Setting a target's pool manually

[Thomas Röblitz]

Hello beegfs Support,

  is it possible to set the pool (normal, low, emergency) of a target manually?

Thanks in advance

Thomas

[Ely de Oliveira]

Hello Thomas,

You have to change the properties bellow on the configuration file /etc/beegfs/beegfs-mgmtd.conf and then, restart the management service. The other BeeGFS services may stall for a few seconds if they try to communicate with the management service when it is still not ready, but they will resume communication as soon as the beegfs-mgmtd daemon is back.

tuneMetaInodesLowLimit
tuneMetaInodesEmergencyLimit
tuneMetaSpaceLowLimit
tuneMetaSpaceEmergencyLimit
tuneStorageDynamicPools
tuneStorageInodesLowLimit
tuneStorageInodesEmergencyLimit
tuneStorageSpaceLowLimit
tuneStorageSpaceEmergencyLimit


Best regards,

Ely

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[Toby Darling]

Hi Thomas

> is it possible to set the pool (normal, low, emergency) of a target
> manually?

Mentioned in http://www.beegfs.com/release/fhgfs_2012.10/Changelog.txt:

"storage/meta: New method to manually override reported amount of free
disk space through a "free_space.override" file in a target directory.
This can be used e.g. to report 0 disk space left for a certain target,
so that it gets moved to the emergency pool and thus won't be used for
new files:
$ echo 0 > <storeStorageDirectory>/free_space.override
(No daemon restart is required when the file is created or removed.)"

A quick look at the source indicates this is still valid in 2015.03-r13

Cheers
Toby
--
Toby Darling, Scientific Computing (2N249)
MRC Laboratory of Molecular Biology
Francis Crick Avenue
Cambridge Biomedical Campus
Cambridge CB2 0QH
Phone 01223 267070