New Server that has no LUNs
Make sue that there is not Attached LUNs by cechking "/proc/scsi/scsi":
As you have only Direct Attached Disks, you will see them only under "/dev/disk/by-path":
Check How many Fibre Channel Cards (HBAs), you have two: "host0" and "host1"
Refresh LUNs list to discover new mapped LUNs to your OS:
Now, there are 20 LUNs attached to your OS:
Vendor: IBM
Model: 2145
Optional: Find Device instructions to e added to "/etc/multipath.conf" configuration file:
RHEL 7
Set initial configuration for "multipathd" daemon using "mpathconf" command:
Adjust the "multipath" configurations as you need, here is just an example:
List the new 'multipath -ll' output:
[root@B54LFRTMPSTG01 ~]# hostname && cat /etc/redhat-release B54LFRTMPSTG01 Red Hat Enterprise Linux Server release 7.4 (Maipo)
Make sue that there is not Attached LUNs by cechking "/proc/scsi/scsi":
[root@B54LFRTMPSTG01 ~]# cat /proc/scsi/scsi Attached devices:
As you have only Direct Attached Disks, you will see them only under "/dev/disk/by-path":
[root@B54LFRTMPSTG01 ~]# ls -lha /dev/disk/by-path/ total 0 drwxr-xr-x 2 root root 100 Apr 28 11:29 . drwxr-xr-x 5 root root 100 Apr 23 10:34 .. lrwxrwxrwx 1 root root 16 Apr 23 10:35 pci-0000:0b:08.0-cciss-disk0 -> ../../cciss/c0d0 lrwxrwxrwx 1 root root 18 Apr 23 10:35 pci-0000:0b:08.0-cciss-disk0-part1 -> ../../cciss/c0d0p1 lrwxrwxrwx 1 root root 18 Apr 23 10:35 pci-0000:0b:08.0-cciss-disk0-part2 -> ../../cciss/c0d0p2
Check How many Fibre Channel Cards (HBAs), you have two: "host0" and "host1"
[root@B54LFRTMPSTG01 ~]# ls /sys/class/fc_host host0 host1
Refresh LUNs list to discover new mapped LUNs to your OS:
[root@B54LFRTMPSTG01 ~]# echo "1" > /sys/class/fc_host/host0/issue_lip [root@B54LFRTMPSTG01 ~]# echo "- - -" > /sys/class/scsi_host/host0/scan
[root@B54LFRTMPSTG01 ~]# echo "1" > /sys/class/fc_host/host1/issue_lip [root@B54LFRTMPSTG01 ~]# echo "- - -" > /sys/class/scsi_host/host1/scan
Now, there are 20 LUNs attached to your OS:
Vendor: IBM
Model: 2145
[root@B54LFRTMPSTG01 ~]# cat /proc/scsi/scsi Attached devices: Host: scsi0 Channel: 00 Id: 01 Lun: 00 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi0 Channel: 00 Id: 01 Lun: 01 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi0 Channel: 00 Id: 01 Lun: 02 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi0 Channel: 00 Id: 01 Lun: 03 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi0 Channel: 00 Id: 01 Lun: 04 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi0 Channel: 00 Id: 00 Lun: 01 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi0 Channel: 00 Id: 00 Lun: 02 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi0 Channel: 00 Id: 00 Lun: 03 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi0 Channel: 00 Id: 00 Lun: 04 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi1 Channel: 00 Id: 00 Lun: 00 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi1 Channel: 00 Id: 00 Lun: 01 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi1 Channel: 00 Id: 00 Lun: 02 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi1 Channel: 00 Id: 00 Lun: 03 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi1 Channel: 00 Id: 00 Lun: 04 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi1 Channel: 00 Id: 01 Lun: 00 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi1 Channel: 00 Id: 01 Lun: 01 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi1 Channel: 00 Id: 01 Lun: 02 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi1 Channel: 00 Id: 01 Lun: 03 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi1 Channel: 00 Id: 01 Lun: 04 Vendor: IBM Model: 2145 Rev: 0000 Type: Direct-Access ANSI SCSI revision: 06
[root@B54LFRTMPSTG01 ~]# cat /proc/scsi/scsi | egrep -i 'Host:' | wc -l 20
[root@B54LFRTMPSTG01 ~]# fdisk -l 2>/dev/null | egrep '^Disk' | egrep -v 'dm-|type|identifier' Disk /dev/cciss/c0d0: 73.4 GB, 73372631040 bytes, 143305920 sectors Disk /dev/mapper/rhel-root: 21.5 GB, 21474836480 bytes, 41943040 sectors Disk /dev/mapper/rhel-swap: 7340 MB, 7340032000 bytes, 14336000 sectors Disk /dev/sda: 536.9 GB, 536870912000 bytes, 1048576000 sectors Disk /dev/sdb: 59.1 GB, 59055800320 bytes, 115343360 sectors Disk /dev/sdc: 59.1 GB, 59055800320 bytes, 115343360 sectors Disk /dev/sdd: 59.1 GB, 59055800320 bytes, 115343360 sectors Disk /dev/sde: 1073.7 GB, 1073741824000 bytes, 2097152000 sectors Disk /dev/sdf: 536.9 GB, 536870912000 bytes, 1048576000 sectors Disk /dev/sdg: 59.1 GB, 59055800320 bytes, 115343360 sectors Disk /dev/mapper/mpathc: 536.9 GB, 536870912000 bytes, 1048576000 sectors Disk /dev/mapper/mpathd: 59.1 GB, 59055800320 bytes, 115343360 sectors Disk /dev/sdh: 59.1 GB, 59055800320 bytes, 115343360 sectors Disk /dev/sdi: 59.1 GB, 59055800320 bytes, 115343360 sectors Disk /dev/mapper/mpathe: 59.1 GB, 59055800320 bytes, 115343360 sectors Disk /dev/sdj: 1073.7 GB, 1073741824000 bytes, 2097152000 sectors Disk /dev/mapper/mpathf: 59.1 GB, 59055800320 bytes, 115343360 sectors Disk /dev/mapper/mpathg: 1073.7 GB, 1073741824000 bytes, 2097152000 sectors Disk /dev/sdk: 536.9 GB, 536870912000 bytes, 1048576000 sectors Disk /dev/sdl: 59.1 GB, 59055800320 bytes, 115343360 sectors Disk /dev/sdm: 59.1 GB, 59055800320 bytes, 115343360 sectors Disk /dev/sdn: 59.1 GB, 59055800320 bytes, 115343360 sectors Disk /dev/sdo: 1073.7 GB, 1073741824000 bytes, 2097152000 sectors Disk /dev/sdp: 536.9 GB, 536870912000 bytes, 1048576000 sectors Disk /dev/sdq: 59.1 GB, 59055800320 bytes, 115343360 sectors Disk /dev/sdr: 59.1 GB, 59055800320 bytes, 115343360 sectors Disk /dev/sds: 59.1 GB, 59055800320 bytes, 115343360 sectors Disk /dev/sdt: 1073.7 GB, 1073741824000 bytes, 2097152000 sectors
Optional: Find Device instructions to e added to "/etc/multipath.conf" configuration file:
RHEL 7
[root@B54LFRTMPSTG01 ~]# multipath -t | grep -B2 -A8 2145
device {
vendor "IBM"
product "^2145"
path_grouping_policy "group_by_prio"
path_checker "tur"
features "1 queue_if_no_path"
hardware_handler "0"
prio "alua"
failback immediate
rr_weight "uniform"
}
RHEL 6
[root@fcsmpsql4:~]# grep -B2 -A12 2145 /usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf.defaults
# device {
# vendor "IBM"
# product "^2145"
# path_grouping_policy group_by_prio
# getuid_callout "/lib/udev/scsi_id --whitelisted --device=/dev/%n"
# path_selector "round-robin 0"
# path_checker tur
# features "1 queue_if_no_path"
# hardware_handler "0"
# prio alua
# failback immediate
# rr_weight uniform
# rr_min_io 1000
# rr_min_io_rq 1
# }
Set initial configuration for "multipathd" daemon using "mpathconf" command:
mpathconf --enable --user_friendly_names n'
Adjust the "multipath" configurations as you need, here is just an example:
[root@B54LFRTMPSTG01 ~]# grep -v ^# /etc/multipath.conf | awk NF
defaults {
user_friendly_names yes
find_multipaths yes
}
devices {
device {
vendor "IBM"
product "^2145"
path_grouping_policy "group_by_prio"
path_checker "tur"
features "1 queue_if_no_path"
hardware_handler "0"
prio "alua"
failback immediate
rr_weight "uniform"
}
}
[root@B54LFRTMPSTG01 ~]# systemctl restart multipathd
List the new 'multipath -ll' output:
[root@B54LFRTMPSTG01 ~]# multipath -ll mpathe (3600507680c800507f0000000000000c6) dm-4 IBM ,2145 size=55G features='1 queue_if_no_path' hwhandler='0' wp=rw |-+- policy='service-time 0' prio=50 status=active | |- 0:0:0:2 sdh 8:112 active ready running | `- 1:0:0:2 sdm 8:192 active ready running `-+- policy='service-time 0' prio=10 status=enabled |- 0:0:1:2 sdc 8:32 active ready running `- 1:0:1:2 sdr 65:16 active ready running mpathd (3600507680c800507f0000000000000c5) dm-3 IBM ,2145 size=55G features='1 queue_if_no_path' hwhandler='0' wp=rw |-+- policy='service-time 0' prio=50 status=active | |- 0:0:0:1 sdg 8:96 active ready running | `- 1:0:0:1 sdl 8:176 active ready running `-+- policy='service-time 0' prio=10 status=enabled |- 0:0:1:1 sdb 8:16 active ready running `- 1:0:1:1 sdq 65:0 active ready running mpathc (3600507680c800507f0000000000000c4) dm-2 IBM ,2145 size=500G features='1 queue_if_no_path' hwhandler='0' wp=rw |-+- policy='service-time 0' prio=50 status=active | |- 0:0:0:0 sdf 8:80 active ready running | `- 1:0:0:0 sdk 8:160 active ready running `-+- policy='service-time 0' prio=10 status=enabled |- 0:0:1:0 sda 8:0 active ready running `- 1:0:1:0 sdp 8:240 active ready running mpathg (3600507680c800507f0000000000000c8) dm-6 IBM ,2145 size=1000G features='1 queue_if_no_path' hwhandler='0' wp=rw |-+- policy='service-time 0' prio=50 status=active | |- 0:0:0:4 sdj 8:144 active ready running | `- 1:0:0:4 sdo 8:224 active ready running `-+- policy='service-time 0' prio=10 status=enabled |- 0:0:1:4 sde 8:64 active ready running `- 1:0:1:4 sdt 65:48 active ready running mpathf (3600507680c800507f0000000000000c7) dm-5 IBM ,2145 size=55G features='1 queue_if_no_path' hwhandler='0' wp=rw |-+- policy='service-time 0' prio=50 status=active | |- 0:0:0:3 sdi 8:128 active ready running | `- 1:0:0:3 sdn 8:208 active ready running `-+- policy='service-time 0' prio=10 status=enabled |- 0:0:1:3 sdd 8:48 active ready running `- 1:0:1:3 sds 65:32 active ready running
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