Priority: Minor
• Reporter: Jinshan Xiong (Inactive)
• Assignee: Jinshan Xiong (Inactive)
• Resolution: Duplicate

Description

the following command line tools will be provided:
1. lfs raid1_merge
2. lfs raid1_split
3. lfs raid1_resync

Creating replication files directly won't be supported in this phase, because write to replication is not supported, it will be impossible to get a non-zero sized replication file.

Comments

[Andreas Dilger]

This task should also include the functionality to make a replica copy of an existing file. I don't want the user tools to only do split/merge of a replicated file, but the user is required to write their own script to make a copy of the file.

[Jinshan Xiong (Inactive)]

indeed. Things are a little easier than before since we have exclusive open. So let's define a command as:

lfs raid1_make_it_raid1 [options like lfs setstripe] <existing_file>

to turn an existing file into a raid1 file, or add one more copy to a raid1 file. In this command, the following steps will be performed:
1. create a temp file with speicified stripe pattern or default policy;
2. open the existing file exclusively;
3. copy the file content to the temp file;
4. lfs raid1_merge

However, this implementation of raid1_make_it_raid1 should have lower priority. The most important thing is still to finish the IO infrastructure.

[Andreas Dilger]

Implemented as part of LU-9771.