[CentOS-virt] KVM, virsh attach-disk problems
listmember at greenspot.fi
Sun Apr 24 01:55:08 EDT 2011
Maybe my question is difficult, though it should not be. "Virsh
attach-disk" seems to be poorly documented.
One correction: this was definitely not "my last problem" - it was only
the latest. :-)
Now I continue configuring my kvm system with the "traditional" way -
one filesystem per guest.
On 23.4.2011 17.58, Jussi Hirvi wrote:
> Greetings, list!
> I hope you forgive cross-posting - I only now found this list.
> I am in the process of configuring a KVM stack of about 8 vms. Mostly I
> am concerned about performance, as there will be a lot of I/O.
> My last problem is this: I try to add a fresh, unformatted disk
> partition to a KVM guest. I follow the directions given here:
> First I check that the module acpiphp is present on the guest. It is.
> On the host I write:
> virsh attach-disk test1 /dev/sdb1 sda --driver tap --mode shareable
> - test1 is my guest domain
> - /dev/sdb1 is the name of the unformatted partition on the host
> - sda is what it is supposed to be called on the guest (the name is
> unused on the guest)
> - the example in RHEL Virtualization guide says "--mode readonly". This
> does not sound right for a hard disk; hence I try "--mode shareable";
> the error (see below) however is the same, whichever I use
> Now, the command above produces this error. I find no google results
> with this error text. Can someone tell, what causes the error?
> > > error: Failed to attach disk error: operation failed: adding scsi
> > > disk controller failed: type scsi not a hotpluggable PCI device.
> > > failed to add if=scsi
> I found a post (2009, on fedora-virt list), which is relevant:
> Otherwise, I have found almost nothing!
> BTW, I can attach a disk to the KVM guest, using a virtio driver:
> > > [root at 113 info]# virsh attach-disk test1 /dev/sdd1 vdb
> > > --driver virtio --mode shareable
> > Disk attached successfully
> I have not seen any mention anywhere about using virtio drivers like
> this. And the problem with this is that the new disk does not survive
> guest reboot. At guest startup virsh complains about the virtio drivers.
> - Jussi
Jussi Hirvi * Green Spot
Suvilahdenkatu 1 B 78 * 00500 Helsinki * Finland
Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms)
jussi.hirvi at greenspot.fi * http://www.greenspot.fi
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