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Feb
20
comment Can enabling a RAID controller's writeback cache harm overall performance?
Would you mind putting together your data in some sort of structured table? This is some very interesting observations you're making, I'd like to see if there's a pattern.
Feb
14
comment Can't dd /dev/kmem in Ubuntu Jaunty
For completeness' sake, the same thing is done on RHEL 5.5
Feb
8
comment Why would I need a firewall if my server is well configured?
I first upvoted for PoLP, then downvoted for laziness. Firewalls are not tools to allow their owners to be sloppy. You should bother tightening your attack surface because if the attacker goes through the firewall (afterall you gotta have something open), they can just turn off iptables. Apply your laziness where it belongs: make the system as slop-free as possible, so you don't have to fix it for a long time.
Jan
22
comment What is “Cloud Computing”?
'The Cloud' is such a joke that I'm not sure it is possible to talk about it seriously.
Jan
18
comment How to find .conf files used by apache
The real problems are Includes as they can be nested, and thus requiring a (potentially infinite) recursive scan to detect the full set of configs that get read in. It's fairly easily scriptable as long as your Includes structure does not create loops: grep through the main httpd.conf, find paths to Includes, grep through that newfound include, keep until grep returns zero results or you're visiting a file that you've visited before.
Jan
7
comment FreeBSD: Samba performance over GBit-Ethernet
FreeNAS allows exporting the same files through different means. Try transferring the same files using a different protocol. If the speed changes, it's the protocol, if the speed doesn't change, then it's hardware or configuration.
Jan
7
comment I/O Performance Benchmarking Linux
Using SSH add's a CPU-bound component, so you can develop a bottleneck when testing on slow CPUs. Use netcat/socat instead and then you have next to no overhead.
Dec
29
comment optimal folder structure for storing 100k files on a USB drive
Wouldn't it be just easier to empirically test the different scenarios instead of guessing?
Dec
7
comment Windows 2008 Server on mixed ethernet speeds — download from share slow, but fast plain TCP
Did you try using a different NIC, switch, and cabling? It might be something as simple as hardware going bad.
Nov
29
comment Increasing Apache Server Availability
Are you invoking the Perl script through CGI or mod_perl?
Nov
29
comment Apache Default Permissions
Proper ownership might not be enough if the permissions are too lax. Add chmod -R 400 to everything that is read-only content.
Nov
28
comment How do I make tcpdump not print the tcp headers?
with tshark you can do it with: tshark -l -i eth0 -f 'port 6667 and greater 74' -T field -e data
Nov
23
comment Tools a Unix administrator cannot live without
I've recently started using socat as netcat's replacement and I've been amazed at the number of options it gives you. Definitely worth checking out, despite scary amount of switches and weird syntax.
Nov
18
comment Does enabling hardware x86 virtualization (AMD-V or Intel VT-x) slow down my computer if I'm not running virtual machines?
VT-x and VT-d are just extra instructions in your CPU. Not using them has the same exact impact as not using any other instructions--none ;)
Nov
10
comment bridge in linux
Out of the man page: "brctl setfd <bridge> <time> sets the bridge’s ’bridge forward delay’ to <time> seconds." by default it's 30 seconds, so I'm guessing that's what you're experiencing. Set it to 0 right after you bring up the bridge interface.
Nov
1
comment Disable HTTP Methods in Apache
Mod_rewrite also runs slow regex on every URL process, which slows the server down. Use with caution.
Oct
18
comment Linux tool for IPv6 unsolicited neighbor advertisements
Are you trying to force the new MAC<->IPv6 mappings on your local segment's neighbours?
Aug
28
comment Can I log ALL Apache traffic?
What are you trying to achieve?
Aug
16
comment Apache Virtual Host by name
The general answer is yes, but there are some sub-cases. Which type of vhosting are you trying to do? IP, port, name, or mass name-based vhosting?
Jul
27
comment simple statistical analysis from shell level
"overkill is underrated" (from the new A-Team movie)