Re: [MooseFS-Users] Slow replication between internal disks of 1 chunkserver

[Aleksander W. <ale...@mo...>]

Hello.

Starting from version MooseFS 2.0.x there's a new mechanism for internal
replication within chunkserver that can be controlled using
HDD_REBALANCE_UTILIZATION parameter in mfschunkserver.cfg file.
 
So you have two options:
1. You can set it to minimal value of 1, to decrease the impact of
internal rebalancing on i/o performance of the chunkserver.
HDD_REBALANCE_UTILIZATION = 1

2. You can set it to higher number during off-peak hours so the
rebalancing between chunkservers disks will finish faster in some
maintenance window.

Best regards
Aleksander Wieliczko
Technical Support Engineer
MooseFS.com <moosefs.com>


On 04/03/2015 09:45 AM, Davies Liu wrote:
> You can have a script to copy some files into new disk and create a
> symlink for copied files.
>
> Once the disks got balanced, you can stop the chunk server, REMOVE all
> symlinks, then start chunk server.
>
> On Thu, Apr 2, 2015 at 11:30 PM, Neddy, NH. Nam <na...@nd...> wrote:
>> Hi,
>>
>> One disk was added to a chunkserver (2.0.60 CE) recently, but the
>> performance seems to be not good compared to adding totally new
>> chunkserver.
>>
>> All the disks are the same capacity but different brands. The
>> previously new added chunkserver has performed at limit write speed of
>> SATA2 (avg 60 MB/s), but the current server with brand disk added that
>> only has been wrting avg. 25 MB/s. (as seen in server graphs)
>>
>> Does anybody have idea on this?
>> Thanks,
>> ~Neddy
>>
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