Thank you! Arno On Thu, Mar 27, 2014 at 18:56:06 CET, Stephen Cousins wrote: > I'm following up on this to let you know that it has been identified as a > ZFS sync issue that has been addressed recently. No need to contact > dm-devel. > > Thanks for your help. > > Steve > > > On Thu, Mar 20, 2014 at 6:12 PM, Stephen Cousins <steve.cousins@xxxxxxxxx>wrote: > > > I'm getting mixed results but it is looking like ZFS have something to do > > with the problem afterall. > > > > I tried it with dm-crypt -> XFS -> NFS and I'm not seeing the same lag > > issue. I say mixed results mainly because I've been using rsync to do the > > testing and for some reason rsync has trouble with this setup. It works but > > really slowly. Like around 3 MB/sec over a Gigabit link. If I use "cp -pR" > > then it goes at 60 MB/sec. I use rsync all the time and I've never seen > > this before so it took a while for me to realize that rsync was acting up. > > Anyone run into this before? > > > > I'll bring this to the ZFSonLinux people and see what they say. > > > > Thanks, > > > > Steve > > > > > > On Thu, Mar 20, 2014 at 3:16 PM, Milan Broz <gmazyland@xxxxxxxxx> wrote: > > > >> On 03/20/2014 03:48 PM, Stephen Cousins wrote: > >> > I am testing dm-crypt with a system that serves data over NFS. I'm > >> > finding that when serving the data over NFS4 it will go for a little > >> > while and then it will just stop copying and networking on the NFS > >> > server will stall out so that other connections to other parts of the > >> > storage (a non-dm-crypt volume) will become very laggy. Soon after > >> > canceling the copy the other connections resume back to normal. > >> > > >> > I have tried this on two different servers, one with a single disk > >> > with ZFS and another with a ZFS raidz2 pool and they both do the same > >> > thing. CPU doesn't seem to be an issue. Doing local copies is not a > >> > problem. That is, copying to/from these volumes made up of dm-crypted > >> > disks from other disks on the server have no problems. > >> > > >> > One system (the one with the RAID pool) is CentOS 6.4 and the other > >> > one is CentOS 6.5. > >> > > >> > I'm curious if anyone else has run into this before and if so, what > >> > can be done to make it work? I'm going to test to see if taking ZFS > >> > out of the equation helps. I haven't run into this with ZFS with > >> > disks without dm-crypt. > >> > >> Hi, > >> > >> unfortunately the dmcrypt code in Centos 6.x is not what is upstream > >> kernel (mainly because of per cpu processing changes upstream). > >> (It would be interesting if it is reproducible with upstream kernel, > >> but I guess it is not easy to test...) > >> > >> I am adding cc to dm-devel list, maybe someone there could have some idea > >> how to help here. > >> > >> Milan > >> > >> > > >> > Thanks, > >> > > >> > Steve > >> > > >> > > >> > > >> > -- ________________________________________________________________ > >> > Steve Cousins Supercomputer Engineer/Administrator > >> > Advanced Computing Group University of Maine System 244 > >> > Neville Hall (UMS Data Center) (207) 561-3574 > >> > <tel:%28207%29%20561-3574> Orono ME 04469 > >> > steve.cousins at maine.edu <http://maine.edu> > >> > > > > > > > > -- > > ________________________________________________________________ > > Steve Cousins Supercomputer Engineer/Administrator > > Advanced Computing Group University of Maine System > > 244 Neville Hall (UMS Data Center) (207) 561-3574 > > Orono ME 04469 steve.cousins at maine.edu > > > > > > > -- > ________________________________________________________________ > Steve Cousins Supercomputer Engineer/Administrator > Advanced Computing Group University of Maine System > 244 Neville Hall (UMS Data Center) (207) 561-3574 > Orono ME 04469 steve.cousins at maine.edu > _______________________________________________ > dm-crypt mailing list > dm-crypt@xxxxxxxx > http://www.saout.de/mailman/listinfo/dm-crypt -- Arno Wagner, Dr. sc. techn., Dipl. Inform., Email: arno@xxxxxxxxxxx GnuPG: ID: CB5D9718 FP: 12D6 C03B 1B30 33BB 13CF B774 E35C 5FA1 CB5D 9718 ---- A good decision is based on knowledge and not on numbers. - Plato _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
