Re: [Xen-users] Extending a disk attached by iscsi

["Austin S. Hemmelgarn" <ahferroin7@xxxxxxxxx>]

On 2016-11-28 17:26, Lang, Adam wrote:
> Hello,
>
>
>
> I inherited an old Xen environment with one VM remaining that we need to
> use for the foreseeable future.
>
> xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p
>
>
>
> A disk for the VM is mapped via iscsi on a Dell Powervault for 2
> terrabytes.  I increased the virtual capacity of the mapping on the
> powervault to over 3 terrabytes, but the actual VM still only recognizes
> 2 TB.
>
>
>
> I can’t seem to find the appropriate way to have Xen recognize the
> larger capacity and the only Xen/iSCSI docs I see online are about newer
> Citrix oriented platforms.
>
>
>
> If anyone can share ideas or where I can look, it would be appreciated.
This really depends on how the disk is actually attached.  If you're 
using regular Xen then Xen itself is not handling the iSCSI stuff 
(XenServer does though, which is why you see the Citrix stuff when 
searching).  Assuming that the guest isn't mapping the device itself 
(which may be more efficient in some cases), then:
* For a HVM domain, it's the device-model (QEMU) doing the handling, so 
you'd need to look at that.
* For a PV domain, it's handled by the Domain-0 OS (so for this, check 
the docs for whatever you're using for your Domain-0).
In either case, your guest OS may be limiting things too (2TiB - 1 byte 
is a common storage stack limitation because that happens to be roughly 
2^48 (and many older systems only support 48-bit LBA)).  If the VM is 
older than a few years, this is actually what I would suspect first, not 
some other configuration issue.
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