Linux FileSystem Internal Buffer size: Post: 302239473

9 More Discussions You Might Find Interesting

1. Programming

Using fread if the buffer size is not known

Hi... I am trying to read a binary data that have different types of messages of different lengths. I am using fread() but this functions needs the size and count to read the buffer from the file. I think this may cause that the buffer overlaps other messages. Is there an alternative to read...

2. AIX

Pipe Buffer Size

Hi:- One of our users is getting an error: "There is no process to read data written to a pipe.� I am trying to find out what the pipe buffer size is currently set to. How do I go about this? Thanks,

3. Red Hat

buffer cache size

hi everyone, can any one help change the buffer cache size in redhat and suse?? this error i got when i installed oracle 10g and it went well and when i try to mount the database using startup cmd it says too many buffer cache parameters (error code : ora-1034) thnq in advance

4. Programming

erase fread 's internal buffer ?

When fread is used twice, the second time it seems to overwrite the first time's output. Is there any way to clear fread's internal buffer after each use ? char *FILEREAD(const char *FILENAME) { static char READBUFFER = ""; READBUFFER = '\0'; // try to solve the problem but this will not...

5. UNIX for Dummies Questions & Answers

Determine switch buffer size

Hi everybody, I need to calculate the tcp buffer size of a network switch, since it's not specified in the manual; how do I do this? I have some machines connected to the switch and I can run some socket tests written in C between these machines (I can choose how many bytes to send and...

6. UNIX for Dummies Questions & Answers

Decrease buffer size

Hi, I am using the below command to get the output in a file called "Logs.txt" tail -f filename | egrep -i "cpu | hung " >> Logs.txt The problem is the Logs.txt file gets updated only after the buffer is 8Kb, but i want to update the file immediately and not wait for the buffer to get 8kb. Is...

7. Programming

[c] How to calculate size of the file from size of the buffer?

Hi, Can I find size of the file from size of the buffer written? nbECRITS = fwrite(strstr(data->buffer, ";") + 1, sizeof(char), (data->buffsize) - LEN_NOM_FIC, fic_sortie); Thank You :)

8. UNIX for Advanced & Expert Users

Physical disk IO size smaller than fragment block filesystem size ?

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 ...

9. Red Hat

Shrink ext4 filesystem and reduce the size of a Logical Volume in Linux

Hello guys, I would like to ask you kindly if you don't know some quick and safe method how to shrink ext4 filesystem and reduce the size of a Logical Volume in Linux, please? Thank you very much.

LEARN ABOUT V7

icheck

ICHECK(1M)																ICHECK(1M)

NAME

       icheck - file system storage consistency check

SYNOPSIS

       icheck [ -s ]  [ -b numbers ] [ filesystem ]

DESCRIPTION

       Icheck examines a file system, builds a bit map of used blocks, and compares this bit map against the free list maintained on the file sys-
       tem.  If the file system is not specified, a set of default file systems is checked.  The normal output of icheck includes a report of

	      The total number of files and the numbers of regular, directory, block special and character special files.

	      The total number of blocks in use and the numbers of single-, double-, and triple-indirect blocks and directory blocks.

	      The number of free blocks.

	      The number of blocks missing; i.e. not in any file nor in the free list.

       The -s option causes icheck to ignore the actual free list and reconstruct a new one by rewriting the super-block of the file system.   The
       file  system should be dismounted while this is done; if this is not possible (for example if the root file system has to be salvaged) care
       should be taken that the system is quiescent and that it is rebooted immediately afterwards so that the old, bad in-core copy of the super-
       block  will  not continue to be used.  Notice also that the words in the super-block which indicate the size of the free list and of the i-
       list are believed.  If the super-block has been curdled these words will have to be patched.   The  -s  option  causes  the  normal  output
       reports to be suppressed.

       Following the -b option is a list of block numbers; whenever any of the named blocks turns up in a file, a diagnostic is produced.

       Icheck is faster if the raw version of the special file is used, since it reads the i-list many blocks at a time.

FILES

       Default file systems vary with installation.

SEE ALSO

       dcheck(1), ncheck(1), filsys(5), clri(1)

DIAGNOSTICS

       For  duplicate  blocks  and  bad  blocks (which lie outside the file system) icheck announces the difficulty, the i-number, and the kind of
       block involved.	If a read error is encountered, the block number of the bad block is printed and icheck considers it to contain  0.   `Bad
       freeblock'  means  that	a block number outside the available space was encountered in the free list.  `n dups in free' means that n blocks
       were found in the free list which duplicate blocks either in some file or in the earlier part of the free list.

BUGS

       Since icheck is inherently two-pass in nature, extraneous diagnostics may be produced if applied to active file systems.
       It believes even preposterous super-blocks and consequently can get core images.

																	ICHECK(1M)