Solved

cpio restore can we make it faster?

Posted on 1999-01-12
3
236 Views
Last Modified: 2013-12-26
Currently, we use the following command to backup our data:
find. -depth -print | cpio -ocBL -O /dev/rct0
but the problem is when we want to restore a single file we use
cpio -vicdumBA -l/dev/rct0 filexx   this take forever to restore, how can we make it faster. I am dying here please help. thanks
0
Comment
Question by:petro2
3 Comments
 
LVL 51

Expert Comment

by:ahoffmann
ID: 1295385
remove A option from cpio
0
 
LVL 3

Accepted Solution

by:
mliberi earned 100 total points
ID: 1295386
At restore time the cpio command must read the whole block, even if you must restore a single file.

You could split the huge block to many little blocks. The restore operation could be done in two steps:
1) seek the block containing the file
2) read the block for file extraction

The first operation is very fast compared to the second.

Example: (I'm supposing that /dev/rct0.1 is the NO REWIND version of /dev/rct device, please check your os man pages)
               *** BACKUP ***
$ find A | cpio -ocBL -O/dev/rct0.1 # create first block on tape
$ find B | cpio -ocBL -O/dev/rct0.1 # create second block
.
$ find Z | cpio -ocBL -O/dev/rct0.1 # creat n-th block

let's suppose we want to extract a file within directory Z (n-th block)
$ tctl -f /dev/rct0 fsf <n-1>   # seek n-th block, FF very quick
$ cpio -vicdumBA -l/dev/rct0 filexx # extract filexx
0
 

Author Comment

by:petro2
ID: 1295387
It from this point forward, I was hoping for a miracle, an answer that would work on some of the old backups thanks
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
isEverywhere  challenge 19 77
matchUp  challenge 6 64
abstract class with all non abstract mentods 6 76
Problem to open Excel file 15 134
This is to be the first in a series of articles demonstrating the development of a complete windows based application using the MFC classes.  I’ll try to keep each article focused on one (or a couple) of the tasks that one may meet.   Introductio…
Introduction: Ownerdraw of the grid button.  A singleton class implentation and usage. Continuing from the fifth article about sudoku.   Open the project in visual studio. Go to the class view – CGridButton should be visible as a class.  R…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
Two types of users will appreciate AOMEI Backupper Pro: 1 - Those with PCIe drives (and haven't found cloning software that works on them). 2 - Those who want a fast clone of their boot drive (no re-boots needed) and it can clone your drive wh…

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question