Re: Unstableness in grant table block drivers

[Kip Macy <kip.macy@gmail.com>]

If I do

3 VMs x 40 iSCSI LUNs/VM x foreach (lun) dd if=/dev/zero of=/dev/xbd<n> bs=64k

iscsi ops will stop going across the wire in  2 - 3 minutes. Access to
the LUNs from DOM0 still works. I haven't had a chance to try a
smaller configuration. This is all scripted so it only takes a minute
to set up, but I'm busy trying to get FreeBSD to run (and not have
DOM0 lockup) on a recent -unstable.

      -Kip



On 4/13/05, Anthony Liguori <aliguori@us.ibm.com> wrote:
> Kip Macy wrote:
> 
> >I think it is safe to say that the blkback/blkfront still have some
> >serious bugs to be fixed even in the absences of grant tables.
> >
> >
> How many is a lot of VBDs?  I've done quite a bit of testing of the
> devices (with Xend and with VM-Tools) and I've found the block drivers
> to be very reliable.  I've not gone much higher than 3 or 4 VBDs for
> each domain though.
> 
> Regards,
> Anthony Liguoris
>