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location Boston, MA
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visits member for 5 years, 2 months
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Apr
30
accepted Any options out there for kerberized ssh client on windows?
Apr
30
comment Any options out there for kerberized ssh client on windows?
It looks like gssapi has been added to putty. I had used a clunky hacked version that would hang for 30 seconds or more if you had gssapi turned on on the client but not the remote system. I don't currently work in an environment that uses kerberos so I can't tell if that issue is the case with the stock putty version. Nevertheless, I think mainline is probably the place to start here. Thx!
Apr
29
asked Can you set inode quotas in ZFS?
Apr
24
comment New office cabling: should we use CAT7 or CAT6a?
The install isn't only the components -- it is trivial to have a cat5e install made up of entirely components rated as cat6a. The only way to tell the difference is with one of these: datacomtools.com/catalog/cat-6-tester.htm -- and not the $1300 one, you have to use the $10,000 one. And when there's fishy behavior on your "cat6a" network 3 years after it is installed, you think any typical shop will have one of these in their cable test kit?
Apr
24
comment New office cabling: should we use CAT7 or CAT6a?
I think you misunderstand -- the "Standard" only works if you've tested the whole cable install. Port to port. If your vendor doesn't do a full test, or if you substitute a non-cat6a cable as a patch cable, or if the structured cabling gets roughhoused because someone has to replace a switch -- you'll easily wind up with a non-cat6a install that still works at 10gb, but not always, such as maybe when you've plugged your 30th 10gb node in, long after the incident that actually degraded the cable.
Apr
22
comment Multiple DNS, priority of Servers
You really should specify which client you're talking about. They all behave differently, and often the behavior is documented.
Apr
19
comment New office cabling: should we use CAT7 or CAT6a?
FWIW -- I've run 1gb on cat5 and I've run 10gb on cat5e that I made myself. That is actually one of the things that makes me really wary of these standards and the actual installs. The standards make it so a catX install will work in all situations -- reality is worse -- it will work when you "test" it with a couple nodes then act weird when you add the 80th node to the network.
Apr
19
revised New office cabling: should we use CAT7 or CAT6a?
added 156 characters in body
Apr
19
answered New office cabling: should we use CAT7 or CAT6a?
Apr
14
comment Recursively delete empty folders with verbose output
I worry about the logic of this -- is a directory empty if it only contains directories that are empty? Also -- as far as logging the output -- whenever I do something like this that has the potential to wreck a whole bunch of stuff, I have it output the command it would run but not actually run the command itself. Then, if I actually want to run those commands I can just run the output like a shell script.
Apr
7
comment Anycast DNS — how do you deal with TCP DNS requests?
Which OSPF implementations offer per-flow ECMP instead of a per-packet ECMP? In a perfect world I'd just get the ECMP to chose a path based on a hash of (source IP / source port).
Apr
5
comment Something is burning in the server room; how can I quickly identify what it is?
+1 for the buddy system. I think it's a little nuts that there are DCs out there that use the EPO to also dump fire suppression as well. There are plenty of situations where you'd want to EPO without wanting to dump halotron all over the guy getting electrocuted. An EPO is a serious deal but isn't a "destroy everything in the DC kinda deal" or at least shouldn't be. The guys in the DC should hopefully understand the big red button and the fire suppression system well enough to weigh the effect of hitting the button. An EPO may actually stop a fire and save the DC, for instance.
Apr
4
awarded  Enlightened
Apr
3
awarded  Nice Answer
Apr
3
revised Why is Clonezilla faster than dd?
cleaned up formating / punctuation / clarified "empty space on source drive"
Apr
3
answered Why is Clonezilla faster than dd?
Apr
3
accepted Anycast DNS — how do you deal with TCP DNS requests?
Apr
3
comment Anycast DNS — how do you deal with TCP DNS requests?
Ah, so the connection tracking is the key -- people.netfilter.org/pablo/docs/login.pdf -- each node runs a firewall that knows the state of each other firewall and forwards traffic to the proper firewall if it happens to receive traffic "for my ip but not for me".
Apr
3
comment ZFS / ZFS send for database replication
Let's assume linux and/or freebsd.
Apr
3
asked ZFS / ZFS send for database replication