iSCSI

[ale123]

Hi all.
One of our technician told me that with an iSCSI san, every virtual machine on a host must be connected directly to the iscsi san.

For example, if my san will support a maximum of 16 hosts, i can have just only 16 virtual machine connected to it.

With a fiber san, only the host is connected to the san, and virtual machine over the host will communicate thrugh the host. So I can attach up to 16 host (with 10 virtual machine over each one) instead 16 virtual machine.

Is right? Is not possibile with iSCSI to connect just only the host instead the single virtual machine?

thank you and sorry for my bad english.

 

[tom]

Hi all.
One of our technician told me that with an iSCSI san, every virtual machine on a host must be connected directly to the iscsi san.

For example, if my san will support a maximum of 16 hosts, i can have just only 16 virtual machine connected to it.

With a fiber san, only the host is connected to the san, and virtual machine over the host will communicate thrugh the host. So I can attach up to 16 host (with 10 virtual machine over each one) instead 16 virtual machine.

Is right? Is not possibile with iSCSI to connect just only the host instead the single virtual machine?

thank you and sorry for my bad english.

The current Proxmox VE does not support ISCSI nor FC - this is scheduled for 2.0 - see roadmap.

But it will be possible to mount a ISCSI target on Promox VE and this "iSCSI data store" can be used for multiple virtual machines. (So I do not see this limitation your technician is talking about)

 

[ale123]

So you think that I can access to the iSCSI san via host server and then I can create 10-20 LVM volumes that are connected to each VM via single iSCSI connection?

If yes, an iSCSI SAN with support to 16 host can handle 160 VM (10 VM for each host)

 

[tom]

So you think that I can access to the iSCSI san via host server and then I can create 10-20 LVM volumes that are connected to each VM via single iSCSI connection?

If yes, an iSCSI SAN with support to 16 host can handle 160 VM (10 VM for each host)

yes.

but 160 servers accessing one storage over the network would not be the fastest solution, but possible. FC would give more performance. or 10gbit ethernet.

 

[ale123]

It was just an example.
By the way, FC are very expensive....

I'll prefer a SAS DAS (usually 12gbit) connected to a couple of SAN gateway. On the gateway I can install two or three 4gbit ethernet port in teaming/bonding. 12gbit in iSCSI for each server....

 

[Michael]

Yes, is possible. If you cheek in the StarWind Software were they full it explained how, Im been using it now for 3 months with great results extend my hard drive over my virtual machine.
http://www.starwindsoftware.com/starwind-enterprise-server
http://www.starwindsoftware.com/technical-papers