01-16-2019
Quote:
Originally Posted by
jlliagre
fdisk is reporting 512 bytes sectors but nowadays, disks have 4096 bytes sectors.
The discrepancy between the available size (1172107117 x 512 bytes sectors) and the amount actually used (1172107151 x 512 bytes sectors) is 34 sectors, i.e. 4.25 (sic) actual sectors.
So you have 0.0000029 % of the disk unusable due to rounding errors. No big deal.
Hi jlliagre,
Thanks for taking this up.
q1) what do you mean by "4.25 (sic) actual sectors." ? Where the 4.25 ?
q2) 1172107151 > did you count from 0 to 1172107150 ? (as the partition starts from 256 -> probably due to alignment set by Oracle)
Regards,
Noob
8 More Discussions You Might Find Interesting
1. Solaris
First post :) ...
Here is a script for automatic labeling of previously unlabeled disks.
Other methods exist (format -f cmd_file), but I like this because it's all in one place.
#!/bin/ksh
#----------------------
# format_label
# Automatic labeling of previously unlabeled disks
#... (1 Reply)
Discussion started by: kwachtler
1 Replies
2. Filesystems, Disks and Memory
Is there a way to determine the number of available spare sectors on a disk ? as it may be useful for notifying a user to take a backup of the disk before it runs into a medium error. (6 Replies)
Discussion started by: rednex
6 Replies
3. Shell Programming and Scripting
Hello, I need advice on how to check if started processes are finished in perl, here's explanation :
OS is RHEL 4, perl -v = "This is perl, v5.8.0 built for i386-linux-thread-multi"
The logic of the script :
#!/usr/bin/perl
use warnings;
$param1 = $ARGV;
$param2 = $ARGV;
$param3 =... (2 Replies)
Discussion started by: sysgate
2 Replies
4. Filesystems, Disks and Memory
I found a document: Bad block HOWTO for smartmontools
My hard drive is Maxtor:
root]# fdisk -lu /dev/hda
Disk /dev/hda: 81.9 GB, 81964302336 bytes
255 heads, 63 sectors/track, 9964 cylinders, total 160086528 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x3f4e3f4d
... (0 Replies)
Discussion started by: justinian
0 Replies
5. Linux
Hi all,
I'm kind of new to programming in Linux & c/c++. I'm currently writing a FileManager using Ubuntu Linux(10.10) for Learning Purposes. I've got started on this project by creating a loopback device to be used as my virtual hard disk. After creating the loop back hard disk and mounting it... (23 Replies)
Discussion started by: shen747
23 Replies
6. Boot Loaders
i'm writing some code to simulate the boot progress after power on
but when i try to read the 2nd sector from a floppy disk, this operation always fail with ah=0x80h which means timeout, how can i get over this problem?
my code would be like this:
$ cat boot.S
.code16
#define SETUPLEN 4... (0 Replies)
Discussion started by: wljackhero
0 Replies
7. Linux
i'm writing some code to simulate the boot progress after power on
but when i try to read the 2nd sector from a floppy disk, this operation always fail with ah=0x80h which means timeout, how can i get over this problem?
my code would be like this:
$ cat boot.S
.code16
#define SETUPLEN 4... (0 Replies)
Discussion started by: wljackhero
0 Replies
8. UNIX for Advanced & Expert Users
i'm writing some code to simulate the boot progress after power on
but when i try to read the 2nd sector from a floppy disk, this operation always fail with ah=0x80h which means timeout, how can i get over this problem?
my code would be like this:
$ cat boot.S
.code16
#define SETUPLEN 4... (0 Replies)
Discussion started by: wljackhero
0 Replies
LEARN ABOUT MOJAVE
blockdev
BLOCKDEV(8) System Administration BLOCKDEV(8)
NAME
blockdev - call block device ioctls from the command line
SYNOPSIS
blockdev [-q] [-v] command [command...] device [device...]
blockdev --report [device...]
blockdev -h|-V
DESCRIPTION
The utility blockdev allows one to call block device ioctls from the command line.
OPTIONS
-q Be quiet.
-v Be verbose.
--report
Print a report for the specified device. It is possible to give multiple devices. If none is given, all devices which appear in
/proc/partitions are shown. Note that the partition StartSec is in 512-byte sectors.
-h, --help
Display help text and exit.
-V, --version
Print version and exit.
COMMANDS
It is possible to give multiple devices and multiple commands.
--flushbufs
Flush buffers.
--getalignoff
Get alignment offset.
--getbsz
Print blocksize in bytes.
--getdiscardzeroes
Get discard zeroes support status.
--getfra
Get filesystem readahead in 512-byte sectors.
--getiomin
Get minimum I/O size.
--getioopt
Get optimal I/O size.
--getmaxsect
Get max sectors per request
--getpbsz
Get physical block (sector) size.
--getra
Print readahead (in 512-byte sectors).
--getro
Get read-only. Print 1 if the device is read-only, 0 otherwise.
--getsize64
Print device size in bytes.
--getsize
Print device size (32-bit!) in sectors. Deprecated in favor of the --getsz option.
--getss
Print logical sector size in bytes - usually 512.
--getsz
Get size in 512-byte sectors.
--rereadpt
Reread partition table
--setbsz bytes
Set blocksize. Note that the block size is specific to the current file descriptor opening the block device, so the change of block
size only persists for as long as blockdev has the device open, and is lost once blockdev exits.
--setfra sectors
Set filesystem readahead (same like --setra on 2.6 kernels).
--setra sectors
Set readahead (in 512-byte sectors).
--setro
Set read-only. The currently active access to the device may not be affected by the change. For example filesystem already mounted
in read-write mode will not be affected. The change applies after remount.
--setrw
Set read-write.
AUTHOR
blockdev was written by Andries E. Brouwer and rewritten by Karel Zak.
AVAILABILITY
The blockdev command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.
util-linux August 2010 BLOCKDEV(8)