Re: [Moosefs-users] How to speedup replication from disk marked for removal

[Davies L. <dav...@gm...>]

On Fri, May 18, 2012 at 10:35 PM, Boris Epstein <bor...@gm...> wrote:
>
>
> On Fri, May 18, 2012 at 10:31 AM, Davies Liu <dav...@gm...> wrote:
>>
>> On Fri, May 18, 2012 at 9:36 PM, Boris Epstein <bor...@gm...>
>> wrote:
>> > Davies,
>> >
>> > How would you do that? Do you just copy the whole chunk storage
>> > directory?
>>
>> Yes，it do not matter which disk the chunk data was stored.
>>
>> If one disk has less free space, we could even move part of them to
>> another.
>>
>> After a patch for chunk server, make a symlink for moved chunks, we could
>> do this disk usage adjustment online, without shutting down chunk server.
>> mfsrebalance.py, as attached, can do this automatically.
>>
>
> But I think the task is to take the entire chunk server off line - then do
> you just move the content? Then how does the system know where to look for
> it?

No，you do not need to shut down chunk server, after moving a chunk file,
mfsrebalance.py will create a symlink for original path.

If you just copy chunk data, you do not need shut down chunk server too.
After restarting, the chunk server will now the new path for moved chunks.

> Boris.
>
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-- 
 - Davies