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!!!
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