[ec2-beta] hung processes

[Eric Hammond]

Anna:

Are you snapshotting the EBS volumes?

Does your snapshot process freeze the file system (e.g., xfs_freeze)?

If so, it's possible that the snapshot process failed and left the file
system frozen which would cause some commands to hang, especially if
your current working directory might be on that file system.

If this fits with your experience, try a command like
  xfs_freeze -u /mountpoint
or the equivalent for your file system.

Also note that you generally don't want to include the EBS volume file
systems when rebundling to a new AMI.  Use the --exclude option to
exclude the mount point.

--
Eric Hammond
ehammond at thinksome.com



Anna Hentzel wrote:
> I'm running django, lighttpd, and postgis/postgres.
> 
> The postgres database is on two EBS volumes, mounted raid 0.
> 
> I tried to cluster a large table last night, which I think might have
> been when this problem started.
> 
> -Anna
> 
> On Wed, Feb 25, 2009 at 1:46 PM, Eric Hammond <ehammond at thinksome.com> wrote:
>> Anna:
>>
>> Can you provide more background on what you are doing on the instance?
>>
>> What kinds of software are you running?
>>
>> Are you using EBS (Elastic Block Store) or any other persistent storage
>> mechanism?
>>
>> --
>> Eric Hammond
>> ehammond at thinksome.com
>>
>>
>>
>> Anna Hentzel wrote:
>>> Hi,
>>>
>>> I don't know if this is related to the ubuntu beta or not, but I'm
>>> getting a lot of hung processes that can't be killed even with -9.
>>>
>>> These commands hang:
>>> ps -ef
>>> sudo lsof -i tcp:3033
>>> strace -p 7679
>>>
>>> Also, once I started getting the hung processes, all attempts to
>>> upload bundles are failing. Anyone else see anything like that?
>>>
>>> Thanks
>>> Anna
>>>
>