Re: Problems with virtual disks in DomU

[Stephen Childs <Stephen.Childs@cs.tcd.ie>]

 >>If I export /dev/sdb to domain U as /dev/sdb read-write (i.e. disk = [
 >>'phy:sdb,sdb,w' ]), then DomU doesn't seem to see the disk at all; I get the
 >>following error:
 >>
 >>Initialising Xen virtual block device
 >>Partition check:
 >>  sdb:<6>Timeout connecting block device driver!

Having enabled some more debugging I get:

Partition check:
  sdb:<1>Entered do_blkif_request
do_blkif_request c11ac980: cmd 0, sec 0, (2/8) bh:c11a91e0
Timeout connecting block device driver!

 > This suggests that xend hasn't created the appropriate object for
 > configuring your block device.
 >
 > Seeing the messages coming out of xend would be very interesting,
 > as would enabling the debug flags in blkback/common.h (messages
 > will come out on the dom 0 console; you can capture them with
 > 'dmesg')

debug info:

(file=control.c, line=13) Received blkif backend message, subtype=0
(file=interface.c, line=107) Successfully created blkif
(file=control.c, line=13) Received blkif backend message, subtype=4
(file=vbd.c, line=74) Successful creation of vdev=0810 (dom=1)
(file=control.c, line=13) Received blkif backend message, subtype=6
(file=vbd.c, line=190) vbd_grow: requested_len 286749480 actual_len 286749480
(file=vbd.c, line=198) Successful grow of vdev=0810 (dom=1)
device vif1.0 entered promiscuous mode
(file=control.c, line=13) Received blkif backend message, subtype=2


xend o/p:

Using config file "/root/xen/xen2_domain_config".
config: (vm (name Xen1) (memory 64) (image (linux (kernel 
/boot/vmlinuz-2.4.27-xenU) (ip 192.168.0.144:1.2.3.4:192.168.0.254:::eth0:) 
(root '/dev/sdb1 ro') (args ' 4'))) (device (vbd (uname phy:sdb) (dev sdb) 
(mode w))) (device (vif (mac aa:00:00:75:fa:ba))))
[xend] DEBUG (XendDomainInfo:726) init_domain> Created domain=2 name=Xen1 
memory=64
[xend] INFO (console:93) Created console id=12 domain=2 port=9602
VIRTUAL MEMORY ARRANGEMENT:
  Loaded kernel: c0100000->c02cc24c
  Init. ramdisk: c02cd000->c02cd000
  Phys-Mach map: c02cd000->c02dd000
  Page tables:   c02dd000->c02df000
  Start info:    c02df000->c02e0000
  Boot stack:    c02e0000->c02e1000
  TOTAL:         c0000000->c0400000
  ENTRY ADDRESS: c0100000
[xend] DEBUG (blkif:52) Connecting blkif <BlkifBackendController 2 0>
CtrlMsgRcvr>writeRequest> message: type= blkif_be_create_t 1:0 id=15
payload= {'status': 1852731203, 'blkif_handle': 0, 'domid': 2}
EVENT> xend.console.create [12, 2, 9602]
responseReceived> message: type= blkif_be_create_t 1:0 id=15
payload= {'status': 0, 'blkif_handle': 0, 'domid': 2}
respond_be_create> {'status': 0, 'blkif_handle': 0, 'domid': 2}
[xend] DEBUG (XendDomainInfo:1083) Creating vbd dom=2 uname=phy:sdb dev=sdb
[xend] DEBUG (blkif:52) Connecting blkif <BlkifBackendController 2 0>
CtrlMsgRcvr>writeRequest> message: type= blkif_be_vbd_create_t 1:4 id=16
payload= {'status': 1734831948, 'blkif_handle': 0, 'readonly': 0, 'vdevice': 
2064, 'domid': 2}
[xend] DEBUG (XendDomainInfo:1057) Creating vif dom=2 vif=0 
mac=aa:00:00:75:fa:ba
attach>
CtrlMsgRcvr>writeRequest> message: type= netif_be_create_t 3:0 id=17
payload= {'status': 32, 'netif_handle': 0, 'domid': 2}
responseReceived> message: type= blkif_be_vbd_create_t 1:4 id=16
payload= {'status': 0, 'blkif_handle': 0, 'readonly': 0, 'vdevice': 2064, 
'domid': 2}
CtrlMsgRcvr>writeRequest> message: type= blkif_be_vbd_grow_t 1:6 id=18
payload= {'status': 544173600, 'blkif_handle': 0, 'extent.device': 2064, 
'extent.sector_start': 0L, 'vdevice': 2064, 'domid': 2, 
'extent.sector_length': 9223372036854775808L}
responseReceived> message: type= netif_be_create_t 3:0 id=17
payload= {'status': 0, 'netif_handle': 0, 'domid': 2}
respond_be_create> {'status': 0, 'netif_handle': 0, 'domid': 2}
vif-bridge up vif=vif2.0 domain=Xen1 mac=aa:00:00:75:fa:ba bridge=xen-br0
responseReceived> message: type= blkif_be_vbd_grow_t 1:6 id=18
payload= {'status': 0, 'blkif_handle': 0, 'extent.device': 2064, 
'extent.sector_start': 0L, 'vdevice': 2064, 'domid': 2, 
'extent.sector_length': 9223372036854775808L}
EVENT> xend.domain.created ['Xen1', '2']
EVENT> xend.domain.unpause ['Xen1', '2']
Started domain Xen1, console on port 9602
requestReceived> message: type= blkif_fe_driver_status_changed_t 2:32 id=255
payload= {'status': 1}
recv_fe_driver_status_changed> {'status': 1}
CtrlMsgRcvr>writeRequest> message: type= blkif_fe_interface_status_changed_t 
2:0 id=19
payload= {'status': 1, 'handle': 0, 'evtchn': 0}
responseReceived> message: type= blkif_fe_interface_status_changed_t 2:0 id=19
payload= {'status': 1, 'handle': 0, 'evtchn': 0}
responseReceived> No handler: Message type 
blkif_fe_interface_status_changed_t 2:0 
<xen.xend.server.blkif.BlkifController instance at 0x84def3c>
requestReceived> message: type= blkif_fe_interface_connect_t 2:33 id=255
payload= {'shmem_frame': 61677, 'handle': 0}
[xend] DEBUG (blkif:100) Connecting blkif to event channel 
<BlkifBackendController 2 0> ports=14:4
CtrlMsgRcvr>writeRequest> message: type= blkif_be_connect_t 1:2 id=20
payload= {'status': 1851880563, 'blkif_handle': 0, 'evtchn': 14, 'domid': 2, 
'shmem_frame': 61677}
responseReceived> message: type= blkif_be_connect_t 1:2 id=20
payload= {'status': 0, 'blkif_handle': 0, 'evtchn': 14, 'domid': 2, 
'shmem_frame': 61677}
respond_be_connect> <BlkifBackendController 2 0> {'status': 0, 
'blkif_handle': 0, 'evtchn': 14, 'domid': 2, 'shmem_frame': 61677}
CtrlMsgRcvr>writeRequest> message: type= blkif_fe_interface_status_changed_t 
2:0 id=21
payload= {'status': 2, 'handle': 0, 'evtchn': 4}
[xend] INFO (console:42) Console connected 12 127.0.0.1 1044
EVENT> xend.console.connect [12, '127.0.0.1', 1044]
requestReceived> message: type= netif_fe_driver_status_changed_t 4:32 id=255
payload= {'status': 1, 'nr_interfaces': 0}
CtrlMsgRcvr>writeRequest> message: type= netif_fe_driver_status_changed_t 
4:32 id=22
payload= {'status': 1, 'nr_interfaces': 1}
CtrlMsgRcvr>writeRequest> message: type= netif_fe_interface_status_changed_t 
4:0 id=23
payload= {'status': 1, 'mac[1]': 0, 'mac[0]': 170, 'handle': 0, 'mac[2]': 0, 
'mac[3]': 117, 'mac[5]': 186, 'evtchn': 0, 'mac[4]': 250}

 > Also, at the point where it's failed trying to fsck, trying doing
 > an '/sbin/sfdisk -s /dev/sdb1'.

It seems to report the correct size for the partition.

Stephen



-------------------------------------------------------
SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media
100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33
Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift.
http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285