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Date: Fri, 14 Nov 2008 18:37:51 -0800 (PST)
From: Michael Jensen <beachhangar@yahoo.com>
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Subject: [linux-lvm] Editing LVM 2 metadata
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I have a need to edit the metadata on an LVM2 PV.=A0 It is a storage manage=
d snapshot of a LVM VG.=0A=0AIt appears I can alter the metadata contents t=
hat are in the first 128KB of the device (/dev/sda) using dd and vi.=0A=0AH=
owever, after I edited the LABELONE area where the binary copy of the PV UU=
ID is stored (200x offset area) and the ASCII version at 12b0x and 16b0x an=
d reboot - vgscan no longer recognizes the VG.=0A=0AQuestion - are all the =
UUID's - VG, LV, PV generated as a self-check hash to ensure they haven't b=
een bit-picked or otherwise compromised by the storage??=0A=0AI have downlo=
aded the source, but am not sure yet where to find the code that generates =
the UUID strings.=0A=0AThanks,=0AMike=0A=0A=0A      
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<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>I have a need to edit the metadata on an LVM2 PV.&nbsp; It is a storage managed snapshot of a LVM VG.</DIV>
<DIV>&nbsp;</DIV>
<DIV>It appears I can alter the metadata contents that are in the first 128KB of the device (/dev/sda) using dd and vi.</DIV>
<DIV>&nbsp;</DIV>
<DIV>However, after I edited the LABELONE area where the binary copy of the PV UUID is stored (200x offset area) and the ASCII version at 12b0x and 16b0x and reboot - vgscan no longer recognizes the VG.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Question - are all the UUID's - VG, LV, PV generated as a self-check hash to ensure they haven't been bit-picked or otherwise compromised by the storage??</DIV>
<DIV>&nbsp;</DIV>
<DIV>I have downloaded the source, but am not sure yet where to find the code that generates the UUID strings.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Thanks,</DIV>
<DIV>Mike</DIV></div><br>

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