Re: Experiments with sswap(1), srm(1), wipe(1), gdisk(8), lsblk and gpart(8)
- Reply: Graham Perrin : "gdisk(8) and geli(8)"
- In reply to: Graham Perrin : "Experiments with sswap(1), srm(1), wipe(1), gdisk(8), lsblk and gpart(8)"
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Date: Sat, 28 Aug 2021 13:50:20 UTC
> … I'll report what might be an obscure bug in lsblk.
Fixed but not yet in ports:
<https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258090#c9>
…
> Lines 131–139, gdisk should have added freebsd-swap at /dev/da0p3, I
> ignored the suggestion to remove the hard disk drive ("Warning: The
> kernel may continue to use old or deleted partitions."), gpart then
> showed nothing (free space) where da0p3 was expected.
…
> Lines 288–297, gdisk should have deleted /dev/da0p3, I ignored the
> suggestion to remove the drive, lsblk showed da0p3 still present.
…
Today:
* sysctl kern.geom.debugflags=16
was not required
* things were as expected following each run of gdisk,
ignoring the warnings about the kernel continuing to use
old or deleted partitions.
<https://www.rodsbooks.com/gdisk/> puts kern.geom.debugflags=16 in
context. I'm not sure why it was required yesterday.
----
# /usr/home/grahamperrin/dev/lsblk/lsblk da4
DEVICE MAJ:MIN SIZE TYPE
LABEL MOUNT
da4 2:115 466G GPT
- -
da4p1 2:116 200M efi msdosfs/EFISYS -
da4p2 2:117 512K freebsd-boot gpt/gptboot0 -
da4p3 2:118 16G freebsd-swap gpt/FreeBSD%20swap -
da4p4 2:119 450G freebsd-zfs
gpt/zfs0 <ZFS>
<FREE> -:- 4.0K - - -
# srm -lv /dev/da4p3
Using /dev/urandom for random input.
Wipe mode is insecure (two passes [0xff/random])
Wiping /dev/da4p3 Warning: /dev/da4p3 is not a regular file,
rename/unlink only!Warning: Couldn't rename /dev/da4p3 - Operation not
supported
Removed file /dev/da4p3 ... Done
# sysctl sysctl kern.geom.debugflags
kern.geom.debugflags: 0
# gdisk /dev/da4
GPT fdisk (gdisk) version 1.0.8
Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present
Found valid GPT with protective MBR; using GPT.
Command (? for help): d
Partition number (1-4): 3
Command (? for help): w
Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!
Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/da4.
Warning: The kernel may continue to use old or deleted partitions.
You should reboot or remove the drive.
The operation has completed successfully.
# /usr/home/grahamperrin/dev/lsblk/lsblk da4
DEVICE MAJ:MIN SIZE TYPE
LABEL MOUNT
da4 2:115 466G GPT
- -
da4p1 2:116 200M efi msdosfs/EFISYS -
da4p2 2:117 512K freebsd-boot gpt/gptboot0 -
<FREE> -:- 16G - - -
da4p4 2:118 450G freebsd-zfs
gpt/zfs0 <ZFS>
<FREE> -:- 4.0K - - -
# gdisk /dev/da4
GPT fdisk (gdisk) version 1.0.8
Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present
Found valid GPT with protective MBR; using GPT.
Command (? for help): n
Partition number (3-128, default 3):
First sector (410664-976773127, default = 410664) or {+-}size{KMGTP}:
Last sector (410664-33966079, default = 33966079) or {+-}size{KMGTP}:
Current type is A503 (FreeBSD UFS)
Hex code or GUID (L to show codes, Enter = A503): a502
Changed type of partition to 'FreeBSD swap'
Command (? for help): w
Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!
Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/da4.
Warning: The kernel may continue to use old or deleted partitions.
You should reboot or remove the drive.
The operation has completed successfully.
# /usr/home/grahamperrin/dev/lsblk/lsblk
DEVICE MAJ:MIN SIZE TYPE
LABEL MOUNT
ada0 0:121 932G GPT
- -
ada0p1 0:123 260M efi gpt/efiboot0 -
<FREE> -:- 1.0M - - -
ada0p2 0:125 16G freebsd-swap
gpt/swap0 SWAP
ada0p2.eli 2:76 16G freebsd-swap
- SWAP
ada0p3 0:127 915G freebsd-zfs
gpt/zfs0 <ZFS>
ada0p3.eli 0:135 915G zfs - -
<FREE> -:- 708K - - -
da4 2:115 466G GPT
- -
da4p1 2:116 200M efi msdosfs/EFISYS -
da4p2 2:117 512K freebsd-boot gpt/gptboot0 -
da4p3 2:118 16G freebsd-swap gpt/FreeBSD%20swap -
da4p4 2:119 450G freebsd-zfs
gpt/zfs0 <ZFS>
<FREE> -:- 4.0K - - -
da5 0:209 466G GPT
- -
<FREE> -:- 1.0M - - -
da5p1 0:210 466G freebsd-zfs
gpt/Transcend <ZFS>
da6 0:217 14G GPT
- -
<FREE> -:- 1.0M - - -
da6p1 0:218 14G freebsd-zfs
gpt/cache-transcend <ZFS>
da7 0:239 29G GPT
- -
da7p1 0:240 29G freebsd-zfs
gpt/cache-august <ZFS>
# gpart show
=> 40 1953525088 ada0 GPT (932G)
40 532480 1 efi (260M)
532520 2008 - free - (1.0M)
534528 33554432 2 freebsd-swap (16G)
34088960 1919434752 3 freebsd-zfs (915G)
1953523712 1416 - free - (708K)
=> 34 976773101 da5 GPT (466G)
34 2014 - free - (1.0M)
2048 976771087 1 freebsd-zfs (466G)
=> 34 30310333 da6 GPT (14G)
34 2014 - free - (1.0M)
2048 30308319 1 freebsd-zfs (14G)
=> 34 60437425 da7 GPT (29G)
34 60437425 1 freebsd-zfs (29G)
=> 40 976773088 da4 GPT (466G)
40 409600 1 efi (200M)
409640 1024 2 freebsd-boot (512K)
410664 33555416 3 freebsd-swap (16G)
33966080 942807040 4 freebsd-zfs (450G)
976773120 8 - free - (4.0K)
# /usr/local/sbin/lsblk
DEVICE MAJ:MIN SIZE TYPE
LABEL MOUNT
ada0 0:121 932G GPT
- -
ada0p1 0:123 260M efi gpt/efiboot0 -
<FREE> -:- 1.0M - - -
ada0p2 0:125 16G freebsd-swap
gpt/swap0 SWAP
ada0p2.eli 2:76 16G freebsd-swap
- SWAP
ada0p3 0:127 915G freebsd-zfs
gpt/zfs0 <ZFS>
ada0p3.eli 0:135 915G zfs - -
<FREE> -:- 708K - - -
cd0 0:129 0B -
- -
da0 2:105 0B freebsd-swap
- SWAP
da1 2:107 0B -
- -
da2 2:108 0B -
- -
da3 2:109 0B -
- -
da4 2:115 466G GPT
- -
da4p1 2:116 200M efi msdosfs/EFISYS -
da4p2 2:117 512K freebsd-boot gpt/gptboot0 -
da4p3 2:118 16G freebsd-swap gpt/FreeBSD%20swap -
da4p4 2:119 450G freebsd-zfs
gpt/zfs0 <ZFS>
<FREE> -:- 4.0K - - -
da5 0:209 466G GPT
- -
<FREE> -:- 1.0M - - -
da5p1 0:210 466G freebsd-zfs
gpt/Transcend <ZFS>
da6 0:217 14G GPT
- -
<FREE> -:- 1.0M - - -
da6p1 0:218 14G freebsd-zfs
gpt/cache-transcend <ZFS>
da7 0:239 29G GPT
- -
da7p1 0:240 29G freebsd-zfs
gpt/cache-august <ZFS>
#