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List:       sisuite-users
Subject:    Re: [sisuite-users] Inconsistent units = Shrinking partition sizes
From:       "Brian Elliott Finley" <brian () thefinleys ! com>
Date:       2010-07-05 15:01:42
Message-ID: 1545348141-1278342101-cardhu_decombobulator_blackberry.rim.net-238432940- () bda323 ! bisx ! prod ! on ! blackberry
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Thanks, Tyler. 

I'll look into making this change in the next major release. 

Cheers,

Brian
 
Brian Elliott Finley
Mobile: 630.447.9108

-----Original Message-----
From: Tyler Sutherland <tsutherland@iders.ca>
Date: Mon, 05 Jul 2010 08:45:30 
To: <sisuite-users@lists.sourceforge.net>
Reply-To: sisuite-users@lists.sourceforge.net
Subject: [sisuite-users] Inconsistent units = Shrinking partition sizes

Hi,

I'm using the SystemImager 4.0.2 stable release on an HP ProLiant DL380
G5 server with CentOS 5.4.  It's a 32 bit OS on an i686 architecture.

I've noticed an issue where disk partitions get 5% smaller each time I
do a system restore because of an incompatibility in the units that are
used during the image and during the restore. 

I dug into the code a little bit and found that the partition sizes are
recorded as MB = 2^20 Bytes = 1,048,576 bytes during the image using a
command like "sfdisk -l -uM /dev/mydiskname".  Then those sizes are
passed to "parted" during the restore when creating the partitions.  

The issue is that "parted" units are in MB = 1,000,000 bytes.  So the
result is that all partitions except the last one on the disk shrink
by 5% and the final partition is assigned the remaining extra space.

My solution is to comment out lines 957, 958 and 959 of
"/usr/sbin/si_prepareclient".  ie: To comment out these lines:

if($arch eq "i386") {                                                
   $preferred_tool = 'sfdisk';                                  
} 

This forces SystemImager to use "parted" when reading disk sizes during
imaging on the x86 architecture.  I can see a difference in the
partition sizes listed in "/etc/systemimager/autoinstallscript.conf"
before and after making the change listed above.  So, there seems to be
a difference in the partition sizes when they are read using parted and
when they're read using sfdisk.

Has anyone else seen this issue?  Is there a recommended workaround?

Thanks,

Tyler



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