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• Prevent Windows 7 from unpluging External HDD

  - by marverix

  I have installed Windows 7 as my media server. I pluged in 500GB external HDD via USB. I have changed power plan to Best Performance and changed advenced power settings to never turn off HDD etc. I even yesterday wrote powershell script (create and delete folder on this disk) and I have added it to harmonogram to run every 5 minutes starting from system boot. And nothing! Disk after some time (I realy can't say when) is turning off and Windows show "Unknown Device" in Device Manager. Then only system reboot or disk reboot helps. Any ideas how to prevent Windows 7 from stopping my external HDD? Cheers!

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• concrete uses of LDAP?

  - by ajsie

  im new to LDAP. i wonder what are some concrete examples of using LDAP. things that are MUCH more easier to do when you got 3-7 linux computers in a small company network. one use that is very important for me seems to be that you configure LDAP to handle system authentication. then you dont have to create same accounts in all computers. are there other things that are a MUST DO for a small network to save more time? my small network is for apache servers and database servers. and should LDAP be in an own machine? cause i guess its not good to put it in apache or database servers since these are performance dependent.

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• What happens when you add a Graphics card to a i7 with build in graphics (e.g. HD 4000)

  - by Matt

  I'm thinking of upgrading my computer from an AMD Phenom II X4 955BE with a AMD Radeon HD 6800 Graphics card (not integrated) to using a Intel Core i7 3770. As I have no knowledge of integrated graphics, my question is, what happens to the computing power when not using the HD4000 integrated graphics of the CPU (does it mean the CPU will run faster then it would if I relied on it?) Also what is better the CPUs inbuilt HD4000 or my Radeon Graphics card? I am mostly interested in terms of content creation: Using Adobe After Effects, 3D Rendering etc. Not too bothered about gaming performance. I will be using the spare parts of this build and older systems to make a second computer for network renders so what will be the advantages of keeping the Radeon with the current system for that?

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• How to increase Remote Desktop resolution?

  - by BugAlert

  I'm using Windows 7 on a PC and connect to it via Remote Desktop Connection for Mac by MS, using a Mac. On the Mac, I have a 27" Display with 2560 x 1440 px resolution. The PC has a high performance graphics card (one of those that needs an additional power supply). Both machines are connected via network cable to a router. So network should be insanely fast. However, the max resolution I can get is 1400 x 1050. The PC just has a old and bad 21" monitor connected to it. How can I increase the resolution to 2560 x 1440 to work fullscreen with the Apple LED Cinema Display via Remote Desktop? Maybe I shouldn't even ask, because I already experience some lag at the low resolution of 1400 x 1050. But I guess this can be resolved as well?

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• Best practice for scaling a single application source to multiple nodes

  - by Andrew Waters

  I have an application which needs to scale horizontally to cover web and service nodes (at the moment they're all on one) but interact with the same set of databases and source files (both application code and custom assets). Database is no problem, it's handled already with replication in MongoDB. Also, the configuration of the servers are the same (100% linux). This question is literally about sharing a filesystem between machines so that its content is always correct, regardless of the node accessing it. My two thoughts have so far been NFS and SAN - SAN being prohibitively expensive and NFS seeing some performance issues on the second node with regards to glob()ing in PHP. Does anyone have recommended strategies or other techniques that don't involved sharding data across nodes or any potential gotchas in NFS that may cause slow disk seek times? To give you an idea of the scale, the main node initialises it's application modules in ~ 0.01 seconds. The secondary is taking ~2.2 seconds. They're VM's inside a local virtual network in ESXi and ping time between them is ~0.3ms

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• Nexenta under KVM?

  - by Nick

  I have an Ubuntu Server running KVM. I'd like to get the benefits of ZFS so I was thinking of installing a virtual machine under KVM running Nexenta (or NexentaStor), allowing that virtual machine to have raw access to a couple of physical hard disks, and then having it share its file system with NFS so that Ubuntu can access it. I've never tried setting up KVM so that the virtual machine has access to physical drives. Does this sound feasible, and is there anything I need to watch out for? Has someone already documented something like this? Does Nexenta/ZFS function basically as well in the virtual environment as if they were running base bones? I can take a small performance hit, but I don't want it to not be as reliable because of the virtualization. Thanks.

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• What can I do to enhance MacBook Pro internal mic sound quality in iMovie?

  - by gaearon

  After using MacBook for two years, I bought 17'' MacBook Pro. I'm pretty happy with it, performance and all, but I also was going to record some music videos for YouTube. I play guitar and sing. However I was extremely disappointed with the sound quality that comes by default. I'm 100% sure my 13'' MacBook mic was much better at recording music and singing. Currently mic can't event handle acoustic guitar, outputting sound you'd think was recorded 5 years ago in ARM format on a Nokia phone on a loud concert. It totally feels like some lame filter is cutting low and high frequencies. I want to know what settings (visible or hidden) in iMovie or Mac OS itself I might want to tweak in order to get my MBP mic record clean sound.

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• How do I log file system read/writes by filename in Linux?

  - by Casey

  I'm looking for a simple method that will log file system operations. It should display the name of the file being accessed or modified. I'm familiar with powertop, and it appears this works to an extent, in so much that it show the user files that were written to. Is there any other utilities that support this feature. Some of my findings: powertop: best for write access logging, but more focused on CPU activity iotop: shows real time disk access by process, but not file name lsof: shows the open files per process, but not real time file access iostat: shows the real time I/O performance of disk/arrays but does not indicate file or process

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• Advice for migrating email server

  - by Chris Adams

  Hi there, I'm planning to migrate a Zimbra server with about 200gb of data from a server hosted in an office into a datacentre, to increase uptime (we've had a couple of outages when our network here started flaking out, and we have people in other countries relying on this server too). However, I'm not sure how best to migrate the data into the data centre without rendering the connection unusable during office hours, because there's far too much to send in over night over the two meg upstream connection we have here. I'm familiar with using tools like nice to stop a long running process degrading machine performance - is there a simple way to throttle a connection between office hours, so the long running transfer doesn't block the pipe, but then opens up outside of office hours to make the most of the bandwidth? I'm aware the alternative here is to simply mail a hard drive to the data centre, but I'd like to avoid doing that if I could. We're using Centos Linux for our servers, in the office and the datacentre, so extra points for an open source linux answer.

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• Upgrading from MySQL Server to MariaDB

  - by Korrupzion

  I've heard that MariaDB has better performance than MySQL-Server. I'm running software that makes an intensive use of MySQL, thats why I want to try upgrading to MariaDB. Please tell me your experiences doing this conversion, and instructions or tips. Also, which files I should take care of for making a backup of MySQL-Server, so if something goes wrong with MariaDB, I could rollback to MySQL without issues? I would use this but i'm not sure if it's enough to get a full backup of MySQL-Server confs and databases mysqldump --all-databases backup /etc/mysql My Environment: uname -a (Debian Lenny) Linux charizard 2.6.26-2-amd64 #1 SMP Thu Sep 16 15:56:38 UTC 2010 x86_64 GNU/Linux MySQL Server Version: Server version 5.0.51a-24+lenny4 MySQL Client: 5.0.51a Statistics: Threads: 25 Questions: 14690861 Slow queries: 9 Opens: 21428 Flush tables: 1 Open tables: 128 Queries per second avg: 162.666 Uptime: 1 day 1 hour 5 min 13 sec Thanks! PS: Rate my english :D

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• AWS: Should my EC2 and RDS instances be in the same Availability Zone?

  - by DOOManiac

  I just noticed that all of our EC2 instances are in zone us-west-2b, but our Multi-AZ RDS instance is in us-west-2a. Performance-wise everything seems to be okay, and it will be a hassle to "move" the instances to one place since you have to stop and re-create them all. However if either of the two zones goes down when we will have some downtime; if everything is in one zone then at least we have a higher chance of not being in the zone that has downtime... Is this something worth fixing, or am I over-thinking it? (I was about to purchase some EC2 Reserved Instances, which are tied to specific AZs, so I wanted to make sure before going through with it) Thanks!

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• How do ulimit -n and /proc/sys/fs/file-max differ?

  - by bantic

  I notice that on a new CentOS image that I just booted up off of EC2 that the ulimit default is 1024 open files, but /proc/sys/fs/file-max is set at 761,408 and I'm wondering how these two limits work together. I'm guessing that ulimit -n is a per-user limit of number of file descriptors while /proc/sys/fs/file-max is system-wide? If that's the case, say I've logged in twice as the same user -- does each logged-in user have a 1024 limit on number of open files, or is it a limit of 1024 combined open files between each of those logged-in users? And is there much performance impact to setting your max file descriptors to a very high number, if your system isn't ever opening very many files?

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• How do ISPs/Colocation Facilities limit bandwidth for Ethernet Drops?

  - by Kyle Brandt

  I have switch providers and have run into some problems with bandwidth limitations. I have more bandwidth then before, but there are performance issues. The router is connected to a 100mBit port, but they limit it to arbitrary settings (in software I imagine). It seems when I go above the limit, the provider starts to drop packets beyond the limit (This is what they said they do as well). Is it possible the previous provider did something like queuing packets above the this limit before dropping them? Is anyone aware of not only what can be done, but what is typical? Also, is there anything I can do on my Cisco router to help this situation? It would seem I am pretty helpless if the packets are dropped before they reach my interface (The traffic that is high is inbound to my network).

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• Scalable WordPress Host for High-Volume Site?

  - by Jonathan Eunice

  I need recommendations for a scalable web host for a high volume WordPress web site. For my purposes, high-volume might be 100K-500K visitors/hour. Might think towards a 1M/hour burst rate as a "high water mark." I know WP isn't the highest-performing platform out there (ha!), but it's non-negotiable. I can do "the usual optimizations" (e.g. put static files in a CDN, run and follow the advice of performance analyzers like YSlow, etc). But it will still be WordPress, and there will be a dozen or so plugins involved. So, where to host the site? Most "what's the best WordPress host?" discussions seem to focus on lowest-cost. I need the opposite. What are the high-volume, scalable, or clustered WordPress hosts with which you've had great experiences?

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• General High-Level Assessment

  - by tcarper

  Guys and Gals, I've been tasked with a doozy of an assignment. The objective is something akin to "laying of hands" on several database servers which work in concert to provide data to various Web, Client-Server and Tablet-Sync'd distributed Client-Server programs. More specifically, I've been asked to come up with a "Maintenance Plan" which includes recommendations for future work to improve these machines' performance/reliability/security/etc. Might there be some good articles on teh interwebs ya'll could point me towards which would give me some good basis to start? Articles describing "These are the top 4 overarching categories and this is how you should proceed when drilling down on each of them" sort-of-thing would be fabulous. The Databases are all SQL 2005, however the compatibility level is 80 and they were originally created with ERwin based on SQL 6.5. The OSs are all Windows Server 2003. Thanks all! Tim

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• replace controller, add second controller, or use expander?

  - by longneck

  I have a Proliant DL380 G6 that I am re-purposing as a Hyper-V host for a new, off-site data center that will host our DR services. The server currently has a P410i controller with the 512MB BBWC module. The drives installed are SFF 6G 10K drives. I plan to add the HP 516914-B21 drive cage, which gives me 8 more SFF drives, bringing the total to 16. To get the additional 8 drives connected, I have one of three choices: Install a new controller that can support 16 drives. Install a second controller. Install a SAS expander, such as the HP 468406-B21 recommended by HP's spec sheet for my server. My question is: how do I know if I'm going hit a performance ceiling by putting 16 drives on the P410i or using the expander? And if I am, how do I select an appropriate controller? I'm not sure what specifications I should be looking at.

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• How do I lower idle cpu usage in ubuntu linux? Gnome or KDE Variants

  - by Jasen

  My question comes from a kde desktop currently, but it also happens with the gnome instance. When just sitting there, with only the cpu monitor widget running. no open windows, no background processes other than the desktop, my cpu is at ~20%. I wanna know how to fix this, and possibly get better performance out of it. When running my windows side, the cpu will sit at zero, and i generally load new programs about 400ms faster. With windows 7 being as slow as it is, this is not acceptable. and the widget is only set to check every 500ms, so im almost completely sure its not the widget. My system is a Gateway nv 53 amd 2.0 ghz turion with 4 gb of installed ram, and 500 gb hd. both linux and windows are 64 bit. average ram use on either system is about 1.4 gb for just the os

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• cygwin rsync over ssh very slow

  - by Waleed Hamra

  I have 2 machines running Windows Xp SP3. I have cygwin installed on both, version 1.7. I have rsync and ssh installed on both, and configured using default settings as per ssh-host-config and ssh-user-config programs provided. I moved the public keys into their respective locations, and basically ssh is working fine. i began an rsync operation, using: rsync -av --delete --hard-links local_dir username@other_machine:/some_dir well... on both machines, the processor is running near idle, no heavy usage. I checked IO using process explorer on both machines, and that too is at normal levels (1~2 MB/s), so I can't see where the bottlenecks are, because network performance is aweful. I'm not going over 1MB/s... when a normal file copy using windows sharing achieves some ~10 MB/s.. What could be wrong?

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• How to check if redis master is OK?

  - by e-satis

  On the documentation, they advice the monitor command. But it has a 50% performance penalty for the whole system, and how should I do that ? Whatching the ouput using SSH until I don't see anything ? Let's say I have 3 servers: 1 with a redis master, 1 with a redis slave, and one with my website querying the redis master. How can I, from my website server, make cleany the decision to fallback to the slave by sending the SLAVEOF NO ONE command ? My first step would be to put some kind of timeout check with a simple ping, just to be sure the server is online. But for redis specifically, I have no clue.

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• What kind of CPU/GPU integration is offered by APUs?

  - by clabacchio

  I'm truly fascinated by the idea of GPGPU and using the GPU for heavy processing. I'm seeing that also APUs (Accelerated Processing Units, CPU+GPU on the same chip) are gaining a consistent popularity. Are all of the APUs using a GPGPU? Can it be used for processing? And is it seamless or it requires special code (like Cuda) to have the hard work made by the GPU? I'm not interested in bare graphic performance, but more about how much the GPU can accelerate the "normal" CPU work.

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• Resilient Linux Mail Server Setup

  - by Coops

  How would people design a resilient mail server setup with Linux? On an application level what the system needs to provide is both an incoming and outgoing mail service (i.e. SMTP & IMAP), along with filtering and archive storage (the archive part isn't critical yet, so we'll look at this later probably). What is required on top of this is a resilient system, i.e. one which will handle individual server failures without interrupting service. As such I would term this a High Availability mail system. This is in contrast to a High Performance mail setup, as in our case the volume of mail being handled isn't the important factor, it's simply that it stays online. Having not approached this problem before, the first thing I thought of was a clustered file system (gfs/gluster/etc), combined with heartbeat to failover a floating IP to another box in the case of a server failure. Combined with postfix & dovecot does this sound feasible to people?

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• information about /proc/pid/sched

  - by redeye

  Not sure this is the right place for this question, but here goes: I'm trying to make some sense of the /proc/pid/sched and /proc/pid/task/tid/sched files for a highly threaded server process, however I was not able to find a good explanation of how to interpret this file ( just a few bits here: http://knol.google.com/k/linux-performance-tuning-and-measurement# ) . I assume this entry in procfs is related to newer versions of the kernel that run with the CFS scheduler? CentOS distro running on a 2.6.24.7-149.el5rt kernel version with preempt rt patch. Any thoughts?

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• How to check if a server runs in pressing mode

  - by Ice

  Hi there, Layout: i have at customer side a server (win2003 R2 SP2 standard edition 32-bit) with a sql-server 2005 and some databases. This system starts with the /3GB-Switch. The system reports 3.25 GB RAM and taskmanager reports the process of sqlserver.exe with 2758255 K as the process with the highest consumption. The OS separates RAM for applications and for itself, normaly 50:50. But here we have the /3GB-Switch aktivated and i think the part for the applications is more than 50% of RAM. Knowledge (or better not knowledge): Somebody told me that if the OS runs out of memory within his part of RAM, the server runs into pressing mode. Questions: What is this pressing mode? Is pressing mode possible at all in this szenario? What should be done to get more performance out of this sql-server, beside optimizing the database and all this stuff.

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• Intel hybrid graphics stuck in power save mode

  - by OZZIE

  I have an Asus UL30V with Intel hybrid graphics. When I bought it it used to switch to turn of the better graphics card to save power and run on a more power effecient one. When I connected the laptop to a power source again I could go to the intel graphics icon on the task bar and click on "switch to enhanced performance mode" or something similar. But like 2-3 months ago it suddenly vanished. I cannot switch modes anymore, it's gotten stuck in power save mode. I can change the windows power setting but that doesn't enable the better graphics card :( What should I do? I've tried restarting the computer and that does not work. I really hope I don't have to reinstall the drivers! It seems like other people have had the same issue: http://en.community.dell.com/support-forums/laptop/f/3518/p/19422695/19994601.aspx , he hasn't even got the same computer as me. I have windows 7 Home Premium x64 Any ideas?

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• A space-efficient guest filesystem for grow-as-needed virtual disks ?

  - by Steve Schnepp

  A common practice is to use non-preallocated virtual disks. Since they only grow as needed, it makes them perfect for fast backup, overallocation and creation speed. Since file systems are usually based on physical disks they have the tendency to use the whole area available1 in order to increase the speed2 or reliability3. I'm searching a filesystem that does the exact opposite : try to touch the minimum blocks need by an aggressive block reuse. I would happily trade some performance for space usage. There is already a similar question, but it is rather general. I have very specific goal : space-efficiency. 1. Like page caching uses all the free physical memory 2. Canonical example : online defragmentation 3. Canonical example : snapshotting

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