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junneyang / zumastor

Automatically exported from code.google.com/p/zumastor
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Zumastor + VMWare Server+ Windows = hang #150

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
What steps will reproduce the problem?
1. Install Zumastor 0.8.0 on Ubuntu Hardy (kernel 2.6.24) and install
VMware Server 1.0.6 (it also happens with 1.0.5)
2. Create your virtual machines in a zumastor-ed volume
3. Try to install Windows 2003 Server. Installation does finish, and the
vmware-vmx processes (one for each running virtual machine) remain defunct
because files cannot be closed.

Ubuntu Hardy Server does not cause VMWare to hang.

I'm going to test with Windows XP and 2008 and will report.

What is the expected output? What do you see instead?

I'd expect everything to work fine but it does not. IIRC, with Gutsy and
VMware 1.0.4 (latest version back then) it worked fine.

Please use labels and text to provide additional information.

boom

Original issue reported on code.google.com by pgqui...@gmail.com on 2 Jun 2008 at 3:46

GoogleCodeExporter commented 9 years ago 
Do you see the problem with the same zumastor kernel but non-zumastored volume? 
Could
you post a sysrq-t trace and server.log if the problem only happens on z 
zumastor-ed
volume? Thanks!

Jiaying

Original comment by jiayin...@gmail.com on 3 Jun 2008 at 1:51

GoogleCodeExporter commented 9 years ago 
I think the problem is due to the slowness of Zumastor with kernel 2.6.24. I'd 
say
what happens is:
1. VMWare starts writing data
2. Data is cached in the cache of the RAID controller (512MB) and maybe in RAM 
(I
know this is done for reading but I'm not sure it's done for writing)
3. Data starts to be written to disk but as writes are slow in Zumastor 0.8.0 +
kernel 2.6.24, VMWare deadlocks

I've hit the bug with VMware but I guess other applications would crash as well 
if
they do not handle properly very slow writes.

Reproducing the crash is not as easy as I first said. It depends on how much 
you need
to write to disk. 

The first three times it crashed, it was with 2 virtual machines: Ubuntu Server 
and
Windows 2003 Server. As Ubuntu Server installs in only a few minutes and it's a 
small
footprint (as opposed to the relatively big footprint of a Windows 2003
installation). The fourth time I tried this, I installed a Windows 2003 fine, 
then a
Windows XP, then Ubuntu + Windows 2008 and that was when it crashed.

Original comment by pgqui...@gmail.com on 4 Jun 2008 at 6:59