On Thu, Aug 16, 2012 at 3:32 PM, Sage Weil <sage@xxxxxxxxxxx> wrote: > As for the new options, I suggest: > > * osd fs type > * osd fs devs (will work for mkcephfs, not for new stuff) > * osd fs path > * osd fs options What does osd_fs_path mean, and how is it different from the osd_data dir? I'm expecting to need both mkfs-time options (btrfs metadata block size etc) and mount-time options (noatime etc). It would be nice if there was a way to set the options for all fstypes, and then just toggle which one is used (by default). That avoids bugs like trying to mkfs/mount btrfs with xfs-specific options, and vice versa. I'm not sure how well our config system will handle dynamic variable names -- ceph-authtool was fine with me just putting data in osd_crush_location, and we don't need to access these variables from C++, so it should be fine. If you really wanted to, you could probably cram the them into a single variable, with ad hoc structured data in the string value, but that's ugly.. Or just hardcode the list of possible filesystems, and then it's not dynamic variable names anymore. So I'm dreaming of something like: [osd] # what mount options will be passed when an osd data disk is using # one of these filesystems; these are passed to mount -o osd mount options btrfs = herp,foo=bar osd mount options xfs = noatime,derp # what mkfs options are used when creating new osd data disk # filesystems osd mkfs options btrfs = --hur osd mkfs options xfs = --dur # what fstype to use by default when mkfs'ing; mounting will detect # what's there (with blkid) and work with anything osd mkfs type = btrfs # this may go away with "mkcephfs 2.0", and it will have to get more # complex if we provide something for journals too, etc, because you # may want to pair specific data disks to specific journals (DH has # this need).. haven't had time to think it through, which is why i'm # leaning toward "and here's a hook where you run something on the # host that calls ceph-disk-prepare etc on all the disks you want", # and using uuids to match journals to data disks -- this work has # not yet started) osd fs devs = /dev/sdb /dev/sdc -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
