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Jul
28
awarded  Revival
Jul
3
awarded  Civic Duty
Jun
24
awarded  Popular Question
Jun
21
awarded  Popular Question
Jun
19
awarded  Yearling
Jun
13
comment Dual Controller SAN 8x1GBE or 4x10GBE Performance
It looks like the 6224 is a line-rate switch, so that's good. I've used Nortel, Extreme, and Enterays switches -- they often use exactly the same chipset but use their own software on the switch and there are huge differences in the quality of the software. Fortunately, if you're doing pure L2 you won't need to worry about that too much. If possible, get your vendors to each loan you the equipment they want to sell you and implement it with both and load-test both. Regardless, you want 10gig if you can get it.
Jun
13
comment Dual Controller SAN 8x1GBE or 4x10GBE Performance
I think the cisco 2960 is an oversubscribed switch with a total backplane speed of 32gb/sec. You really don't want to oversubscribe your storage network. There are plenty of switch vendors out there who will sell you something that is line-rate for all ports...
Jun
11
answered Collectd retrieving only NaN on Xen dom0
Jun
11
comment Any options out there for kerberized ssh client on windows?
@alex thanks I'll take a look at it. Hopefully it has fixed the weird problem with forks of putty where accessing a non-kerberized host with GSSAPI turned on would cause a 45+ second pause before attempting any other authentication.
Jun
10
comment Collectd retrieving only NaN on Xen dom0
Do you have the same version of collectd running on the dom0 host, and probably more importantly, do you have the same "types" files on the domU and dom0 hosts? Briefly try turning on a "CSV" logger as well as the RRD logger and look at the output of the dom0's csv files. Are you just using the collection.cgi thing for looking at the RRDs?
May
11
asked Acceptable number of ethernet errors in a medium sized environment?
May
10
comment Better/alternate front-end/graphs for munin?
@sciurus: First let me say that as of right now, I haven't actually finished this so I may change it around completely... But my feeling is that if I've got both the RRD and a raw CSV available, I'll have more options for a graphing back-end than if I only had one. And I suspect I'd have an easier importing / feeding a CSV into whisper than an RRD, or at worst, they'd be equally hard / easy.
May
10
answered Better/alternate front-end/graphs for munin?
May
10
comment Better/alternate front-end/graphs for munin?
I recently did "read up on status / monitoring / trending" compare and contrast and decided to use collectd for the majority of our systems monitoring. You can output CSV files and rrd at the same time; my plan is to export the CSV into something like graphite after I've got all the rest of everything worked out.
May
9
comment mirrored filesystem across a few servers
The key to understanding OpenAFS is that it is a cache management system -- there is one namespace (IE only one "file" exists) but there are cached copies of the file everywhere and a protocol to make sure that all the cached copies are consistent. If you lose the master you can turn one of the cached copies into the master, but it isn't ideal to be in that situation.
May
9
comment mirrored filesystem across a few servers
Yep. And it is possible, though annoying, to recover from losing the primary master. But it is trivial to have multiple writers and the resulting blocks stored on multiple hosts.
May
8
revised Domain reg - own server - need nameserver
added 1 characters in body
May
8
comment Domain reg - own server - need nameserver
I'm a control freak. I don't do anything important on that box. I did/do it to learn exactly how things work. I would never suggest you do this for anything even slightly important, but it is valuable / useful to know how the whole stack works. Oh -- and the VPS service I have is extremely inexpensive.
May
8
answered Domain reg - own server - need nameserver
May
7
answered SFP+ twinax cable compatibility