Package: linux-2.6
Version: 2.6.32-34
Severity: normal

Hi,

At first I must point out:

For me Squeeze is far away from being the best Debian ever.
I'm really disappointed from the quality of Debian Squeeze as server OS.
I began testing when Squeeze became stable. Too many problems. Much too much time spent on testing, finding errors and fixing/workaround (my boss really loves me now for the work that did not succeed during the last few months).

I don't know where to point this problems out at a higher position, because they are more general? Is there a contact to the "Debian management" where I can ask for more stability and completeness of Debian than for new features (possibly fine for a desktop only distri)? Answering this question would be nice!

Our business must have all security fixes within 3 months after release.
Also we have 24/7 web services, servers mostly clustered, where every minute downtime really costs money (if downtime is too long it costs existence).
We can't stay on Lenny for very long. EOL is coming near.
After about half a year Squeeze stable, it is far away from being ready for our production servers.
That's why we decided for now to go with a RHEL clone for our new installed productive servers.
I will keep an eye on Debian. Once the quality comes back....who knows.
A few lines later I describe the problems I had testing Squeeze as XEN DOM0.

My install system for Windows (OPSI) our Solaris servers (Jumpstart) and RHEL based distros (Kickstart) still resides on Debian Squeeze.
Moving them to another platform is a lot of work. That's why it would be still nice to have a live migrateable Debian Squeeze. Here we go:

Sometimes lm works but after migration machine is not reachable through network anymore.
Somebody mentioned a cronjob with traffic on vnet-device would help keeping machine reachable through network.
Mostly lm crashes during migration.

I tested all versions from 2.6.32-30 -- -34.

Dom0 is: Choose on - I tested:

XCP 1.0
OpenSuse 11.3 with Xen 4.0.1
Debian Squeeze (4.0.1)

Squeeze worked most bad as DOM0 and should not be advertised as a working enterprise solution for XEN virtualization:
- crashes our dell r7xx servers when using multipath + iscsi or only iscsi
- live migration (with a working os's(2008R2 f.e.) as DOMU ) works only 5-6 times then it crashes.
f.e. scripted live migration of a 2008R2 and a Lenny DOMU (at the same time) between 2 nodes worked 2 days
(DOMUs reachable all the time) with XCP 1.0 (about 230 live migrations each DOMU), then we stopped testing
- xend freezes
- random reboots of DOM0 due to other reasons that could not be located
- lots of scaring error messages when uptime grows

but back to live migration problem of Debian Squeeze DOMU's:
DomU's are installed with FAI.


Lenny with a similar install works just fine when:
/proc/cmdline: ... clocksource=jiffies
and
/etc/sysctl.conf: ...
xen_independent_wallclock=1
....

Live Migration works also fine with
Win2008R2
Winxpsp3
ncp 3.0.1
RHEL(PUIAS clone) 5.6
RHEL(PUIAS clone) 6.1

I assume the problem is the Squeeze kernel.




-- Package-specific info:
** Version:
Linux version 2.6.32-5-amd64 (Debian 2.6.32-34)

** Command line:
root=/dev/mapper/vg01-root ro console=tty0 console=hvc0

** Not tainted

** Model information
not available

** Loaded modules:
Module Size Used by
nls_utf8 1208 0
isofs 27480 0
loop 11799 0
autofs4 20805 8
nfsd 254782 13
exportfs 3170 1 nfsd
nfs 241114 1
lockd 57603 2 nfsd,nfs
fscache 29834 1 nfs
nfs_acl 2031 2 nfsd,nfs
auth_rpcgss 33476 2 nfsd,nfs
sunrpc 161541 15 nfsd,nfs,lockd,nfs_acl,auth_rpcgss
btrfs 375670 1
zlib_deflate 17746 1 btrfs
crc32c 2560 1
libcrc32c 1074 1 btrfs
ext3 106518 1
jbd 37085 1 ext3
psmouse 49937 0
usbhid 33292 0
hid 63257 1 usbhid
uhci_hcd 18521 0
ohci_hcd 19343 0
ehci_hcd 32081 0
usbcore 122386 4 usbhid,uhci_hcd,ohci_hcd,ehci_hcd
nls_base 6377 3 nls_utf8,isofs,usbcore
dm_crypt 10664 0
snd_pcm 60503 0
snd_timer 15582 1 snd_pcm
snd 46446 2 snd_pcm,snd_timer
soundcore 4598 1 snd
snd_page_alloc 6249 1 snd_pcm
pcspkr 1699 0
joydev 8459 0
evdev 7352 0
ext4 289033 1
mbcache 5050 2 ext3,ext4
jbd2 67015 1 ext4
crc16 1319 1 ext4
dm_mod 53706 10 dm_crypt
raid10 17809 0
raid456 44500 0
async_raid6_recov 5170 1 raid456
async_pq 3479 2 raid456,async_raid6_recov
raid6_pq 77179 2 async_raid6_recov,async_pq
async_xor 2478 3 raid456,async_raid6_recov,async_pq
xor 4380 1 async_xor
async_memcpy 1198 2 raid456,async_raid6_recov
async_tx 1734 5 raid456,async_raid6_recov,async_pq,async_xor,async _memcpy
raid1 18431 0
raid0 5517 0
multipath 6059 0
linear 3455 0
md_mod 73872 6 raid10,raid456,raid1,raid0,multipath,linear
xen_netfront 15196 0
xen_blkfront 8358 5

** PCI devices:

** USB devices:
not available


-- System Information:
Debian Release: 6.0.1
APT prefers stable
APT policy: (990, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-5-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages linux-image-2.6.32-5-amd64 depends on:
ii debconf [debconf-2.0] 1.5.36.1 Debian configuration management sy
ii initramfs-tools [linux-initra 0.98.8 tools for generating an initramfs
ii linux-base 2.6.32-31 Linux image base package
ii module-init-tools 3.12-1 tools for managing Linux kernel mo

Versions of packages linux-image-2.6.32-5-amd64 recommends:
ii firmware-linux-free 2.6.32-31 Binary firmware for various driver

Versions of packages linux-image-2.6.32-5-amd64 suggests:
pn grub | lilo <none> (no description available)
pn linux-doc-2.6.32 <none> (no description available)

Versions of packages linux-image-2.6.32-5-amd64 is related to:
ii firmware-bnx2 0.28 Binary firmware for Broadcom NetXt
ii firmware-bnx2x 0.28 Binary firmware for Broadcom NetXt
pn firmware-ipw2x00 <none> (no description available)
pn firmware-ivtv <none> (no description available)
pn firmware-iwlwifi <none> (no description available)
ii firmware-linux 0.28 Binary firmware for various driver
ii firmware-linux-nonfree 0.28 Binary firmware for various driver
ii firmware-qlogic 0.28 Binary firmware for QLogic IBA7220
pn firmware-ralink <none> (no description available)
pn xen-hypervisor <none> (no description available)

-- debconf information:
linux-image-2.6.32-5-amd64/postinst/depmod-error-initrd-2.6.32-5-amd64: false
linux-image-2.6.32-5-amd64/prerm/removing-running-kernel-2.6.32-5-amd64: true
linux-image-2.6.32-5-amd64/postinst/missing-firmware-2.6.32-5-amd64:
linux-image-2.6.32-5-amd64/postinst/ignoring-do-bootloader-2.6.32-5-amd64:



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On Sun, Jun 05, 2011 at 01:02:09AM +0200, Holger Fischer wrote:
> For me Squeeze is far away from being the best Debian ever.

A _lot_ of people think different. Please move this to debian-devel. I
will not answer this here.

> Sometimes lm works but after migration machine is not reachable through network anymore.

More information. "xm network-list --long $domain" before and after.
Informations about the network setup. Kernel log from the dom0.

> Mostly lm crashes during migration.

Messages?

> Squeeze worked most bad as DOM0 and should not be advertised as a working enterprise solution for XEN virtualization:
> - crashes our dell r7xx servers when using multipath + iscsi or only iscsi

iscsi and enterprise does not match.

> - live migration (with a working os's(2008R2 f.e.) as DOMU ) works only 5-6 times then it crashes.

Windows does not support PV, so no live migration.

Bastian

--
Another dream that failed. There's nothing sadder.
-- Kirk, "This side of Paradise", stardate 3417.3



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Hi Bastian,

thank you for your quick answer. I split this email in 2 parts. Things belonging to the bug I send to 629253@bugs.debian.org. The answers to the rest I sent to you.

.
.
.
>
>> Sometimes lm works but after migration machine is not reachable through network anymore.
>
> More information. "xm network-list --long $domain" before and after.
> Informations about the network setup. Kernel log from the dom0.

I will do this this tests, but I have a lot of projects with higher priority at the moment. So please give me some time for that.

>
>> Mostly lm crashes during migration.
>
> Messages?

see above.

.
.
.

Kind regards

Dipl.-Ing.(FH) Holger Fischer



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Hi,

can't provide test results, but other people having same problem and a bit more info.

http://forums.citrix.com/message.jspa?messageID=1533046

Kind regards

Dipl.-Ing.(FH) Holger Fischer



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Hi Basti, dear maintainers,

Google "debian squeeze live migration xenserver" or "debian squeeze "live migration" citrix".
The first results are not bad.
Read them through and you get an idea (a few people have ideas how to fix).
I tried googling for "squeeze domu live migration" brought me too much results for Squeeze as DOM0.
Possibly "debian squeeze live migration "xen cloud platform"" or "..."xcp"" or "..."oraclevm"" or "..."sles"" gives you some good results too.

f.e. http://forums.citrix.com/thread.jspa?threadID=281439&tstart=0 -> post 13

Using 2.6.38 from backports is not an option. I'm not allowed to use an unmaintained kernel.
Can remember I tested 2.6.38 and remind syslog-ng was not working/segfaulting.

I believe if you test live migration yourself on your test HW with Squeeze DOMU (amd64) on a DOM0 of your choice, you'll get similar results.

Kind regards

Dipl.-Ing.(FH) Holger Fischer


















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On Sun, 2011-06-05 at 01:02 +0200, Holger Fischer wrote:
>
> Sometimes lm works but after migration machine is not reachable
> through network anymore.
> Somebody mentioned a cronjob with traffic on vnet-device would help
> keeping machine reachable through network.

You probably need to set the arp_notify sysctl on the net device inside
the guest. This was fixed upstream and backported into the 2.6.32.32
longterm release which is in the Debian 2.6.32-31 package which was
recently added to Squeeze in a stable update.

Ian.
--
Ian Campbell
Current Noise: Godflesh - Sterile Prophet (Version)

Q: How many mathematicians does it take to screw in a light bulb?
A: One. He gives it to six Californians, thereby reducing the problem
to the earlier joke.




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