On Mon, Aug 13, 2007 at 11:33:53PM +0200, Nils Vogels wrote:
Hey Oskar!
On 8/13/07, Oskar Pienkos oskar_pienkos@sfu.ca wrote:
Hello,
I'm decommissioning my old 740 running Ontapp 6.2.2 and would like to wipe the disk content. Any ideas how can I do it?
I'd boot into maintenance mode and choose to reinitialise disks and reinstall ONTAP. On ONTAP versions 7 that's menu choice 4.
How well does this erase the contents? Is it all overwritten? How often? Or is it just a reformat of some kind that only rewrites the meta data?
What does 'disk zero spares' actually do?
One time, when I really needed to be sure the data was gone forever, I reformatted the disks to 512 bps an ran wipe on them (http://wipe.sourceforge.net/)
TIA,
I suspect that Option 4 (Initialize all disks) only wipes out the metadata and does not actually rewrite any disk blocks as it does not take very long to complete
disk zero spares zero's out all your spare disks. The benefit of this is faster rebuild of a spare should a disk fail. If the spares aren't zero'd the first thing ONTAP will do when it grabs a spare is zero it, thus taking longer to rebuild ----- Original Message ----- From: "Bert Kiers" kiersb@xs4all.net To: "Nils Vogels" bacardicoke@gmail.com Cc: toasters@mathworks.com Sent: Tuesday, August 14, 2007 11:29 AM Subject: Re: Disk content erase on a 740 running 6.2.2.
On Mon, Aug 13, 2007 at 11:33:53PM +0200, Nils Vogels wrote:
Hey Oskar!
On 8/13/07, Oskar Pienkos oskar_pienkos@sfu.ca wrote:
Hello,
I'm decommissioning my old 740 running Ontapp 6.2.2 and would like to wipe the disk content. Any ideas how can I do it?
I'd boot into maintenance mode and choose to reinitialise disks and reinstall ONTAP. On ONTAP versions 7 that's menu choice 4.
How well does this erase the contents? Is it all overwritten? How often? Or is it just a reformat of some kind that only rewrites the meta data?
What does 'disk zero spares' actually do?
One time, when I really needed to be sure the data was gone forever, I reformatted the disks to 512 bps an ran wipe on them (http://wipe.sourceforge.net/)
TIA,
Bert Kiers XS4All UNIX systeembeheerder, suspected terrorist
"Bill Holland" hollandwl@gmail.com writes
I suspect that Option 4 (Initialize all disks) only wipes out the metadata and does not actually rewrite any disk blocks as it does not take very long to complete
It's only fast if the disks are pre-zeroed, surely?
disk zero spares zero's out all your spare disks. The benefit of this is faster rebuild of a spare should a disk fail. If the spares aren't zero'd the first thing ONTAP will do when it grabs a spare is zero it, thus taking longer to rebuild
No. Having a spare pre-zeroed makes it fast to add it to an aggregate (or traditional volume): it is in that case that it otherwise has to be zeroed first (to maintain correct parity). It makes no difference whether it is pre-zeroed or not if it is used in a RAID rebuild after a disk failure.
As I stated in the first reponse of this thread...
et yourself a disk_sanitization license (it is free!) (once installed, you cannot remove)
Boot to the floppy menu. Use the menu to create a 2 disk root volume. When finished, run through the setup. Install your Disk_sanitization license then run the command:
disk sanitize start x.1 x.2 x.3 etc...
This will by default, write 3 patterns: 0x55 0xaa (the compliment of 0x55, 0x55 + 0xaa = 0xff) 0x3c (the 3 is three up and the c is three down, another nice off-setting bit pattern)
I believe it even starts off with a low-level format before the bit patterns.
When complete, I think the disks are move out of the spare pool so you know what is done and what is not.
At this point, you would need to be the federal government, invest lots of money for specialized gear and spend lots of time to get data off the disks.
Why are those bit patterns important?
Disks are magnetic. They are nor absolute 1 or absolute 0. they "lean" towards 1 or "lean" towards 0. If the data has been on the drive long enough, the bits will have a tendancy to "lean a particular" way.
The bit pattern excersize will force the bits one way, then the other: 0x55 = 01010101 0xaa = 10101010 0x3c = 00111100
See the pattern now? These patterns try to reduce the amount of "leaning" going on.
If you want to be sure the data is gone without physical desruction, this is the best way to go. Of course, you can tell the command to use your own bit patterns and/or how many cycles to run.
--tmac
On 8/14/07, Bert Kiers kiersb@xs4all.net wrote:
On Mon, Aug 13, 2007 at 11:33:53PM +0200, Nils Vogels wrote:
Hey Oskar!
On 8/13/07, Oskar Pienkos oskar_pienkos@sfu.ca wrote:
Hello,
I'm decommissioning my old 740 running Ontapp 6.2.2 and would like to wipe the disk content. Any ideas how can I do it?
I'd boot into maintenance mode and choose to reinitialise disks and reinstall ONTAP. On ONTAP versions 7 that's menu choice 4.
How well does this erase the contents? Is it all overwritten? How often? Or is it just a reformat of some kind that only rewrites the meta data?
What does 'disk zero spares' actually do?
One time, when I really needed to be sure the data was gone forever, I reformatted the disks to 512 bps an ran wipe on them (http://wipe.sourceforge.net/)
TIA,
Bert Kiers XS4All UNIX systeembeheerder, suspected terrorist
Disk sanitizer is for ONTAP 7x not 6.2.2 and 7x is not available for F740s.
He would have to connect the shelves to a filer running 7x with a sanitizer license ----- Original Message ----- From: tmac To: Bert Kiers Cc: Nils Vogels ; toasters@mathworks.com Sent: Tuesday, August 14, 2007 11:59 AM Subject: Re: Disk content erase on a 740 running 6.2.2.
As I stated in the first reponse of this thread...
et yourself a disk_sanitization license (it is free!) (once installed, you cannot remove)
Boot to the floppy menu. Use the menu to create a 2 disk root volume. When finished, run through the setup. Install your Disk_sanitization license then run the command:
disk sanitize start x.1 x.2 x.3 etc...
This will by default, write 3 patterns: 0x55 0xaa (the compliment of 0x55, 0x55 + 0xaa = 0xff) 0x3c (the 3 is three up and the c is three down, another nice off-setting bit pattern)
I believe it even starts off with a low-level format before the bit patterns.
When complete, I think the disks are move out of the spare pool so you know what is done and what is not.
At this point, you would need to be the federal government, invest lots of money for specialized gear and spend lots of time to get data off the disks.
Why are those bit patterns important?
Disks are magnetic. They are nor absolute 1 or absolute 0. they "lean" towards 1 or "lean" towards 0. If the data has been on the drive long enough, the bits will have a tendancy to "lean a particular" way.
The bit pattern excersize will force the bits one way, then the other: 0x55 = 01010101 0xaa = 10101010 0x3c = 00111100
See the pattern now? These patterns try to reduce the amount of "leaning" going on.
If you want to be sure the data is gone without physical desruction, this is the best way to go. Of course, you can tell the command to use your own bit patterns and/or how many cycles to run.
--tmac
On 8/14/07, Bert Kiers kiersb@xs4all.net wrote: On Mon, Aug 13, 2007 at 11:33:53PM +0200, Nils Vogels wrote: > Hey Oskar! > > On 8/13/07, Oskar Pienkos oskar_pienkos@sfu.ca wrote: > > Hello, > > > > I'm decommissioning my old 740 running Ontapp 6.2.2 and would like to > > wipe the disk content. > > Any ideas how can I do it? > > I'd boot into maintenance mode and choose to reinitialise disks and > reinstall ONTAP. On ONTAP versions 7 that's menu choice 4.
How well does this erase the contents? Is it all overwritten? How often? Or is it just a reformat of some kind that only rewrites the meta data?
What does 'disk zero spares' actually do?
One time, when I really needed to be sure the data was gone forever, I reformatted the disks to 512 bps an ran wipe on them ( http://wipe.sourceforge.net/)
TIA, -- Bert Kiers XS4All UNIX systeembeheerder, suspected terrorist
-- --tmac
RedHat Certified Engineer #804006984323821
Principal Consultant, RABA Technologies 240-373-3926 (office) 301-688-4705 (Lab) 214-279-3926 (eFAX)
It was in 6.5 (which CAN run on all F700 series, F8x, RXX, F800 and FAS900 series).
You call netapp and ask for the license. It is free, with caveats:
The disk sanitization license is PERMANENT and prohibits the following commands from being used on the storage system:
dd (to copy blocks of data) dumpblock (to print dumps of disk blocks) setflag wafl_metadata_visible (to allow access to internal WAFL files)
--tmac
On 8/14/07, Bill Holland hollandwl@gmail.com wrote:
Disk sanitizer is for ONTAP 7x not 6.2.2 and 7x is not available for F740s.
He would have to connect the shelves to a filer running 7x with a sanitizer license
----- Original Message ----- From: tmac To: Bert Kiers Cc: Nils Vogels ; toasters@mathworks.com Sent: Tuesday, August 14, 2007 11:59 AM Subject: Re: Disk content erase on a 740 running 6.2.2.
As I stated in the first reponse of this thread...
et yourself a disk_sanitization license (it is free!) (once installed, you cannot remove)
Boot to the floppy menu. Use the menu to create a 2 disk root volume. When finished, run through the setup. Install your Disk_sanitization license then run the command:
disk sanitize start x.1 x.2 x.3 etc...
This will by default, write 3 patterns: 0x55 0xaa (the compliment of 0x55, 0x55 + 0xaa = 0xff) 0x3c (the 3 is three up and the c is three down, another nice off-setting bit pattern)
I believe it even starts off with a low-level format before the bit patterns.
When complete, I think the disks are move out of the spare pool so you know what is done and what is not.
At this point, you would need to be the federal government, invest lots of money for specialized gear and spend lots of time to get data off the disks.
Why are those bit patterns important?
Disks are magnetic. They are nor absolute 1 or absolute 0. they "lean" towards 1 or "lean" towards 0. If the data has been on the drive long enough, the bits will have a tendancy to "lean a particular" way.
The bit pattern excersize will force the bits one way, then the other: 0x55 = 01010101 0xaa = 10101010 0x3c = 00111100
See the pattern now? These patterns try to reduce the amount of "leaning" going on.
If you want to be sure the data is gone without physical desruction, this is the best way to go. Of course, you can tell the command to use your own bit patterns and/or how many cycles to run.
--tmac
On 8/14/07, Bert Kiers kiersb@xs4all.net wrote:
On Mon, Aug 13, 2007 at 11:33:53PM +0200, Nils Vogels wrote:
Hey Oskar!
On 8/13/07, Oskar Pienkos oskar_pienkos@sfu.ca wrote:
Hello,
I'm decommissioning my old 740 running Ontapp 6.2.2 and would like to wipe the disk content. Any ideas how can I do it?
I'd boot into maintenance mode and choose to reinitialise disks and reinstall ONTAP. On ONTAP versions 7 that's menu choice 4.
How well does this erase the contents? Is it all overwritten? How often? Or is it just a reformat of some kind that only rewrites the meta data?
What does 'disk zero spares' actually do?
One time, when I really needed to be sure the data was gone forever, I reformatted the disks to 512 bps an ran wipe on them ( http://wipe.sourceforge.net/)
TIA,
Bert Kiers XS4All UNIX systeembeheerder, suspected terrorist
-- --tmac
RedHat Certified Engineer #804006984323821
Principal Consultant, RABA Technologies 240-373-3926 (office) 301-688-4705 (Lab) 214-279-3926 (eFAX)
-
Bert Kiers -
Bill Holland -
Chris Thompson -
tmac