Hi, sorry, my previous answer was off the mark... When 2 nodes reach there at the same time, node A notices that the other node want to lock too, so give up lock itself. node B is ready to lock.
Thanks, Junko > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Junko IKEDA > Sent: Thursday, August 09, 2007 4:30 PM > To: 'High-Availability Linux Development List' > Subject: RE: [Linux-ha-dev] Shared disk file Exclusiveness control > programforHB2 > > Hi, > > You know that could be true... > but if it's called from RA, 2 nodes wouldn't reach that part at the same > time, right? > One node will be able to reach there according to the score rule. > > Thanks, > Junko > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf Of Xinwei Hu > > Sent: Thursday, August 09, 2007 3:00 PM > > To: High-Availability Linux Development List > > Subject: Re: [Linux-ha-dev] Shared disk file Exclusiveness control program > > forHB2 > > > > Hi, > > > > There's races in the sfex_lock.c. > > > > When 2 nodes reach sfex_lock.c:265 in the same time. > > > > node A: reserve lock -> wait for collision_timeout -> hold lock > > node B: sleep -> sleep -> reserve > > lock > > > > 在 星期三 08 八月 2007 12:00，NAKAHIRA Kazutomo 写道： > > > Hello, all. > > > > > > We wrote a Shared Disk File EXclusiveness Control Program, called > > > "SF-EX" for short, could prevent a destruction of data on > > > shared disk file system due to Split-Brain. > > > > > > This program consists of CUI commands written in the C and RA, > > > the former is used for managing and monitoring shared disk status > > > and the latter is the same as other common RAs. > > > > > > We tested this program on IBM and HP platform, and we confirmed > > > all functions worked well. > > > > > > Our test environment is listed below: > > > Software: > > > OS :RHEL4 ES Update5(kernel2.6.9-55.ELsmp) > > > HB2:heartbeat-2.1.2-2 > > > > > > Hardware: > > > IBM platform: > > > Server : System x3650 > > > Shared disk: DS 4700 (FC) > > > > > > HP platform: > > > Server : DL380G5 > > > Shared disk: MSA500G2 (SCSI) > > > > > > How to install and configuration are described in README. > > > If you are interested in this program, please try it and > > > let me know your comments. > > > > > > Your suggestions on how to improve are really appreciated. > > > > > > Best regards. > > _______________________________________________________ > > Linux-HA-Dev: [email protected] > > http://lists.linux-ha.org/mailman/listinfo/linux-ha-dev > > Home Page: http://linux-ha.org/ > > _______________________________________________________ > Linux-HA-Dev: [email protected] > http://lists.linux-ha.org/mailman/listinfo/linux-ha-dev > Home Page: http://linux-ha.org/ _______________________________________________________ Linux-HA-Dev: [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha-dev Home Page: http://linux-ha.org/
