[Gluster-devel] GlusterFs: Problems with Memory Mapped Files and "apt-get" on debian

[Urban Loesch]

Hi Avati,

thanks. I tried out the latest 2.4 tla. But there is still the same error.

mastersql:/# apt-get update
Get:1 http://security.debian.org etch/updates Release.gpg [189B]       
Get:2 http://security.debian.org etch/updates Release [22.5kB]         
Ign http://security.debian.org etch/updates/main Packages/DiffIndex
Ign http://security.debian.org etch/updates/contrib Packages/DiffIndex
Ign http://security.debian.org etch/updates/non-free Packages/DiffIndex
Get:3 http://security.debian.org etch/updates/main Packages [71.6kB]
Hit http://security.debian.org etch/updates/contrib Packages 
Hit http://security.debian.org etch/updates/non-free 
Packages                 
Get:4 http://ftp.de.debian.org etch Release.gpg 
[378B]                                                                                                      

Hit http://ftp.de.debian.org etch 
Release                                                                                                                   

Ign http://ftp.de.debian.org etch/main 
Packages/DiffIndex                                                                                                   

Ign http://ftp.de.debian.org etch/contrib 
Packages/DiffIndex                                                                                                

Ign http://ftp.de.debian.org etch/non-free 
Packages/DiffIndex                                                                                               

Hit http://ftp.de.debian.org etch/main 
Packages                                                                                                             

Hit http://ftp.de.debian.org etch/contrib 
Packages                                                                                                          

Hit http://ftp.de.debian.org etch/non-free 
Packages                                                                                                         

Fetched 94.2kB in 9s 
(9525B/s)                                                                                                                              

Reading package lists... Error!
E: Couldn't make mmap of 12582912 bytes - mmap (19 No such device)
W: Unable to munmap
E: The package lists or status file could not be parsed or opened.
mastersql:/# apt-cache search
E: Couldn't make mmap of 12582912 bytes - mmap (19 No such device)
W: Unable to munmap

I made an strace of apt-get. The result you can find on the links below. 
Hope that will help.

http://www.enas.net/glusterfs/apt-get-update.txt
http://www.enas.net/glusterfs/apt-cache.txt

Thanks
Urban




Anand Avati wrote:
> Urban,
>  I've made some changes related to the way  mmap files are handled,
> can you please check with the latest TLA (glusterfs--mainline--2.4)
>
> thanks
> avati
>
> 2007/5/15, Urban Loesch <ul at enas.net>:
>> Hi,
>>
>> I have a problem with "mmap" on my GlusterFs test environment and "apt"
>> on Debian.
>>
>> My environment:
>> Hardware:
>> 2 different servers for storage
>> 1 server as client
>> On top of the server I use a virtual server setup (details
>> http://linux-vserver.org).
>>
>> OS:
>> Debian Sarge with self compiled 2.6.19.2 (uname -r 2.6.19.2-vs2.2.0) and
>> latest stable virtual server patch.
>> GlusterFs: latest mainline 2.4 from repository
>>
>> What I'm trying to do:
>> - Create a AFR Mirror over the 2 Servers.
>> - Mount the Volume on Server 3 (Client).
>> - Install on the mounted volume the hole virtual Server with Apache,
>> MySql and so on.
>> So I have a full redundant Virtual Server mirrored over two bricks .
>>
>> After some help from Avati Anand last week the above setup works just
>> fine. I tried out Mysql and it works normally (will make some more tests
>> in the future).
>>
>> But now I have the problem with apt.
>> For example when I try to update the packagelists within the virtual
>> server I get the following error:
>> mastersql:/# apt-get update
>> Get:1 http://security.debian.org etch/updates Release.gpg
>> [189B]
>> ...                                                       Hit
>> http://ftp.de.debian.org etch/non-free
>> Packages
>>
>>
>> Fetched 2B in 7s
>> (0B/s)
>>
>> Reading package lists... Error!
>> E: Couldn't make mmap of 12582912 bytes - mmap (19 No such device)
>> W: Unable to munmap
>> E: The package lists or status file could not be parsed or opened.
>>
>> After some googling I found out, that apt uses "memory mapped files" and
>> it seems that apt can't find some device.
>> But I'm not able to find out which device does it can't find.
>>
>> Short description of MMAP:
>> http://www.ecst.csuchico.edu/~beej/guide/ipc/mmap.html
>>
>> Have you any idea what can cause this problem? Without GlusterFs as the
>> underlaying filesystem the problems not occurs.
>>
>> thanks
>> Urban Loesch
>>
>>
>> _______________________________________________
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>> Gluster-devel at nongnu.org
>> http://lists.nongnu.org/mailman/listinfo/gluster-devel
>>
>
>