Dne 21.10.2014 v 03:36 lilofile napsal(a):
In dm-thin.c, /* * The block size of the device holding pool data must be * between 64KB and 1GB. */ #define DATA_DEV_BLOCK_SIZE_MIN_SECTORS (64 * 1024 >> SECTOR_SHIFT) #define DATA_DEV_BLOCK_SIZE_MAX_SECTORS (1024 * 1024 * 1024 >> SECTOR_SHIFT) why the block size must be between 64KB and 1GB, can I change the value of DATA_DEV_BLOCK_SIZE_MIN_SECTORS? what effect if the value of DATA_DEV_BLOCK_SIZE_MIN_SECTORS<128?
Performance reasons mainly - updating metadata much more frequently is lowering the throughput considerable.
The other issue is you would also scale up required metadata size. Zdenek -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
