Re: [Qemu-devel] [PATCH v2 00/15] SCSI s/g + SCSI migration + virtio-scsi

[Paolo Bonzini <pbonzini@redhat.com>]

On 01/19/2012 04:53 PM, Paolo Bonzini wrote:
>> I found a problem that a virtio-scsi disk gets offline during mkfs.
>> The scsi disk is of 100G or bigger, and the corresponding image
>> is a freshly created qcow2 image. If the disk is small enough, or
>> not freshly created, the problem doesn't appear.
>
> Hi Hu,
>
> I cannot reproduce this with a 100G qcow2 image (created with "qemu-img
> create scsi.qcow2 100G" just before launching the host), with a
> partition starting at sector 2048 and extending to the end of the disk.
>   mkfs (ext4) takes less than 1 minute and extends the qcow2 file to a
> little less than 2 gigs.
>
> Can you send the partition table ("file -s /dev/sda" should be enough)
> and any output you get from the dmesg?

I cannot reproduce this even with a 3T qcow2 image.  mkfs takes 30 
minutes and creates a 50G image.

What kernel driver are you using?

Paolo