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As per the thin provisioning docs for creating the pool: $data_block_size gives the smallest unit of disk space that can be allocated at a time expressed in units of 512-byte sectors. $data_block_size must be between 128 (64KB) and 2097152 (1GB) and a multiple of 128 (64KB). $data_block_size cannot be changed after the thin-pool is created. People primarily interested in thin provisioning may want to use a value such as 1024 (512KB). People doing lots of snapshotting may want a smaller value such as 128 (64KB). The switch from 512 (which we used before) to 128 (recommended above for lots of snapshoting) means a simple container creation (based on the mattdm/fedora:f19 image) adds 1 MB of diskspace rather than 3.6. This seems more in tune with how docker is typically used. |
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docker-device-tool | ||
deviceset_devmapper.go | ||
devmapper.go | ||
devmapper_log.go |