Hi ,
I have a question about performance of writing into a file.
Will it take more time to open a file, write a line into the file and close the file
if the file size grows bigger and bigger??
Say, I have two files of sizes 100KB and 20MB.
Will it take more time to open/write a... (1 Reply)
About 4 years ago I wrote this tool inspired by Rob Urban's collect tool for DEC's Tru64 Unix. What makes this tool as different as collect was in its day is its ability to run at a low overhead and collect tons of stuff. I've expanded the general concept and even include data not available in... (0 Replies)
Hi All
I am reading a huge file of size 2GB atleast. I am reading each line and cutting certain columns and writing it to another file.
Here is the logic.
int main()
{
string u_line;
string Char_List;
string u_file;
int line_pos;
string temp_form_u_file;
... (10 Replies)
hi all,
I was able to do a script to gather a few files and sort them.
here it is:
#!/usr/bin/ksh
ls *mainFile* |cut -c20-21 | sort > temp
set -A line_array
i=0
file_name='temp'
while read file_line
do
line_array=${file_line}
let i=${i}+1 (5 Replies)
Hello,
I'm running a script on AIX to process lines in a file. I need to enclose the second column in quotation marks and write each line to a new file. I've come up with the following:
#!/bin/ksh
filename=$1
exec >> $filename.new
cat $filename | while read LINE
do
echo $LINE | awk... (2 Replies)
Hello Gurus,
We are facing some performance issue in UNIX. If someone had faced such kind of issue in past please provide your suggestions on this .
Problem Definition:
/Few of load processes of our Finance Application are facing issue in UNIX when they uses a shell script having below... (19 Replies)
Hi guys,
what is the relation between I/O performance and file systems.
I have a file systems called /dcs/data01 which is having 4Tb size.
According our application we can split the file system like
dcs/data01 -> 1Tb
dcs/data02 -> 1Tb
dcs/data03 -> 1Tb
dcs/data04 -> 1Tb
do you... (4 Replies)
Please, I need help tuning my script. It works but it's too slow.
The code reads an acivity log file with 50.000 - 100.000 lines and filters error messages from it. The data in the actlog file look similar to this:
02/08/2011 00:25:01,ANR2034E QUERY MOUNT: No match found using this criteria.... (5 Replies)
Hello all -
I am to this forum and fairly new in learning unix and finding some difficulty in preparing a small shell script. I am trying to make script to sort all the files given by user as input (either the exact full name of the file or say the files matching the criteria like all files... (3 Replies)
Hi Experts,
I have a filelist collected from another server , now want to sort the output using date/time stamp filed.
- Filed 6, 7,8 are showing the date/time/stamp.
Here is the input:
#----------------------------------------------------------------------
-rw------- 1 root ... (3 Replies)
Discussion started by: rveri
3 Replies
LEARN ABOUT V7
xfs_freeze
xfs_freeze(8) System Manager's Manual xfs_freeze(8)NAME
xfs_freeze - suspend access to an XFS filesystem
SYNOPSIS
xfs_freeze -f | -u mount-point
DESCRIPTION
xfs_freeze suspends and resumes access to an XFS filesystem (see xfs(5)).
xfs_freeze halts new access to the filesystem and creates a stable image on disk. xfs_freeze is intended to be used with volume managers
and hardware RAID devices that support the creation of snapshots.
The mount-point argument is the pathname of the directory where the filesystem is mounted. The filesystem must be mounted to be frozen
(see mount(8)).
The -f flag requests the specified XFS filesystem to be frozen from new modifications. When this is selected, all ongoing transactions in
the filesystem are allowed to complete, new write system calls are halted, other calls which modify the filesystem are halted, and all
dirty data, metadata, and log information are written to disk. Any process attempting to write to the frozen filesystem will block waiting
for the filesystem to be unfrozen.
Note that even after freezing, the on-disk filesystem can contain information on files that are still in the process of unlinking. These
files will not be unlinked until the filesystem is unfrozen or a clean mount of the snapshot is complete.
The -u flag is used to un-freeze the filesystem and allow operations to continue. Any filesystem modifications that were blocked by the
freeze are unblocked and allowed to complete.
One of -f or -u must be supplied to xfs_freeze.
NOTES
A copy of a frozen XFS filesystem will usually have the same universally unique identifier (UUID) as the original, and thus may be pre-
vented from being mounted. The XFS nouuid mount option can be used to circumvent this issue.
In Linux kernel version 2.6.29, the interface which XFS uses to freeze and unfreeze was elevated to the VFS, so that this tool can now be
used on many other Linux filesystems.
SEE ALSO xfs(5), lvm(8), mount(8).
xfs_freeze(8)