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  • 0 posts edited
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  • 237 votes cast
Nov
23
comment Networking Units: Not getting expected performance from 100Mb Ethernet
@Sirex: Oh well, yes that is true. But the network will be 10x faster.
Nov
23
comment What happens when a consumer switch receives a VLAN-tagged Ethernet frame?
Eh. Linux end-point devices handle tagged frames just fine. I have seen them do it.
Nov
18
comment Copy large files to multiple machines on a LAN
@user606723: Doesn't everything modern? Maybe some consumer junk does not, but I haven't run into anything with broken multicast in a while. Too much uses it these days. I think Windows Active Directory even uses multicast.
Nov
7
comment What is ECC ram and why is it better?
@JeffAtwood: And, like everyone I am sure, I've occasionally had to reinstall an application (Office. Visual Studio.) because it has apparently gone insane. App bug or ECC error causing a corrupt disk file? Who knows if you don't have ECC?
Nov
7
comment What is ECC ram and why is it better?
@JeffAtwood: Nothing usually, but I have had the occasional blue-screen for no apparent reason. On systems I have which do have ECC I will see a couple of single bit errors each month.
Oct
28
comment Is there a good way to keep IPv6 multicast packets off WiFi?
If it is multicast packets then why is the wifi sending them? It should only be sending a multicast packet to a network if there is someone listening for it on that network.
Oct
28
comment Linux IPv6 Transparent Proxy (but Linux doesn't support NAT on IPv6!?)
@coredump: Because transparent "Just Works" while automatic proxy only sometimes works and the users think the internet is broken.
Oct
28
comment Will everyone having Globally Accessible IP's in IPv6 be kind of a security nightmare?
@JohnGardeniers: Your concern is why IPv6 added temporary private addresses. Windows uses them by default. What it does is outgoing connections use a randomized temporary address. Incoming connections can connect to the permanent system address if you have publicized it.
Oct
19
comment How do you make it obvious you are on a production system?
#1 is an interesting idea but impractical because scripts running as daemon users might need to use rm, chmod, etc.
Oct
19
comment How do you make it obvious you are on a production system?
@symcbean: that is not what Sionide said. He could have meant after you SSH into your user account.
Oct
10
comment Make a program un-uninstallable by Local Admin
Agreed that the problem is users having admin. On the other hand, I would not want to work anywhere that won't let me have admin on my workstation.
Sep
16
comment Should I use the Linux 2.6.x or 3.x kernel on a production server?
-1 because your answer isn't very useful. 3.0 may be too new this month. But when people read this three months from now that will no longer be true.
Jul
17
comment Is it valid to have part of an IPv4 address set to zero?
@Ritesh: If the interface rejects an entry with a 0 then you cannot use some of the IPs on the network.
Jul
4
comment Ordinary users are able to read /etc/passwd, is this a security hole?
@joechip: If you had to use a service for ID to user-name translation...well, it would be trivial to just ask it to translate all UIDs from 0 to INTMAX.
Jun
21
comment Zeroing SSD drives
@Chopper3: You cannot see that ATA TRIM and SCSI UNMAP are the same command? UNMAP is definitely used in thin provisioning. TRIM does zero out blocks on at least some SSD drives. After TRIM the data is gone: there is no supported method to retrieve it, the drive might as well return zeros and some do.
Jun
21
comment What is faster? A local mechical hard drive or a solid state drive over gigabit ethernet?
This depends greatly on your server. A system optimized for network file service (ie, a SAN) can out-perform 20 local 15K SAS drives on a database workload. It just all depends.
Jun
14
comment Employee no longer with the company
Also, its been my experience that sysadmins miss a lot of stuff. One guy still had an open SSH session on a server after his account had been closed. He used Unix talk to tease us before he closed it down. The point: You pretty much have to have some trust, so you may as well treat them well.
Jun
14
comment Employee no longer with the company
Such a good point!
May
25
comment Does it make sense to install SSDs on server?
@alex: There are plenty of companies who will sell very expensive SSD solutions designed for databases and they guarantee the results. Some people have been able to replace 30 servers with one. It's like going from disks to memcached.
Mar
21
comment Server RAM vs PC RAM
Why would you buy one piece of 8 GB RAM? Most any server has at least 4 RAM slots. If you needed maximum RAM you would buy 4 8GB pieces. If you needed 8GB you would buy 4 2GB pieces. But never 1 8GB piece...