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

2012-03-20 Thread Launchpad Bug Tracker
[Expired for udev (Ubuntu) because there has been no activity for 60
days.]

** Changed in: udev (Ubuntu)
   Status: Incomplete => Expired

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

2012-03-20 Thread Launchpad Bug Tracker
[Expired for libvirt (Ubuntu) because there has been no activity for 60
days.]

** Changed in: libvirt (Ubuntu)
   Status: Incomplete => Expired

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  libvirt fails to start correctly because LVM is not ready

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

2012-01-20 Thread Peter Petrakis
The disk sector size and how it's managed really determine how well it will
perform under various access sizes. In your case remember, the disk sector
size is 4k, so we would hope that Linux is "doing the right thing" in coalescing
these 1k accesses into chunks which get the most out of your hard disks.

That's not our primary problem here, the primary problem here is LVM 
having trouble bringing all LVs online. These performance issues are
in addition to that. The LVM problem appears to have been addressed
by adding a root delay so that's that.

We have yet to pin down where any of them have come from. That this
problem appeared after an update is suspicious, yet iirc you've shown
that rolling kernels back and forth have no net impact on the symptoms.

If an update was really the root of all of this you should be able to
install natty to a separate set of disks, re-run these tests and see 
dramatically
different numbers for the 1K test runs.

We are now left with the actual configuration of your entire stack, the
loads generated by your VMs, and how they might be affecting your
IO subsystem.

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

2012-01-20 Thread Horacio
All the tests where ran at the bare metal level.
The results on comment 16 where ran over a ext4 over lvm over raid1.
The results on comment 17 where ran over a ext4 over a plain partition.

I don't know how bad are those numbers... Maybe it's normal that working
with 1k blocks kill's the disk performance?

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

2012-01-20 Thread Peter Petrakis
Are these ext4 test results done at the bare metal level or from the guest? 
With the
guests themselves, are they using the raw volume for  the image or do they 
exist as an
image file on the filesystem. If they're images files, then what fs type do 
they live on?
Thanks.

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

2012-01-20 Thread Horacio
The same tests, now on a ext4 filesystem over plain partition (no RAID)

- Record size 1k

Children see throughput for  2 initial writers  =  34.09 KB/sec
Avg throughput per process  =  17.04 KB/sec

Children see throughput for  2 rewriters=  25.68 KB/sec
Avg throughput per process  =  12.84 KB/sec

- Record size 8k

Children see throughput for  2 initial writers  = 195.30 KB/sec
Avg throughput per process  =  97.65 KB/sec

Children see throughput for  2 rewriters= 199.05 KB/sec
Avg throughput per process  =  99.52 KB/sec

- Record size 128k

Children see throughput for  2 initial writers  =3248.37 KB/sec
Avg throughput per process  =1624.19 KB/sec

Children see throughput for  2 rewriters=3197.46 KB/sec
Avg throughput per process  =1598.73 KB/sec

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

2012-01-20 Thread Horacio
And some iozone tests, with 2 child process, O_DIRECT and SYNC Mode
(full log on pastebin: http://pastebin.com/amTbjfdr).

All with:
O_DIRECT feature enabled
SYNC Mode. 
Output is in Kbytes/sec
Min process = 2 
Max process = 2 
Throughput test with 2 processes

- Record size 1k

Children see throughput for  2 initial writers  =  11.50 KB/sec
Avg throughput per process  =   5.75 KB/sec

Children see throughput for  2 rewriters=  12.45 KB/sec
Avg throughput per process  =   6.22 KB/sec

- Record size 8k

Children see throughput for  2 initial writers  = 100.18 KB/sec
Avg throughput per process  =  50.09 KB/sec

Children see throughput for  2 rewriters=  75.27 KB/sec
Avg throughput per process  =  37.64 KB/sec

- Record size 16k

Children see throughput for  2 initial writers  = 277.43 KB/sec
Avg throughput per process  = 138.71 KB/sec

Children see throughput for  2 rewriters= 224.98 KB/sec
Avg throughput per process  = 112.49 KB/sec

- Record size 32k

Children see throughput for  2 initial writers  = 398.72 KB/sec
Avg throughput per process  = 199.36 KB/sec

Children see throughput for  2 rewriters= 204.58 KB/sec
Avg throughput per process  = 102.29 KB/sec

- Record size 64k

Children see throughput for  2 initial writers  = 406.26 KB/sec
Avg throughput per process  = 203.13 KB/sec

Children see throughput for  2 rewriters= 447.78 KB/sec
Avg throughput per process  = 223.89 KB/sec

- Record size 128k

Children see throughput for  2 initial writers  =1711.68 KB/sec
Avg throughput per process  = 855.84 KB/sec

Children see throughput for  2 rewriters=1563.11 KB/sec
Avg throughput per process  = 781.56 KB/sec

- Record size 256k

Children see throughput for  2 initial writers  =3400.94 KB/sec
Avg throughput per process  =1700.47 KB/sec

Children see throughput for  2 rewriters=2532.04 KB/sec
Avg throughput per process  =1266.02 KB/sec

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

2012-01-20 Thread Horacio
Some comments about performance:
- reading works well with big and small block sizes
- writing with big block size works ok
- the problem arise when writing with small block size

--

Reading works ok with small and large block size:

reading blocks of 1KiB from sda2

# /usr/bin/time dd if=/dev/sda2 of=/dev/null bs=1024 count=$(( 1024*32 )) 
32768+0 records in
32768+0 records out
33554432 bytes (34 MB) copied, 0.48956 s, 68.5 MB/s
0.00user 0.07system 0:00.49elapsed 14%CPU (0avgtext+0avgdata 3552maxresident)k
66016inputs+0outputs (0major+268minor)pagefaults 0swaps

# /usr/bin/time dd if=/dev/sda2 of=/dev/null bs=1024 count=$(( 1024*1024 )) 
1048576+0 records in
1048576+0 records out
1073741824 bytes (1.1 GB) copied, 8.74106 s, 123 MB/s
0.08user 2.23system 0:08.74elapsed 26%CPU (0avgtext+0avgdata 3536maxresident)k
2097632inputs+0outputs (0major+268minor)pagefaults 0swaps

reading blocks of  1MiB from sdb2 (to ensure that nothing is cached)

# /usr/bin/time dd if=/dev/sdb2 of=/dev/null bs=$((1024*1024)) count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 8.76866 s, 122 MB/s
0.00user 1.82system 0:08.77elapsed 20%CPU (0avgtext+0avgdata 7616maxresident)k
2097408inputs+0outputs (0major+522minor)pagefaults 0swaps

Now, writing with blocks of 16MiB works ok (64.5 MB/s!!!)

# /usr/bin/time dd if=/dev/zero of=/mnt/rsync/zeros bs=$((1024*1024*16)) 
count=128 oflag=dsync
128+0 records in
128+0 records out
2147483648 bytes (2.1 GB) copied, 33.2825 s, 64.5 MB/s
0.00user 6.69system 0:33.37elapsed 20%CPU (0avgtext+0avgdata 69072maxresident)k
1464inputs+4195328outputs (0major+4363minor)pagefaults 0swaps

With 1MiB the performance is bad (12.1 MB/s)

# /usr/bin/time dd if=/dev/zero of=/mnt/rsync/zeros bs=$((1024*1024)) count=256 
oflag=dsync
256+0 records in
256+0 records out
268435456 bytes (268 MB) copied, 22.1709 s, 12.1 MB/s
0.00user 0.97system 0:22.17elapsed 4%CPU (0avgtext+0avgdata 7616maxresident)k
40inputs+524288outputs (1major+521minor)pagefaults 0swaps

With 1KiB I got.. 33.3 kB/s!!! (I pressed Ctrl+C after some time)

# /usr/bin/time dd if=/dev/zero of=/mnt/rsync/zeros bs=1024 count=$(( 1024*32 
)) oflag=dsync
(pressed Ctrl+C)
^C9069+0 records in
9069+0 records out
9286656 bytes (9.3 MB) copied, 279.276 s, 33.3 kB/s
Command terminated by signal 2
0.00user 1.30system 4:39.90elapsed 0%CPU (0avgtext+0avgdata 3504maxresident)k
0inputs+72552outputs (0major+265minor)pagefaults 0swaps

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

2012-01-20 Thread Horacio
I've made more test with the guidance of Peter Petrakis, I've physically
removed the LSI card  and tryied with a newer kernel (3.0.0-15) without
luck... the performance is the same (read ok, but slow writes).

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

2012-01-10 Thread Peter Petrakis
Worked with the user on irc and ruled out screaming interrupts
and the LSI card itself (he removed it). User is upgrading to 3.x
kernel and will apprise us of his progress here.

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

2012-01-10 Thread Horacio
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

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

2012-01-09 Thread Peter Petrakis
** Changed in: libvirt (Ubuntu)
   Status: New => Incomplete

** Changed in: udev (Ubuntu)
   Status: New => Incomplete

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

2012-01-03 Thread Peter Petrakis
In re-examining the evidence and chatting with Serge a few things come
to mind.

1) There's a disparity between the conclusion formed in comment #3 and the 
latest
udev logs. It could easily be true that the udev logging simply was held long 
enough
for that last LV to be activated. It appears to be true that if we wait long 
enough
(approx 10 mins) that all LVs will come online.

2) The crux is udev being starved of events or is it being stalled by
some other action?

3) Comment #9 compelled me to dig around concerning the backing store's to the
RAID 1 software set. The WD20EARS appear to use 4K sectors, which if true
would lend credence to *slowness* being the factor (udev is starved) which
determines why it takes almost 10 mins to discover all the LVs.

Follow up:
1) verify sector size of backing stores by installing sg3-utils and posting the 
result of
 # sg_readcap /dev/sda
and
 # cat /sys/block/sda/queue/physical_block_size

2) the basic dd test is fine, please re-run with a sweep of blocksizes, 512, 
4k, 8k, 1024k
with "count=100" so it doesn't run forever

3) an additional io benchmark would be informative like iozone or iometer, 
whatever
is your preference.

Conclusion:
If this is an alignment issue then we've got a lot of work to do. You might be 
able
to resize/grow the MD array to change the stripe size to be a multiple of the 
sector
size. Though you would need to carry the exercise all the way through, 
including LVM
metadata offsets. It would be optimal if you had a duplicate set of drives to 
reproduce
this issue on a separate system. Thanks.

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

2012-01-03 Thread Serge Hallyn
Sure enough, lv_robot-pv0 (the backing lv for the vm) doesn't show up
either in the lvscan or udev debug output.

Certainly a lvm failure here.

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

2012-01-03 Thread Serge Hallyn
** Changed in: libvirt (Ubuntu)
   Status: Incomplete => New

** Changed in: udev (Ubuntu)
   Status: Incomplete => New

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

2011-12-21 Thread Horacio
I've attached /dev/.initramfs/udev.out. I don'n know if this is
relevant, but the write performance on the disks is horrible, I think
this could be caused by mis-aligment of partitions ("dd if=/dev/zero
of=zeros bs=64b oflag=dsync" gives me around 400kB/s)

** Attachment added: "Contents of /dev/.initramfs/udev.out"
   
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/893450/+attachment/2642972/+files/udev.out

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

2011-12-14 Thread Horacio
This is the output of the lvm scan commands. I'll ask permission to
reboot the server tonight to post the debug output of udev.

web4:~# sudo pvscan
  PV /dev/md1   VG vg_default   lvm2 [1.81 TiB / 1.33 TiB free]
  Total: 1 [1.81 TiB] / in use: 1 [1.81 TiB] / in no VG: 0 [0   ]

web4:~# sudo vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "vg_default" using metadata type lvm2

web4:~# sudo lvscan
  ACTIVE'/dev/vg_default/lv_desa_web_2-root' [5.00 GiB] inherit
  ACTIVE'/dev/vg_default/lv_desa_web_2-swap' [1.00 GiB] inherit
  ACTIVE'/dev/vg_default/lv_desa_web_2-pv0' [150.00 GiB] inherit
  ACTIVE'/dev/vg_default/lv_rsync' [200.00 GiB] inherit
  ACTIVE'/dev/vg_default/lv_cms2-pv0' [10.00 GiB] inherit
  ACTIVE'/dev/vg_default/lv_cms2-root' [4.00 GiB] inherit
  ACTIVE'/dev/vg_default/lv_jaime-root' [5.00 GiB] inherit
  ACTIVE'/dev/vg_default/lv_jaime-pv0' [10.00 GiB] inherit
  ACTIVE'/dev/vg_default/lv_monitor-swap' [1.00 GiB] inherit
  ACTIVE'/dev/vg_default/lv_monitor-root' [5.00 GiB] inherit
  ACTIVE'/dev/vg_default/lv_monitor-pv0' [50.00 GiB] inherit
  ACTIVE'/dev/vg_default/lv_monitor-var' [47.00 GiB] inherit

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

2011-12-05 Thread Serge Hallyn
Please don't change the state from incomplete until the requested
information has been provided.

** Changed in: udev (Ubuntu)
   Status: Confirmed => Incomplete

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

2011-12-05 Thread MR_JOC
** Changed in: udev (Ubuntu)
   Status: Incomplete => Confirmed

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

2011-11-28 Thread Serge Hallyn
Hi,

to find out more, we need the udev debug output.  Could you please edit
/usr/share/initramfs-tools/scripts/init-top/udev so that the line
starting udevd reads:

/sbin/udevd --daemon --debug --resolve-names=never >
/dev/.initramfs/udev.out 2>&1

then run

  sudo update-initramfs -k all -u

After a reboot, you'll find the debug info in /dev/.initramfs/udev.out.
Please attach that here.

Please also give us the output of the commands:

  sudo pvscan
  sudo vgscan
  sudo lvscan

** Changed in: udev (Ubuntu)
   Status: New => Incomplete

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

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

2011-11-28 Thread Peter Petrakis
** Summary changed:

- KVM guest fails to autostart sometimes with 
virSecurityDACRestoreSecurityFileLabel error
+ libvirt fails to start correctly because LVM is not ready

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https://bugs.launchpad.net/bugs/893450

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

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