Re: [Clonezilla-server-edition] new server edition user with throughput questions

[Steven S. <st...@nc...>]

On 2010/3/30 上午 12:12, George Herndon wrote:
> hi, a brief summary of my environment then a question or two.
>
> i have a dell optiplex gx520 acting as clonezilla se server on debian lenny, upgraded to lenny-stable as of 3/26.  running clonezilla se from testing unstable as of 3/24/2010.  the box has 512Mb ram, a 1.5Tb drive hosting the os and images, connected via 1 GiB ethernet to an HP 8 port procurve switch.
>
> my client pcs are toshiba notebooks (satellite pro l450s with realtek RTL8102E/3E NICs, connecting at<= 100 MB.  the drives are encrypted using truecrypt whole disk encryption and are approx 320G.
>
> i have observed network speeds of approx 4MB/s to 11MB/s using the default clonezilla se impatient client kernel and said switch and server.  for a different client computer with an intel NIC and without truecrypt, i have seen upwards of 650Mb/min (?).  i also observe a fallback to dd based imaging for the truecrypt volumes vs partclone based imaging for the non-truecrypt volumes.
>
> my goal would be to improve the networking throughput to take advantage of GiB networking between the realtek based toshibas and the server.  my questions are:
>
> 1) how can i configure / customize the client PXE boot environment to take advantage of the GiB networking?
This depends on the NIC driver. Normally if it's supported on Debian 
Lenny, it should be 1000 Mbps, unless the network cable quality is not 
good enough to make this.
> 2) am i correct in assuming that the dd fall back is based on the truecrypt whole disk encryption interfering with the partclone / ntfsclone modules?
Yes. It's encrypted so partclone or ntfsclone can not supported that.
> 3) can i optimize dd for faster copies (larger block size, no compression etc)?
You can enter expert mode, choose the option -z0 for no compression.
> 4) would a diff server os (ubuntu vs debian for example) yield different results?
It's possible. Especially the newer kernel might support your hardware 
better.

Steven.
>
> thanks for helping a newbie,
>
> regards, geo
>
>
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Steven Shiau <steven _at_ nchc org tw> <steven _at_ stevenshiau org>
National Center for High-performance Computing, Taiwan.
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