If you use the svn subversion tool to update source tree or ports tree, you want to have a possibility to look back what was pulled, pushed and droped you can use a Log File to monitor the update scripts. This helps if you temporarily log out the Terminal Sessions for a Coffee break.
If you use the current „head“ Version (Release 12) of FreeBSD with a svn updated /usr/src path you could run into errors after updating the OS via buildworld from sources.
There’s a bug ahead Revision „r314099“ at the „portsnap“ lib that will stop on extracting the ports.tgz to /usr/ports!
Solution: Pull again sources to /usr/src with
$svn update /usr/src
$portsnap fetch update #again.. to update ports tree
This should work now, the failed portsnap extract function was a known bug. If you dont want to rebuild the system, you can use svn to update /usr/ports via svn repository. You can later rebuild the source OS again.
FreeBSD: Clicking noise WDC WD5000LPVX SATA 3 Drive on FreeBSD 9.1
same like in Linux:
APM Funktion starts/stops the heads and make click sounds, not needed on a Server. To disable like in Linux with hdparm on FreeBSD do:
If you want to disable APM (Advanced Power Management) on your hard drive to reduce heads movements and increase your hard drive life you can do that very easy by using ataidle app from FreeBSD’s Ports:
make install clean; rehash
Then to disable APM on your hard drive run:
ataidle -P 0 /dev/ad0
We can start ataidle app at FreeBSD boot time by adding the following lines in /etc/rc.conf (the second line correspond to our previous command that we want to run at boot time):
Remark: most Server SATA Controllers change HDD Names like from ad6 to ada0, read last lines of „dmesg“ and see, „Drive ada0: Previously was known as ad6“ Message!!!
Current Laptops / PCs uses 16:9 Widescreen Displays and if you dont want to use Xorg (Gnome,unity,Openbox Desktops)
you can use on Linux Console the program called „screen“ it offers:
– Split Consoles horizontally and vertically
– disconnect the screen and let the scripts/commands active on remote Systems
– reconnect if the remote Session was broken cause network problems
On Gnome or unity you can use „terminator“
– manpage of screen
Problem: If you use IDE or SATA Disc Drives inside your Workstation or Server without a additional uninterruppted power supply after a power loss your Disc Drives can lose data, do not boot clean up agian or damage the drive headers and sectors.
Background: SATA or IDE Drives uses „Disc Cached Controllers“, the count of this disc cache reach from 8 to 64 megabytes. In case of data write to disc, the disc controllers do cache some data who are often used. A Raid 1 Disc Mirror is affected too by this problem. SCSI od SAS are not using Cache by default.
Install the software tool called hdparm to set the cache parameters to disabled, cause most of operating systems have enabled by default.
- at Debian/ubuntu do : # sudo aptitude install hdparm
- at Centos/Redhat do: #sudo yum install hdparm
now lets show discs which are installed:
- at Debian/ubuntu do: # sudo fdisk -l
- at Centos/Redhat do: #sudo /sbin/sfdisk -l
- at FreeBSD do: # fdisk -l
yet lets take settings to disable the cache on every boot:
- at all linux do: sudo nano /etc/rc.local
- insert for every drive
hdarm -W 0 /dev/sdX (X is for a to …)
- at FreeBSD do : #vi /etc/loader.conf
- insert once for all drives
- If you have two drives with same physical size inside your PC config a mdadm Software Raid 1 additional on your System.
- Set the PC Bios Settings to auto boot ofter power failure and plug off the power on you testing System, check the results. There should not be needed a check disk called fsck after the Test, but its better to do it.
- Hardware Raid Controllers do often have RAM Cache too, size 128MB up to 2GB, at power loss these Data lost, this can only be surpressed by a addtition RAM Cache Backup Battery connected to the Hardware Raid Controller
Problem: FreeBSD 9 use GPT Partitionlabel by default to remove with Linux do:
fdisk message: WARNING: GTP (GUID Partition Table) detected on '/dev/sdX'
The util fdisk isn't support GPT.
do on console:
sudo parted /dev/sdX
mklabel msdos (Enter Yes!)
now use Linux fdisk to recreate a new partion Table
System FreeBSD 8.0 R3 AMD64
– do portupgrade -f webmin
– do portupgrade -f perl
– do perl-after-upgrade -f
(to update all deps of Perl)
Problem: If you setup a free freebsd webserver with two disks on same size the ufs2 filesystem fails the gmirror raid1 if the server lost power. The problem is that open files are destroyed.
Solution: If you setup a new freebsd system create for every partition a extra partition (for journal) install the gjournal AFTER GMIRROR!! and make some power failure tests. After powerfailure the system must reboot and rebuild its mirror and should run online after rebuild without any problem.