10 More Discussions You Might Find Interesting
1. BSD
hi
Has anyone already tried to migrate a hard disk with FreeBSD using recoverdisk? (1 Reply)
Discussion started by: ccc
1 Replies
2. Linux
Hi all,
I'm kind of new to programming in Linux & c/c++. I'm currently writing a FileManager using Ubuntu Linux(10.10) for Learning Purposes. I've got started on this project by creating a loopback device to be used as my virtual hard disk. After creating the loop back hard disk and mounting it... (23 Replies)
Discussion started by: shen747
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3. UNIX for Advanced & Expert Users
When we write a programme,we declare variables and compiler allocates memory to them.I want to get access to the physical block number of hard-disk where actually the data is stored by the programme "
Some one help me out... (3 Replies)
Discussion started by: nagraz007
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4. Red Hat
When we write a programme,we declare variables and compiler allocates memory to them.I want to get access to the physical block number of hard-disk where actually the data is stored by the programme "
Some one help me out... (1 Reply)
Discussion started by: nagraz007
1 Replies
5. Solaris
Hi freinds,
What is the command to find out the hard disk details (logical name, FS type etc,). Because i connected one ntfs partition and i don't know the hard disk logical and physical name to mount it.Kindly do the needful.
Thanks | P.Bharathiraja. :mad: (2 Replies)
Discussion started by: bharathiraja
2 Replies
6. SCO
hi
I've a fresh installation of SCO 5.0.7 on the IDE hard disk.
For SCSI hard disk I can declare, for example blc disk driver using:
# mkdev hd 0 SCSI-0 0 blc 0but it works for IDE hard disk? (3 Replies)
Discussion started by: ccc
3 Replies
7. UNIX for Dummies Questions & Answers
:eek: I use this Solaris to run CMS a call acounting software package for my job. No one could run reports today because it said the this when you logged on
"The following file systems are low, and could adversely affect server performance:
File system /: 99%full"
Can some one please explain... (9 Replies)
Discussion started by: mannyisme
9 Replies
8. UNIX Desktop Questions & Answers
I have a cuestion. How Can I to add other hard disk to my computer? I need to configurate anyone? (4 Replies)
Discussion started by: hmaraver
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9. UNIX for Dummies Questions & Answers
Hello all..
Iam New to Unix Environment. I need to copy .cpio file from CD to a Folder on Sun 5.8 Box.
Can anyone give me the commands to execute this ?..
Thanks in advance
Ron (4 Replies)
Discussion started by: vr76413
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10. Filesystems, Disks and Memory
I had an issue with a second hard disk in my machine. I have a sparc station running solaris 7. It was working fine but now it wont mount on boot up and when you try to mount it manually it gives an I/O error. I tried a different disk as a control which was fine. What I want to know is if my... (3 Replies)
Discussion started by: Henrik
3 Replies
SYNC(2) BSD System Calls Manual SYNC(2)
NAME
sync -- synchronize disk block in-core status with that on disk
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
void
sync(void);
DESCRIPTION
The sync() function forces a write of dirty (modified) buffers in the block buffer cache out to disk. The kernel keeps this information in
core to reduce the number of disk I/O transfers required by the system. As information in the cache is lost after a system crash, kernel
thread ioflush ensures that dirty buffers are synced to disk eventually. By default, a dirty buffer is synced after 30 seconds, but some
filesystems exploit ioflush features to sync directory data and metadata faster (after 15 and 10 seconds, respectively).
The function fsync(2) may be used to synchronize individual file descriptor attributes.
CAUTIONS
Many modern disks contain write-back caches. In theory sync() flushes these. In practice there are many possible ways for this mechanism to
go astray. It is prudent (where possible) to allow a few seconds after syncing for everything to settle before e.g. turning off the power.
It may also be desirable to use dkctl(8) or scsictl(8) to disable the write-back cache entirely.
SEE ALSO
fsync(2), dkctl(8), scsictl(8), sync(8)
HISTORY
A sync() function call appeared in Version 6 AT&T UNIX.
Historically, sync() would schedule buffers for writing but not actually wait for the writes to finish. It was necessary to issue a second
or sometimes a third call to ensure that all buffers had in fact been written out. In NetBSD, sync() does not return until all buffers have
been written.
BSD
March 25, 2009 BSD
06-05-2009
That helped. So I am guessing writing to the device file for the HDD, opened with (O_SYNC) coupled with an extra sync command and a sleep, between the 2 swipes should be enough to ensure what I am asking to be written to disk actually does get there.