On Tue, Jul 03, 2007 at 05:31:00PM +0200, Heinz Mauelshagen wrote: > On Mon, Jul 02, 2007 at 04:51:24PM -0700, Fang, Ying wrote: > > > > > >The data structure already exist: raid_set and raid_dev. > > >For one-level sets, a raid_set structure with multiple raid_dev > > >structures hanging off. > > >For 2-level sets (eg. RAID10), a top-level raid_set structure, multiple > > >bottom level raid_set structures hanging off it and multiple raid_dev > > >structures hanging off the bottom level ones. > > > > > >You got to check, if the properties (ie. the structure mebers) are > > >sufficient or if we need to add some. > > > > > >> Then it calls .create of an > > >> appropriate handler to build and write metadata to each hard device > > of > > >> the raid set. > > > > > >It calls a) .create and of that succeeds it'll call b) .write > > >in a followup step. > > > > You mean the metadata creation procedure is the reverse path of building > > a raidset from metadata: > > 1. create a raid set (struct raid_set) and its subsets > > 2. create a list of raid devices for all subsets > > Yes, a list of raid devices for each lowest level subset. > > > 3. call .create for each raid device to generate a complete metadata > > attached to the device (struct raid_dev) > > Right, that's where we got to think about needing any additional > members in structs raid_set and raid_dev in case we can't store > enough RAID set or RAID device properties. > > > 4. call .write to write metadata to each hard drive. > > Correct. > > > > > > > >> > > >> How about manual and auto rebuilding? Should updating metadata status > > be > > >> handled by DMRAID or device drivers? > > > > > >By dmraid using dmeventd, which is part of libdevmapper. > > >You got to create a dmraid DSO for dmeventd to make that happen. > > >Look at the mirror DSO for dmeventd for an example. > > > > > > > Is it to call dm_event_handler_create, and dm_event_registered_device to > > create a dmraid DSO? I didn't find the mirror DSO. Could you give me the > > name of the file? > > It is part of liblvm2: > lib/mirror/mirror.c s/mirror.c/mirrored.c/ :) > > Heinz > > > > > Thanks, > > Ying _______________________________________________ Ataraid-list mailing list Ataraid-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ataraid-list
