Re: access LVM logical volume as disk?

[mlelstv%serpens.de@localhost (Michael van Elst)]

riz%tastylime.net@localhost (Jeff Rizzo) writes:

>Is there any way to get NetBSD 10.1 to treat an LVM logical volume as if 
>it's
>a disk?  Specifically, I can access the gpt on the raw device of the lv
>directly, and it shows:

You can create a ccd device on top of a LV.

# gpt show /dev/mapper/vg0-lvpbulk
      start       size  index  contents
          0          1         PMBR
          1          1         Pri GPT header
          2         32         Pri GPT table
         34  419430333      1  GPT part - NetBSD FFSv1/FFSv2
  419430367         32         Sec GPT table
  419430399          1         Sec GPT header
# ccdconfig ccd0 1 /dev/mapper/vg0-lvpbulk
# gpt show ccd0
      start       size  index  contents
          0          1         PMBR
          1          1         Pri GPT header
          2         32         Pri GPT table
         34  419430333      1  GPT part - NetBSD FFSv1/FFSv2
  419430367         32         Sec GPT table
  419430399          1         Sec GPT header
# gpt ccd0 listwedges
dk19: iqn.2007-09.jp.ne.peach.istgt:pbulk1, 419430333 blocks at 34, type: ffs
# fsck -n -f dk19
** /dev/rdk19 (NO WRITE)
** File system is already clean
** Last Mounted on /mnt
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
264542 files, 345267 used, 51270954 free (138 frags, 6408852 blocks, 0.0% fragmentation)
# mount /dev/dk19 /mnt
# df -h /mnt
Filesystem     Size   Used  Avail %Cap Mounted on
/dev/dk19      197G   1.3G   186G   0% /mnt