Recent content by ericl

Glad i read this post. i just downloaded the iDefrag Demo. I am a Storage Engineer who mainly does large Unix systems - wish I had a tool like iDefrag. So, quick answer; all disks (filesystems actually) get fragmented. If you logically model your disk as a 2-D circle viewed from the top...

theed, you rock dude!! If you are writing to something with cache, yup it doesn't matter til the cache fills-up & starts madly writing files (usually the oldest) to disk. Last time I used EMC, default was to set the high water mark at 85%. Two problems, (1) management likes to save money...

***********WARNING********************* RAID1 mirrors disk blocks - it's goal in life is to make sure each disk involved in a single write operation contains the same data. The redundant levels of RAID are not a substitute for backups. Corrupt your data and/or filesystem & RAID1 will...

David, there are many thick books on this subject - the man pages on your Mac do a pretty good job. If you were to open a terminal window, & were using the default tcsh, you couls enter: #bash<CR> and be in the bash shell. To the best of my knowledge, none of the environment stuff set...

setenv PATH "/bin:/sbin:/usr/bin:/usr/sbin:/usr/x11R6/bin"

I just meant to help, stimulate thought. I'm an unemployed UNIX person trying to see if I still like computers. I'm trying to learn more about this UNIX especially the filesystems it uses. Your observations are correct; lot's of UNIX experience, zero experience at posting, etc. I type like...

I looked at the info on Apple's support page searching on "journal log". It tells how to enable/disable, plus some useful stuff. Also, although the info alludes to jounaling a disk, thinking of it as journaling all the filesystems on a certain disk. Filesystems have 2 tipes of information...

Well, you are comparing Apples 7 Oranges!! Just kidding. You didn't say how much memory each host had (installed ohysical memory) You didn't say how much free memory each host had before you hit the <return> key. On a unix host that has been running for a few hours (#uptime command)...

#ps -ef is AT&T unix syntax For MACOS, which is bsd, #ps -aux will give similar results. #top is just a filter for #ps, with #top showing the processes consuming the most CPU resources. Most of the info reported by any version of #ps is very transient in nature. As an example, #ps may...