On Fri, Jan 21, 2011 at 3:58 PM, Ross Walker <rswwalker at gmail.com> wrote: > On Jan 21, 2011, at 6:41 PM, Edward Morbius <dredmorbius at gmail.com> wrote: > > We've been wrestling with this for ... rather longer than I'd care to > admit. > > Host / initiator systems are a number of real and virtualized CentOS 5.5 > boxes. Storage arrays / targets are Dell MD3220i storage arrays. > > ... > > > You need the RDAC kernel module installed, this handles asymmetric > multipathing to these devices. > > You can get this from Dell's site. > > Once this is installed you need to setup dm-multipath, look for > multipathd.conf in /etc, get the product id and vendor id from dmesg after > making an initial connection via open-iscsi and use that in the mutipath > config. Your going to need to use path utility 'rdac' in the config instead > of tur. > > Google is your friend here. > We've got *an* rdac module installed. Any way of telling whether or not this is Dell's? RPM says these are from kernel-2.6.18-194.17.1.el5.src.rpm. $ lsmod | grep rdac scsi_dh_rdac 43977 0 scsi_dh 42177 2 scsi_dh_rdac,dm_multipath scsi_mod 196953 14 scsi_dh_rdac,be2iscsi,ib_iser,iscsi_tcp,bnx2i,cxgb3i,libiscsi2,scsi_transport_iscsi2,scsi_dh,sr_mod,sg,libata,megaraid_sas,sd_mod $ rpm -qif $(locate rdac.ko) Name : kernel Relocations: (not relocatable) Version : 2.6.18 Vendor: CentOS Release : 194.17.1.el5 Build Date: Wed 29 Sep 2010 11:57:11 AM PDT Install Date: Thu 14 Oct 2010 02:17:14 PM PDT Build Host: builder10.centos.org Group : System Environment/Kernel Source RPM: kernel-2.6.18-194.17.1.el5.src.rpm Size : 96488290 License: GPLv2 Signature : DSA/SHA1, Thu 30 Sep 2010 08:35:49 AM PDT, Key ID a8a447dce8562897 URL : http://www.kernel.org/ Summary : The Linux kernel (the core of the Linux operating system) Description : The kernel package contains the Linux kernel (vmlinuz), the core of any Linux operating system. The kernel handles the basic functions of the operating system: memory allocation, process allocation, device input and output, etc. Name : kernel Relocations: (not relocatable) Version : 2.6.18 Vendor: CentOS Release : 194.17.1.el5 Build Date: Wed 29 Sep 2010 11:57:11 AM PDT Install Date: Thu 14 Oct 2010 02:17:14 PM PDT Build Host: builder10.centos.org Group : System Environment/Kernel Source RPM: kernel-2.6.18-194.17.1.el5.src.rpm Size : 96488290 License: GPLv2 Signature : DSA/SHA1, Thu 30 Sep 2010 08:35:49 AM PDT, Key ID a8a447dce8562897 URL : http://www.kernel.org/ Summary : The Linux kernel (the core of the Linux operating system) Description : The kernel package contains the Linux kernel (vmlinuz), the core of any Linux operating system. The kernel handles the basic functions of the operating system: memory allocation, process allocation, device input and output, etc. There's also a rebuild of 'sg', with a source tree in /usr/src/sg-3.5.34dell Diffing sources: $ diff sg.c sg.c_rhel5 22c22 < #define SG_VERSION_STR "3.5.34dell" --- > #define SG_VERSION_STR "3.5.34" 1879c1879 < sg->length = (ret_sz > num) ? num : ret_sz; --- > sg->length = ret_sz; I'll also note that Dell isn't playing nice with its package installs -- some stuff is under /opt/dell, some is installed via RPM, some appears to be tossed arbitrarily onto the system: $ rpm -qif /lib/modules/2.6.18-194.17.1.el5/extra/sg.ko file /lib/modules/2.6.18-194.17.1.el5/extra/sg.ko is not owned by any package Bad Dell. No donut. > > -Ross > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > > -- Dr. Ed Morbius Chief Scientist Krell Power Systems Unlimited -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20110121/ddf9071a/attachment-0003.html>