Thought following may be relevent to mention here, which I got from splunk wiki. You can have global settings before each index and then define individually for each index.
# global settings
# Inheritable by all indexes: no hot/warm bucket can exceed 1 TB.
# Individual indexes can override this setting.
homePath.maxDataSizeMB = 1000000
# volumes
[volume:caliente]
path = /mnt/fast_disk
maxVolumeDataSizeMB = 100000
[volume:frio]
path = /mnt/big_disk
maxVolumeDataSizeMB = 1000000
# indexes
[i1]
homePath = volume:caliente/i1
# homePath.maxDataSizeMB is inherited from the global setting
coldPath = volume:frio/i1
# coldPath.maxDataSizeMB not specified anywhere:
# This results in no size limit - old-style behavior
Also read this article
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