> I'm assuming that growing the backing-store will be transparent, say
> increasing a target from 500GB to 1TB.
Yes, if you were to set the 'volsize' property, that change would show up
in the target:
# iscsitadm list target -v
Target: pool/volumes/vol1
iSCSI Name: iqn.1986-03.com.sun:02:4db92521-f5dc-cde4-9cd5-a3f6f567220a
Alias: pool/volumes/vol1
...
Size: 100M
...
# zfs set volsize=1G pool/volumes/vol1
# iscsitadm list target -v
Target: pool/volumes/vol1
iSCSI Name: iqn.1986-03.com.sun:02:4db92521-f5dc-cde4-9cd5-a3f6f567220a
Alias: pool/volumes/vol1
...
Size: 1.0G
...
Look good? (Keep in mind you would probably want to change the reservation as
well in this case.)
Adam
On Wed, Nov 01, 2006 at 01:06:53AM -0800, Ben Rockwood wrote:
> Two very enthusiast thumbs up.
>
> I'm assuming that growing the backing-store will be transparent, say
> increasing a target from 500GB to 1TB.
>
> benr.
>
>
> Adam Leventhal wrote:
> >Rick McNeal and I have been working on building support for sharing ZVOLs
> >as iSCSI targets directly into ZFS. Below is the proposal I'll be
> >submitting to PSARC. Comments and suggestions are welcome.
> >
> >Adam
> >
> >---8<---
> >
> >iSCSI/ZFS Integration
> >
> >A. Overview
> >
> >The goal of this project is to couple ZFS with the iSCSI target in Solaris
> >specifically to make it as easy to create and export ZVOLs via iSCSI as it
> >is to create and export ZFS filesystems via NFS. We will add two new ZFS
> >properties to support this feature.
> >
> > shareiscsi
> >
> > Like the 'sharenfs' property, 'shareiscsi' indicates if a ZVOL should
> > be exported as an iSCSI target. The acceptable values for this
> > property
> > are 'on', 'off', and 'direct'. In the future, we may support other
> > target types (for example, 'tape'). The default is 'off'. This
> > property
> > may be set on filesystems, but has no direct effect; this is to allow
> > ZVOLs created under the ZFS hierarchy to inherit a default. For
> > example, an administrator may want ZVOLs to be shared by default, and
> > so set 'shareiscsi=on' for the pool.
> >
> > iscsioptions
> >
> > This property, which is hidden by default, is used by the iSCSI
> > target
> > daemon to store persistent information such as the IQN. The contents
> > are not intended for users or external consumers.
> >
> >
> >B. Examples
> >
> >iSCSI targets are simple to create with the zfs(1M) command:
> >
> ># zfs create -V 100M pool/volumes/v1
> ># zfs set shareiscsi=on pool/volumes/v1
> ># iscsitadm list target
> >Target: pool/volumes/v1
> > iSCSI Name: iqn.1986-03.com.sun:02:4db92521-f5dc-cde4-9cd5-a3f6f567220a
> > Connections: 0
> >
> >Renaming the ZVOL has the expected result for the iSCSI target:
> >
> ># zfs rename pool/volumes/v1 pool/volumes/stuff
> ># iscsitadm list target
> >Target: pool/volumes/stuff
> > iSCSI Name: iqn.1986-03.com.sun:02:4db92521-f5dc-cde4-9cd5-a3f6f567220a
> > Connections: 0
> >
> >Note that per the iSCSI specification (RFC3720), the iSCSI Name is
> >unchanged
> >after the ZVOL is renamed.
> >
> >Exporting a pool containing a shared ZVOL will cause the target to be
> >removed;
> >importing a pool containing a shared ZVOL will cause the target to be
> >shared:
> >
> ># zpool export pool
> ># iscsitadm list target
> ># zpool import pool
> ># iscsitadm list target
> >Target: pool/volumes/stuff
> > iSCSI Name: iqn.1986-03.com.sun:02:4db92521-f5dc-cde4-9cd5-a3f6f567220a
> > Connections: 0
> >
> >Note again that all configuration information is stored with the dataset.
> >As
> >with NFS shared filesystems, iSCSI targets imported on a different system
> >will be shared appropriately.
> >
> >---8<---
> >
> >
--
Adam Leventhal, Solaris Kernel Development http://blogs.sun.com/ahl
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