I can reproduce Andy's multipathd behaviour with scsi_debug (symmetrix arrays too)... only with the upstream directio checker. My guess is that the async code in there misbehaves. Needs review. ----- Mail Original ----- De: "Andy" <genanr@xxxxxxxxxxxx> À: "device-mapper development" <dm-devel@xxxxxxxxxx> Envoyé: Jeudi 2 Avril 2009 23h50:08 GMT +01:00 Amsterdam / Berlin / Berne / Rome / Stockholm / Vienne Objet: Re: Device Mapper MultiPath On Thu, Apr 02, 2009 at 03:32:33PM -0400, Konrad Rzeszutek wrote: > On Thu, Apr 02, 2009 at 02:09:56PM -0500, Andy wrote: > > On Wed, Apr 01, 2009 at 04:31:08PM -0400, Konrad Rzeszutek wrote: > > > On Wed, Apr 01, 2009 at 03:08:41PM -0500, Andy wrote: > > > > On Tue, Mar 31, 2009 at 08:25:59PM -0400, Konrad Rzeszutek wrote: > > > > > On Tue, Mar 31, 2009 at 09:07:08PM -0300, Rodrigo Nascimento wrote: > > > > > > Hi All, > > > > > > > > > > > > I'm a student of computer sciences and I'd like to collaborate with the > > > > > > development of the DM-MP. > > > > > > I know that maybe you received this kind of message during all time, but I > > > > > > > > > > I think you are the first :-) > > > > > > > > > > > really want to help, with anything. > > > > > > > > > > Shakedown help would be nice. As in, trying to yank stuff underneath it, > > > > > add new block disks, remove them, add them, remove them, edit the > > > > > multipath.conf file and issue 'reconfigure', resize the maps, > > > > > then add 1000+LUNs, and while they are being added, start removing the > > > > > LUNs, then for extra fun call 'dmsetup remove_all' while in another > > > > > thread you run 'multipath'. Ooh, and see if there are any memory leaks > > > > > while this all is being done. > > > > > > > > > > > > > What I would really like to see is online resizing of non-partitioned dm > > > > block devices. I would love to be able to resize an underlying dm-mp block > > > > device, and the just grow the filesystem without using a extra, un-needed, > > > > > > Benjamin posted a CVS patch of this, that I've forward-ported to work with > > > the latest git. It is attached. > > > > > > > > > > Thanks, I must have missed that post. Unfortantly, I am having problems with > > multipathd in the latest git. It fails all my paths and hangs. It I go > > Ugh. That doesn't bode well. Try running it with 'strace' to see if it is hanging > on the ioctl or what not. > The multipathd process is just sitting there polling, but I don't think it gets to a point where it can handle requests from an interactive version of itself. I do see detecting or failing the paths in the log: Apr 02 16:24:01 | sdc: ownership set to test1_vm1 Apr 02 16:24:01 | sdc: not found in pathvec Apr 02 16:24:01 | sdc: mask = 0xc Apr 02 16:24:01 | sdc: path checker = directio (controller setting) Apr 02 16:24:01 | sdc: state = running Apr 02 16:24:01 | directio: starting new request Apr 02 16:24:01 | directio: async io getevents returns -14 (errno=No such file or directory) Apr 02 16:24:01 | directio: abort check on timeout Apr 02 16:24:01 | sdc: state = 2 Apr 02 16:24:01 | sdc: checker msg is "directio checker reports path is down" Apr 02 16:24:01 | sde: ownership set to test1_vm1 Apr 02 16:24:01 | sde: not found in pathvec Apr 02 16:24:01 | sde: mask = 0xc Apr 02 16:24:01 | sde: path checker = directio (controller setting) Apr 02 16:24:01 | sde: state = running Apr 02 16:24:01 | directio: starting new request Apr 02 16:24:01 | directio: async io getevents returns -14 (errno=No such file or directory) Apr 02 16:24:01 | directio: abort check on timeout Apr 02 16:24:01 | sde: state = 2 Apr 02 16:24:01 | sde: checker msg is "directio checker reports path is down" Apr 02 16:24:01 | test1_vm1: pgfailover = -1 (internal default) Apr 02 16:24:01 | test1_vm1: pgpolicy = multibus (LUN setting) Apr 02 16:24:01 | test1_vm1: selector = round-robin 0 (LUN setting) Apr 02 16:24:01 | test1_vm1: features = 0 (controller setting) Apr 02 16:24:01 | test1_vm1: hwhandler = 0 (controller setting) Apr 02 16:24:01 | test1_vm1: rr_weight = 1 (controller setting) Apr 02 16:24:01 | test1_vm1: minio = 1 (LUN setting) Apr 02 16:24:01 | test1_vm1: no_path_retry = NONE (internal default) Apr 02 16:24:01 | pg_timeout = NONE (internal default) Apr 02 16:24:01 | test1_vm1: set ACT_NOTHING (no usable path) Apr 02 16:24:01 | sdb: ownership set to u01_vm1 Apr 02 16:24:01 | sdb: not found in pathvec Apr 02 16:24:01 | sdb: mask = 0xc Apr 02 16:24:01 | sdb: path checker = directio (controller setting) Apr 02 16:24:01 | sdb: state = running Apr 02 16:24:01 | directio: starting new request Apr 02 16:24:01 | directio: async io getevents returns -14 (errno=No such file or directory) Apr 02 16:24:01 | directio: abort check on timeout Apr 02 16:24:01 | sdb: state = 2 Apr 02 16:24:01 | sdb: checker Other than that, I did not see anything significant in the strace or the debugging messages. Andy -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
