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• Rail's FileStore with Linux Disk Caching or RAMdisk?

  - by Yo Ludke

  I have a Ruby on Rails application that stores it's catched files on the filesystem (Rails file-system cache). I was thinking about changing to memcached Store, but a short test shows it isn't a big difference in speed. From linuxatemyram.com I learned a bit about file caching. On the current machine there would be around 40..45GB RAM left which isn't needed for the application and which can be used to linux-disk-cache this rails file cache store. The disk is a RAID10 system with almost 120MB disk perfomance. How can I tell Linux to use free RAM more deliberately and not to be shy about using it? Do think it's necessary to adjust a sysyctl/.. value here, or would I have performance advantages to put the File Store root diretory on a ramdisk? (Loosing the cache during a reboot wouldn't be a problem)

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• iTunes command+tab does not bring main window the foreground after command+h

  - by ecoffey

  Related to : Cmd-Tab does not bring iTunes to foreground There people claim that command+h will continue to work, but the behavior I'm seeing is: Launch a full screen Terminal instance (or anything else really) Launch a fresh iTunes command+h to hide it command+tab back to iTunes, this works and the main app window is given focus command+tab to Terminal command+tab to iTunes What I expect to happen: the main iTunes window is brought to the foreground and given focus. What does happen: The application menu bar shows iTunes, but an additional command+` is needed to bring the main app to foreground. I thought it might have been related to a Chrome interaction, since I'm usually commmand+tabbing between my browser and everything else, but that does not seem to be the case. I do have two "plugins" running: last.fm scrobbler Alfred app mini itunes player interface Not sure if either of those create some phantom window or something that is mixing something up. Versions of stuff: OS X: 10.6.5 iTunes: 10.1.1 (4) last.fm: can't find it, but it's recent Alfred: 0.8 (89) So after that big long rant, anyone else seeing this behavior?

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• Virtualhost setup, same IP address, different DirectoryIndex's

  - by kaykills

  I am trying to set up 2 virtual host entries in apache but I'm not sure how to accomplish what I want to do. I have two domain names, both pointing to the same IP Address. I need the DirectoryIndex to be different, which is pretty much the only difference in the entries. I have the following set up: <VirtualHost *:80> ServerName firstdomain.com ServerAdmin [email protected] DocumentRoot "/srv/www" DirectoryIndex /portals/site/index.html </VirtualHost> <VirtualHost *:80> ServerName seconddomain.com ServerAdmin [email protected] DocumentRoot "/srv/www" DirectoryIndex /portals/site/index_fr.html </VirtualHost> Not sure what I need to do differently but the second entry doesn't work. The only real difference is I need the second domain to point to a different DirectoryIndex. If there is a better way to accomplish this, your help would be appreciated.

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• Postgresql spawning a ridiculous number of postmaster processes

  - by Kevin Loney

  For some reason postgres is spawning 700 postmaster processes for handling database requests and the postgres log file if full of 'unexpected EOF on client connection', 'incomplete startup packet' and 'sorry, too many clients already'. netstat tells me that all the open connections are local and I'm pretty sure are coming from postgres internally. This particular instance has been running just fine for the last 230 days or so and nothing has changed configuration wise. Any thoughts on where I should be looking to try and resolve this issue? This is my first time diagnosing a problem like this so if there is any steps I can take to help narrow down the cause that would be helpful as well.

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• Windows Home Server - Can't log in - A problem is preventing Windows from accurately checking the license for this computer. Error Code: 0x8007007e

  - by 1337ingDisorder

  Subject header pretty much covers it. I have a windows Home Server which can only be accessed through remote desktop. I could log in for ages, but for the past couple weeks I haven't been able to log in. As soon as I enter my username/password and click OK, I get an alert dialog stating the following: "A problem is preventing Windows from accurately checking the license for this computer. Error Code: 0x8007007e" When I click "Ok" (the only option) the dialog closes and my remote session closes. How can I get around this? I've tried powering down the machine and powering it back up. Same results.

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• Set 802.1Q tagged port on VLAN1 on Dell PowerConnect switch

  - by Javier

  I'm having big troubles when adding this Dell switch to my network. Here we use several VLANs to segment traffic. All switches (3com and DLink mostly) have configured the same VLANs, most ports are 'untagged' and belong to a single VLAN, except for the ports used to join together the switches (in a star topology), these ports belong to all VLANs and use 802.1Q tags. So far, it works really well. But on this new switch (a Dell PowerConnect 5448), the settings are very different (and confusing). I have configured the same VLANs, an the uplink ports are set in 'general' mode (supposed to be fully 802.1Q compliant), I can set the VLAN membership as 'T' on these ports for all VLANs except VLAN 1. It always stay as 'U' on VLAN 1. Any ideas?

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• Windows Explorer slow response when disconnect from the network

  - by ITGuy24

  As a Systems Admin I have seen this issue repeatedly and it drives me crazy. Basically the problem occurs when you open My Documents or My Computer (Windows Explorer) there is a big delay ranging from 5-25 seconds before it actually opens and shows the content. Sometimes the problem continues with each subfolder you open. The problem is most common when disconnected from the network and when you have mapped drives. The most common solution for this problem is to disconnect any mapped drives or printers that are discconected/not reaachable. I have also heard that turning off "Automatically search for network folders and printers" can solve this issue but I have yet to see this work. Does anyone know of any other work arounds for this?

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• How do I disable aalert beeps

  - by wheresrhys

  My HP pavilion laptop is getting pretty old and the speakers no longer work properly. So I've disabled all audio devices, including disabling the light-touch volume controls at boot-up. The one sound still here that I can't get rid of is teh alert beep whenever there's an error. It's annoying at the best of times, but when your laptop has no other sounds at all it's intensly irritating! Nothing I chaneg in the windows settings or in the BIOS seems to have any effect. Any ideas how to switch them off?

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• IIS6 Front Page Extension: Set Reply-To in Webbot mailers

  - by hurikhan77

  We are running some old legacy IIS6 websites with frontpage extensions. The contact forms (using webbot frontpage extension) use the administrators email address as from address which is pretty cumbersome as our customers tend to click just reply in the requests they receive and we always get these mails and have to bother about them. How do you set a reply-to per webbot form? Or how do you set a from or reply-to globally per IIS6 vhost? In the HTML code it looks like this: <!--webbot bot="SaveResults" S-Email-Format="TEXT/PRE" S-Email-Address="[email protected]" ... --> But this is the recipient address. Additional question: Will it be sufficient to just change this code? Or do I need to apply settings elsewhere?

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• PuTTY/SSH: How to Prevent Auto-Logout?

  - by feklee

  My ISP's SSH server (Debian 2.0) logs me out after 35 minutes of inactivity, when connected with PuTTY (Windows XP). This is a big problem when I utilize the server for port-forwarding. The final messages displayed in the terminal: This terminal has been idle 30 minutes. If it remains idle for 5 more minutes it will be logged out by the system. Logged out by the system. PuTTY options that do not help: Sending of null packets to keep session active. Seconds between keepalives (0 to turn off): 30 [x] Enable TCP keepalives (SO_KEEPALIVE option) Any idea how to avoid the auto-log-out? Should I try another SSH client?

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• 64bit on core i5 with 2GB DDR3 RAM?

  - by Jacques

  Core i5 2.3 Ghz processor 512mb ATI HD 4570 2GB 1333 RAM 64bit Windows 7 Home Premium. Should I "down-grade" to 32bit? Does running 64bit with only 2GB RAM make the laptop weaker than running 32bit with 2GB RAM or is the performance pretty much the same? Is there any performance benefit to running 64bit with only 2GB RAM? Is there an impact on battery life between 64bit and 32bit. Should I maybe just add another 2GB RAM? Thanks.

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• Monit can't detect MySQL, but I can

  - by Matchu

  Monit is configured to watch MySQL on localhost at port 3306. check process mysqld with pidfile /var/lib/mysql/li175-241.pid start program = "/etc/init.d/mysql start" stop program = "/etc/init.d/mysql stop" if failed port 3306 protocol mysql then restart if 5 restarts within 5 cycles then timeout My application, which is configured to connect to MySQL via localhost:3306, is running just fine and can access the database. I can even use MySQL Query Browser to connect to the database remotely via port 3306. The port is totally open and possible to connect to. Therefore, I'm pretty darn certain that it's running. However, running monit -v reveals that Monit cannot detect MySQL on that port. 'mysqld' failed, cannot open a connection to INET[localhost:3306] via TCP This happens consistently, until Monit decides not to track MySQL anymore, as configured. How can I begin to troubleshoot this issue?

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• Importing Delicious export into Firefox 3

  - by Jordan Reiter

  The HTML export file from Delicious creates an HTML file that, while importable into Firefox, loses all of the tags, which pretty much misses the point of delicious. Every link I've found to do the import doesn't work: The online converter Delicious-to-Firefox 3 keeps throwing a server error; the "better" version is down I tried using the trick of syncing Delicious bookmarks to Flock and then restoring that file to my Firefox browser. Although the bookmarks are in Firefox, they don't show up anywhere. I know they're in Firefox because when I create a backup file, they're in the JSON file but they refuse to show in the browser anywhere (clicking on any tag shows an empty list) Basically, I'm looking for someone who has successfully imported their delicious bookmarks, with tags, into Firefox 3.6.13 (Mac).

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• HDFS datanode startup fails when disks are full

  - by mbac

  Our HDFS cluster is only 90% full but some datanodes have some disks that are 100% full. That means when we mass reboot the entire cluster some datanodes completely fail to start with a message like this: 2013-10-26 03:58:27,295 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Mkdirs failed to create /mnt/local/sda1/hadoop/dfsdata/blocksBeingWritten Only three have to fail this way before we start experiencing real data loss. Currently we workaround it by decreasing the amount of space reserved for the root user but we'll eventually run out. We also run the re-balancer pretty much constantly, but some disks stay stuck at 100% anyway. Changing the dfs.datanode.failed.volumes.tolerated setting is not the solution as the volume has not failed. Any ideas?

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• CVSNT to CVSNT Migrations

  - by BParker

  Has anybody re-homed a CVSNT installation? I need to take a CVSNT setup on one ageing server and relocate it to a new shiny server, but i don't have a great deal of experience with this software. Does anyone know the basic process for moving an entire repository to a new server? We have 3 base repositories, totaling about 6GB. Size wise it's not too big, but i need to make sure all the history is migrated correctly. I've googled around a bit, but not managed to find any info on this kind of move, everyone seems to prefer to write how-to's on moving to Subversion et al.... The CVSNT server is running on windows if that makes a great deal of difference....

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• Win 7 Home Premium 64 bit running Cobian Backup 11 (Gravity)

  - by Andrew

  I'm really enjoying Cobian 11, but am fairly new to it. My question is this. I back up a pretty large folder on a regular basis. I started off by doing a Full backup, and have followed that monthly using differential backups. I was told that, to restore my computer after a crash, I need to copy back the original full backup AND copy back the latest differential over the full. That's fine. However, over the months there are quite a few large differential backups dated between the original Full one and the latest differential one. To free space on my backup HD, can I every now and then delete the differential backups that lie between the original Full and the latest differential, and just leave the original Full and the latest differential backup on the HD?

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• How to make iTunes download all podcast episodes irrespective of listened/not

  - by user15660

  I am a big iPod user (especially podcasts). I have used iPod touch, iPod classic and iPod nano. I noticed that iTunes stops downloading podcasts that you no longer listen to and stops downloading them. Is there a way to force iTunes to download all episodes of podcasts irrespective of whether you listen to them or not? I am not interested in just clicking a episode to make iTunes think that I'm listening. I need some kind of programmatic work around or batch script that runs and updates all podcasts/episodes automatically.

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• CPU spikes on small site- possibly apache or php config related

  - by Mike

  Hello, I hope you can help me. I have a site that I'm moving to a new datacenter. The server is pretty much vanilla, no control panel, and also no optimizations. When I hit a page, the site takes an extremely long time to load, despite it being relatively light weight. I ran top to see what was happening, and the cpu jumps to 75%, and drops back down to about 20% while the rest of the page is loading. Someone suggested that I ran lsof -p on the offending processes, but I'm not sure what I'm looking at. I ran through my httpd.conf file and commented out a bunch of loaded modules that didn't seem necessary, but that didn't help either. Anyone have any ideas? Output of the lsof http://pastebin.com/mfa113f

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• Juniper SRX1400 VPN

  - by ank

  I have been trying to set up a client VPN on a Juniper SRX1400 without much success. All documentation I found from Juniper and elsewhere does a lot of other (difficult and wonderful) things other than the simple things I want to do. We already have a VPN running on CISCO PIX hardware which we need to put to rest and we pretty much like to replicate the functionality, which is: 1) client makes a request to the outside interface of the SRX1400, 2) client gets authenticated, 3) if successful, then client is assigned all the usual DHCP stuff and becomes part of the network. What privileges this DHCP assigned network has, should be configurable of course with the usual routing/filtering methods. Am I asking for too much from the SRX for this kind of thing? Should I ditch the SRX for VPN and revert to an OpenVPN solution that I had working some time back also and was amazed at the ease of configuration, functionality and features?

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• periodically overridding NTP for simulation purposes

  - by Gerard

  I have this situation: NTP is used to sync time on a set of Windows 7 and Server 2008 machines. Nothing out of the ordinary about this. periodically on this system, the time needs to be changed for testing/training purposes (it is a training simulation system that has a lot of time-dependent operations). My question: As NTP in general does not really like big time jumps or changes AFAIK, is there a standard way this could be set up to allow the clock to be changed at the root NTP server in the system and have it propagate through the system in a reasonable amount of time (a minute or two?) It is not acceptable to disable and/or restart all NTP client services to achieve this. Any ideas? It would be nice to do this without writing some kind of custom script to disable services and update clocks all over the place. Thanks in advance.

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• FreeBSD Ngnix installation error

  - by Asaf Nevo

  I have a VPS which has Apache webserver installed. I'm trying to install Ngnix on it since my new server will be needing to handle large amount of connection simultaneously. I used this install guide and did: cd /usr/ports/www/nginx make install clean However I get this error: adding module in /usr/ports/www/nginx/work/arut-nginx-dav-ext-module-0e07a3e ./configure: error: no /usr/ports/www/nginx/work/arut-nginx-dav-ext-module-0e07a3e/config was found ===> Script "configure" failed unexpectedly. I'm pretty new to FreeBSD and I am used to controlling my server using Direct Admin. What shall I do next ?

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• forced reformat without login / and bootcamp

  - by debug

  ok.. im pretty good with stuff like this, but I have a question. I have mac mini with 10.5.(x) on one partition, and bootcamp (windows) on the other. My boss wants me to reformat the whole mac (10.6 (x)), which is usually easy. He does not remember his password to login, which means I cannot log in and allocate the bootcamp back to one partition using Disk Utility, then reformat the whole drive. When I insert the Snow leopard CD, I can only wipe out one partition, my question is: Is there a way to force a wipe out of both drives in the boot sequence? Any help to wipe out this whole drive and do a clean install would be helpful.. Thanks superusers!

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• Brand new Lenovo u410 heats up around touchpad

  - by Ali

  My Lenovo u410 started heating around the right palm rest minutes after I unpacked it! I am devastated, because I bought this for programming, and it's impossible to type on this for extended periods with the surface getting so hot. I haven't run any serious programs on it yet, so the processor has been pretty much idle. I've been Googling this problem, and found only one person who had this issue too. Is this is a defect in the product? Why aren't many others getting this problem? I bought it via newegg.com and as per their policy you can't return a product once you've opened it. Specs: Core i5, 6 GB RAM, 750 GB harddisk. Running Windows 8.

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• What's the best way to clean up after a fork bomb?

  - by raldi

  $ ls bash: no more processes Uh oh. Looks like someone made a fork bomb. Where I used to work, this pretty much meant that the shared server would need to be power-cycled, since even the sysadmins with root often couldn't get the problem cleaned up. Often, they couldn't even get a prompt. I've heard a few tricks (notably, to send STOP signals rather than KILL signals, since the latter would allow the remaining threads to immediately replace the killed ones), but I've never seen a comprehensive guide entitled So, You Have Yourself a Fork Bomb? Let's make one.

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• Calculating IOPS for a single HDD - what am I doing wrong?

  - by red888

  So I know there is no standardized way of calculating IOPS for a HDD, but from everything I have read it appears one of the most accurate formulas is the following: IOP/ms = + {rotational latency} + ({block size} / {data transfer rate}) Which is IOs per millisecond or what the book I've been reading calls "Disk Service Time". Also rotational latency is calculated as half of one rotation in milliseconds. This was taken from the EMC book "Information Storage and Management" -arguably a pretty reliable source right\wrong? Putting this formula into practice consider this Seagate data sheet. I am going to calculate IOPS for the ST3000DM001 model for a block size of 4kb: Seek Average (Write) = 9.5 -I'll measuring IOPS for writes Spindle speed = 7200rpm Average Data Rate = 156MB/s So my variables are: Seek Time = 9.5ms Rotational latency = (.5 / (7200rpm / 60)) = 0.004s = 4ms Data Rate = 156MB/s = (0.156MB/ms / 0.004MB) = 39 9.5ms + 4ms + 39 = IO/ms 52.5 1 / (52.5 * 0.001) = 19 IOPS 19 IOPS for this drive clearly is not right so what am I doing wrong?

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