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Linux 下設定多路徑及SCSI掃描磁碟重新發現大小

2020-06-16 16:33:59

Linux SCSI掃描磁碟重新發現大小:

# for i in `find /sys/class/scsi_host/host*`; do echo 1 >> $i/issue_lip; echo "- - -" >> $i/scan; done

1、安裝多路徑軟體包:
device-mapper-1.02.67-2.el5
device-mapper-event-1.02.67.2.el5
device-mapper-multipath-0.4.7-48.el5

[root@RKDB01 Server]# rpm -ivh device-mapper-1.02.67-2.el5.x86_64.rpm
warning: device-mapper-1.02.67-2.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 37017186
Preparing... ########################################### [100%]
 package device-mapper-1.02.67-2.el5.x86_64 is already installed
[root@RKDB01 Server]# rpm -ivh device-mapper-event-1.02.67-2.el5.x86_64.rpm
warning: device-mapper-event-1.02.67-2.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 37017186
Preparing... ########################################### [100%]
 package device-mapper-event-1.02.67-2.el5.x86_64 is already installed
[root@RKDB01 Server]# rpm -ivh device-mapper-multipath-0.4.7-48.el5.x86_64.rpm
warning: device-mapper-multipath-0.4.7-48.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 37017186
Preparing... ########################################### [100%]
 package device-mapper-multipath-0.4.7-48.el5.x86_64 is already installed

2、設定開機啟動,並檢查安裝包是否正常:
# chkconfig --level 345 multipathd on
# lsmod |grep dm_multipath

[root@RKDB01 Server]# chkconfig --level 345 multipathd on
[root@RKDB01 Server]# lsmod |grep dm_multipath
dm_multipath 58969 0
scsi_dh 42561 1 dm_multipath
dm_mod 102417 4 dm_mirror,dm_multipath,dm_raid45,dm_log

3、設定multipathd 使其正常工作,編輯/etc/multipath.conf,開放如下內容:

defaults {
  udev_dir /dev
  polling_interval 10
  selector "round-robin 0"
  path_grouping_policy multibus
  getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
  prio_callout none
  path_checker readsector0
  rr_min_io 100
  max_fds 8192
  rr_weight priorities
  failback immediate
  no_path_retry fail
  user_friendly_names yes
}
blacklist {
  wwid 26353900f02796769
  devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
  devnode "^hd[a-z]"
}

4、並關閉如下內容

#blacklist {
#    devnode "*"
#}
#defaults {
 27 #    user_friendly_names yes
 28 #}

5、完成之後執行如下命令發現多路徑:

[root@RKDB01 Server]# modprobe dm-multipath
[root@RKDB01 Server]# multipath -F
[root@RKDB01 Server]# multipath dm-multipath
[root@RKDB01 Server]# multipath dm-round-robin
[root@RKDB01 Server]# service multipathd restart
正在關閉multipathd 埠監控程式: [確定]
正在啟動守護行程multipathd: [確定]


[root@RKDB01 Server]# multipath -v2
[root@RKDB01 Server]# multipath -v2
[root@RKDB01 Server]# multipath -ll
mpath1 (3600d02310000011b16a5d57c6a1bd99a) dm-0 TOYOU,NetStor_iSUM510
[size=3.3T][features=0][hwhandler=0][rw]
_ round-robin 0 [prio=2][ena bled]
 _ 1:0:0:0 sdb 8:16 [failed][ready]
 _ 1:0:1:0 sdc 8:32 [failed][ready]

6、重新啟動伺服器後,我們可以看到多路徑資訊了:

[root@RKDB01 ~]# ll /dev/mapper/
總計 0
crw------- 1 root root 10, 60 11-05 22:35 control
brw-rw---- 1 root disk 253, 0 11-05 22:35 mpath1
brw-rw---- 1 root disk 253, 1 11-05 22:35 mpath2


[root@RKDB01 ~]# multipath -ll
mpath2 (3600d02310000011b76128b9c63138cf4) dm-1 TOYOU,NetStor_iSUM510
[size=3.2T][features=0][hwhandler=0][rw]
_ round-robin 0 [prio=2][active]
 _ 1:0:0:1 sdc 8:32 [active][ready]
 _ 1:0:1:1 sde 8:64 [active][ready]
mpath1 (3600d02310000011b16a5d57c6a1bd99a) dm-0 TOYOU,NetStor_iSUM510
[size=20G][features=0][hwhandler=0][rw]
_ round-robin 0 [prio=2][active]
 _ 1:0:0:0 sdb 8:16 [active][ready]
 _ 1:0:1:0 sdd 8:48 [active][ready]

7、通過fdisk 看可以生成了DM-0/DM-1兩個盤,正是上面sdc/sde,sdb/sdd多路徑後出來的:

[root@RKDB01 ~]# fdisk -l
Disk /dev/sda: 299.4 GB, 299439751168 bytes
255 heads, 63 sectors/track, 36404 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
 Device Boot Start End Blocks Id System
/dev/sda1 * 1 38 305203+ 83 Linux
/dev/sda2 39 13092 104856255 83 Linux
/dev/sda3 13093 19619 52428127+ 83 Linux
/dev/sda4 19620 36404 134825512+ 5 Extended
/dev/sda5 19620 26146 52428096 83 Linux
/dev/sda6 26147 28757 20972826 83 Linux
/dev/sda7 28758 30324 12586896 82 Linux swap / Solaris
/dev/sda8 30325 36404 48837568+ 83 Linux
Disk /dev/sdb: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/sdb doesn't contain a valid partition table
Disk /dev/sdc: 3568.4 GB, 3568429957120 bytes
255 heads, 63 sectors/track, 433836 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/sdc doesn't contain a valid partition table
Disk /dev/sdd: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/sdd doesn't contain a valid partition table
Disk /dev/sde: 3568.4 GB, 3568429957120 bytes
255 heads, 63 sectors/track, 433836 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/sde doesn't contain a valid partition table
Disk /dev/dm-0: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/dm-0 doesn't contain a valid partition table
Disk /dev/dm-1: 3568.4 GB, 3568429957120 bytes
255 heads, 63 sectors/track, 433836 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/dm-1 doesn't contain a valid partition table
Disk /dev/sdf: 4009 MB, 4009754624 bytes
255 heads, 63 sectors/track, 487 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
 Device Boot Start End Blocks Id System
/dev/sdf4 * 1 488 3915744+ b W95 FAT32
Partition 4 has different physical/logical endings:
 phys=(486, 254, 63) logical=(487, 125, 22)

8、我們同時也可以在/dev/mapper目錄中檢視到多路徑對映的資訊:

[root@RKDB01 ~]# ll /dev/mapper/
總計 0
crw------- 1 root root 10, 60 11-06 00:49 control
brw-rw---- 1 root disk 253, 2 11-06 00:49 data-data001
brw-rw---- 1 root disk 253, 0 11-06 00:49 mpath1
brw-rw---- 1 root disk 253, 1 11-06 00:49 mpath2

9、參考:

Red_Hat_Enterprise_Linux-5-DM_Multipath-en-US.pdf

Red_Hat_Enterprise_Linux-5-DM_Multipath-zh-CN.pdf

Red_Hat_Enterprise_Linux-6-DM_Multipath-en-US.pdf

Red_Hat_Enterprise_Linux-6-DM_Multipath-zh-CN.pdf


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