[Bug 893450] Re: libvirt fails to start correctly because LVM is not ready

Tue Jan 10 20:40:03 UTC 2012

Ok, I've added seagate disks, manually created partitions (aligned to
1mb), added the new discs to the raid, remove the wd discs. The raid is
now over two seagate disks, and the performance is still crap.

# hdparm -i /dev/sda
 Model=ST2000DL003-9VT166, FwRev=CC32, SerialNo=6YD0RYED
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
 BuffType=unknown, BuffSize=unknown, MaxMultSect=16, MultSect=16
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=3907029168

I've tryied to make the partition aligned to 1mb, maybe I made the
partitions wrong.. These are the partitions on /dev/sda:

# sfdisk -s -d /dev/sda
1953514584
# partition table of /dev/sda
unit: sectors

/dev/sda1 : start=     2048, size= 19531776, Id=fd
/dev/sda2 : start= 19533824, size=  9762816, Id=83
/dev/sda3 : start= 29296640, size=3877730304, Id=fd
/dev/sda4 : start=        0, size=        0, Id= 0

Please, tell me if the partitions aren't aligned. I think I done this
right, multiples of 2048 (1mb).

If the partitions are right, the problem aren't the disks, neither raid,
lvm nor the fs, since I've tested with dd over /dev/sda2 (plain
partition, no raid, no lvm, no filesystem):

# dd if=/dev/zero of=/dev/sda2 count=1000 oflag=dsync bs=16384
16384000 bytes (16 MB) copied, 12.5848 s, 1.3 MB/s

# dd if=/dev/zero of=/dev/sda2 count=1000 oflag=dsync bs=16384
16384000 bytes (16 MB) copied, 14.4387 s, 1.1 MB/s

With raid, lvm and ext4, the performance is:

# dd if=/dev/zero of=zeros count=1000 oflag=dsync bs=512
512000 bytes (512 kB) copied, 19.4532 s, 26.3 kB/s

# dd if=/dev/zero of=zeros count=1000 oflag=dsync bs=1024
1024000 bytes (1.0 MB) copied, 22.373 s, 45.8 kB/s

# dd if=/dev/zero of=zeros count=1000 oflag=dsync bs=2048
2048000 bytes (2.0 MB) copied, 28.7906 s, 71.1 kB/s

# dd if=/dev/zero of=zeros count=1000 oflag=dsync bs=4096
4096000 bytes (4.1 MB) copied, 68.0617 s, 60.2 kB/s

# dd if=/dev/zero of=zeros count=1000 oflag=dsync bs=8192
8192000 bytes (8.2 MB) copied, 61.7608 s, 133 kB/s

# dd if=/dev/zero of=zeros count=1000 oflag=dsync bs=16384
16384000 bytes (16 MB) copied, 67.1279 s, 244 kB/s

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to udev in Ubuntu.
https://bugs.launchpad.net/bugs/893450

Title:
  libvirt fails to start correctly because LVM is not ready

Status in “libvirt” package in Ubuntu:
  Incomplete
Status in “udev” package in Ubuntu:
  Incomplete

Bug description:
  Some times, one of the KVM guest failed to start. I've 3 guest, two
  started OK and one failed (the two times the same has failed). After
  rebooting the host two times, the KVM guest started OK, but this is a
  server and found too risky this behavior. The host server is running
  "Ubuntu 11.04 Server 64bits" and libvirt 0.8.8-1ubuntu6.5

  The two times that failed, I've found this on syslog:

  error : virSecurityDACSetOwnership:125 : unable to set user and group to '105:115' on '/dev/vg_default/lv_robot-pv0': No such file or directory
  kernel: [  200.354543] type=1400 audit(1321932141.068:11): apparmor="DENIED" operation="open" parent=2539 profile="/usr/lib/libvirt/virt-aa-helper" name="/dev/dm-7" pid=2638 comm="virt-aa-helper" requested_mask="r" denied_mask="r" fsuid=0 ouid=105
  kernel: [  200.692255] type=1400 audit(1321932141.408:12): apparmor="STATUS" operation="profile_load" name="libvirt-7262201f-566b-d0b1-16ec-0b404ccd5336" pid=2639 comm="apparmor_parser"
  libvirtd: 00:22:21.424: 2539: error : virSecurityDACRestoreSecurityFileLabel:143 : cannot resolve symlink /dev/vg_default/lv_robot-pv0: No such file or directory
  libvirtd: 00:22:21.707: 2539: error : qemuAutostartDomain:275 : Failed to autostart VM 'robot': unable to set user and group to '105:115' on '/dev/vg_default/lv_robot-pv0': No such file or directory

  The LVM device is on a software raid. Maybe this is taking too long to
  come up?

  FYI, running "aa-status" (after the reboots) gives me:
  apparmor module is loaded.
  9 profiles are loaded.
  9 profiles are in enforce mode.
     /sbin/dhclient
     /usr/lib/NetworkManager/nm-dhcp-client.action
     /usr/lib/connman/scripts/dhclient-script
     /usr/lib/libvirt/virt-aa-helper
     /usr/sbin/libvirtd
     /usr/sbin/tcpdump
     libvirt-7262201f-566b-d0b1-16ec-0b404ccd5336
     libvirt-c032ea0a-8c62-7730-fb4d-e1bf60c15a31
     libvirt-f06ad419-f312-f002-444f-3e51f40d2291
  0 profiles are in complain mode.
  4 processes have profiles defined.
  4 processes are in enforce mode :
     /usr/sbin/libvirtd (2459) 
     libvirt-7262201f-566b-d0b1-16ec-0b404ccd5336 (2521) 
     libvirt-c032ea0a-8c62-7730-fb4d-e1bf60c15a31 (2551) 
     libvirt-f06ad419-f312-f002-444f-3e51f40d2291 (2582) 
  0 processes are in complain mode.
  0 processes are unconfined but have a profile defined.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/893450/+subscriptions