Our z/VM is Version 5.4. z/Linux is SUSE 11 SP1. I'm going to add one SCSI disk(from 2 FCP type sub-channels,to 2 SAN switchs, to 2 HBA port of DS8000) and use multipath. The following is what I did: (1)use YAST2 to add 2 zfcp disks(actually they are one SCSI disk). successful
(2)use mkinitrd command. The response messages are different with those of SUSE 10, I'm not sure if they are correct. LXCPOA:/ # mkinitrd Kernel image: /boot/image-2.6.32.12-0.7-default Initrd image: /boot/initrd-2.6.32.12-0.7-default Root device: /dev/disk/by-path/ccw-0.0.0200-part1 (/dev/dasda1) (mounted on / as ext3) Kernel Modules: jbd mbcache ext3 dasd_mod dasd_eckd_mod Features: block dasd resume.userspace resume.kernel 25502 blocks (3)use zipl command. The response messages are also different with those of SUSE 10, I'm not sure if they are correct. LXCPOA:/ # zipl Using config file '/etc/zipl.conf' Building bootmap in '/boot/zipl' Building menu 'menu' Adding #1: IPL section 'SLES11_SP1' (default) Adding #2: IPL section 'FailsafeV1' Adding #3: IPL section 'ipl' Preparing boot device: dasda (0200). Done. (4)use lsscsi command to show available zfcp disks. And check their information. successful(I think) LXCPOA:/ # lsscsi [0:0:0:1073758208]disk IBM 2107900 3.44 /dev/sda [1:0:0:1073758208]disk IBM 2107900 3.44 /dev/sdb LXCPOA:/ # cat /sys/class/scsi_device/0:0:0:1073758208/device/fcp_lun 0x4000400000000000 LXCPOA:/ # cat /sys/class/scsi_device/0:0:0:1073758208/device/wwpn 0x5005076308034621 LXCPOA:/ # cat /sys/class/scsi_device/0:0:0:1073758208/device/hba_id 0.0.3300 LXCPOA:/ # cat /sys/class/scsi_device/1:0:0:1073758208/device/fcp_lun 0x4000400000000000 LXCPOA:/ # cat /sys/class/scsi_device/1:0:0:1073758208/device/wwpn 0x5005076308134621 LXCPOA:/ # cat /sys/class/scsi_device/1:0:0:1073758208/device/hba_id 0.0.3f00 (5)At this point, there is no multipath.conf file in system, so I created new one. LXCPOA:/etc # cat multipath.conf multipaths{ multipath{ wwid 36005076308ffc6210000000000000000 alias mpvol1 } } (6)I want to enable new alias, so I enable multipath again. But nothing is shown, is there a error? LXCPOA:/etc # multipath LXCPOA:/etc # (7)use YAST2 to have a file system created on it and mounted. successfuly (8)check new directory. I don't know why my alias to this disk is not used!!! LXCPOA:/ # df -h Filesystem Size Used Avail Use% Mounted on /dev/dasda1 2.3G 438M 1.8G 20% / devtmpfs 497M 204K 497M 1% /dev tmpfs 497M 100K 497M 1% /dev/shm /dev/dasdb1 2.3G 1.9G 293M 87% /usr /dev/dasdc1 2.3G 1.4G 813M 63% /usr/share /dev/dasdd1 2.3G 195M 2.0G 9% /var /dev/mapper/36005076308ffc6210000000000000000_part1 778G 197M 738G 1% /vol1 1244.70 2.54 9955.06 6778 26563184 (9)I upload a 1G file by FTP to new directory to check if IO load is balanced among 2 paths. Is balance sucessful? Why the "tps" value for dm-0 and dm-1 is so different? LXCPOA:/ # iostat Linux 2.6.32.12-0.7-default (LXCPOA) 09/07/2011 _s390x_ avg-cpu: %user %nice %system %iowait %steal %idle 2.62 0.01 2.66 1.02 0.36 93.33 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn dasda 2.66 116.17 98.00 317808 268112 dasdb 1.22 121.49 0.27 332352 744 dasdc 1.15 83.30 0.97 227896 2664 dasde 0.06 1.74 0.00 4764 0 dasdd 0.97 13.11 15.88 35856 43432 dasdf 0.02 0.46 0.00 1248 0 dasdg 0.02 0.46 0.00 1248 0 dasdh 0.02 0.46 0.00 1248 0 sda 8.68 17.53 5090.43 47962 13926104 dm-0 17.07 17.12 10194.13 46834 27888488 sdb 8.42 0.52 5103.70 1432 13962384 dm-1 1274.58 2.49 10194.13 6818 27888480 Many Thanks!!! ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/