Ron Johnson wrote:
<div class="moz-text-flowed" style="font-family: -moz-fixed">(Please
don't top-post.)
On 12/20/08 18:18, Bhasker C V wrote:
Hi,
hdparm -r1 /dev/sda
works and I get this output when I read back the information with
plain '-r'
$ sudo hdparm -r /dev/sda
/dev/sda:
readonly = 1 (on)
Does this make it really read-only ?
That's what happens on my Firewire/SATA hard drive.
# hdparm -r1 /dev/sdc1
/dev/sdc1:
setting readonly to 1 (on)
readonly = 1 (on)
# mount -v /data/02
mount: block device /dev/sdc1 is write-protected, mounting read-only
/dev/sdc1 on /data/02 type ext3 (ro)
# dd count=10 if=/dev/hda1 of=/data/02/foo.bar
dd: opening `/data/02/foo.bar': Read-only file system
My harddisk is having a PV and then a VG ... LV which if i mount,
still is able to write to it ? [ VG activation is successful ]
(dont know if 'write' means really write a large file but I checked
using touch command and I am still able to create the file)
My kernel is 2.6.21.1
Is there anything I am missing here ?
Since you've got so many layers logicalness between the app and the
spindles, maybe you aren't really writing to the spindle you think you
are writing to? Or LVM is setting the read flag?
I tried this too ... But i am sure that the data is getting written to
be spindle. I deactivated the usb drive and then re-activated the VG and
LVs in it and could see the data writeen intact !
So, my guess is that hdparm -r1 does not work on USB scanned devices and
there is no method to make the device read-only [unless we try to stick
out head into the physical hardware ] ? Is that what we are concluding ?
Ron Johnson wrote:
<div class="moz-text-flowed" style="font-family: -moz-fixed">On
12/20/08 12:32, Bhasker C V wrote:
Hi all,
I have a server where there is a USB SCSI disk with lots of
important data.
The only problem is accidentally people try to understand some other
similar ide-scsi disk (sdb may be) as the
first one (sda) and delete data.
I was going to find out if there is any method so that I can make a
disk (a particular device) read-only. i.e in case
I insert this disk with very important data, I must be able to make
this disk (may be scanned as sdX) as readonly
so that people are only able to see the partition, mount it and use
it ratherthan try to accidentally delete data which
will result in disk reporting it as read-only
[ PS: I am not referring a workaround of mouting a partition
read-only which can still help, but i want the whole disk
to be made read-only ]
# hdparm -r
You might have to crack open the USB enclosure and physically install
the drive in a PC in order for this to work.
--
Bhasker C V
Registered Linux user: #306349 (counter.li.org)
The box said "Requires Windows 95, NT, or better", so I installed Linux.
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