04-28-2008
Tape drive?
Block size = 0 means variable / OS default.
What type of drive / device?
Do you have the correct device driver filesets loaded?
10 More Discussions You Might Find Interesting
1. Filesystems, Disks and Memory
Hi,
Somehow i have forgotten a comand that displays me the block size of the unix filesystem. Can someone letme know this command
regards
penguin (5 Replies)
Discussion started by: linuxpenguin
5 Replies
2. Filesystems, Disks and Memory
AIX 4.3.3
How can I find the os block size?
How can I change the OS Block Size?
When and where does the os block size get set?
I am running oracle 8.1.7 and am under the impression I need to set my os block size = oracle block size which is 8k.
Any insight on this would be... (1 Reply)
Discussion started by: kburrows
1 Replies
3. Solaris
how do you determine block size for a file system? In solaris 5.8 (3 Replies)
Discussion started by: csaunders
3 Replies
4. UNIX for Dummies Questions & Answers
Hello Unix guru's
I want to check my OS Block size for the Solaris 8
Following is one of the line from df -g command.
Can anybody help to interpret the same.
/u03 (/dev/vx/dsk/oradg/vol03): 8192 block size 8192 frag size
205463552 total blocks 50433792... (1 Reply)
Discussion started by: Dilippatel
1 Replies
5. Shell Programming and Scripting
i wrote this code to figure if two identical directories on different devices one on a partition and one on a loop had the same total size for -size +0 file only in recrusive tree form.:
awk '$1 ~ /^-/{total=i;i<=NR;i+=$5;print $0}END{print total}'
file1.... .
the output of du -hb was slightly... (2 Replies)
Discussion started by: moxxx68
2 Replies
6. UNIX for Dummies Questions & Answers
If I execute this command:
$ ls -lt | awk '{print $5}' | sort -nr |head -1
it returns the following value
57441881
If I execute this command:
$ ls -s | sort -nr | head -1 | cut -d" " -f1
it returns the same file but now in block size
112208
Is there... (1 Reply)
Discussion started by: mh53j_fe
1 Replies
7. UNIX for Dummies Questions & Answers
Hi All,
drwxr-xr-x 2 root root 4096 May 31 14:47 test
Please let me know here 4096 indicating what?
Thanks & Regards,
Bache (1 Reply)
Discussion started by: bache_gowda
1 Replies
8. UNIX for Advanced & Expert Users
Hello,
in one default UFS filesystem we have 8K block size (bsize) and 1K fragmentsize (fsize). At this scenary I thought all "FileSytem IO" will be 8K (or greater) but never smaller than the fragment size (1K). If a UFS fragment/blocksize is allwasy several ADJACENTS sectors on disk (in a ... (4 Replies)
Discussion started by: rarino2
4 Replies
9. Red Hat
Hi Guys,
I am running Linux 2.6.18-164.el x86_64 how do i check the block size?
Thanks in advance... (1 Reply)
Discussion started by: Phuti
1 Replies
10. HP-UX
Accordingly a lot of manuals - if you have block size 8KB and trying to write a 1KB file to the block, as result you waste 7KB of the block space. But recently I noticed about Fragments of File Block. In same case if you have File Block 8KB and Fragment size 1KB - you can save your block space,... (6 Replies)
Discussion started by: jess_t03
6 Replies
MT(1) General Commands Manual MT(1)
NAME
mt - magnetic tape control
SYNOPSIS
mt [-f device] [count]
DESCRIPTION
Mt is a user interface to the magnetic tape commands described in mtio(4). It allows one to space a tape forwards or backwards, write end
of file markers, etc.
With the -f option a tape device can be named, otherwise the environment variable TAPE is used if set, otherwise the default device
/dev/nrst4 is assumed. Standard input is used if the tape name is a dash (-). The count argument is used to tell how many blocks or files
to space or how many file markers to write. It may be a C-style decimal, octal or hexadecimal constant, by default "1".
Command is the action to perform, it may be one of the following, or any unambiguous prefix (like st for status):
eof, weof Write count end-of-file markers.
fsf Forward space count file markers.
fsr Forward space count records. (The size of a record depends on the tape, and may even be variable, depending on the size of
the writes.)
bsf Backwards space count files. The count may be zero to backspace to the start of the current file. (A tape device need not
support backwards movement, or may be very slow doing it. Rewinding and forward spacing may be better.)
bsr Backwards space count records. The tape is positioned after the last block of the previous file if you hit a filemark when
spacing backwards. The block count is set to -1 to indicate that the driver has no idea where it is on the previous file.
eom Forward space to the end of media.
rewind Rewind the tape.
offline, rewoffl
Rewind and take offline. This may cause some drives to eject the tape.
status Shows the status of the drive, the sense key of the last SCSI error, current file number, current record number, residual
count if the last command that encountered end-of-file, and the current block size.
retension Removes tape tension by winding and rewinding the tape completely.
erase Erases the tape completely and rewinds it.
density Sets the density code to read or write the tape to count. Density codes supported depend on the drive. This command need
not be used if the drive senses the proper density on read and can only write one density.
blksize, blocksize
Sets the block size used to read or write the tape to count. This command may be used to select a fixed block size for a
variable block size tape. This will speed up I/O for small block sizes. Use a zero count to use variable sized blocks
again.
ENVIRONMENT
TAPE Tape drive to use if set.
FILES
/dev/nrst4 Default tape device.
SEE ALSO
mtio(4), st(4).
AUTHOR
Kees J. Bot (kjb@cs.vu.nl)
MT(1)