The Information Systems and Computer Applications examination covers material that is usually taught in an introductory college-level business information systems course.

Archive for August, 2015

JAPO complete

My Little Posterous (ScIeNtIfIc DiSsEmInAtIoN)

I have now reviewed every release in the JAPO catalogue. Shout outs to Craig LeHoullier, Steve Lake, and Bernd Webler for helping make my JAPO listening complete!

Any of you regular readers out there might have noticed that I recently reviewed the two latest XtraWATT albums. These stand as my backward entry into ECM’s other sub-labels. I do, of course, plan to also explore WATT and CARMO in full on this site, although such reviews may be sporadic, mixed in as they will be with the most up-to-date ECMs, along with albums from farther afield.

Below is a list of all JAPO releases, hyperlinked to my reviews for your convenience.

JAPO 60001 Mal Waldron The Call (Feb 1971)
JAPO 60002 Abdullah Ibrahim African Piano (Oct 1969)
JAPO 60003 Barre Phillips For All It Is (Mar 1971)
JAPO 60004 Herbert Joos The Philosophy of the Fluegelhorn (Jul…

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Tamaño de un disco (fdisk vs lsblk)

systemadmin.es by Jordi Prats

Si comparamos los tamaños que reportan las herramientas fdisk y lsblk veremos que difiere el tamaño

Por ejemplo, mediante fdisk vemos 10.7GB:

# fdisk -l /dev/sdg

Disk /dev/sdg: 10.7 GB, 10737418240 bytes
64 heads, 32 sectors/track, 10240 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xf921660d

   Device Boot      Start         End      Blocks   Id  System
/dev/sdg1               1       10240    10485744   8e  Linux LVM

Mientras que lsblk nos reporta 10G clavados:

# lsblk /dev/sdg
NAME                    MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdg                       8:96   0  10G  0 disk 
└─sdg1                    8:97   0  10G  0 part 
  └─vg0-LogVol01 (dm-1) 253:1    0  28G  0 lvm  /var

Si partimos de los bytes reportados en el /proc/partitions:

# cat /proc/partitions 
major minor  #blocks  name

(...)
   8       96   10485760 sdg
   8       97   10485744 sdg1

Haciendo los cálculos podemos ver que la diferencia entre las dos herramientas son las unidades:

# echo "10737418240/1024/1024/1024" | bc -l
10.00000000000000000000
# echo "10737418240/1000/1000/1000" | bc -l
10.73741824000000000000

En el caso de lsblk esta usando Gigabytes (base 10) mientras que fdisk esta usando Gibibytes (potencias de 2)

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Tamaño de un disco (fdisk vs lsblk) was first posted on August 6, 2015 at 9:01 am.