Re: [Moosefs-users] corner case in disk for removal algorithm ?

[Michal B. <mic...@ge...>]

Hi Laurent!

Yes, we know about this (If I recall, we already talked something about this
subject on our group before). Generally speaking there is no mechanism
leveling out the occupation of the disks within a single chunkserver (to
implement in the future), there is only a mechanism leveling out the
occupation between the chunkservers.

When you remove the 400 GiB disks, the system will eventually rebalance
everything after some time.


Best regards
-Michal

-----Original Message-----
From: Laurent Wandrebeck [mailto:lw...@hy...] 
Sent: Wednesday, May 25, 2011 1:14 PM
To: moo...@li...
Subject: [Moosefs-users] corner case in disk for removal algorithm ?

Hi there,

I've got a chunkserver, say A, with 24 disks (JBOD).
12 have already been changed from 400 GiB to 2TiB. Load is finished.
Now, I marked for removal the 12 400 GiB that were remaining. The other
chunkservers are taking the chunks, but the 12 2 TiB disks on A are not at
all taking the load. So A, considering only the 12 2TiB disks, is 90% full,
while the other chunkservers are now at 96%.
Could it be a forgotten corner case in chunks space load balance ?

Thanks,
--
Laurent Wandrebeck
HYGEOS, Earth Observation Department / Observation de la Terre
Euratechnologies
165 Avenue de Bretagne
59000 Lille, France
tel: +33 3 20 08 24 98
http://www.hygeos.com
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