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• Free or very Cheap VPN server software with high concurrent users count

  - by Martin KS

  I'm hoping to implement a VPN whereby about 200 concurrent users can log in to briefly access my network. I had a look at OpenVPN and this seemed excellent, but was hoping that there would be a less costly option on a per-concurrent-user basis. I've no need for particularly strong security, and my only other requirement is that I would need to be able to add users in bulk via csv or similar. Does anyone have any suggestions?

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• How to debug high memory usage by registry?

  - by bkr

  I have a windows 2008 r2 server running ADFS2 and some web apps that is having issues with low memory. Digging around I found that the 5.5 GB were being used under Kernel Memory (paged). Further digging with Poolmon, I discovered that the majority of that (5GB+) was being used by CM - configuration manager. Also known as the registry. I'm really now sure how to tell why the registry is using so much memory however, or how to release it? Looking at the physical registry files they don't appear that large. EDIT #1 Using the powershell script @ http://jdhitsolutions.com/blog/2011/05/get-registry-size-and-age/ confirms what I saw looking at the physical registry files, that they're relatively small Computername : (removed) Status : OK CurrentSize : 67 MaximumSize : 2048 FreeSize : 1981 PercentFree : 96.728515625 Created : 4/1/2011 11:38:02 AM Age : 454.23:41:28.2540682

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• linux migration/N high cpu consumption

  - by Alexander

  on my linux appliance based on 3.0.0-14 kernel I got: RPN:/tmp# ps axuf | grep migration root 6 92.9 0.0 0 0 ? S Apr23 2788:33 \_ [migration/0] root 7 99.7 0.0 0 0 ? S Apr23 2993:20 \_ [migration/1] my top is RPN:/tmp# top -b -n1 top - 12:03:41 up 2 days, 2:18, 5 users, load average: 25.76, 25.26, 24.73 Tasks: 171 total, 1 running, 168 sleeping, 0 stopped, 2 zombie Cpu(s): 14.0%us, 12.6%sy, 0.8%ni, 72.0%id, 0.3%wa, 0.0%hi, 0.3%si, 0.0%st Mem: 1543032k total, 1264728k used, 278304k free, 25308k buffers Swap: 0k total, 0k used, 0k free, 183168k cached My question: why processes "migration/N" take so much CPU?

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• What happens if an OpenStack cloud controller dies?

  - by magu

  I've been reading up on OpenStack and how we can re-create an EC2/S3-style cloud for our internal development and I'm having a hard time finding information on how the OpenStack cloud controller provides redundancy of the cloud management services. I know I can setup multiple Swift and Nova nodes, but not a single document/article/howto/wiki contains information on: a) what happens if the cloud controller node dies; and b) how to setup redundant cloud controllers. It seems to me that, although it is massively scalable, there is a big single-point-of-failure built into OpenStack. Can anyone with more experience on OpenStack please shed some light as to how it all works in regards to high-availability?

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• UW-IMAP server, high load for one user

  - by Bruce Garlock

  We have been experiencing a very strange anomaly, with one specific user with our UW-IMAP server. We have about 75 users using the server, and one particular user, who is in about the middle as far as used storage keeps having issues with slow speed. Most of our users all use Thunderbird 2, or Thunderbird 3. Mostly 2, because of the performance issues we have had with 3. This user was on 3, and I downgraded him to 2. The performance has gotten better, but according to the imapd processes on the server, his username is using the most CPU % and CPU time. I've already done all the usual T/S'ing: Started profile from scratch, compacted folders, re-indexed, newer faster computer, etc.. Still, this users' imapd process is always using the most CPU on the server. For troubleshooting, we setup another user which has more usage, folders, etc.. than he does, but we don't see the users process taking up most of the CPU with the imapd process. So, it almost sounds like a particular email may be the culprit, but how can we find it, if thats the problem? This has been going on for a while, and he is a management person, so his patience is about to end. Does anyone have any ideas?

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• New CentOS/cPanel servers showing high load averages at idle

  - by Jax

  I have taken delivery of two identically specced CentOS/cPanel servers, showing the same behaviour of a resting load average of 1.30, 1.21, 1.16 and yet the CPU is sitting 100% idle. Hardware: Xeon(R) CPU E3-1270 4GB RAM Behavior:- top shows CPU 99.9% idle virtually no disk IO Some command output :- uname -a Linux server.myserver.com 2.6.18-308.4.1.el5PAE #1 SMP Tue Apr 17 17:47:38 EDT 2012 i686 i686 i386 GNU/Linux top top - 10:37:50 up 1:47, 1 user, load average: 1.28, 1.20, 1.17 Tasks: 199 total, 1 running, 198 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni, 99.9%id, 0.1%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 4125104k total, 438764k used, 3686340k free, 25788k buffers Swap: 2096440k total, 0k used, 2096440k free, 291080k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1 root 15 0 2160 640 552 S 0.0 0.0 0:00.89 init 2 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/0 3 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0 4 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/0 5 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/1 6 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/1 7 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/1 8 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/2 9 root 35 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/2 10 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/2 11 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/3 12 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/3 13 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/3 14 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/4 15 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/4 16 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/4 17 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/5 18 root 38 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/5 19 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/5 20 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/6 21 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/6 22 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/6 23 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/7 24 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/7 25 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/7 26 root 10 -5 0 0 0 S 0.0 0.0 0:06.42 events/0 27 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 events/1 28 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 events/2 29 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 events/3 30 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 events/4 31 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 events/5 32 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 events/6 33 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 events/7 34 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 khelper 35 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 kthread 45 root 13 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/0 46 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/1 47 root 14 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/2 48 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/3 49 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/4 50 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/5 51 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/6 52 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/7 53 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 kacpid 189 root 11 -5 0 0 0 S 0.0 0.0 0:00.00 cqueue/0 190 root 11 -5 0 0 0 S 0.0 0.0 0:00.00 cqueue/1 191 root 12 -5 0 0 0 S 0.0 0.0 0:00.00 cqueue/2 192 root 12 -5 0 0 0 S 0.0 0.0 0:00.00 cqueue/3 193 root 13 -5 0 0 0 S 0.0 0.0 0:00.00 cqueue/4 194 root 13 -5 0 0 0 S 0.0 0.0 0:00.00 cqueue/5 195 root 14 -5 0 0 0 S 0.0 0.0 0:00.00 cqueue/6 196 root 14 -5 0 0 0 S 0.0 0.0 0:00.00 cqueue/7 199 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 khubd ps axf PID TTY STAT TIME COMMAND 1 ? Ss 0:00 init [3] 2 ? S< 0:00 [migration/0] 3 ? SN 0:00 [ksoftirqd/0] 4 ? S< 0:00 [watchdog/0] 5 ? S< 0:00 [migration/1] 6 ? SN 0:00 [ksoftirqd/1] 7 ? S< 0:00 [watchdog/1] 8 ? S< 0:00 [migration/2] 9 ? SN 0:00 [ksoftirqd/2] 10 ? S< 0:00 [watchdog/2] 11 ? S< 0:00 [migration/3] 12 ? SN 0:00 [ksoftirqd/3] 13 ? S< 0:00 [watchdog/3] 14 ? S< 0:00 [migration/4] 15 ? SN 0:00 [ksoftirqd/4] 16 ? S< 0:00 [watchdog/4] 17 ? S< 0:00 [migration/5] 18 ? SN 0:00 [ksoftirqd/5] 19 ? S< 0:00 [watchdog/5] 20 ? S< 0:00 [migration/6] 21 ? SN 0:00 [ksoftirqd/6] 22 ? S< 0:00 [watchdog/6] 23 ? S< 0:00 [migration/7] 24 ? SN 0:00 [ksoftirqd/7] 25 ? S< 0:00 [watchdog/7] 26 ? S< 0:06 [events/0] 27 ? S< 0:00 [events/1] 28 ? S< 0:00 [events/2] 29 ? S< 0:00 [events/3] 30 ? S< 0:00 [events/4] 31 ? S< 0:00 [events/5] 32 ? S< 0:00 [events/6] 33 ? S< 0:00 [events/7] 34 ? S< 0:00 [khelper] 35 ? S< 0:00 [kthread] 45 ? S< 0:00 \_ [kblockd/0] 46 ? S< 0:00 \_ [kblockd/1] 47 ? S< 0:00 \_ [kblockd/2] 48 ? S< 0:00 \_ [kblockd/3] 49 ? S< 0:00 \_ [kblockd/4] 50 ? S< 0:00 \_ [kblockd/5] 51 ? S< 0:00 \_ [kblockd/6] 52 ? S< 0:00 \_ [kblockd/7] 53 ? S< 0:00 \_ [kacpid] 189 ? S< 0:00 \_ [cqueue/0] 190 ? S< 0:00 \_ [cqueue/1] 191 ? S< 0:00 \_ [cqueue/2] 192 ? S< 0:00 \_ [cqueue/3] 193 ? S< 0:00 \_ [cqueue/4] 194 ? S< 0:00 \_ [cqueue/5] 195 ? S< 0:00 \_ [cqueue/6] 196 ? S< 0:00 \_ [cqueue/7] 199 ? S< 0:00 \_ [khubd] 201 ? S< 0:00 \_ [kseriod] 301 ? S 0:00 \_ [khungtaskd] 302 ? S 0:00 \_ [pdflush] 303 ? S 0:00 \_ [pdflush] 304 ? S< 0:00 \_ [kswapd0] 305 ? S< 0:00 \_ [aio/0] 306 ? S< 0:00 \_ [aio/1] 307 ? S< 0:00 \_ [aio/2] 308 ? S< 0:00 \_ [aio/3] 309 ? S< 0:00 \_ [aio/4] 310 ? S< 0:00 \_ [aio/5] 311 ? S< 0:00 \_ [aio/6] 312 ? S< 0:00 \_ [aio/7] 472 ? S< 0:00 \_ [kpsmoused] 551 ? S< 0:00 \_ [ata/0] 552 ? S< 0:00 \_ [ata/1] 553 ? S< 0:00 \_ [ata/2] 554 ? S< 0:00 \_ [ata/3] 555 ? S< 0:00 \_ [ata/4] 556 ? S< 0:00 \_ [ata/5] 557 ? S< 0:00 \_ [ata/6] 558 ? S< 0:00 \_ [ata/7] 559 ? S< 0:00 \_ [ata_aux] 569 ? S< 0:00 \_ [scsi_eh_0] 570 ? S< 0:00 \_ [scsi_eh_1] 571 ? S< 0:00 \_ [scsi_eh_2] 572 ? S< 0:00 \_ [scsi_eh_3] 573 ? S< 0:00 \_ [scsi_eh_4] 574 ? S< 0:00 \_ [scsi_eh_5] 593 ? S< 0:00 \_ [kstriped] 630 ? S< 0:00 \_ [kjournald] 655 ? S< 0:00 \_ [kauditd] 1860 ? S< 0:00 \_ [kmpathd/0] 1861 ? S< 0:00 \_ [kmpathd/1] 1862 ? S< 0:00 \_ [kmpathd/2] 1863 ? S< 0:00 \_ [kmpathd/3] 1864 ? S< 0:00 \_ [kmpathd/4] 1865 ? S< 0:00 \_ [kmpathd/5] 1866 ? S< 0:00 \_ [kmpathd/6] 1867 ? S< 0:00 \_ [kmpathd/7] 1868 ? S< 0:00 \_ [kmpath_handlerd] 1902 ? S< 0:00 \_ [kjournald] 1904 ? S< 0:00 \_ [kjournald] 1906 ? S< 0:00 \_ [kjournald] 1908 ? S< 0:00 \_ [kjournald] 1910 ? S< 0:00 \_ [kjournald] 2184 ? S< 0:00 \_ [iscsi_eh] 2288 ? S< 0:00 \_ [cnic_wq] 2298 ? S< 0:00 \_ [bnx2i_thread/0] 2299 ? S< 0:00 \_ [bnx2i_thread/1] 2300 ? S< 0:00 \_ [bnx2i_thread/2] 2301 ? S< 0:00 \_ [bnx2i_thread/3] 2302 ? S< 0:00 \_ [bnx2i_thread/4] 2303 ? S< 0:00 \_ [bnx2i_thread/5] 2304 ? S< 0:00 \_ [bnx2i_thread/6] 2305 ? S< 0:00 \_ [bnx2i_thread/7] 2330 ? S< 0:00 \_ [ib_addr] 2359 ? S< 0:00 \_ [ib_mcast] 2360 ? S< 0:00 \_ [ib_inform] 2361 ? S< 0:00 \_ [local_sa] 2371 ? S< 0:00 \_ [iw_cm_wq] 2381 ? S< 0:00 \_ [ib_cm/0] 2382 ? S< 0:00 \_ [ib_cm/1] 2383 ? S< 0:00 \_ [ib_cm/2] 2384 ? S< 0:00 \_ [ib_cm/3] 2385 ? S< 0:00 \_ [ib_cm/4] 2386 ? S< 0:00 \_ [ib_cm/5] 2387 ? S< 0:00 \_ [ib_cm/6] 2388 ? S< 0:00 \_ [ib_cm/7] 2398 ? S< 0:00 \_ [rdma_cm] 2684 ? S< 0:00 \_ [bond0] 2882 ? S< 0:00 \_ [bond1] 3195 ? S< 0:00 \_ [kondemand/0] 3197 ? S< 0:00 \_ [kondemand/1] 3198 ? S< 0:00 \_ [kondemand/2] 3199 ? S< 0:00 \_ [kondemand/3] 3200 ? S< 0:00 \_ [kondemand/4] 3201 ? S< 0:00 \_ [kondemand/5] 3202 ? S< 0:00 \_ [kondemand/6] 3203 ? S< 0:00 \_ [kondemand/7] 688 ? S<s 0:00 /sbin/udevd -d 2425 ? S<Lsl 0:00 iscsiuio 2432 ? Ss 0:00 iscsid 2434 ? S<Ls 0:00 iscsid 3061 ? S<sl 0:00 auditd 3063 ? S<sl 0:00 \_ /sbin/audispd 3121 ? Ss 0:00 syslogd -m 0 3124 ? Ss 0:00 klogd -x 3220 ? Ss 0:00 irqbalance 3278 ? Ss 0:00 dbus-daemon --system 3324 ? Ss 0:00 /usr/sbin/acpid 3337 ? Ss 0:00 hald 3338 ? S 0:00 \_ hald-runner 3345 ? S 0:00 \_ hald-addon-acpi: listening on acpid socket /var/run/acpid.socket 3349 ? S 0:00 \_ hald-addon-keyboard: listening on /dev/input/event1 3360 ? S 0:00 \_ hald-addon-storage: polling /dev/sr0 3413 ? Ssl 0:00 automount 3435 ? Ssl 0:00 /usr/sbin/named -u named 3466 ? Ss 0:00 /usr/sbin/sshd 4072 ? Ss 0:00 \_ sshd: root@pts/0 4078 pts/0 Ss 0:00 \_ -bash 5436 pts/0 R+ 0:00 \_ ps axf 3484 ? Ss 0:00 xinetd -stayalive -pidfile /var/run/xinetd.pid 3500 ? SLs 0:00 ntpd -u ntp:ntp -p /var/run/ntpd.pid -g 3514 ? S 0:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --pid-file=/var/lib/mysql/server.myserver.com.pid 3575 ? Sl 0:00 \_ /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --log-error=/var/lib/mysql/server.myserver.com.err --pid-fil 3687 ? Ss 0:00 /usr/sbin/exim -bd -q1h 3709 ? Ss 0:00 /usr/sbin/dovecot 3710 ? S 0:00 \_ dovecot-auth 3725 ? S 0:00 \_ pop3-login 3726 ? S 0:00 \_ pop3-login 3727 ? S 0:00 \_ imap-login 3728 ? S 0:00 \_ imap-login 3729 ? Ss 0:00 /usr/local/apache/bin/httpd -k start -DSSL 4326 ? S 0:00 \_ /usr/bin/perl /usr/local/cpanel/bin/leechprotect 4332 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 4333 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 4334 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 4335 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 4336 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 4337 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 4382 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 4383 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 4384 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 5389 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 5390 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 3741 ? Ss 0:00 pure-ftpd (SERVER) 3746 ? S 0:00 /usr/sbin/pure-authd -s /var/run/ftpd.sock -r /usr/sbin/pureauth 3759 ? Ss 0:00 crond 3772 ? Ss 0:00 /usr/sbin/atd 3909 ? S 0:00 cpsrvd (SSL) - waiting for connections 5435 ? Z 0:00 \_ [cpsrvd-ssl] <defunct> 3931 ? S 0:00 queueprocd - wait to process a task 3948 ? S 0:00 tailwatchd 3954 ? SN 0:00 cpanellogd - sleeping for logs 4003 ? Ss 0:00 ./nimbus /opt/nimsoft 4016 ? S 0:00 \_ nimbus(controller) 4053 ? Sl 0:00 \_ nimbus(spooler) 4066 ? S 0:00 \_ nimbus(hdb) 4069 ? S 0:00 \_ nimbus(cdm) 4070 ? S 0:00 \_ nimbus(processes) 4023 ? S 0:00 /usr/sbin/smartd -q never 4027 tty1 Ss+ 0:00 /sbin/mingetty tty1 4028 tty2 Ss+ 0:00 /sbin/mingetty tty2 4029 tty3 Ss+ 0:00 /sbin/mingetty tty3 4030 tty4 Ss+ 0:00 /sbin/mingetty tty4 4031 tty5 Ss+ 0:00 /sbin/mingetty tty5 4033 tty6 Ss+ 0:00 /sbin/mingetty tty6 4035 ttyS1 Ss+ 0:00 /sbin/agetty -h -L ttyS1 19200 vt100 vmstat 10 6 procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 0 0 0 3718136 25684 257424 0 0 8 3 127 189 0 0 100 0 0 0 0 0 3718136 25700 257420 0 0 0 7 1013 1500 0 0 100 0 0 0 0 0 3718136 25700 257424 0 0 0 1 1013 1551 0 0 100 0 0 0 0 0 3718136 25700 257424 0 0 0 0 1012 1469 0 0 100 0 0 1 0 0 3712680 25716 257424 0 0 0 2 1013 1542 0 0 100 0 0 0 0 0 3718376 25740 257424 0 0 0 46 1017 1534 0 0 100 0 0 Can anyone advise me as to what is the cause of and how I may resolve this behaviour? A kernel/driver conflict perhaps? I don't see any processes in R or D state that might inflate the load averages artificially, I realise it may be considered low in an 8 thread system but its higher at idle than any normal behaviour I've previously come across. Thanks in advance for your time. Edit: iotop Total DISK READ: 0.00 B/s | Total DISK WRITE: 0.00 B/s TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND 26 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.29 % [events/0] 3205 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.10 % [kondemand/2] 3208 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kondemand/5] 3209 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kondemand/6] 3207 be/3 root 0.00 B/s 0.00 B/s 0.10 % 0.00 % [kondemand/4] 3210 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kondemand/7] 3227 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % irqbalance 3288 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rpciod/1] 3287 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rpciod/0] 3206 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kondemand/3] 3069 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % auditd 3070 be/2 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % audispd 655 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kauditd] 3619 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % automount 3 be/7 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [ksoftirqd/0] 3068 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % auditd 29 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [events/3] 4 rt/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/0] 7 rt/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/1] 10 rt/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/2] 13 rt/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/3] 16 rt/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/4] 19 rt/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/5] 22 rt/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/6] 25 rt/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/7] 27 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [events/1] 28 be/3 root 0.00 B/s 0.00 B/s 0.29 % 0.00 % [events/2] 30 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [events/4] 31 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [events/5] 32 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [events/6] 33 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [events/7] 34 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [khelper] 35 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kthread] 45 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kblockd/0]

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• Caching DNS server (bind9.2) CPU usage is so so so high

  - by Gk.

  I have a caching-only dns server which get ~3k queries per second. Here is specs: Xeon dual-core 2,8GHz 4GB of RAM Centos 5x (kernel 2.6.18-164.15.1.el5PAE) bind 9.4.2 rndc status: recursive clients: 666/4900/5000 About 300 new queries (not in cache) per second. Bind always uses 100% on one core on single-thread config. After I recompiled it to multi-thread, it uses nearly 200% on two core :( No iowait, only sys and user. I searched around but didn't see any info about how bind use CPU. Why does it become bottleneck? One more thing, here is RAM usage: cat /proc/meminfo MemTotal: 4147876 kB MemFree: 1863972 kB Buffers: 143632 kB Cached: 372792 kB SwapCached: 0 kB Active: 1916804 kB Inactive: 276056 kB I've set max-cache-size to 0 to make sure bind can use as much RAM as it want, but it always stop at ~2GB. Since every second we got not cached queries so theoretically RAM must be exhausted but it wasn't. Do you have any idea? TIA, -Gk

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• High Availability

  - by Barrett

  Has anyone setup Advantage Database Server using a failover cluster? If so, did it work and do you have any tips or tricks that you can share?

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• How to configure HA iSCSI for Solaris 10

  - by Noah

  BACKGROUND: We have a StarWind NAS that we are currently using for High Availability storage with our Windows network. Starwind has mirrored drives and multiple ip paths, that the Windows Server combines into one HA disk store. QUESTION: How do I accomplish the same thing under Solaris 10? I've looked at ZFS but to document seems to indicate that ZFS wants to do its own raid/mirroring. I can also attach via iSCSI from Solaris and am presented with both drives being served by the Starwind NS. So, how do I configure solaris so that disk M1 and M2 are considered as a single fault tolerant drive?

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• High memory utilization with firebird + windows server 2008 r2

  - by chesterman

  i have a Windows Server 2008 R2 (64bit) running a 64bit installation of Firebird 2.1.4.18393_0 in a 4GB phisical server. After a while, the task manager show that all memory is used, but the sum of the memory of all process does not stack to the half of the memory. Unfortunally, it's start swapping. Using RAMMAP, i can see that my entire database file is mapped into the memory. This only occours in windows server 2008 r2 and windows 7 64 bit. i can use firebird 32 or 64bit installations, doesn't matter. How can i prevent this? Why this only occours in w2k8r2 and w7? tks in advance ** UPDATE Aparently, this occours by the use of all memory by the file system cache. The microsoft documentations explain that this WAS a issue in windows xp, 2k3, vista and 2k8, but it was solved in 7 and 2k8r2. also adds that this issue is more common in 64bit hosts. (http://support.microsoft.com/kb/976618) there are some tools (DynCache, setcache and the Get/SetSystemFileCacheSize system calls from windows API) that allows me to fix a upper limit to the memory usage by the fscache, but the documentation argues that i should not do this in w2k8r2 because it will severely impact on the overall system performance. anyway, i tried, the performance remained the same shit and the use of the page file remained, although there is now more the 1gb of free memory.

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• Hard disk permission after bootcamp ??

  - by Sladiki

  Hi all, I have a question concerning hard disk permission after Using boot camp, i have a macbook pro 17 i7, 500gb, yesterday i installed window 7 ultimate in 80 gb (bootcamp) ntfs offcourse. I was testing my HD permission since i found that the start up is slow in mac side. I found there's alot of changes in permissions is that normal or i should to repair all this permission problems, need to mention that from Windows side i can see my mac drive which i don't want... Any idea... Regards, Sami

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• High shmmax value in Redhat 6.3

  - by xpapad

  We are using Redhat 6.3 with 30G RAM to host our Postgres server. The (default) shmmax value is 68,719,476,736 In some forums I have read that having an shmmax value larger than the RAM causes extensive paging, but in the Redhat forums it warns against changing a kernel parameter that is already configured to a value larger than the minimum requirements for an environment. In ServerFault I've read that this probably has no impact. So is there any impact of having shmmax value RAM in a DB server, or the kernel understands this and handles it appropriately? Thanks

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• High-performance Academic Server [closed]

  - by PHPsmith

  Suppose I want to build a server for the university's academic interests. The server is dedicated only to a site, where users (students and lecturers) just view and fill the academic data. But at a time (e.g. once a semester), about 12,000 students will access the site simultaneously. Due to limitation of resources, I have to build the server using free software (except for the operating system Windows 7, the university has been prepared). The hardware is also limited to the usual 4-core computers (eg, Ivy Bridge Intel Core i7-3770) with approximately 16GB of memory (DDR3 1600 MHz), equipped with an RJ-45 port (Intel 82 579 Gigabit Ethernet). With all these limitations, I have to choose the software (web server, database, etc) are appropriate for this purpose is achieved. I decided to create a site in PHP. Please help me by answering the following questions based on your expertise. (my prime candidate software to consider after googling) Web server which is faster & stable & secure, when implemented and optimized for PHP? And why? (nginx) PHP accelerator which is faster & stable & compatible with the selected web server? And why? (APC with Zend Optimizer+) Database which is faster & stable & secure, when implemented and optimized for selected web server and selected PHP accelerator? (MySQL) Are there any errors that have been or will be happening from my condition is? If there is, please enlighten me? Is there anything else I need to know in order to achieve this goal? If there is, please enlighten me? I understand that the performance also depends on the implementation of source-code program, so I assume it will create a site with the best efficiency (e.g. using AJAX).

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• High resolution on small screen

  - by Andrew Cetinick

  I just purchased a new ultrabook (Asus UX32VD). Awesome laptop, but I am having trouble using it with its native resolution being 1920 x 1080. Text is so small and hard to read. I have increased the text size in the display options but it don't really improve it for all scenarios, especially in webpages. I am wondering if there is a possible solution to this? Simply lowering the resolution makes everything look pixelated.

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• System Lags/Freezes when under high usgage

  - by tom

  I am not sure if its my GPU / Memory or Hard drive thats failing. For example if I'm runnning more than one instance of chrome and running an application that takes up a lot of resources, my system will start to lag and freeze. When I launch Photoshop the GPU feature disables automatically, this also lags when I click on menus and when working on documents in Photoshop. I really dont know where to start, if i should buy a new graphics card or test the memory or could it be my OS drive? System: Windows 7 64bit, ATI Raedeon 5850, Corsair 2x4GB http://i.stack.imgur.com/qqkLZ.jpg

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• Multi domain server with dedicated SSL's HA

  - by user3692800

  I am hosting a server with 150 domain names (websites), each of the ssl's requere dedicated IP address. So server windows 2008, with 150 IP addressees and 150 websites. I need to have high availability solution. So thinking setting up AWS but ELB will not be a solution... and max IP's I can get per instance is 12 addresses. So what can I do to have all 150 sites hosted on one instance and be HA with instance in different availability zone.

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• ADSL2+ - High sync-rate, good line attenuation, but low noise margin and slow speeds

  - by Mark Pim

  I've been with my ISP (IdNet) for a few months and have been getting some good speeds, but in the last week the speed has dramatically decreased (from 15 Mbps+ to around 0.2 Mbps). This happens at all times of day, not just peak periods. Obviously I've done all I can to isolate problems my end - only one PC is connected to the router (via ethernet cable) and no other background programs are using the network etc. I've raised the issue with the ISP and they've suggested trying a new ADSL filter to see if that is casuing the problem, but I thought it would also be good to get the opinion of superuser on possible causes or other troubleshooting I can do. Here are the juicy stats :) My router (Netgear DGN1000) reports: Downstream Upstream Connection Speed 17602 kbps 1062 kbps Line Attenuation 17.9 db 8.6 db Noise Margin 6.0 db 6.1 db I used RouterStats and it seems to show those figures stay fairly consistent all the time I ran the BT speedtest and it reported: download speed of 164 kbps, out of a max achievable of 21000 kbps upload speed of 859 kbps, out of 1048 kbps DSL connection rate 17719 kbps down and 1048 kbps up IP Profile of 15000 kbps Is there any more troubleshooting I can do? Does this look like a problem with my equipment / wiring or with BT's line? Any advice would be great :)

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• How do I activate the F_LINE input in a transplanted HP chassis?

  - by admin

  I have an HP Pavilion Media Center PC chassis, vintage 2003 or so and I replaced the motherboard in it with a newer (vintage 2009) HP motherboard, M2N68-LA (Narra 5). I have scoured the internet trying to find pinouts for the motherboard to no avail. My question concerns the front panel audio, specifically Line In. The old chassis was built for AC97 but the new mobo is build for the newer HD audio standard. I figured out by comparison & experimentally how to connect the Mic & Headphone jacks to the HD audio header of the mobo by adding a manual switch to set the SENSE lines. Now all works fine for Mic & headphone. The old chassis also has a front panel Line In jack that the newer HP chassis does not have. However, the new mobo has a 4 pin white connector labeled F_LINE that I believe is a line input. Under Windows 7 I see the two Line Inputs in the mixer but I can't get one of them to become active. The 4 pin F_LINE connector uses the two middle pins for ground, and presumably the other two for left and right audio inputs. There are no pins for sensing on that connector. Can anyone tell me how to use that F_LINE input for the front panel, or how to activate it?

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• Super simple high performance http server

  - by masylum

  I´m building a url shortener web application and I would like to know the best architecture to do it in order to provide a fast and reliable service. I would like to have two separate servicies in different machines. The first machine will have the application itself with a apache, nginx, whatever.. The second one will contain the database. The third one will be the one that will be responsible to handle the short url petitions. For the third machine I just need to accept one kind of http petition (GET www.domain.com/shorturl), but it have to do it really fast and it should be stable enough. Which server do you recommend me? Thank's in advance and sorry for my english

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• Windows server response time very high

  - by Nagaraju Bandla

  Server Specs Windows Server 2008 R2 64 bit Provider : Fasthosts .Net Framework: 4.0 6 GB RAM (its using 4.6 GB) i have a website with thousands of pages structured like folderone/1/one to 500.aspx folderone/2/one to 500.aspx . . folderone/500/one to 500.aspx To load this pages for the first time after the release, for each folder it takes about 20 to 30 minutes and once one page is loaded the rest of the pages loads fine. This happens for all folders. And this repeats every time i restart the server, when a added anything to app_code or if i change the web.config. My site is mainly works Google and due to this problem its giving errors. Any help will be highly appreciated please. i am happy to buy a beer for you if its resolved. Thanks in advance...

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• apache high system CPU time

  - by jperelli

  I have a web server: ubuntu apache+php app+postgresql and a stats server: ubuntu apache+php - piwik and munin2 installed. The communication for munin2 is made through ssh. In munin i see a lot of system cpu activity, that I assume it it because of apache (i see 5 or 6 apache instances using ~5% CPU on top) I was not having this system CPU activity before. Does anyone knows how can I see where that comes from? EDIT: some munin graphs

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• Cherokee high virtual memory usage even after disabling I/O Cache

  - by nidheeshdas

  I've Ubuntu 10.04LTS 64-bit running on a openvz container and Cherokee 1.0.8 compiled from source. The virtual memory usage of cherokee-worker is around 430 MB even after disabling I/O cache from Advanced - I/O Cache - NOT enabled. Is this issue particular to openvz? Because many people reported to have successfully reduced virt memory usage by disabling io cache. htop output: http://imgur.com/z5JEL.jpg (newbies not allowed to post image.) thanks in advance. nidheeshdas

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• How can I best explain what a virtual machine "image" is to a non-technical person?

  - by cagcowboy

  Does anybody have a good description or know where I could find one?

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• High Steal Time utilization on Apache Linux Server

  - by JMC

  I have a CentOS "development / testing" server that runs extremely slowly. It's running Apache and Mysql using PHP. Top reports that 98% of the CPU utilization is frequently spent on "st" - Steal Time. What could cause a server to spend so much CPU on steal time, and how can I diagnose the problem? I didn't notice the problem until after I granted a third party developer root access (for all I know it has a root kit running, though unlikely).

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• How to setup a simple Ubuntu Server Tomcat cluster on VirtualBox for testing?

  - by Alex Pakka

  I am looking for a step by step instructions to setup at leat two (and later more) simple Ubuntu Virtual Core 12.10 Server VMs on Oracle VirtualBox under Windows 7 64bit. The test setup would be: Apache HTTP server on the Windows host acting as a Load Balancer. The result will be that going to http://localhost:8080 would balance between two nodes and prove session replication. Two lean, small footprint Ubuntu Server guest nodes with Java 7 and Tomcat 7. The intention is to help everyone doing High Availability / Load Balancing development and testing to create a reasonable environment on the local workstation or mainstream notebook in as little time as possible.

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