Changes between Initial Version and Version 1 of CentOS55iSCSI

Timestamp:

Feb 15, 2011 4:31:57 PM (15 years ago)

Author:

iva

Comment:

--

CentOS55iSCSI

@@ +1 @@
+== iSCSI Storage on CentOS 5.5 ==
+
+There are two virtual machines running the CentOS 5.5 operating system:
+
+  ip=192.168.228.152 hostname=el5-32 -- iSCSI server (target)
+
+  ip=192.168.228.153 hostname=el5-32-2 -- iSCSI client (initiator)
+
+=== Configure iSCSI server (target) ===
+
+{{{
+# uname -nr
+el5-32 2.6.18-194.32.1.el5
+# ifconfig eth0 | grep 'inet addr'
+          inet addr:192.168.228.152  Bcast:192.168.228.255  Mask:255.255.255.0
+#
+# rpm -q scsi-target-utils
+scsi-target-utils-0.0-6.20091205snap.el5_5.3
+#
+}}}
+
+* Start the SCSI target daemon.
+
+{{{
+# service tgtd start
+Starting SCSI target daemon: Starting target framework daemon
+
+# service tgtd status
+tgtd (pid 2697 2696) is running...
+# chkconfig tgtd on
+# chkconfig --list tgtd
+tgtd            0:off   1:off   2:on    3:on    4:on    5:on    6:off
+#
+}}}
+
+* Create target device, then check current configuration.
+
+In the following example {{{02130152}}} is a substitute for a random hexadecimal number, where {{{0213}}} represents current date (MMDD), {{{0}}} - just a zero, and {{{152}}} is the fourth octet in server's IP address.
+
+{{{
+# tgtadm --lld iscsi --op new --mode target --tid 1 -T iqn.2001-04.com.stgt:`uname -n`-02130152
+#
+# tgtadm --lld iscsi --op show --mode target
+Target 1: iqn.2001-04.com.stgt:el5-32-02130152
+    System information:
+        Driver: iscsi
+        State: ready
+    I_T nexus information:
+    LUN information:
+        LUN: 0
+            Type: controller
+            SCSI ID: IET     00010000
+            SCSI SN: beaf10
+            Size: 0 MB
+            Online: Yes
+            Removable media: No
+            Backing store type: rdwr
+            Backing store path: None
+    Account information:
+    ACL information:
+#
+}}}
+
+* Add logical unit to the target, enable it to accept initiators from the local network.
+
+{{{
+# fdisk -l /dev/sdb
+
+Disk /dev/sdb: 8589 MB, 8589934592 bytes
+255 heads, 63 sectors/track, 1044 cylinders
+Units = cylinders of 16065 * 512 = 8225280 bytes
+
+   Device Boot      Start         End      Blocks   Id  System
+/dev/sdb1               1        1044     8385898+  83  Linux
+#
+# mount |grep sdb
+#
+#
+# tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 -b /dev/sdb1
+#
+# tgtadm --lld iscsi --op bind --mode target --tid 1 -I 192.168.228.0/24
+#
+# tgtadm --lld iscsi --op show --mode target
+Target 1: iqn.2001-04.com.stgt:el5-32-02130152
+    System information:
+        Driver: iscsi
+        State: ready
+    I_T nexus information:
+    LUN information:
+        LUN: 0
+            Type: controller
+            SCSI ID: IET     00010000
+            SCSI SN: beaf10
+            Size: 0 MB
+            Online: Yes
+            Removable media: No
+            Backing store type: rdwr
+            Backing store path: None
+        LUN: 1
+            Type: disk
+            SCSI ID: IET     00010001
+            SCSI SN: beaf11
+            Size: 8587 MB
+            Online: Yes
+            Removable media: No
+            Backing store type: rdwr
+            Backing store path: /dev/sdb1
+    Account information:
+    ACL information:
+        192.168.228.0/24
+#
+}}}
+
+* Save current configuration.
+
+{{{
+# tgt-admin --dump >/etc/tgt/targets.conf
+#
+# cat /etc/tgt/targets.conf
+default-driver iscsi
+
+<target iqn.2001-04.com.stgt:el5-32-02130152>
+        backing-store /dev/sdb1
+        initiator-address 192.168.228.0/24
+</target>
+
+#
+}}}
+
+=== Configure iSCSI client (initiator) ===
+
+{{{
+# uname -nr
+el5-32-2 2.6.18-194.32.1.el5
+# ifconfig eth0 | grep 'inet addr'
+          inet addr:192.168.228.153  Bcast:192.168.228.255  Mask:255.255.255.0
+#
+# rpm -q iscsi-initiator-utils
+iscsi-initiator-utils-6.2.0.871-0.20.el5_5
+#
+# cat /etc/iscsi/initiatorname.iscsi
+InitiatorName=iqn.1994-05.com.redhat:d91b4739849
+#
+# service iscsi status
+iscsid (pid  1391) is running...
+# chkconfig --list iscsi
+iscsi           0:off   1:off   2:off   3:on    4:on    5:on    6:off
+#
+}}}
+
+* Query the storage server for available targets.
+
+{{{
+# iscsiadm --mode discovery --type sendtargets --portal  192.168.228.152
+192.168.228.152:3260,1 iqn.2001-04.com.stgt:el5-32-02130152
+#
+}}}
+
+* Acquire the target.
+
+{{{
+# iscsiadm --mode node --targetname iqn.2001-04.com.stgt:el5-32-02130152 --portal 192.168.228.152:3260 --login
+Logging in to [iface: default, target: iqn.2001-04.com.stgt:el5-32-02130152, portal: 192.168.228.152,3260]
+Login to [iface: default, target: iqn.2001-04.com.stgt:el5-32-02130152, portal: 192.168.228.152,3260]: successful
+#
+# grep "`date '+%b %e %H'`" /var/log/messages 
+Feb 13 22:24:06 el5-32-2 kernel: scsi1 : iSCSI Initiator over TCP/IP
+Feb 13 22:24:07 el5-32-2 kernel:   Vendor: IET       Model: Controller        Rev: 0001
+Feb 13 22:24:07 el5-32-2 kernel:   Type:   RAID                               ANSI SCSI revision: 05
+Feb 13 22:24:07 el5-32-2 kernel: scsi 1:0:0:0: Attached scsi generic sg1 type 12
+Feb 13 22:24:07 el5-32-2 kernel:   Vendor: IET       Model: VIRTUAL-DISK      Rev: 0001
+Feb 13 22:24:07 el5-32-2 kernel:   Type:   Direct-Access                      ANSI SCSI revision: 05
+Feb 13 22:24:07 el5-32-2 kernel: SCSI device sdb: 16771797 512-byte hdwr sectors (8587 MB)
+Feb 13 22:24:07 el5-32-2 kernel: sdb: Write Protect is off
+Feb 13 22:24:07 el5-32-2 kernel: SCSI device sdb: drive cache: write back
+Feb 13 22:24:07 el5-32-2 kernel: SCSI device sdb: 16771797 512-byte hdwr sectors (8587 MB)
+Feb 13 22:24:07 el5-32-2 kernel: sdb: Write Protect is off
+Feb 13 22:24:07 el5-32-2 kernel: SCSI device sdb: drive cache: write back
+Feb 13 22:24:07 el5-32-2 kernel:  sdb: unknown partition table
+Feb 13 22:24:07 el5-32-2 kernel: sd 1:0:0:1: Attached scsi disk sdb
+Feb 13 22:24:07 el5-32-2 kernel: sd 1:0:0:1: Attached scsi generic sg2 type 0
+Feb 13 22:24:07 el5-32-2 iscsid: connection1:0 is operational now
+#
+# iscsiadm --mode node --targetname iqn.2001-04.com.stgt:el5-32-02130152 --portal 192.168.228.152:3260 --op update -n node.startup -v automatic
+#
+}}}
+
+* Check client status.
+
+{{{
+# iscsiadm -m session
+tcp: [1] 192.168.228.152:3260,1 iqn.2001-04.com.stgt:el5-32-02130152
+#
+# iscsiadm -m session -P 1
+Target: iqn.2001-04.com.stgt:el5-32-02130152
+        Current Portal: 192.168.228.152:3260,1
+        Persistent Portal: 192.168.228.152:3260,1
+                **********
+                Interface:
+                **********
+                Iface Name: default
+                Iface Transport: tcp
+                Iface Initiatorname: iqn.1994-05.com.redhat:d91b4739849
+                Iface IPaddress: 192.168.228.153
+                Iface HWaddress: <empty>
+                Iface Netdev: <empty>
+                SID: 1
+                iSCSI Connection State: LOGGED IN
+                iSCSI Session State: LOGGED_IN
+                Internal iscsid Session State: NO CHANGE
+#
+}}}
+
+* Create new storage partition. Notice that disk geometry is different from that reported on the server (above).
+
+{{{
+# fdisk /dev/sdb
+ [...]
+# fdisk -l /dev/sdb
+
+Disk /dev/sdb: 8587 MB, 8587160064 bytes
+64 heads, 32 sectors/track, 8189 cylinders
+Units = cylinders of 2048 * 512 = 1048576 bytes
+
+   Device Boot      Start         End      Blocks   Id  System
+/dev/sdb1               1        8189     8385520   83  Linux
+#
+}}}
+
+* Create new file system.
+
+{{{
+# mkfs -t ext3 /dev/sdb1
+mke2fs 1.39 (29-May-2006)
+Filesystem label=
+OS type: Linux
+Block size=4096 (log=2)
+Fragment size=4096 (log=2)
+1048576 inodes, 2096380 blocks
+104819 blocks (5.00%) reserved for the super user
+First data block=0
+Maximum filesystem blocks=2147483648
+64 block groups
+32768 blocks per group, 32768 fragments per group
+16384 inodes per group
+Superblock backups stored on blocks: 
+        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632
+
+Writing inode tables: done                            
+Creating journal (32768 blocks): done
+Writing superblocks and filesystem accounting information: done
+
+This filesystem will be automatically checked every 24 mounts or
+180 days, whichever comes first.  Use tune2fs -c or -i to override.
+#
+}}}
+
+* Configure new mount point, mount the file system.
+
+{{{
+# vi /etc/fstab 
+# tail -1 /etc/fstab
+/dev/sdb1       /mnt    ext3    _netdev,defaults        1 2
+#
+# chkconfig netfs on
+# chkconfig --list netfs
+netfs           0:off   1:off   2:on    3:on    4:on    5:on    6:off
+#
+# service netfs start
+No devices found
+Setting up Logical Volume Management:                      [  OK  ]
+Checking network-attached filesystems
+/dev/sdb1: clean, 12/1048576 files, 70322/2096380 blocks
+                                                           [  OK  ]
+Mounting other filesystems:                                [  OK  ]
+#
+#
+# mount |grep sdb
+/dev/sdb1 on /mnt type ext3 (rw,_netdev)
+#
+# df -h /dev/sdb1
+Filesystem            Size  Used Avail Use% Mounted on
+/dev/sdb1             7.9G  147M  7.4G   2% /mnt
+#
+}}}
+
+=== iSCSI server status ===
+
+{{{
+# tgtadm --lld iscsi --op show --mode target
+Target 1: iqn.2001-04.com.stgt:el5-32-02130152
+    System information:
+        Driver: iscsi
+        State: ready
+    I_T nexus information:
+        I_T nexus: 1
+            Initiator: iqn.1994-05.com.redhat:d91b4739849
+            Connection: 0
+                IP Address: 192.168.228.153
+    LUN information:
+        LUN: 0
+            Type: controller
+            SCSI ID: IET     00010000
+            SCSI SN: beaf10
+            Size: 0 MB
+            Online: Yes
+            Removable media: No
+            Backing store type: rdwr
+            Backing store path: None
+        LUN: 1
+            Type: disk
+            SCSI ID: IET     00010001
+            SCSI SN: beaf11
+            Size: 8587 MB
+            Online: Yes
+            Removable media: No
+            Backing store type: rdwr
+            Backing store path: /dev/sdb1
+    Account information:
+    ACL information:
+        192.168.228.0/24
+#
+#
+}}}
+
+=== See Also ===
+
+file:///usr/share/doc/scsi-target-utils-0.0/README.iscsi
+
+file:///usr/share/doc/scsi-target-utils-0.0/README.lu_configuration
+
+