Re: Can I install NetBSD on the same usb installation disk?

[Ottavio Caruso <ottavio2006-degen%yahoo.com@localhost>]

On 24 November 2017 at 18:33, Chavdar Ivanov <ci4ic4%gmail.com@localhost> wrote:
> ## Writing the installation image onto an 8GB USB stick
> ##
> ~sysbuild/release/images # dd if=NetBSD-8.99.7-amd64-install.img ibs=64k | \
> progress -l $(ls -l NetBSD-8.99.7-amd64-install.img | awk '{print $5}'
> ) dd of=/dev/rsd0d obs=64k
>  99% |*****************************************  |  1447 MiB    7.95
> MiB/s    00:00 ETA23200+0 records in
> 2969600+0 records out
> 1520435200 bytes transferred in 182.347 secs (8338142 bytes/sec)
> 2969600+0 records in
> 23200+0 records out
> 1520435200 bytes transferred in 182.345 secs (8338233 bytes/sec)
> 100% |****************************************|  1450 MiB    7.95
> MiB/s    00:00 ETA
>
> ## Checking the disklabel and verifying the a slice is as small as expected....
> ##
> ~sysbuild/release/images # disklabel sd0
> # /dev/rsd0:
> type: ESDI
> disk: image
> label:
> flags:
> bytes/sector: 512
> sectors/track: 32
> tracks/cylinder: 64
> sectors/cylinder: 2048
> cylinders: 1450
> total sectors: 2969600
> rpm: 3600
> interleave: 1
> trackskew: 0
> cylinderskew: 0
> headswitch: 0           # microseconds
> track-to-track seek: 0  # microseconds
> drivedata: 0
>
> 8 partitions:
> #        size    offset     fstype [fsize bsize cpg/sgs]
>  a:   2967552      2048     4.2BSD   1024  8192    16  # (Cyl.      1 -   1449)
>  c:   2967552      2048     unused      0     0        # (Cyl.      1 -   1449)
>  d:   2969600         0     unused      0     0        # (Cyl.      0 -   1449)
> ~sysbuild/release/images # mount /dev/sd0a /mnt/a
> ~sysbuild/release/images # df -k /mnt/a
> Filesystem    1K-blocks       Used      Avail %Cap Mounted on
> /dev/sd0a       1459950     690844     696110  49% /mnt/a
>
> ~sysbuild/release/images # umount /mnt/a
>
> ## Using fdisk to extend the NetBSD primamry partition to the end of
> the disk - notice the '$' on the 'size:' row
> ##
>
> ~sysbuild/release/images # fdisk -u sd0
> Disk: /dev/rsd0
> NetBSD disklabel disk geometry:
> cylinders: 7680, heads: 64, sectors/track: 32 (2048 sectors/cylinder)
> total sectors: 15728640, bytes/sector: 512
>
> BIOS disk geometry:
> cylinders: 980, heads: 255, sectors/track: 63 (16065 sectors/cylinder)
> total sectors: 15728640
>
> Partitions aligned to 2048 sector boundaries, offset 2048
>
> Do you want to change our idea of what BIOS thinks? [n]
>
> Partition table:
> 0: NetBSD (sysid 169)
>     start 2048, size 2967552 (1449 MB, Cyls 0-184/216/32), Active
> 1: <UNUSED>
> 2: <UNUSED>
> 3: <UNUSED>
> Bootselector disabled.
> First active partition: 0
> Drive serial number: 0 (0x00000000)
> Which partition do you want to change?: [none] 0
> The data for partition 0 is:
> NetBSD (sysid 169)
>     start 2048, size 2967552 (1449 MB, Cyls 0-184/216/32), Active
> sysid: [0..255 default: 169]
> start: [0..979cyl default: 2048, 0cyl, 1MB]
> size: [0..979cyl default: 2967552, 185cyl, 1449MB] $
> bootmenu: [] (space to clear)
>
> Partition table:
> 0: NetBSD (sysid 169)
>     start 2048, size 15726592 (7679 MB, Cyls 0-979/15/60), Active
> 1: <UNUSED>
> 2: <UNUSED>
> 3: <UNUSED>
> Bootselector disabled.
> First active partition: 0
> Drive serial number: 0 (0x00000000)
> Which partition do you want to change?: [none]
>
> We haven't written the MBR back to disk yet.  This is your last chance.
> Partition table:
> 0: NetBSD (sysid 169)
>     start 2048, size 15726592 (7679 MB, Cyls 0-979/15/60), Active
> 1: <UNUSED>
> 2: <UNUSED>
> 3: <UNUSED>
> Bootselector disabled.
> First active partition: 0
> Drive serial number: 0 (0x00000000)
> Should we write new partition table? [n] y
> ##
> ## Our NetBSD partition went from 1449 to 7679 MB - above
> ##
> ## But of course the a slice is the same
> ##
> ~sysbuild/release/images # mount /dev/sd0a /mnt/a
> ~sysbuild/release/images # df -k /mnt/a
> Filesystem    1K-blocks       Used      Avail %Cap Mounted on
> /dev/sd0a       1459950     690844     696110  49% /mnt/a
> ~sysbuild/release/images # umount /mnt/a
>
>
> ## Extending the A slice
> ##
> ~sysbuild/release/images # disklabel -i sd0
> Enter '?' for help
> partition>A                     <------- that makes the NetBSD
> partition cover the whole disk
> Adjust disklabel sector from 2969600 to 15728640 [n]? y
> partition>P                     <------- No change here still
> 8 partitions:
> #        size    offset     fstype [fsize bsize cpg/sgs]
>  a:   2967552      2048     4.2BSD   1024  8192    16  # (Cyl.      1 -   1449)
>  c:  15726592      2048     unused      0     0        # (Cyl.      1 -   7679)
>  d:   2969600         0     unused      0     0        # (Cyl.      0 -   1449)
> partition>a                     <----- Work on 'a'
> Filesystem type [4.2BSD]:
> Start offset ('x' to start after partition 'x') [1c, 2048s, 1M]:
> Partition size ('$' for all remaining) [1449c, 2967552s, 1449M]: $
> <---- extend 'a' to the max
>  a:  15726592      2048     4.2BSD   1024  8192    16  # (Cyl.      1 -   7679)
> partition>P                    <------- see below the augmented sizes
> 8 partitions:
> #        size    offset     fstype [fsize bsize cpg/sgs]
>  a:  15726592      2048     4.2BSD   1024  8192    16  # (Cyl.      1 -   7679)
>  c:  15726592      2048     unused      0     0        # (Cyl.      1 -   7679)
>  d:   2969600         0     unused      0     0        # (Cyl.      0 -   1449)
> partition>W                <--------- write it down
> Label disk [n]?y
> Label written
> partition>Q                <--------- get out
>
> ~sysbuild/release/images # fsck -fy /dev/rsd0a     <----- just in case
> ** /dev/rsd0a
> ** File system is already clean
> ** Last Mounted on /mnt/a
> ** Phase 1 - Check Blocks and Sizes
> ** Phase 2 - Check Pathnames
> ** Phase 3 - Check Connectivity
> ** Phase 4 - Check Reference Counts
> ** Phase 5 - Check Cyl groups
> 11270 files, 345422 used, 384553 free (1 frags, 48069 blocks, 0.0%
> fragmentation)
> ~sysbuild/release/images # resize_ffs -y /dev/rsd0a    <----- really extend 'a'
> ~sysbuild/release/images # fsck -fy /dev/rsd0a         <----- that is needed
> ** /dev/rsd0a
> ** File system is already clean
> ** Last Mounted on /mnt/a
> ** Phase 1 - Check Blocks and Sizes
> ** Phase 2 - Check Pathnames
> ** Phase 3 - Check Connectivity
> ** Phase 4 - Check Reference Counts
> ** Phase 5 - Check Cyl groups
> 11270 files, 345422 used, 3523721 free (1 frags, 440465 blocks, 0.0%
> fragmentation)
> ~sysbuild/release/images # mount /dev/sd0a /mnt/a       #### test the
> new partition size
> ~sysbuild/release/images df -k /mnt/a
> Filesystem    1K-blocks       Used      Avail %Cap Mounted on
> /dev/sd0a       7738286     690844    6660528   9% /mnt/a        <----
> looks good
>
> Boot from this stick was also tested OK.
>
> Obviously you can use the same technique to extend your 'a' slice and
> extend and|or relocate your 'b'
> swap slice on a live stick/disk. Also if you wanted, instead of
> increasing the NetBSD primary
> partition with fdisk at the beginning, you could create an MS-DOS
> partition, format it FAT32 and use
> it for other stuff.
>
> This was lifted some times ago from the NetBSD Raspberry PI wiki.
>
> Chavdar Ivanov
>

Thanks Chavdar!

A lot of food for thought!


-- 
Ottavio Caruso