[CentOS] Copy on write loop block driver
Jason Pyeron
jpyeron at pdinc.usWed Aug 27 00:03:22 UTC 2014
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I am running on the Centos 6.5 x86_64 boot disk. # uname -a Linux localhost.localdomain 2.6.32-431.el6.x86_64 #1 SMP Fri Nov 22 03:15:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux I have been running ddrescue for a while and now it is time to check the progress. I want to take the oldhd.img output from ddrescue and load it to satrt performing recovery (LVM, then filesystem) but I want to do a copy on write with that. I fetched http://www.atcomputing.nl/Tools/cowloop/packages/cowloop-3.2.0.1.tar.gz, built it root at localhost ~/cowloop-3.2.0.1 # cowdev -a /root/oldhd.img /root/oldhd.cow Cannot open /dev/cow/ctl: No such device or address So I: root at localhost /dev # mkdir cow root at localhost /dev # cd cow/ root at localhost /dev/cow # mknod /dev/cow/ctl b 241 255 But I still get a root at localhost ~ # cowdev -a /root/oldhd.img /root/oldhd.cow Cannot open /dev/cow/ctl: No such device or address Listing /proc/devices I do not see 241. What am I doing wrong here? -Jason -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - Jason Pyeron PD Inc. http://www.pdinc.us - - Principal Consultant 10 West 24th Street #100 - - +1 (443) 269-1555 x333 Baltimore, Maryland 21218 - - - -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This message is copyright PD Inc, subject to license 20080407P00.
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