Hi, In reference to dm-cache: can the same cache and metadata devices be used with multiple origin devices? This can be configured, and we've done some tests that appear to show that it works - we're looking for confirmation (or otherwise). Here's an example test setup to clarify -- ssd_metadata and ssd_blocks are being used to cache sdc and sdd. In testing, different patterns were written to areas of sdc_cached and sdd_cached; afterwards, the contents of sdc and sdd were as expected. dmsetup create sdc_cached --table '0 4194304 cache /dev/mapper/ssd_metadata /dev/mapper/ssd_blocks /dev/sdc 512 1 writethrough default 0' dmsetup create sdd_cached --table '0 4194304 cache /dev/mapper/ssd_metadata /dev/mapper/ssd_blocks /dev/sdd 512 1 writethrough default 0' Our thinking is that using one large cache for multiple origin devices will result in a more efficient use of flash resources than statically partitioning the flash amongst the origins. Also, there's no need to repartition or buy another SSD to start caching a newly-added origin. Thanks, Morgan Mears -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
