What units are the output of mdadm -D below (specifically the Array Size and Used Dev Size values)? The answer is Kilobytes (1 byte = 1024 byte) for the number without units orRead More…

DF speed – Volume fill up speed – ddf & ddf-auto & ddf-auto-i script Need to know how fast in Kilobytes per second or Megabytes per second you mount point or volume isRead More…

SSH error “buffer_get_string_ret: bad string length 13105607” and “buffer_get_string: buffer error” I had no problem connecting via SSH from all my remote locations to my debian server for a long time, butRead More…

On the BTRFS mailing list one of the devs (or smart engineers) posted a different gddrescue script to clone brtfs drives, that should allow for better clones in times of troubles. ItRead More…

When you join one linux server to a domain it maps windows SIDs to linux UIDs (for users) and GIDs (for groups). When you join another server to the same domain itRead More…

RESETTING THE COUNTERS Lets say you want to reset all of the counters to 0. Given this, we need this: # ifconfig eth0 RC packets:12341234 errors: 0 dropped:0 overruns:0 frame:0 TX packets:61123Read More…

NOHUP REDIRECTION NOT WORKING WORKAROUND – BUG PERHAPS? If your running a script that redirects to files Then you have nohup wrapping that script Showing by Example: Here is the contents ofRead More…

SLABTOP BTRFS DURING MOUNTS ############################# Its intersting to watch the mounts with slabtop and top. Btrfs moutns can take a minute because of the metadata work they do during the mount. ThisRead More…

dd and fallocate and truncate to make big files quick ########################################## Every example below will be with creating a 10 gig file. dd will take time, where as fallocate and truncate willRead More…

THE SPEECH BEFORE THE SCRIPT tl;dr note you can just skip to the script below if you want This script uses ddrescue (the newer one between gddrescue and ddrescue, so it uses gddrescueRead More…