565 reputation
29
bio website zlynx.org
location Greenwood Village, CO
age 39
visits member for 5 years
seen 2 days ago

Nothing interesting about me. This is not the user you are looking for. Move along. Move along.


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
24
comment How do I protect my company from my IT guy?
Definitely. Also, someone needs to verify/audit the documentation to know it is currently accurate and works.
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...
Mar
9
comment Is it normal to get hundreds of break-in attempts per day?
Instead of iptables rules or hosts.deny try using ipsets. You make a iptables rule to block every IP/network in the set, then add IPs to the set. The ipset implementation is very fast: much faster than the iptables rule chains.
Feb
2
comment Is it safe to use consumer MLC SSDs in a server?
One trick to get more reserve space out of a drive is to do the secure erase, then partition it with a large fraction unused. This free space will add to the SSD's performance and lifetime.
Oct
20
comment RAID 5 with big SATA disks. Do or don't?
Seeks are often slower on the big commercial drives because it takes longer to find the right data track.
Sep
16
comment Linux box time dilation, part 2
Good idea. It does sound like Linux is using TSC on a CPU with variable TSC and power saving modes.
Jul
24
comment Advantages and disadvantages of ARM vs x-86 processors in future laptops
Most of GCC's optimizations happen regardless of the instruction set being compiled for. In fact, GCC is one of the more used ARM compilers already.
Jul
18
comment What is ECC ram and why is it better?
I disagree with the article. I think everyone should be using ECC. I wasn't going to give in but I wanted a new Core I7 enough that I finally did. However, I am sure my 6GB of RAM are picking up errors all over the place.
Jul
18
comment What is ECC ram and why is it better?
A bit error in a number anywhere, including someone's small business finance package can be very small or very large. It all depends on what bit.