You don't state the OS version, so I don't know what tools you may already have to do this for you, and it depends what you want the file for.
There is a way in C that you open a new file, skipping to a huge offset then writing a single character before closing it. That might do the trick but it doesn't initially consume disk space and won't worry you for IO load. That may not be good for what you are trying to test. Additionally, if you restore it or copy it, the target file will be the full size, so that might mean that the filesystem does not restore properly if you suddenly fill it during a restore.
A good way can be to take a tar of a good chunk of disk (any files will do) then append it to itself several times, repeating until you get the desired size. Something like:-
Repeat the last two lines as needed to get a big enough file. If you need to trim it down again, you could perhaps:-
I've made it compress the file (you may prefer gzip) so that it is a true performance test, i.e. it can't be further compressed during transmission etc.
Hello,
I have a excel file which has almost ten columns on the shared drive. I have to write a shell script to ftp that daily to unix server and then extract some columns from there and generate oracle standard text file. The columns should be in proper order and aligned properly, otherwise... (1 Reply)
Hi Scripting Gurus,
I am trying to parse a csv file and generate a new output file.
The input file will be a variable length in turns of rows and columns.
output file will have 8 columns. we have three columns from the header for each set.
just to give little bit more clarification each row... (15 Replies)
I use red hat linux es 5
I use startx to start the x-win desktop.
But when I use vritual manager .
The display application is too large so the bottom
part for the application cannot show out.
I cannot scroll down to get the display of bottm part .
So, I do not know what button display at the... (0 Replies)
Dear Members,
I have a table in Oracle DB and one of its column name is INFO which has data in text format which we need to fetch in a script and create an xml file of a new table from the input.
The contents of a single cell of INFO column is like:
Area:app - aam
Clean Up Criteria:... (0 Replies)
cannot generate .ko file on my linux, although it can generate module.symvers.
But when I copy .c file and Makefile to another linux computer, there's no problem.
The strange thing is: make is successfuly executed, and returned 0;
make output:
make -C /lib/modules/2.6.18-92.el5xen/build ... (4 Replies)
Hi,We have an interface which extracts data from database tables, spool the records into text files, and copy those files using SFTP to a windows server location. The target system loads these files into its database using some DTS packages in SQL Server.
This interface of exporting text files... (13 Replies)
Hi All,
I have a requirement where I need to go to a directory, list all the files that start with person* (for eg) & read the most recent file from the list of files.
While browsing through the forum, i found that the command ls -t will list the files. I am trying to generate the output... (1 Reply)
Hi All,
I am trying to generate a file through a LINUX scripting as shown below
export field1=`cat dir/filename1.txt |wc -l`
echo "field1 : $field1 >>dir/WeeklySummaryReport.txt
export field2=`cat dir/filename2.txt |wc -l`
echo "field2 : $field2 >>dir/WeeklySummaryReport.txt
While... (5 Replies)
Hi All,
I am trying to generate a weekly HTML report using LINUX Scripting. This will have record counts of some files. (like below)
touch path/filename.html
echo "Weekly Summary Report for Business Date : $P_BUS_DT">path/filename.html
export A1=`cat path/filename1.txt |wc -l`
echo "A1... (6 Replies)
hi all i want a script to FTP a file and should generate a quality checksum file
means when I FTP a file from one server to another server it should generate a QC file which should contain timestamp,no.of records in that file
Thanks in advance
saikumar (3 Replies)
Discussion started by: hemanthsaikumar
3 Replies
LEARN ABOUT OSF1
extendfs
extendfs(8) System Manager's Manual extendfs(8)NAME
extendfs - Extends UFS file systems
SYNOPSIS
/sbin/extendfs [- s] [disk_blocks] device_name
DESCRIPTION
Use the extendfs command to increase the storage space in a UFS file system. The file system must not be mounted when you perform this
operation. To extend a mounted (in use) UFS file system, use the mount command with the -o extend option.
The procedure for increasing the storage space of a UFS file system is as follows: Look at the contents the /etc/fstab file to identify the
disk partition that maps to the file system. Ensure that there is available storage space on the target disk as follows: If LSM is in use
on your system, use LSM commands to increase the size of the LSM volume as described in the Logical Storage Manager guide. If LSM is not
in use on your system, use the disklabel command or the diskconfig graphical user interface to check the current size and use of partitions
on the disk. If there is adequate space on an adjacent partition, use the disklabel command to write the current label to a file as fol-
lows: # disklabel -r dsk4 > d4label Edit the disklabel file to change the size of the partition on which your UFS file system resides.
Increase the number of disk blocks on the partition and decrease the disk block size of the adjacent partition by an equivalent number.
Use the disklabel command with the -R option to write the revised label to the raw disk as follows: # disklabel -R /dev/rdisk/dsk4 d4label
When the disk label is revised, extend the file system using the extendfs command. You can either use the full extent of the newly sized
partition or extend the file system in stages. The following example commands show both methods. To extend the file system to use all the
available space, you specify the disk partition on which the file system resides, as follows: # extendfs /dev/disk/dsk4g To extend the
file system to use only part of the available space, you specify a number of disk blocks, as follows: # extendfs -s 300000 /dev/disk/dsk4g
The remainder of the extended partion is reserved for future use.
You can extend a file system as many times as necessary, up to the physical limit of the storage device. When no more space is available
on the storage device, you must back up the file system using the dump command and restore the file system to a storage device that has
more available space.
Once you have extended a file system, the operation cannot be reversed except by a back up and restore operation. Use the dump command to
back up the file system. You can then reset the partition sizes manually and restore the file system to the storage device.
ERRORS
The disklabel command produces output similar to that of the newfs command. If a list of disk blocks is not displayed on the terminal, the
command has failed. Verify the partition settings and the mount status of the target file system.
The disklabel command does not permit you to overwrite a partition if it is in use. Refer to the disklabel(8) reference page for more
information on label errors.
FILES
Specifies the command path.
RELATED INFORMATION diskconfig(8), disklabel(8), mount(8), and fstab(4).
extendfs(8)