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Date: Fri, 5 Dec 2008 07:06:03 -0800 (PST)
From: Michael Jensen <beachhangar@yahoo.com>
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Subject: [linux-lvm] lvm utilities, metadata format, CRC (checksum)
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	LVM general discussion and development <linux-lvm@redhat.com>
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Earlier attempts at being able to get a storage based snapshot on the same =
server as its master failed because -
- the master is always mounted (production)
- the utilities recognize both master and snap and declare duplicate
- manual edits of the header and label field failed because both are "wrapp=
ed" with CRC that is calculated and checked by the utilities
=A0
I have found the appropriate sections of the source where the header and la=
bel are checked and CRC calc'd.
=A0
Are there any lvm developers on the list that could advise best way to carv=
e up a utility to perform these changes=A0 - pv uuid, lv uuid, vg name,...=
=A0=20
=A0
Thanks,
Mike
=A0=0A=0A=0A      
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<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV>Earlier attempts at being able to get a storage based snapshot on the same server as its master failed because -</DIV>
<DIV>- the master is always mounted (production)</DIV>
<DIV>- the utilities recognize both master and snap and declare duplicate</DIV>
<DIV>- manual edits of the header and label field failed because both are "wrapped" with CRC that is calculated and checked by the utilities</DIV>
<DIV>&nbsp;</DIV>
<DIV>I have found the appropriate sections of the source where the header and label are checked and CRC calc'd.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Are there any lvm developers on the list that could advise best way to carve up a utility to perform these changes&nbsp; - pv uuid, lv uuid, vg name,...&nbsp; </DIV>
<DIV>&nbsp;</DIV>
<DIV>Thanks,</DIV>
<DIV>Mike</DIV>
<DIV>&nbsp;</DIV></td></tr></table><br>

      
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