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knowledge:use_an_iscsi_target_from_linux

Preparation

Install open-iscsi, at least on Debian systems.

Use an iSCSI target from Linux

In our setup a Synology NAS at 172.16.200.19 provides the targets.

First, run

 iscsiadm -m discovery -t sendtargets -p 172.16.200.19

to discover all provided targets.

You get something like this

 172.16.200.19:3260,1 iqn.2000-01.com.synology:nas.Target-GitLab.db1c0541e7
 [fe80::211:32ff:febe:da31]:3260,1 iqn.2000-01.com.synology:nas.Target-GitLab.db1c0541e7
 172.16.200.19:3260,1 iqn.2000-01.com.synology:nas.Target-Bitwarden.db1c0541e7
 [fe80::211:32ff:febe:da31]:3260,1 iqn.2000-01.com.synology:nas.Target-Bitwarden.db1c0541e7
 172.16.200.19:3260,1 iqn.2000-01.com.synology:nas.Target-Nextcloud.db1c0541e7
 [fe80::211:32ff:febe:da31]:3260,1 iqn.2000-01.com.synology:nas.Target-Nextcloud.db1c0541e7
 172.16.200.19:3260,1 iqn.2000-01.com.synology:nas.Target-MariaDB.db1c0541e7
 [fe80::211:32ff:febe:da31]:3260,1 iqn.2000-01.com.synology:nas.Target-MariaDB.db1c0541e7
 172.16.200.19:3260,1 iqn.2000-01.com.synology:nas.Target-Backup.db1c0541e7
 [fe80::211:32ff:febe:da31]:3260,1 iqn.2000-01.com.synology:nas.Target-Backup.db1c0541e7

Now, connect to the target using

 iscsiadm -m node --targetname "iqn.2000-01.com.synology:nas.Target-Backup.db1c0541e7" \
   --portal 172.16.200.19 --login

A new SCSI device will be created. Check the name of the device using dmesg. You see something like this

 [16924536.979916] scsi host13: iSCSI Initiator over TCP/IP
 [16924537.010635] scsi 13:0:0:1: Direct-Access     SYNOLOGY iSCSI Storage    4.0  PQ: 0 ANSI: 5
 [16924537.011449] sd 13:0:0:1: Attached scsi generic sg10 type 0
 [16924537.012597] sd 13:0:0:1: [sdj] 209715200 512-byte logical blocks: (107 GB/100 GiB)
 [16924537.012827] sd 13:0:0:1: [sdj] Write Protect is off
 [16924537.012828] sd 13:0:0:1: [sdj] Mode Sense: 43 00 10 08
 [16924537.013111] sd 13:0:0:1: [sdj] Write cache: enabled, read cache: enabled, supports DPO and FUA
 [16924537.013361] sd 13:0:0:1: [sdj] Optimal transfer size 16384 logical blocks > dev_max (8192 logical blocks)
 [16924537.018630] sd 13:0:0:1: [sdj] Attached SCSI disk

Now use fdisk, mkfs and if you like blkid on the new device and put it into the /etc/fstab.

Authenticated target

  iscsiadm   --mode node  --targetname "iqn.2007-01.org.debian.foobar:CDs"  -p 192.168.0.1:3260 --op=update --name node.session.auth.authmethod --value=CHAP
  iscsiadm   --mode node  --targetname "iqn.2007-01.org.debian.foobar:CDs"  -p 192.168.0.1:3260 --op=update --name node.session.auth.username --value=$Id
  iscsiadm   --mode node  --targetname "iqn.2007-01.org.debian.foobar:CDs"  -p 192.168.0.1:3260 --op=update --name node.session.auth.password --value=$MDP
  iscsiadm   --mode node  --targetname "iqn.2007-01.org.debian.foobar:CDs"  -p 192.168.0.1:3260 --login
knowledge/use_an_iscsi_target_from_linux.txt · Last modified: 2022/11/02 16:30 by wn

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