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• Linux IO scheduler on databases with RAID

  - by Raghu

  Hi, I have a linux database(MySQL) server(Dell 2950) with a 6-disk RAID 10. The default IO scheduler on it is CFQ. However, from what I have read and heard, there is no need for a scheduler like CFQ when reordering/scheduling is also done by underlying RAID controller; on the contrary since it does not account underlying RAID configuration into account performance may actually degrade with CFQ. The primary concern is to reduce CPU usage and improve throughput. Also, I have seen recommendations of using noop/deadline IO scheduler for databases primarily because of the nature of their R/W access.

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• Case in-sensitivity for Apache httpd Location directive

  - by user57178

  I am working with a solution that requires the usage of mod_proxy_balancer and an application server that both ignores case and mixes different case combinations in URLs found in generated content. The configuration works, however I have now a new requirement that causes problems. I should be able to create a location directive (as per http://httpd.apache.org/docs/current/mod/core.html#location ) and have the URL-path interpret in case insensitive mode. This requirement comes from the need to add authentication directives to the location. As you might guess, users (or the application in question) changing one letter to capital circumvents the protection instantly. The httpd runs on Unix platform so every configuration directive is apparently case sensitive by default. Should the regular expressions in the Location directive work in this case? Could someone please show me an example of such configuration that should work? In case a regular expression can not be forced to work case insensitively, what part of httpd's source code should I go around modifying?

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• How can I fix a computer that is literally too slow to do anything?

  - by fredley

  I'm troubleshooting a Windows 7 PC for a friend. A couple of days ago it started running 'slow'. It turns out 'slow' is about 15 minutes to the first glimpse of the desktop, and another 30 to show icons. It is possible to open Task Manager, and nothing seems awry, CPU usage at 1-5%, plenty of memory free. The machine is clearly infested with malware though, in particular a program called 'Optimizer Pro' is demanding money to 'remove 5102 files slowing down my computer'. This seems highly suspicious. My problem is though, that I can't access msconfig (I left it for a couple of hours after having hopefully typed it into the Start Menu and hit enter - nothing seems to have loaded), or anything at all basically. I can boot from a Linux Live CD, but can I actually do anything useful from there? System Restore hasn't fixed it either, and Safe Mode exhibits the same behavior.

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• grep only returns help text

  - by Pete Mancini

  Well, I am perplexed. I am working with an Ubuntu server and I type in grep 'bash' *.sh BUT fgrep 'bash' *.sh works like a champ. which grep and which fgrep both point to their respective executables in /bin. I am perplexed as to what I am doing wrong. EXAMPLE output: $ grep -F 'grounding' repl.clj Usage: grep [OPTION]... PATTERN [FILE]... Search for PATTERN in each FILE or standard input. PATTERN is, by default, a basic regular expression (BRE). Example: grep -i 'hello world' menu.h main.c $ fgrep 'grounding' repl.clj (p/concepts-for-grounding-term imp1 "PERSON" "summary") See? grep is failing but fgrep is working fine. That is why I am perplexed.

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• Eliminating Windows 7 user tracking registry writes

  - by caffiend

  Windows 7 continues the practice of saving user actions in the registry. I'd like to disable this practice both to avoid reg-file fragmentation and SSD wear, as well as being uncomfortable with programs being able to quickly analyze my usage habits. Even with the "Turn off user tracking" policy enabled, there are at least two areas that still contain user tracking: HKCU\Software\Classes\Local Settings\MuiCache This key stores a cache of most-recently accessed strings, including most-recently ran exe descriptions. MKCU\Software\Classes\Local Settings\Software\Microsoft Windows\Shell\BagMRU This directory stores the most recently viewed folders along with timestamps. Are there additional policy settings/registry entries to disable these writes? If not, is it possible to make these entries Volatile? Would it be practical to create a temporary hive (eg, on ramdisk) and map it over this location?

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• Is it safe to use up all memory on linux server, not leaving anything for the cache?

  - by Temnovit

  I have a CentOS server fully dedicated to MySQL 5.5 (with innodb tables mostly). Server has 32 GB RAM, SSD disks, and avarage memory usage looks like this: So about 25GB is in use and about 6.5GB is cached. I am experiencing performance problems with WRITE queries, so I was thinking, is this the optimal cache size? I might increase innodb buffer size, so that linux cache would become smaller, or decrease it, so it would be bigger. What is the optimal used/cached memory balance for busy MySQL server on linux?

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• Windows Server doesn't connect to a network share

  - by Dmitriy N. Laykom

  Windows Server doesn't connect to a network share. Network share is working. Blockquote Pinging 109.123.146.223 with 32 bytes of data: Reply from 109.123.146.223: bytes=32 time<1ms TTL=63 Reply from 109.123.146.223: bytes=32 time<1ms TTL=63 Reply from 109.123.146.223: bytes=32 time<1ms TTL=63 Ping statistics for 109.123.146.223: Packets: Sent = 3, Received = 3, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms net view \shareaddress Blockquote System error 53 has occurred. The network path was not found. When I connected the network share I observed this error message: Blockquote \ "Mapped disk letter" refers to a location that is unavailable. It could be on a hard drive on this computer, or on a network. Check to make sure that the disk is properly inserted, or that you are connected to the Internet or your network, and then try again. If it still cannot be located, the information might have been moved to a different location The network share was mounted via Group Policy. Perchance anyone knows how I can avoid this error? When the OS has been restored from the disk problem has been solved

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• Running a VM off of an external HD via USB

  - by Nelson LaQuet

  Is it viable to run (i.e. reference the vmx/vhd directly from the mounted drive) a VM (vmware running Windows Seven) off of an external HD via USB? I mean, I know it's possible, but I guess I'm asking if USB provides enough bandwidth for normal usage... If so, are there any particular brands that may be better or worse? I know that ESATA would be a more viable setup, but my laptop doesn't have an ESATA port. Currently I use the VM to segregate all of my work development servers and software from my main machine; so I will be running all development servers and tools on the VM directly.

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• Music player for ubuntu similar to iTunes

  - by Allwar

  Hi, I really like Itunes as a music player but i can't get it to work in ubuntu so I need another one! functions i want: shuffle, low cpu usage, a friendly interface and free of bugs. (friendly interface = esay to use) why not use rythmbox, well it has bugs, the shuffle button doesn't work because it shuffles the next song after each song. So when i use it it's just a big loop over three different songs! i want the itunes look, like it shuffles once and lets you see in what order the songs will be played. //Alvar

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• Is there a RAR extractor (for multiple rar files like .r00 etc.) that will use all of my quad cores?

  - by Christopher Done

  I've got a quad core Intel processor. I've got a big file split into little ones as RAR files, foo.r00, foo.r01, etc. which the RAR program extracts into one file/directory. Is there a RAR program that I can specify like "use four cores" in the extract process? At the moment it sits there using 100% of one core. I recognise the bottleneck might be my hard drive anyway, but I don't see a lot of HD usage and suspect the decompression process is more intensive than waiting on I/O. For example, GNU Make accepts a (-j, I think) argument to tell it how many cores to use, which I used to compile PHP 6 really quickly.

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• Virtualbox crashes quite often in Windows 8

  - by user1776158

  I just installed Windows 8 on my computer. I got the ISO and the product key from my university so the software itself is sound. I use alot of virtual box. And ever since I moved to Windows 8, I have noticed that virtual box crashes more often. In particular, it is very very bad at opening multiple guests. My CPU usage will be at like 20% and I only have 3 guests open and my entire computer just freezes. Cursor and all. In Windows 7, I was able to open like 6 (not that I ever needed to) and really push my CPU. I havent experience any other issues with Windows 8 yet. Has anyone encountered this? Thanks!

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• why need select privileges on *.* to use view?

  - by profy

  I have a problem using view with MySQL server 5.0 (5.0.92) I cannot use view with a user granted like that : GRANT USAGE ON *.* TO 'testuser'@'' IDENTIFIED BY PASSWORD '**********'; GRANT ALL PRIVILEGES ON `testuser`.* TO 'testuser'@''; I can create view, but when I try to select in, I have this messages : ERROR 1356 (HY000): View 'testuser.v' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them I need to "GRANT SELECT ON . TO 'testuser'@''" to make select working on the view. Why ? Do you know a solution to use VIEW's without the select privileges on . ? Thanks a lots for your answers.

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• How to configure in crontab with condition statement for checks

  - by chz

  We like to monitor the NAS storage mounted on a linux box. We only like to be notified via mail when the usage exceeds a certain number say 80. We have only seen in linux books where most of them are calling shell scripts at certain times. How do we write inside crontab to only mail us if it exceeds 80 ? Usual eg 2 2 * * * /home/someUser/script.sh 2&1 | mail [email protected] Looking for solution like below 2 2 * * * if [ someNumber "80" ] ; then /home/someUser/script.sh | mail [email protected] Sincerely

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• When adding second processor to SQL Server, will it automatically balance the load?

  - by ddavis

  We have a SQL Server 2008 R2 (10.5) on a dedicated box with a single 2.4Ghz processor, which regularly runs at 70-80% CPU. We are going to be adding a significant number of users to the application and therefore want to add a second processor to the box (scale up). Will SQL Server automatically use the second processor to balance threads, or is there additional configuration that will need to be done? In other words, will adding the second processor drop my CPU usage to 35-40% per CPU, automatically balancing the load? Based on what I read here, it seems that it will: http://msdn.microsoft.com/en-us/library/ms181007.aspx However, I've read elsewhere that CPU performance gains can be made by assigning database tables to different filegroups, but I'm not sure we want to get that complicated at this point.

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• Uninstalling PowerShell 1.0

  - by Ddono25

  I am attempting to standardize our PowerShell deployment and usage across all servers, which involves uninstalling PS1.0/installing PS2.0 on Server 2003 machines. In searching for KB926139 through CMD and Control Panel Add/Remove Programs, it is nowhere to be found. We have KB926141 installed on these servers as the Language Pack update, but no initial Install Update. PowerShell 1.0 is installed on the server and can be found at the default locations (%windir%\System32\WindowsPowerShell\V1.0, %windir%\Syswow64\WindowsPowerShell\V1.0). I would like to avoid deleting the Registry Entry in this situation since it should be pretty simple, any help would be appreciated. Thanks!

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• Log with iptalbes which user is delivering email to port 25

  - by Maus

  Because we got blacklisted on CBL I set up the following firewall rules with iptables: #!/bin/bash iptables -A OUTPUT -d 127.0.0.1 -p tcp -m tcp --dport 25 -j ACCEPT iptables -A OUTPUT -p tcp -m tcp --dport 25 -m owner --gid-owner mail -j ACCEPT iptables -A OUTPUT -p tcp -m tcp --dport 25 -m owner --uid-owner root -j ACCEPT iptables -A OUTPUT -p tcp -m tcp --dport 25 -m owner --uid-owner Debian-exim -j ACCEPT iptables -A OUTPUT -p tcp -m limit --limit 15/minute -m tcp --dport 25 -j LOG --log-prefix "LOCAL_DROPPED_SPAM" iptables -A OUTPUT -p tcp -m tcp --dport 25 -j REJECT --reject-with icmp-port-unreachable I'm not able to connect to port 25 from localhost with another user than root or a mail group member - So it seems to work. Still some questions remain: How effective do you rate this rule-set to prevent spam coming from bad PHP-Scripts hosted on the server? Is there a way to block port 25 and 587 within the same statement? Is the usage of /usr/sbin/sendmail also limited or blocked by this rule-set? Is there a way to log the username of all other attempts which try to deliver stuff to port 25?

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• MySQL takes forever after running certain php scripts... optimization help?

  - by DFischer

  When I run a couple scripts from the vBulletin software (like uninstalling a plugin) it takes forever. When monitoring the memory usage, it shows this = -/+ buffers/cache: 158 381 Swap: 255 10 245 It seems that MySQL is only using a certain amount and once it does it tries to use the swap instead? I have a 512MB slice and right now my key buffer is at 16M and max_allowed_packet is at 16M. Is there something else I should increase or can I increase those variables and still be safe? Thanks.

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• Should a MobiTex service with a highly resilient website offer content over WAP?

  - by makerofthings7

  I'm trying to offer services over the MobiTex network (also see wiki) and want to reduce double-work. I'm trying to understand if it is a good idea to WAP enable my website. Given that WAP usage is increasing (since MMS is a hybrid of SMS + WAP), and the FCC has required every operator in the 700Mhz range to implement it I'd like to fully understand if there are benefits to the technology for certain critical applications. For example, if GPRS allows SMS traffic, voice, and Data, presumably they are handled by different Gateways. If there is another gateway for WAP traffic I would think that it would act as a backup if the data gateway was overloaded. Are there resiliency benefits to using WAP on a critical website? i.e. Content delivery (push or pull)

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• How can I tell if my live web-server is overloaded?

  - by Nick G

  We have a live webserver which doesn't seem to be performing all that well. It's a Dell PowerEdge machine, a few years old (dual core, 4GB) which is hosting about 20 low-traffic websites. However it doesn't seem to be as fast as it used to be. How can we determine the cause of this? If it's website traffic, I would be expecting high CPU but CPU usage is quite low and hovers around the 15-30% mark except for very brief periods. I'm wondering perhaps, if rather than CPU performance being a problem, perhaps it's disk thrashing due to the constant read/writes of all the small web files and database queries. It has 4x 7200 RPM SATA drives in RAID 5. So is there a way to check that it's not disk thrashing?

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• SIP Service to record all calls?

  - by TK Kocheran

  I read an article that I can't find at the moment which detailed a way to have Google Voice point to a SIP phone number which forwards to your phone in order to take advantage of the SIP service in order to Have all calls use a data connection = no usage of cell-phone plan minutes. Record each and every conversation.* I really want to be able to accomplish this, primarily issue number 2, as all of the phone recorder tools in the Android Market essentially don't work for my Nexus One. I figure that I have one of two options with this. I could 1) use an existing (hopefully free) service which will do this for me or 2) I could set up a SIP service at my home. to somehow forward calls through my home server which will record the calls as well as forward calls to my cell phone. Obviously, the path of least resistance is the one I'd like to go down. Can anyone help me out with this? * I do understand that the legality of this varies from state to state here in the US.

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• How to identify who is using Hardware Reserved Memory in Windows 7

  - by blasteralfred

  I run Windows 7 x86 Home Premium. I have an installed physical memory of 4 GB, out of which, 2.96 GB is usable (My Computer Properties). I checked the memory usage using Resource Monitor and found 3036 MB / 4096 MB is available. I noticed that 1060 MB is unavailable since it is reserved by some "Hardware component(s)". I would like to know which hardware component is using this 1060 MB. Is there any way or tool to identify this? Note: I know that Windows 7 Home Premium x86 supports a maximum of 4GB RAM.

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• IIS not using available memory?

  - by Herb Caudill

  Recently launched an ASP.NET site running on a single 32-bit WS2003 box (SQL on a separate server). The server has 4GB intalled, 3GB available. According to task manager, the w3wp.exe process is only using between 200-600MB. The site has tens of thousands of pages and makes heavy use of page output caching, so I would expect it to use a lot more of the available memory. The app pool isn't set to throttle memory usage. Is there anything else that might be limiting the amount of memory that IIS takes?

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• What Logs / Process Stats to monitor on a Ubuntu FTP server?

  - by Adam Salkin

  I am administering a server with Ubuntu Server which is running pureFTP. So far all is well, but I would like to know what I should be monitoring so that I can spot any potential stability and security issues. I'm not looking for sophisticated software, more an idea of what logs and process statistics are most useful for checking on the health of the system. I'm thinking that I can look at various parameters output from the "ps" command and compare to see if I have things like memory leaks. But I would like to know what experienced admins do. Also, how do I do a disk check so that when I reboot, I don't get a message saying something like "disk not checked for x days, forcing check" which delays the reboot? I assume there is command that I can run as a cron job late at night. How often should it be run? What things should I be looking at to spot intrusion attempts? The only shell access is SSH on a non-standard port through UFW firewall, and I regularly do a grep on auth.log for "Fail" or "Invalid". Is there anything else I should look at? I was logging the firewall (UFW) but I have very few open ports (FTP and SSH on a non standard port) so looking at lists of IP's that have been blocked did not seem useful. Many thanks

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• Lightest way to run Google Hangouts Chrome app on Mac

  - by jadengore

  I recently transitioned to Safari because I'm really tired of how Chrome hogs memory and drains my battery like crazy. The only thing that has been keeping the Chrome icon open is the Hangouts plugin. Basically, I am looking for the lightest way to run Hangouts on my Mac. By light, I mean the least amount of RAM usage, and preferably a way to do it without Chrome open/light version of Chrome that only opens extensions. Any suggestions? EDIT: Another thing I noticed was that Hangouts ignores your default browser if links are sent to you by chat, and when clicked they open in Chrome. My question doesn't relate to this at all, but I found it interesting...

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• How to partition a 1 TB drive for performance on a windows development machine?

  - by dip

  I saw a similar question for linux, but nothing for windows. I'm getting a new 1TB drive for my dev box @ work. The OS will be Windows 7 Pro with 8GB of RAM and just the single 1TB drive. Backups are not a concern, and I won't be storing large multimedia files. I want the fastest possible performance for general windows usage and for compilation. I will defrag nightly with a smart defragger liker perfectdisk. Should I just go with a single partition, or is there some way I can lay things out for the best performance?

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