Re: [Xen-users] iscsi initiator on PV DomU problem

[Christopher Chen <muffaleta@xxxxxxxxx>]

On Mar 9, 2009, at 6:30, "Fajar A. Nugraha" <fajar@xxxxxxxxx> wrote:

> On Mon, Mar 9, 2009 at 7:56 PM, Longina Przybyszewska
> <longina@xxxxxxxxxxxx> wrote:
> > I have got 300gb iscsi target ( residence on SAN ) which should be  
> > directly
> > bound to domU.
> > (DomU: PV Ubuntu Hardy Linux 2.6.24-19-xen, Dom0: UbuntuHardy Linux
> > 2.6-24-22-xen).
> First of all, I believe you'd get better performance if the initiator
> is on dom0 instead of domU.
>
> > It comes up as 500gb block device!
> > ========
> > attempt to access beyond end of device
> > sda: rw=0, want=976639545, limit=629147647
> > ========
> It means domU correctly recognize the block device as 629147647
> sectors of 512-bytes long (300GB), but it was asked to get sector
> number 976639545.
>
> > cfdisk /dev/sda : "Fatal Error: Bad primary partition 0: Partition  
> > ends
> > after end-of-disk"
> >
> > cfdisk /dev/sda1 : "Disk Driver /dev/sda1, size 500,0 Gb free space"
> > Then I kan make primary  paritions assigned name /dev/sda1p1, /dev/ 
> > sda1p2.
> Probably because there's already a partition table on that block
> device, and it's messed up (maybe because the block the device was
> used previously, and then shrinked).
>
> What does "cat /proc/partitions" and "fdisk -l /dev/sda" shows?
>
> If it is indeed messed up partition table, you can use fdisk's extra
> functionality to change the number of heads, sectors/tracks, or
> cylinders.
>
> If it's a blank target with MBR partition, zeroing the first 512-byte
> of the disk (with dd or whatever) should erase existing partition
> table and let fdisk work out reasonable parameters. If it's GPT
> parition though things can get a little more complicated :)
I've had success with parted, using it to write a msdos label, then  
zeroing it out. It appears to be smart enough to seek out and destroy  
rogue gpt superblocks.
> Regards,
>
> Fajar
>
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