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Date:      Sun, 30 Jul 2017 13:19:27 +0100
From:      Kaya Saman <kayasaman@gmail.com>
To:        Jov <zhao6014@gmail.com>
Cc:        freebsd-fs <freebsd-fs@freebsd.org>
Subject:   Re: ZFS and ISCSI question
Message-ID:  <0f4905d2-6567-a83c-45f8-435c7c987d5b@gmail.com>
In-Reply-To: <CADyrUxMoqjyMj=uxweJJTm8gNuARxKm2qLtZWhP1cAGMCZ=cfA@mail.gmail.com>
References:  <fd4b620a-e1dc-157e-a914-a8d0192c1199@gmail.com> <CADyrUxMoqjyMj=uxweJJTm8gNuARxKm2qLtZWhP1cAGMCZ=cfA@mail.gmail.com>
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<snip>

You forgot to enter the zvol size - f -V argument. I'm surprised it was 
even created.

Eugene.
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Correct! :-)


# zfs create -V iscsi-tst/tank
bad volume size 'iscsi-tst/tank': bad numeric value 'iscsi-tst/tank


So that makes it: zfs create -V 900M iscsi-tst/tank


-------



<snip>

target iqn.2012-06.com.example:target

    0 {
         auth-group no-authentication
         portal-group pg0

         lun 0 {
             path iscsi-tst/tank

Does this path really exist? Mybe should be prefixed with /dev/zvol ?


I was thinking ZFS terms but the path has got to be /dev/zvol:

# ls /dev/zvol
iscsi-tst


so the /etc/ctl.conf file reads:

target iqn.2012-06.com.example:target0 {
     auth-group no-authentication
     portal-group pg0

     lun 0 {
         path /dev/zvol/iscsi-tst/tank
         size 900M
     }
}


Many Thanks for the responses!




I understand that iscsi works at the "block device" level but how would 
one go about using ZFS on the initiator?

The standard ZFS commands can be run:

zpool followed by zfs FS-set on the Initiator machine

however, it doesn't seem right to first create a ZFS pool on the Target 
system then create another one on the same pool on the Initiator.



Would zpool import/export work or does something else need to be done to 
get the Initiator to create a ZFS data set?

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