[clue] Dumb disk question
David L. Willson
DLWillson at TheGeek.NU
Mon Oct 26 12:20:36 MDT 2015
file -s (some-block-device)
... is very cool, Dan. Here's the log of my "trying it later".
[dlwillson at nb-willson-7 ~]$ file --help
Usage: file [OPTION...] [FILE...]
Determine type of FILEs.
...
-r, --raw don't translate unprintable chars to \ooo
-s, --special-files treat special (block/char devices) files as
ordinary ones
-C, --compile compile file specified by -m
...
Report bugs to http://bugs.gw.com/
[dlwillson at nb-willson-7 ~]$ sudo file -s /dev/sda1
/dev/sda1: SGI XFS filesystem data (blksz 4096, inosz 256, v2 dirs)
[dlwillson at nb-willson-7 ~]$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 447.1G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 446.7G 0 part
├─cl-root 253:0 0 50G 0 lvm /
├─cl-swap 253:1 0 7.9G 0 lvm [SWAP]
└─cl-home 253:2 0 388.7G 0 lvm /home
sdb 8:16 0 465.8G 0 disk
└─sdb1 8:17 0 465.8G 0 part
└─shared-lv_stuph 253:3 0 410.6G 0 lvm /stuph
sr0 11:0 1 1024M 0 rom
[dlwillson at nb-willson-7 ~]$ sudo file -s /dev/sda2
[sudo] password for dlwillson:
/dev/sda2: LVM2 PV (Linux Logical Volume Manager), UUID: TslZ5N-ikNa-zMgC-Lo0s-9bMv-RfxZ-2r5v2D, size: 479577767936
[dlwillson at nb-willson-7 ~]$ sudo file -s /dev/mapper/cl-root
/dev/mapper/cl-root: symbolic link to `../dm-0'
[dlwillson at nb-willson-7 ~]$ sudo file -s /dev/dm-0
/dev/dm-0: SGI XFS filesystem data (blksz 4096, inosz 256, v2 dirs)
[dlwillson at nb-willson-7 ~]$ sudo file -s /dev/mapper/cl-swap
/dev/mapper/cl-swap: symbolic link to `../dm-1'
[dlwillson at nb-willson-7 ~]$ sudo file -s /dev/dm-1
/dev/dm-1: Linux/i386 swap file (new style), version 1 (4K pages), size 2064383 pages, no label, UUID=eccf1ecc-5f1c-44ce-8e28-036e8930860f
[dlwillson at nb-willson-7 ~]$
--
David L. Willson
Teacher, Engineer, Evangelist
RHCE+Satellite CCAH Network+ A+ Linux+ LPIC-1 Ubuntu_CP SUSE_CLA
Mobile 720-333-LANS(5267)
http://sofree.us
This is a good time for a r3VOLution.
----- Original Message -----
> Cool! Trying that later.
> Sent from my Verizon Wireless 4G LTE smartphone
> -------- Original message --------
> From: Dan Kulinski <daniel at kulinski.net>
> Date: 10/23/2015 4:39 PM (GMT-07:00)
> To: CLUE's mailing list <clue at cluedenver.org>
> Subject: Re: [clue] Dumb disk question
> If you do want to see if there is a file system directly on the block
> device, try file -s /dev/sdb. This will look for the magic number in
> common locations. I just learned this because I knew how the file
> command worked on files and wondered if it knew about file systems.
> Sure enough, it does!
> On Fri, Oct 23, 2015 at 4:35 PM, Dan Kulinski < daniel at kulinski.net >
> wrote:
> > Do you know what type of file system it is supposed to be? If there
> > is no partition table then the file system should be taking up the
> > whole device. The way you limit the size of a file system,
> > generally, is to create a partition.
>
> > On Fri, Oct 23, 2015 at 4:30 PM, foo7775 < foo7775 at comcast.net >
> > wrote:
>
> > > Hey all, first off, I am _very_ aware that this is a
> > > painfully-basic
> > > question, but this has been a rough week, so please bear with
> > > me...
> >
>
> > > I've been searching for this info for a while now, but my
> > > very-tired
> > > brain doesn't appear to be able to format the search terms
> > > appropriately. What I'm wanting to do is to confirm that a
> > > defined
> > > disk (/dev/sdb in this case) is essentially "a raw partition" &
> > > doesn't have any data on it. If I can confirm that, then I can
> > > create the needed partitions/filesystems & turn it over to the
> > > customer. The 'fdisk' utility shows me this:
> >
>
> > > Disk /dev/sdb: 214.7 GB, 214748364800 bytes
> >
>
> > > 255 heads, 63 sectors/track, 26108 cylinders
> >
>
> > > Units = cylinders of 16065 * 512 = 8225280 bytes
> >
>
> > > Sector size (logical/physical): 512 bytes / 512 bytes
> >
>
> > > I/O size (minimum/optimal): 512 bytes / 512 bytes
> >
>
> > > Disk identifier: 0x00000000
> >
>
> > > Now I can tell that it doesn't contain any partitions on it (i.e.
> > > sdb1, sdb2, etc.), but I just can't seem to remember how to
> > > confirm
> > > that it isn't formatted as a single big partition. I'd be
> > > grateful
> > > if someone could refresh my memory on this...
> >
>
> > > Thanks,
> >
>
> > > T.
> >
>
> > > Avast logo
> >
>
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> > > software.
> >
>
> > > www.avast.com
> >
>
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>
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