iSCSI command

iSCSI · 發表 2018-11-28 23:49:28

摘要：前言 iSCSI客戶端常用命令總是忘記，在此處記錄下。常用命令檢視當前session 掛載之前，一般如下圖所示： root@node-242:~# iscsiadm -m session iscsiadm: No active sessions. 掛載之後： ...

前言

iSCSI客戶端常用命令總是忘記，在此處記錄下。

常用命令

檢視當前session

掛載之前，一般如下圖所示：

root@node-242:~# iscsiadm -m session 
iscsiadm: No active sessions.

掛載之後：

root@node-242:~# iscsiadm -m session 
tcp: [2] 10.16.172.247:3260,1 iqn.2018-11.com:BEAN

root@node-242:~# iscsiadm -m session -P 3
iSCSI Transport Class version 2.0-870
version 2.0-871
Target: iqn.2018-11.com:BEAN
Current Portal: 10.16.172.247:3260,1
Persistent Portal: 10.16.172.247:3260,1
**********
Interface:
**********
Iface Name: default
Iface Transport: tcp
Iface Initiatorname: iqn.1993-08.org.debian:01:c9c12dd76e
Iface IPaddress: 10.16.172.242
Iface HWaddress: (null)
Iface Netdev: (null)
SID: 2
iSCSI Connection State: LOGGED IN
iSCSI Session State: LOGGED_IN
Internal iscsid Session State: NO CHANGE
************************
Negotiated iSCSI params:
************************
HeaderDigest: None
DataDigest: None
MaxRecvDataSegmentLength: 262144
MaxXmitDataSegmentLength: 1048576
FirstBurstLength: 262144
MaxBurstLength: 1048576
ImmediateData: Yes
InitialR2T: No
MaxOutstandingR2T: 1
************************
Attached SCSI devices:
************************
Host Number: 25State: running
scsi25 Channel 00 Id 0 Lun: 0
Attached scsi disk sdeState: running

根據IP 發現target

iscsiadm -m discovery -t st -p 10.16.172.246

輸出如下：

root@node-242:~# iscsiadm -m discovery -t st -p 10.16.172.246
10.16.172.246:3260,1 iqn.2018-11.com:BEAN
10.16.172.247:3260,1 iqn.2018-11.com:BEAN
10.16.172.248:3260,1 iqn.2018-11.com:BEAN

登入到指定target

iscsiadm -m node -T [target_name] -p [ip:3260] -l
 如下所示：
iscsiadm -m node -T iqn.2018-11.com:BEAN -p 10.16.172.246:3260 -l

輸出如下：

root@node-242:~# iscsiadm -m node -T iqn.2018-11.com:BEAN -p 10.16.172.246:3260 -l
Logging in to [iface: default, target: iqn.2018-11.com:BEAN, portal: 10.16.172.246,3260]
Login to [iface: default, target: iqn.2018-11.com:BEAN, portal: 10.16.172.246,3260]: successful

登入之後，可以用iscsiadm -m session檢視。結果一般如下所示：

root@node-242:~# iscsiadm -m session 
tcp: [3] 10.16.172.246:3260,1 iqn.2018-11.com:BEAN

登出指定target

iscsiadm -m node -T [target_name] -p [ip:3260] -u

具體指令如下所示：

root@node-242:~# iscsiadm -m node -T iqn.2018-11.com:BEAN -p 10.16.172.246:3260 -u
Logging out of session [sid: 3, target: iqn.2018-11.com:BEAN, portal: 10.16.172.246,3260]
Logout of [sid: 3, target: iqn.2018-11.com:BEAN, portal: 10.16.172.246,3260]: successful

登出之後，可以用iscsiadm -m session 檢查效果。

root@node-242:~# iscsiadm -m session 
iscsiadm: No active sessions.

資訊

一般來講，登入target之後會新增一個碟符，登入之前，lsblk輸出如下：

root@node2:~# lsblk
NAMEMAJ:MIN RMSIZE RO TYPE MOUNTPOINT
sda8:0030G0 disk 
├─sda18:107M0 part 
├─sda28:2022.2G0 part /
├─sda38:307.5G0 part [SWAP]
└─sda48:40261M0 part 
sdb8:160100G0 disk 
├─sdb18:1708G0 part 
└─sdb28:18092G0 part /data/osd.2
sdc8:3202T0 disk 
sr011:011024M0 rom

執行登入target之後：

root@node2:~# iscsiadm -m node -T iqn.2018-11.com:BEAN -p 10.16.172.246:3260 -l
Logging in to [iface: default, target: iqn.2018-11.com:BEAN, portal: 10.16.172.246,3260] (multiple)
Login to [iface: default, target: iqn.2018-11.com:BEAN, portal: 10.16.172.246,3260] successful.
root@node2:~# lsblk
NAMEMAJ:MIN RMSIZE RO TYPE MOUNTPOINT
sda8:0030G0 disk 
├─sda18:107M0 part 
├─sda28:2022.2G0 part /
├─sda38:307.5G0 part [SWAP]
└─sda48:40261M0 part 
sdb8:160100G0 disk 
├─sdb18:1708G0 part 
└─sdb28:18092G0 part /data/osd.2
sdc8:3202T0 disk 
sr011:011024M0 rom

我們可以看到新增了一個sdc。

如果確定sdc和iSCSI target的關係呢:

iscsiadm -m session -P 3

比如之前的輸出, sde這塊磁碟即iSCSI，來自 10.16.172.247:3260的Target: iqn.2018-11.com:BEAN

root@node-242:~# iscsiadm -m session -P 3
iSCSI Transport Class version 2.0-870
version 2.0-871
Target: iqn.2018-11.com:BEAN
Current Portal: 10.16.172.247:3260,1
Persistent Portal: 10.16.172.247:3260,1
**********
Interface:
**********
Iface Name: default
Iface Transport: tcp
Iface Initiatorname: iqn.1993-08.org.debian:01:c9c12dd76e
Iface IPaddress: 10.16.172.242
Iface HWaddress: (null)
Iface Netdev: (null)
SID: 2
iSCSI Connection State: LOGGED IN
iSCSI Session State: LOGGED_IN
Internal iscsid Session State: NO CHANGE
************************
Negotiated iSCSI params:
************************
HeaderDigest: None
DataDigest: None
MaxRecvDataSegmentLength: 262144
MaxXmitDataSegmentLength: 1048576
FirstBurstLength: 262144
MaxBurstLength: 1048576
ImmediateData: Yes
InitialR2T: No
MaxOutstandingR2T: 1
************************
Attached SCSI devices:
************************
Host Number: 25State: running
scsi25 Channel 00 Id 0 Lun: 0
Attached scsi disk sdeState: running