On Mon, 15 Jul 2013 22:34:15 +0200 Rave it <chat-to-me@xxxxxxxxx> wrote: > > Hmm, > for me me this is more a question how can i configure > bcache or dm-cache in a system which use more than one SSD > and some conventional hard-disk. Seems like only you or > some kernel devs know about how to do this. Can you give a > configuration example for f19? For example, i use 4 SSD at > a hardware-raid for my several systems > (f17/f18/f19/rawhide), i called it A, i need this for > testing compiz on baremetal for all current fedora > releases. On a second hardware-raid- controller i have 4 > conventional disks to store my data, i called it B. So, if > i add another SSD for bcache or dm-cache, i called C, how > can i configure it? 1. this configuration should not > control disk A 2. disk C should use as cache for disk B > > Is this possible to configure? > Do you have a link with more info's and configuration > examples. > > best regards, > Wolfgang First off -- bcache requires an additional superblock on the backing disk / block device -- in this case, B. So you would have to reformat the entire B array if you wanted to use bcache on it. With that in mind, see: http://evilpiepirate.org/git/linux-bcache.git/tree/Documentation/bcache.txt?h=bcache-dev#n38 """ make-bcache -B /dev/path/to/B -C /dev/new/SSD ... The devices show up as: /dev/bcache<N> As well as (with udev): /dev/bcache/by-uuid/<uuid> /dev/bcache/by-label/<label> To get started: mkfs.ext4 /dev/bcache0 mount /dev/bcache0 /mnt """ That document should help answer some of your questions about bcache. Best regards, Conrad -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
