How to mount an RPN SAN volume on Linux
You can mount RPN SAN volumes on Linux machines using Open-iSCSI.
- You have an account and are logged into the Dedibox Console
- You have a Dedibox dedicated server
- You have an RPN SAN
How to install and configure Open-iSCSI
Update the apt package cache and install Open-iSCSI:apt update && apt install -y open-iscsi
Open the file
/etc/iscsi/iscsid.confin a text editor:nano /etc/iscsi/iscsid.conf
Add the following configuration lines:node.conn.timeo.noop_out_interval = 0node.conn.timeo.noop_out_timeout = 0node.session.timeo.replacement_timeout = 86400
The purpose of this modification is to prevent your file system from becoming read-only if the link is interrupted for more than two minutes (by default) between your server and the storage server.
Adjust the setting for automatic reconnection of targetsnode.startup = automatic
node.conn.iscsi.HeaderDigest = CRC32C,Nonenode.conn.iscsi.DataDigest = CRC32C,None
- Change the following settings to benefit from the data integrity check, if available:
How to discover and connect to targets
Run the following command to obtain the list of available targets:iscsiadm -m discovery -t sendtargets -p SAN_SERVERNote:
SAN_SERVERaddress is displayed in your Dedibox console.
The target name should look like the following example:X.X.X.X:3260,1 iqn.2013-01.net.online:XXXXXXXXXXX
Connect to the target by typing the following command:iscsiadm -m node -T iqn.2013-01.net.online:XXXXXXXXXXX --login
dmesgto see the kernel logs. You should see some lines like in the following examplescsi25 : iSCSI Initiator over TCP/IPscsi 25:0:0:0: Direct-Access IET VIRTUAL-DISK 0 PQ: 0 ANSI: 4sd 25:0:0:0: Attached scsi generic sg4 type 0sd 25:0:0:0: [sdd] 2147483648 512-byte logical blocks: (1.09 TB/1.00 TiB)sd 25:0:0:0: [sdd] Write Protect is offsd 25:0:0:0: [sdd] Mode Sense: 77 00 00 08sd 25:0:0:0: [sdd] Write cache: disabled, read cache: enabled, doesn't support DPO or FUAsdd: sdd1sd 25:0:0:0: [sdd] Attached SCSI disk
In the example above, the disk detected is
sdd, available at
The assigned device name may be different, depending on your configuration.
You can now use your SAN disk like you would any other disk.
Important recommendations for use
As seen in the example above, the disk is available as
/dev/sdd. It is not guaranteed that at the next reboot the same drive letter will be used, especially if you add other targets, or if your hardware configuration changes. It is therefore recommended not to use the names
/dev/sdX in your configuration files.
How to address devices when using LVM
LVM automatically uses UUIDs to recognize the partitions it uses. In this case, no problems should arise.
How to address devices when using direct disk formatting
This method is not recommended, because aggregates several RPN SAN storage spaces, and does not allow you to make changes afterwards.
If you format the device or one of its partitions directly, use the link created by the system in
/dev/disk/by-uuid/ or the fstab notation
UUID=XXX-XXX... for addressing purposes.
How to address devices directly by their UUID
If (unlike LVM) your application does not support the auto-detection of the partitions associated with it via the UUID, it is recommended to use the link in