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Jul
31
comment Too many TCP connections causes disconnections
How many network cards does this server have and what are the settings for each (i.e. ethtool ethX)
Jul
30
comment sudden high CPU, causing server to be unresponsive
Do you have any cron jobs running at that time?
Jul
29
comment File I/O Throughput
I suspect that write barriers are being sent where the performance is poor.
Jul
29
comment File I/O Throughput
Please list the filesystem (e.g. ext3 or ext4) for each along with the options (e.g. noatime) to make sure you are comparing apples to apples.
Jul
23
comment What's the optimal server configuration for fastest inserting in a MySql database in this scenario?
Is this a data warehousing use case?
Jul
22
comment Server Hardware/Settings for high traffic
Load test your app in a test environment. No one is going to be able to answer you. Please see: serverfault.com/questions/350454/…
Jul
17
comment NFS directory not working
Does mounting as (vfstype) nfs4 make a difference?
Jul
1
comment MySQL is running VERY slow on CentOS 6x (not 5x)
barrier=0 instead of defaults
Jul
1
comment connections on port 80 suddenly refused / server not responding
Firewall/IPtables?
Jul
1
comment MySQL is running VERY slow on CentOS 6x (not 5x)
The default datadir is /var/lib/mysql and given your laptop file info the datadir is on ext4. Edit /etc/fstab to include barrier=0 as a mount option and reboot.
Jun
26
comment How important is patch management?
Not to be pedantic, but I think you mean "prying eyes".
Jun
22
comment Webserver load test
Canonical question: serverfault.com/questions/350454/…
Jun
20
comment Unable to setup HTTP Server so that external clients can access
What are the firewall rules?
Jun
20
comment LAMP -> CPU usage of Apache processes too high
Are you using mod_security?
Jun
12
comment Performance drop after hours of runtime - how to detecting bottleneck
Collect metrics with Cacti or Munin for a start.
Apr
8
comment mysql client slow login strace
If you do a SHOW PROCESSLIST while the client is connecting do you have some relatively long running thread in "checking permissions" state? How many users are in the mysql.user table?
Feb
27
comment Does the OS (Ubuntu LTS vs CentOS) has a significant impact on the performance of a MySQL Server
I think it will be difficult for anyone to answer this without doing an apples-to-apples test. You should do your own testing where you use the same version of MySQL with identical configuration settings not only of MySQL (my.cnf) but of the filesystem, etc. I would be very surprised if after all that effort to standardize if there was a significant performance difference.
Feb
18
comment Mysql using the whole CPU, can't explain why
Also see if you have some long running queries. e.g. mysqladmin processlist
Feb
18
comment Mysql using the whole CPU, can't explain why
What OS / version? I suspect those are threads of a single MYSQL process.
Feb
18
comment CentOS system emails fail
Dovecot is not a SMTP server. If you don't have experience setting up Sendmail or Postfix and email origin authentication measures (e.g. DKIM signing your email) I'd recommend that you checkout PostMarkapp.com