Setting Up tgtd As A SAN
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Note: This is far from a comprehensive tutorial. |
Setting Up tgtd As A SAN
Note that this is hosted on a machine outside of the cluster with the IP address of 10.255.0.222 and is exporting a storage device found at /dev/mmcblk0. A proper SAN device should be used in production, of course.
On the SAN server:
yum install scsi-target-utils
vim /etc/tgt/conf.d/sanlock.conf
<target iqn.2012-10.ca.alteeve:an-cluster-01.sanlock01>
direct-store /dev/mmcblk0
vendor_id Alteeve
</target>
systemctl start tgtd.service
systemctl status tgtd.service
tgtd.service - tgtd iSCSI target daemon
Loaded: loaded (/usr/lib/systemd/system/tgtd.service; disabled)
Active: active (running) since Thu, 11 Oct 2012 17:22:20 -0400; 10min ago
Process: 13552 ExecStop=/usr/sbin/tgtadm --op delete --mode system (code=exited, status=0/SUCCESS)
Process: 13548 ExecStop=/usr/sbin/tgt-admin --update ALL -c /dev/null (code=exited, status=0/SUCCESS)
Process: 13546 ExecStop=/usr/sbin/tgtadm --op update --mode sys --name State -v offline (code=exited, status=0/SUCCESS)
Process: 13622 ExecStartPost=/usr/sbin/tgtadm --op update --mode sys --name State -v ready (code=exited, status=0/SUCCESS)
Process: 13589 ExecStartPost=/usr/sbin/tgt-admin -e -c $TGTD_CONFIG (code=exited, status=0/SUCCESS)
Process: 13587 ExecStartPost=/usr/sbin/tgtadm --op update --mode sys --name State -v offline (code=exited, status=0/SUCCESS)
Main PID: 13586 (tgtd)
CGroup: name=systemd:/system/tgtd.service
└ 13586 /usr/sbin/tgtd -f
On the cluster nodes:
Make sure they can see the SAN;
iscsiadm -m discovery -t sendtargets -p 10.255.0.222
10.255.0.222:3260,1 iqn.2012-10.ca.alteeve:an-cluster-01.sanlock01
Then connect to the LUN;
iscsiadm --mode node --portal 10.255.0.222 --target iqn.2012-10.ca.alteeve:an-cluster-01.sanlock01 --login
Logging in to [iface: default, target: iqn.2012-10.ca.alteeve:an-cluster-01.sanlock01, portal: 10.255.0.222,3260] (multiple)
Login to [iface: default, target: iqn.2012-10.ca.alteeve:an-cluster-01.sanlock01, portal: 10.255.0.222,3260] successful.
Looks good. Confirm with fdisk;
fdisk -l
<snip>
Disk /dev/sdb: 125 MB, 125960192 bytes
4 heads, 61 sectors/track, 1008 cylinders, total 246016 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/sdb doesn't contain a valid partition table
Done!
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