On Sun, Feb 28, 2010 at 1:12 PM, Richard Elling <richard.ell...@gmail.com>wrote:
> On Feb 28, 2010, at 5:05 AM, Lutz Schumann wrote: > > Hello list, > > > > it is damn difficult to destroy ZFS labels :) > > Some people seem to have a knack of doing it accidentally :-) > > > I try to remove the vedev labels of disks used in a pool before. > According to > http://hub.opensolaris.org/bin/download/Community+Group+zfs/docs/ondiskformat0822.pdfI > created a script that removes the first 512 KB and the last 512 KB, > however I always miss the last labels .. > > > > -------------------------------------------- > > LABEL 0 > > -------------------------------------------- > > failed to unpack label 0 > > -------------------------------------------- > > LABEL 1 > > -------------------------------------------- > > failed to unpack label 1 > > -------------------------------------------- > > LABEL 2 > > -------------------------------------------- > > version=14 > > name='pool1' > > state=1 > > txg=26 > > .... > > -------------------------------------------- > > LABEL 3 > > -------------------------------------------- > > version=14 > > name='pool1' > > state=1 > > > > > > How can I calculate or determine the location of the superblocks > described ion the document above ? Has that changed over the versions of ZFS > ? (I now that vdevs now do not need to be exactly the same size in later > OpenSolaris releases, so maybe something has changed) > > It has not changed. The labels are aligned to 256KB boundaries, so your > script needs > to find the correct end. You can also measure this directly using > something like iosnoop > when running zdb -l. > -- richard > > > > > Any hints appreshiated .. > > > > p.s. Clearing the whole disk is troublesome, because those are a bunch of > 1 TB disks and deletion should be fast. > > -- > > This message posted from opensolaris.org > > Perhaps this has already been suggested, but it would seem to me to make a lot more sense to have some sort of "zfs label clear" type command to quickly and easily clear labels... --Tim
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