Daniele B.
Cadet
- Joined
- Nov 12, 2015
- Messages
- 2
Hi everyone.
I'm trying to figure out a sane configuration for a FreeNAS box, acting as iSCSI server for VMs running on multiple hosts.
I read very carefully the FreeNAS documentation, many posts on this forum and other places over the net.
One thing I cannot understand is this recommendation on the FreeNAS docs:
The documentation doesn't provide a clear explanation why targets should be associated to extents 1:1.
For me it would make sense to aggregate several extents on a few iSCSI targets, because it is simpler to see new LUNs when I add them as extents on FreeNAS, without having to rediscover iSCSI targets from every host running VMs (Linux kvm based hosts, not ESXi).
I found evidence of many virtualization environments running with multiple LUNs on a single iSCSI target, so my question is: why FreeNAS recommends to avoid multiple LUNs (iSCSI extents) exposed on the same iSCSI target? What kind of trouble could arise in case of doing so?
I'm trying to figure out a sane configuration for a FreeNAS box, acting as iSCSI server for VMs running on multiple hosts.
I read very carefully the FreeNAS documentation, many posts on this forum and other places over the net.
One thing I cannot understand is this recommendation on the FreeNAS docs:
Chapter 10.5.7, Sharing > Target/Extents
"It is recommended to always associate extents to targets in a 1:1 manner, even though the GUI will allow multiple extents to be associated with the same target."
"It is recommended to always associate extents to targets in a 1:1 manner, even though the GUI will allow multiple extents to be associated with the same target."
The documentation doesn't provide a clear explanation why targets should be associated to extents 1:1.
For me it would make sense to aggregate several extents on a few iSCSI targets, because it is simpler to see new LUNs when I add them as extents on FreeNAS, without having to rediscover iSCSI targets from every host running VMs (Linux kvm based hosts, not ESXi).
I found evidence of many virtualization environments running with multiple LUNs on a single iSCSI target, so my question is: why FreeNAS recommends to avoid multiple LUNs (iSCSI extents) exposed on the same iSCSI target? What kind of trouble could arise in case of doing so?