ISCSI

Preliminary (manual) suport for iSCSI in Amahi 6.

From this forums post.

WARNING: this page may have some items missing in the setup

Server side

Set up an iSCSI server on the Amahi box:

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​root@host# yum install scsi-target-utils​

Set up 1 Logical Volume (LV) that will be exported as an iSCSI LUN. The below output shows my LV created for time machine (hence the name lvtime).

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​root@host# lvs | grep time lvtime vg00 -wi-ao 500.00g​

Export the LV: add it to /etc/tgt/targets.conf (note that there's a convention on how to export these!)

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​<target iqn.2010-08.local.bonabo:galileo.lun1> backing-store /dev/vg00/lvtime </target>​

Start the iSCSI target daemon and make sure it starts at boot time:

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​root@host# service tgtd start; chkconfig tgtd on​

Check the exported LUN(s):

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​root@host# tgt-admin -s​

Client side

quick how-to for connecting to iSCSI storage (implies that iscsi-initiator-utils are installed!): scan for new LUNs:

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​root@host# iscsiadm -m discovery -t sendtargets -p <NAS IP>​

login and make the connection persistent

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​root@host# iscsiadm -m node -T iqn.2012-02.<domain>.<your>:<LUNname> -p <NAS IP> -l​

you should see a new device, you can partition it now

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​root@host# fdisk /dev/<new device> root@host# partprobe /dev/<new device>​

Create LVM stuff if you want to, otherwise create the filesystem as you would normally do

The name convention for iSCSI LUNs is usually as follows but a vendor can change it at will, it's a convention not a requirement.

Below how the name comes together, the parts are connected by dots, the lun name is separated by a colon.

fixed data: iqn -> iqn
date the LUN was created: year-month -> 2012-02
your domainname inverted: domain.your -> com.home
the LUN name: this is what the vendor usually provides -> lun1

so that would make the following target: iqn.2012-02.com.home:lun1

For the Apple iMac I installed globalSAN iSCSI Initiator for OS X by Studio Network Solutions (free community supported) iSCSI client for OS X) on the Mac.

I configured it to "see" the iSCSI lun (just type in the iqn IIRC); since it's presented to the OS as a normal disk you need to partition the drive first (it's a blank disk as far as the Mac is concerned). Then configure Time Machine to use that disk and you're done!