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Old 02-17-2009, 07:38 PM
Steve Rippl
 
Default Help! Would you recommend running ltsp on Ubuntu 8.04 or 8.10?

What authentication methods are you using? Are the users local or
remote (ldap/Active Directory?)

john wrote:
> Hi all,
>
> I've been trying to migrate from 7.04 to 8.04 since last fall. I can
> only do it during downtime at our school. I have this week while kids
> are on break to try and get the new system in. My problem is that I
> can't seem to scale the LTSP installation based on 8.04 past 6-8 thin
> clients before the server crashes. The server is running 16 gigs ram/
> AMD 64 image with Ntavo 6030 thin clients each with 512M ram. The thin
> clients are rolled with the i386 image.
>
> I can't find anything in the logs that shows me where the problem
> lies. I've been running 7.04 successfully for a couple of years now
> so I feel like the problem lies with 8.04 somewhere. I am trying to
> decide whether to can 8.04 and begin working on 8.10. Or perhaps
> retry 8.04 under 32 bit with the Server-Image kernel for larger memory
> support. Can any one give me some guidance? Did you make 8.04 work
> just fine (if so did you do it under 32 or 64) or did you end up going
> for the latest and the greatest? All things being equal I'd prefer to
> run 8.04 since it'll be supported till 2011.
>
> Thanks for any advice.
>
> John
>
>

--
Steve Rippl
Technology Director
Woodland School District
360 225 9451 x326


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Old 02-17-2009, 07:45 PM
john
 
Default Help! Would you recommend running ltsp on Ubuntu 8.04 or 8.10?

On Tue, Feb 17, 2009 at 11:25 AM, Jordan Erickson
<jerickson@logicalnetworking.net> wrote:
> Hey John,
>
> I run 8.04.2 (i386) on servers with half as much ram as yours, and
> haven't had any showstopping issues like what you're describing. I ran
> into issues with the 64-bit server, but that was back in the Edgy/Fiesty
> days, and I'm sure most of them have been fixed by now. It was also not
> performance related.
>
> Is your server NIC recognized at its full capacity (hopefully
> 1Gbit/sec)? Use 'ethtool' to find out. You're using the -server kernel
> right? Also, let us know about any customizations, including nbd swap,
> any lts.conf parms, etc.
>

sudo ethtool eth5
Settings for eth5:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: umbg
Wake-on: d
Current message level: 0x00000007 (7)
Link detected: yes

Settings for eth6:

Supported ports: [ MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 17
Transceiver: external
Auto-negotiation: on
Supports Wake-on: g
Wake-on: d
Link detected: yes


My syslog is peppered with things like this:


syslog.4.gz:Feb 12 12:05:20 192.168.0.215 kernel: [1218745.977736]
end_request: I/O error, dev nbd0, sector 200128
syslog.4.gz:Feb 12 12:05:20 192.168.0.215 kernel: [1218745.977748]
end_request: I/O error, dev nbd0, sector 200130
syslog.4.gz:Feb 12 12:05:20 192.168.0.215 kernel: [1218745.977760]
end_request: I/O error, dev nbd0, sector 200132
syslog.4.gz:Feb 12 12:05:20 192.168.0.215 kernel: [1218745.977772]
end_reques] end_request: I/O error, dev nbd0, sector 200120
syslog.4.gz:Feb 12 12:05:20 192.168.0.215 kernel: [1218745.981573]
end_request: I/O error, dev nbd0, sector 200176
syslog.4.gz:Feb 12 12:05:20 192.168.0.215 kernel: [1218745.981633]
SQUASHFS error: sb_bread failed reading block 0x186f9
syslog.4.gz:Feb 12 12:05:20 192.168.0.215 kernel: [1218745.981638]
SQUASHFS error: Unable to read page, block 61b69d0, size 7bf4
syslog.4.gz:Feb 12 12:05:20 192.168.0.215 kernel: [1218745.981664]
end_request: I/O error, dev nbd0, sector 200118
syslog.4.gz:Feb 12 12:05:20 192.168.0.215 kernel: [1218745.981673]
nbd0: Attemp] end_request: I/O error, dev nbd0, sector 200134
syslog.4.gz:Feb 12 12:05:20 192.168.0.215 kernel: [1218745.982666]
end_request: I/O error, dev nbd0,] end_request: I/O error, dev nbd0,
sector 200138
syslog.4.gz:Feb 12 12:05:20 192.168.0.215 kernel: [1218745.985782]
end_request: I/O error, dev nbd0, sector 2001

However I don't know if this is users shutting down the thin clients
incorrectly or part of the problem I am chasing.


Thanks for any ideas.

John

>
> Cheers,
> Jordan/Lns
>
>
> john wrote:
>> Hi all,
>>
>> I've been trying to migrate from 7.04 to 8.04 since last fall. I can
>> only do it during downtime at our school. I have this week while kids
>> are on break to try and get the new system in. My problem is that I
>> can't seem to scale the LTSP installation based on 8.04 past 6-8 thin
>> clients before the server crashes. The server is running 16 gigs ram/
>> AMD 64 image with Ntavo 6030 thin clients each with 512M ram. The thin
>> clients are rolled with the i386 image.
>>
>> I can't find anything in the logs that shows me where the problem
>> lies. I've been running 7.04 successfully for a couple of years now
>> so I feel like the problem lies with 8.04 somewhere. I am trying to
>> decide whether to can 8.04 and begin working on 8.10. Or perhaps
>> retry 8.04 under 32 bit with the Server-Image kernel for larger memory
>> support. Can any one give me some guidance? Did you make 8.04 work
>> just fine (if so did you do it under 32 or 64) or did you end up going
>> for the latest and the greatest? All things being equal I'd prefer to
>> run 8.04 since it'll be supported till 2011.
>>
>> Thanks for any advice.
>>
>> John
>>
>>
>
>
> --
> Jordan Erickson
> Owner, Logical Networking Solutions
> http://www.logicalnetworking.net
> 707-636-5678
>
> Latest LNS Blogs - http://blog.logicalnetworking.net
>
> ZDNet: Normal people like KDE4 under Linux better than Windows
> Microsoft silently installs Firefox extension through OS update
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>
>
> --
> edubuntu-users mailing list
> edubuntu-users@lists.ubuntu.com
> Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/edubuntu-users
>

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Old 02-17-2009, 07:46 PM
john
 
Default Help! Would you recommend running ltsp on Ubuntu 8.04 or 8.10?

On Tue, Feb 17, 2009 at 12:38 PM, Steve Rippl
<rippls@woodlandschools.org> wrote:
> What authentication methods are you using? Are the users local or remote
> (ldap/Active Directory?)
Hi Steve,

I am using Winbind/Active Directory. Users have a home directory on
the server and a network share which is mounted via NFS.

John



>
> john wrote:
>>
>> Hi all,
>>
>> I've been trying to migrate from 7.04 to 8.04 since last fall. I can
>> only do it during downtime at our school. I have this week while kids
>> are on break to try and get the new system in. My problem is that I
>> can't seem to scale the LTSP installation based on 8.04 past 6-8 thin
>> clients before the server crashes. The server is running 16 gigs ram/
>> AMD 64 image with Ntavo 6030 thin clients each with 512M ram. The thin
>> clients are rolled with the i386 image.
>>
>> I can't find anything in the logs that shows me where the problem
>> lies. I've been running 7.04 successfully for a couple of years now
>> so I feel like the problem lies with 8.04 somewhere. I am trying to
>> decide whether to can 8.04 and begin working on 8.10. Or perhaps
>> retry 8.04 under 32 bit with the Server-Image kernel for larger memory
>> support. Can any one give me some guidance? Did you make 8.04 work
>> just fine (if so did you do it under 32 or 64) or did you end up going
>> for the latest and the greatest? All things being equal I'd prefer to
>> run 8.04 since it'll be supported till 2011.
>>
>> Thanks for any advice.
>>
>> John
>>
>>
>
> --
> Steve Rippl
> Technology Director
> Woodland School District
> 360 225 9451 x326
>
>

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Old 02-17-2009, 08:03 PM
Steve Rippl
 
Default Help! Would you recommend running ltsp on Ubuntu 8.04 or 8.10?

Now I never found out why but both dhcp and authentication via winbind
(or ldap) to Active Directory seem to be broken in 8.04 (running ltsp
5).* If you look back over the last few (4-5) months on this list
you'll find myself and one or two others found dhcp couldn't handle
more than about 5 clients booting at once (the clients would hammer the
dhcp server for multiple requests each), and our entire server would
grind to a halt if more than a few users tried to log in at once
(separate issues).* We're authenticating to AD with ldap and also have
NFS shares set up like you, our load average on the server would soar
to 16 and beyond (2 dual core processors) and would never come down
again!



We went back to ltsp 4 again and everything seemed to run much much
faster.* Now we're working to build another server and trying ltsp 5
again (on Debian) to see were things are.



No answers I'm afraid, but it sounds similar to what we found...







john wrote:

On Tue, Feb 17, 2009 at 12:38 PM, Steve Rippl
<rippls@woodlandschools.org> wrote:


What authentication methods are you using? Are the users local or remote
(ldap/Active Directory?)


Hi Steve,

I am using Winbind/Active Directory. Users have a home directory on
the server and a network share which is mounted via NFS.

John





john wrote:


Hi all,

I've been trying to migrate from 7.04 to 8.04 since last fall. I can
only do it during downtime at our school. I have this week while kids
are on break to try and get the new system in. My problem is that I
can't seem to scale the LTSP installation based on 8.04 past 6-8 thin
clients before the server crashes. The server is running 16 gigs ram/
AMD 64 image with Ntavo 6030 thin clients each with 512M ram. The thin
clients are rolled with the i386 image.

I can't find anything in the logs that shows me where the problem
lies. I've been running 7.04 successfully for a couple of years now
so I feel like the problem lies with 8.04 somewhere. I am trying to
decide whether to can 8.04 and begin working on 8.10. Or perhaps
retry 8.04 under 32 bit with the Server-Image kernel for larger memory
support. Can any one give me some guidance? Did you make 8.04 work
just fine (if so did you do it under 32 or 64) or did you end up going
for the latest and the greatest? All things being equal I'd prefer to
run 8.04 since it'll be supported till 2011.

Thanks for any advice.

John




--
Steve Rippl
Technology Director
Woodland School District
360 225 9451 x326









--
Steve Rippl
Technology Director
Woodland School District
360 225 9451 x326




--
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Old 02-17-2009, 09:11 PM
john
 
Default Help! Would you recommend running ltsp on Ubuntu 8.04 or 8.10?

Hi Steve,


On Tue, Feb 17, 2009 at 1:03 PM, Steve Rippl <rippls@woodlandschools.org> wrote:
> Now I never found out why but both dhcp and authentication via winbind (or
> ldap) to Active Directory seem to be broken in 8.04 (running ltsp 5).
Interesting was there a bug filed I wonder. I'll go look.

If
> you look back over the last few (4-5) months on this list you'll find myself
> and one or two others found dhcp couldn't handle more than about 5 clients
> booting at once (the clients would hammer the dhcp server for multiple
> requests each), and our entire server would grind to a halt if more than a
> few users tried to log in at once (separate issues).

Would the system handle staggered log ins? For example if students
logged in 30 secs apart?


> We're authenticating
> to AD with ldap and also have NFS shares set up like you, our load average
> on the server would soar to 16 and beyond (2 dual core processors) and would
> never come down again!

Hmm. Interesting. I've setup an snmp monitor to help try an capture
more data on the problem. I'll be sure to check CPU load.
>
> We went back to ltsp 4 again and everything seemed to run much much faster.
> Now we're working to build another server and trying ltsp 5 again (on
> Debian) to see were things are.
>
> No answers I'm afraid, but it sounds similar to what we found...

I appreciate the ideas!

John

>
>
> john wrote:
>
> On Tue, Feb 17, 2009 at 12:38 PM, Steve Rippl
> <rippls@woodlandschools.org> wrote:
>
>
> What authentication methods are you using? Are the users local or remote
> (ldap/Active Directory?)
>
>
> Hi Steve,
>
> I am using Winbind/Active Directory. Users have a home directory on
> the server and a network share which is mounted via NFS.
>
> John
>
>
>
>
>
> john wrote:
>
>
> Hi all,
>
> I've been trying to migrate from 7.04 to 8.04 since last fall. I can
> only do it during downtime at our school. I have this week while kids
> are on break to try and get the new system in. My problem is that I
> can't seem to scale the LTSP installation based on 8.04 past 6-8 thin
> clients before the server crashes. The server is running 16 gigs ram/
> AMD 64 image with Ntavo 6030 thin clients each with 512M ram. The thin
> clients are rolled with the i386 image.
>
> I can't find anything in the logs that shows me where the problem
> lies. I've been running 7.04 successfully for a couple of years now
> so I feel like the problem lies with 8.04 somewhere. I am trying to
> decide whether to can 8.04 and begin working on 8.10. Or perhaps
> retry 8.04 under 32 bit with the Server-Image kernel for larger memory
> support. Can any one give me some guidance? Did you make 8.04 work
> just fine (if so did you do it under 32 or 64) or did you end up going
> for the latest and the greatest? All things being equal I'd prefer to
> run 8.04 since it'll be supported till 2011.
>
> Thanks for any advice.
>
> John
>
>
>
>
> --
> Steve Rippl
> Technology Director
> Woodland School District
> 360 225 9451 x326
>
>
>
>
>
>
> --
> Steve Rippl
> Technology Director
> Woodland School District
> 360 225 9451 x326
>

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