I created a swap file with root on a running server, using swapfile creation guides which I found on the net (http://blog.serverbuddies.com/adding-additional-swap-space-to-your-linux-server/m Create swap file on a running Linux machine, and http://www.cyberciti.biz/faq/linux-add-a-swap-file-howto/)
I made sure that I have plenty of disk space
[root@host /]# df -h Filesystem Size Used Avail Use% Mounted on /dev/md2 1016G 338G 628G 35% / /dev/md1 496M 116M 356M 25% /boot /dev/md3 1.7T 169G 1.5T 11% /home
, and after issuing the command
dd if=/dev/zero of=/swapfile bs=1024 count=8290304
The putty terminal became unresponsive, and the server became unresponsive as well (apache and other services crashed, network connections were closed). So, I executed a hardware reset, and everything is back and working fine. I can see the
/swapfile with a zero size, and
/var/log/messages has no info on this event. Is it safe to delete that file and reattempt creating it? Also why would a server crash at all with a
dd command? I had no swap file prior to this config attempt.
UPDATE: Based on symcbean's answer I run the command again with success! The load did go up to 20 while dd was running, so that may have caused issues the last time...
[root@host /]# dd if=/dev/zero of=/swapfile1 bs=1024 count=8290304 8290304+0 records in 8290304+0 records out 8489271296 bytes (8.5 GB) copied, 135.989 s, 62.4 MB/s