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xen-devel
Re: [Xen-devel] A dumb question
> I haven't been able to try the "virtual disk" stuff as I haven't a
> spare partition on my test machine. I'll make one free if you're
> still having problems ;-)
With the 3 lines hacked out of xenctl, I've successfully
"formatted" a partition to contain virtual disks, created a
virtual disk, attached it as a "virtual block device" to domain0,
made a file system on it, and even mounted it.
Amazingly, the code hasn't rotted! (other than the java goop)
The log is attached, with comments. The UI for the tools isn't exactly
intuitive. The web-based interface was pretty cool until it
rotted.
Cheers,
Ian
iap10 > mkdir /var/lib/xen
#we need a directory in which the vdstate.xml file will be
#created. This keeps track of which chunks of disk space are used
#by which virtual disks.
iap10 > xenctl partitions add -psda15 -f
warning: state file not found [/var/lib/xen/vdstate.xml]
Added partition sda15
#'format' /dev/sda15 to allow it to hold virtual disks. The '-f'
#option must be given as the type field in the partition table is
#not set to some magic value I can't remember.
iap10 > ll /var/lib/xen/vdstate.xml
-rw-rw-r-- 1 root user 2373 Oct 10 17:36 /var/lib/xen/vdstate.xml
# The vdstate file has been created and initialised with the
# 'chunks' from sda15. I think the default chunk size is 128MB.
iap10 > xenctl partitions list
maj:min blocks start sect num sects name
1 3:0 439780 0 879560 hda
2 8:0 143358272 0 286716544 sda
3 8:1 56196 63 112392 sda1
4 8:2 8418060 112455 16836120 sda2
5 8:3 8418060 16948575 16836120 sda3
6 8:4 1 33784695 2 sda4
7 8:5 8418028 33784758 16836057 sda5
8 8:6 8418028 50620878 16836057 sda6
9 8:7 8418028 67456998 16836057 sda7
10 8:8 8418028 84293118 16836057 sda8
11 8:9 4208998 101129238 8417997 sda9
12 8:10 4208998 109547298 8417997 sda10
13 8:11 4208998 117965358 8417997 sda11
14 8:12 2104483 126383418 4208967 sda12
15 8:13 2104483 130592448 4208967 sda13
16 8:14 2104483 134801478 4208967 sda14
[ 17 8:15 2104483 139010508 4208967 sda15 ]
# The square brackets indicate that this is a virtual disk
# partition. Multiple partitions on a disk can contain virtual
# disks.
iap10 > xenctl vd create -nMyFirstVD -s100000
Virtual Disk created with key: 6838196657
# Create a 100MB partition. This gets rounded up to 128MB because
# of our large chunk size.
iap10 > xenctl vd show
key expiry name size
6838196657 MyFirstVD 128M
# List all virtual disks, along with their keys. This VD is
# permanent as it doesn't have an expiry time. (The disk space
# belonging to expired VDs is reclaimed in a
# least-recently-expired-first fashion, but VDs that haven't been
# reclaimed can be 'refreshed' to revive them.)
iap10 > xenctl vbd create -k6838196657 -v0 -n0 -w
Created virtual block device 0 for domain 0
# attach the first virtual block device of domain0 to our virtual
# disk.
iap10 > mkfs -t ext3 /dev/xvda
# make a file system
iap10 > mount /dev/xvda /mnt
# it all works!
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