On Thu, Dec 17 2015 at 2:11pm -0500, Mahmoud Hanafi <mahmoud.hanafi@xxxxxxxx> wrote: > We are experimenting with dm-cache and would like to be able to > promote a range of block and pin them in the cache device. > > Are there any tool that can be used for this? There isn't an interface to do that right now. But it _should_ be possible to add a DM message to easily promote an origin block range. Pinning isn't something we really do at this point so that'd require more work. But it could look something like this: dmsetup message <cache_dev> 0 promote_oblocks <start> <end> dmsetup message <cache_dev> 0 pin_oblocks <start> <end> and: dmsetup message <cache_dev> 0 demote_oblocks <start> <end> dmsetup message <cache_dev> 0 unpin_oblocks <start> <end> (where <start> and <end> are in either cache_block_size units or 512b sectors... not sure which would be best, sectors is a bit more approachable) I could see this getting a bit cumbersome, not to mention the smq cache policy really _should_ promote if it makes sense to cache a block, but we'll certainly need Joe's thoughts on this. Mike -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
