[Ltsp-discuss] Best RAID HW/SW - LVM combination

[Francesco Parisi]

At school we have a HP server (CPU Intel 2 x 6-core, 64GB RAM) with 3 x
600GB 6G SAS 10Krpm, RAID 5.

We would install on it a Debian Edu 7.0 (combined server: "main" and LTSP
server).

The thin clients are all Atom, 1GB RAM (number: 30) and they will work as
"diskless" (low-fat clients).

Our main tasks: software development (gcc, eclipse, ruby, mysql).

Was wondering what is the best RAID HW/SW - LVM combination to get the best
performance,
according to your opinion.

Thanks in advance
Frank

[a.]

I am trying out ltsp for our setup of multiple servers. I currently
cannot find a way to easily provision a minimal ubuntu image, where
basically nothing else is installed but the necessary os and a openssh
server.

However I run ltsp-build-client it always installs a complete ubuntu
desktop including x11, ldm, cups, etc.

How can I build a minimal server os for the clients?

[Johan Kragsterman]

-----"a." <***@riseup.net> skrev: -----
Till: ltsp-***@lists.sourceforge.net
Från: "a." <***@riseup.net>
Datum: 2014-07-31 21:22
Ärende: [Ltsp-discuss] Minimal server os on clients

I am trying out ltsp for our setup of multiple servers. I currently
cannot find a way to easily provision a minimal ubuntu image, where
basically nothing else is installed but the necessary os and a openssh
server.

However I run ltsp-build-client it always installs a complete ubuntu
desktop including x11, ldm, cups, etc.

How can I build a minimal server os for the clients?


Hi!

I wanted to do the same, and got an advice from Vagrant to do:

"On Debian, "ltsp-build-client --early-packages ltsp-client-core ..." works.
Might work on Ubuntu..."

But it didn't work on my edubuntu 14.04....

Rgrds Johan


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[Rainer Stumbaum]

Hi Johan,
we operate over 150 Servers using LTSP as a base and have some scripts to mount extra file systems and start and stop services.

We just install ltsp-client-core in the image and during boot start an additional script in /etc/init.d/rcS.d to

- mount filesystems
- copy configuration files
- add services using update-rc.d

All applications are installed into that image and we just deactivate after installation the startup using

update-rc.d -f <service> remove

I actually had never contact to anybody else running servers based on LTSP and nobody ever seemed interested.

But we have a LTSP Diskless server running here with an uptime of
18:34:38 up 600 days, 11:49, 1 user, load average: 0.11, 0.07, 0.01

Best regards
Rainer



Johan Kragsterman <***@capvert.se> schrieb am 21:43 Donnerstag, 31.Juli 2014:





-----"a." <***@riseup.net> skrev: -----
Till: ltsp-***@lists.sourceforge.net
Från: "a." <***@riseup.net>
Datum: 2014-07-31 21:22
Ärende: [Ltsp-discuss] Minimal server os on clients

I am trying out ltsp for our setup of multiple servers. I currently
cannot find a way to easily provision a minimal ubuntu image, where
basically nothing else is installed but the necessary os and a openssh
server.

However I run ltsp-build-client it always installs a complete ubuntu
desktop including x11, ldm, cups, etc.

How can I build a minimal server os for the clients?


Hi!

I wanted to do the same, and got an advice from Vagrant to do:

"On Debian, "ltsp-build-client --early-packages ltsp-client-core ..." works.
Might work on Ubuntu..."

But it didn't work on my edubuntu 14.04....

Rgrds Johan


------------------------------------------------------------------------------
Infragistics Professional
Build stunning WinForms apps today!
Reboot your WinForms applications with our WinForms controls.
Build a bridge from your legacy apps to the future.
http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk
_____________________________________________________________________
Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto:
https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
For additional LTSP help, try #ltsp channel on irc.freenode.net





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Build stunning WinForms apps today!
Reboot your WinForms applications with our WinForms controls.
Build a bridge from your legacy apps to the future.
http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk
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[Helmut Lichtenberg]

Hi Rainer,

Rainer Stumbaum schrieb am 19.09.2014 18:35:
> we operate over 150 Servers using LTSP as a base and have some scripts to mount extra file systems and start and stop services.
>
> We just install ltsp-client-core in the image and during boot start an additional script in /etc/init.d/rcS.d to
>
> - mount filesystems
> - copy configuration files
> - add services using update-rc.d
>
> All applications are installed into that image and we just deactivate after installation the startup using
>
> update-rc.d -f <service> remove
>
> I actually had never contact to anybody else running servers based on LTSP and nobody ever seemed interested.
>
> But we have a LTSP Diskless server running here with an uptime of
> 18:34:38 up 600 days, 11:49, 1 user, load average: 0.11, 0.07, 0.01

interesting setup. Do you run the "LTSP Diskless server" (are these the 150
units?) also as kind of LTSP clients with their own server image? NFS or NBD?

Greetings
Helmut

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-------------------------------------------------------------------------
Helmut Lichtenberg <***@fli.bund.de> Tel.: [phone]
Institut für Nutztiergenetik (FLI) 31535 Neustadt Germany
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[Jeff Siddall]

On 07/29/2014 01:31 PM, Francesco Parisi wrote:
> At school we have a HP server (CPU Intel 2 x 6-core, 64GB RAM) with 3 x
> 600GB 6G SAS 10Krpm, RAID 5.
>
> We would install on it a Debian Edu 7.0 (combined server: "main" and
> LTSP server).
>
> The thin clients are all Atom, 1GB RAM (number: 30) and they will work
> as "diskless" (low-fat clients).
>
> Our main tasks: software development (gcc, eclipse, ruby, mysql).
>
> Was wondering what is the best RAID HW/SW - LVM combination to get the
> best performance,
> according to your opinion.

I realize this is old but maybe you (or someone else) are still interested.

In general, the higher the RAID level the lower the _write_ performance.

If you are using RAID mainly for the redundancy then the general
recommendation is to go with RAID1

Of course you can combine RAID also (ex: RAID10) to suite your needs.

I have been using SW RAID in Linux for literally decades and, with the
exception of levels that require checksum, the performance is fine for
most things. Ditto LVM (which I highly recommend).

Jeff