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• Monitor Processes' Memory Usage

  - by Alvin Sim

  We have an IBM P series box running AIX 5.3. This is our application server, whereby our J2EE application is running in Oracle's Applications Server (version 10g r2). At around 11pm till the next day 7am, we have shell scripts running, which executes Java class programs. Recently, this server has been experiencing some high memory usage, which caused some of the Java class programs throwing "Out of memory" exception . We normally use NMON to monitor the server's resources, such as CPU, I/O, memory, etc. But because of this OOM issue, we would like to know throughout the day, what are the processes which are running and how much memory each process consumed. NMON is not able to show this. Even with the "-T" parameter, it only shows the top processes and not all. Is there any thing we can use to monitor all the processes' memory?

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• My HP-Vista based laptop has become very slow recently

  - by goldenmean

  My HP laptop which has Vista Home premium. When I try to start Firefox, internet explorer, it becomes very slow. No other app. When i checked the Performance in Task Manager. It shows the Physical memory , Free as 0 bytes, almost always. This has been recently. Earlier it didn't used to be zero. Laptop has 2GB of RAM. I have nothing running in my tray except - Sound control, Laptop power plan indicator,Network status indicator. There are no other processes whose memory usage adds up to so high to make Free memory as 0. Then what could be hogging the memory and make the laptop very slow. Any pointers would help as it is crawling at the moment.

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• System Monitoring Redundancy

  - by Josh Brower

  I consult in a small business environment where I have two HyperV hosts (with <10 VMs) + a couple other servers. I recently had an issue where one of the HyperV hosts had a CPU issue and it came down, bringing most of my non-critical VMs with it, plus a free piece of software that I use for network & system monitoring and availability. Because of this, and the fact that iDRAC locked up to, I did not get any alerts about the crash. So I am wondering how I can (cheaply) get a redundant availability monitoring system in place--Is is as simple as running Nagios or Zenoss (or whatever) on two different HyperV hosts? It just seems like running more than one copy of Nagios/Zenoss/etc could be expensive and have high overhead. Thoughts? Thanks! -Josh

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• What contributes to smooth online video streaming?

  - by Wesley

  I had a general question about streaming videos online; in particular, on YouTube. What really is required to smoothly stream videos at 360p or 480p? Then for that HD goodness, what really allows a computer to smoothly stream 720p and 1080p? I'm not too sure whether it's to do with the CPU (speed, # cores, cache size), GPU (chipset, VRAM, memory type) or even HDD (IDE vs SATA). What contributes to the ability to stream regular videos and, furthermore, high-definition videos online?

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• Can a Linksys Router be the cause of bad speeds on a 1.5 mbps link.

  - by gramware

  We use a Linksys 5-port router at a smal organization with about 20 employees. We recently acquired a 1.5 mbps fibre link, but sometimes the link goes down and speeds are still low. On enquirey from the ISP, this was part of the response, However there maybe throttling due to the router in place. A Linksys is a low end router and may be unable to carried traffic of up to 1536Kbps. We are in a position to deploy a Cisco 871 router on test for 2 wks to eliminate that possibility. Also kindly advise the destination of the ping results they look to high. How true is that about the router throttling the network and need for a bigger one.

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• MD3200i Slow Performance and Queue Depth

  - by Caleb_S

  Read performance on our SAN is slow under certain workloads. When we compare this to some local storage, we find the local storage performing 2x as fast. The SAN performs well with a high Queue Depth, and poorly with a low queue depth. However, the local storage performs well with a low Queue Depth. I'd like to know the reason for this occurring and find out what the specific limiting factor is in this situation. MD3200i iSCSI SAN ($15,000) 6 x 600GB 15k SAS RAID5 6 x 2TB 7.2k NLS RAID5 XCOPY /j Benchmark: (Slow) 15k Array - 71MB/s (Queue Depth 1) 7.2k Array- 71MB/s (Queue Depth 1) Robycopy /MT:32 Benchmark: (Fast) 15k Array - 171MB/s (Queue Depth ~12) 7.2k Array- 128MB/s (Queue Depth ~12) , , Read Performance on a Local controller is fast under the workload the SAN is slow at. , HighPoint 2230 RAID Controller ($600) 4 x 1TB 7.2k SATA RAID5 XCOPY /j Benchmark: 7.2k Array - 145MB/s (Queue Depth 1) (appears to max out the SATA bus)

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• How to automatically resume php-fpm?

  - by alfish

  I am using nginx+php-fpm on Debian Squeeze for a busy server and have had great difficulty to deal with maximum connections being reached. Here the problem is that php processes sometimes just die randomly under high load and leave the server with no php process. Then I need to manually restart php5-fpm service to bring back the server to life. I am wondering how to avoid this to happen, or at least treat the symptoms by restarting the php5-fpm automatically whenever there is not php process left to listen to incoming requests. My relevant configs are: pm = dynamic pm.max_children = 1400 pm.start_servers = 10 pm.max_spare_servers = 20 pm.process_idle_timeout = 1s; #not sure it will be useful when pm=dynamic pm.max_requests = 100000 request_terminate_timeout = 30 I appreciate your suggestions to cope with this nasty problem.

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• HPC Cluster planning workflow?

  - by Veronica

  After three days of intensive Google searching, I have not found any high-level workflow of how to build a low profile - cheap - computing cluster (we are not interested in HA yet). This is just a front-end plus a node for now. We want to start small with rockscluster, provide a web-based server for offering services, and then add nodes as our budget increases. We're small company, so we haven't enough human resources to implement it smoothly. Here are some facts about our environment: Our hardware is not constant (we will add nodes). Our workload will vary (in the order from 200Mb - 1Tb) Our software will change (scientific applications for data mining) Do you know any visual workflow, worksheet, chart, describing the general necessary steps to begin our cluster planning?

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• To decide where to crop an image, how can I highlight it's most compressible areas?

  - by Umber Ferrule

  I'm looking to get the most compression out of each of the most popular image formats, such as, JPEG, PNG, GIF, etc. Ideally, this would be a tool, or a series of transforms that could be performed (perhaps using a macro and then discarded) in popular image editors (Paint.NET/PaintShopPro/PhotoShop/GIMP) to highlight areas which will compress less. Alternatively, what rules of thumb can be used other than reducing colours (for PNG/GIF), reducing image dimensions, avoiding high detail areas... I'm not asking for help deciding what format to use for a particular image type as I think this is fairly common knowledge, i.e. diagram and images with few colours = PNG/GIF, photographs = JPEG.

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• OLTP Sql Server RAID configuration with 10 disks, allocation Unit and disk stripe size

  - by Chris Wood

  On a new db server I only have 10 disks to play with, The usage is about a booking every 3-5 seconds, so not high volume, I know compromises have to be made, but my initial thoughts are - DISK 1 & 2 - RAID 1 - OS DISKS 3,4,5,6 - RAID 10 - Data, Indexes & TempDB DISKS 7,8,9,10 - RAID 10 - Logs & Backup Full backups will take place when there is virtually no traffic on the website so not bothered about the contention with the logs. disk 3-10 - 8kb NTFS unit allocation size disk 3-10 - 64kb Disk Stripe size does this seems to be sensible, any other considerations I have omitted ? thanks

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• Severe latency only on one machine and only when accessing intranet site

  - by Joe M.

  I have one desktop machine that is having consistently high latency only when trying to load a page from an intranet site. Using the Chrome Developer Tools, the site shows a "Waiting" time of 4-5 seconds each page load. Other machines have <50ms, and the problem machine loads regular internet sites with <1s latency, so the problem is only on one machine and only when accessing the intranet site. This is a small business and all the hosts are on 192.168.0.1/24 I would have suspected a connection issue with the problem machine but normal internet sites are not having latency. Then I would have looked at connection issues with the intranet web server but other machines are not having latency to it. What else can I look at to troubleshoot this?

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• 27 days after domain transfer name servers not propogated

  - by Thom Seddon

  We recently bought the domain: embarrassingnightclubphotos.com 7 days after accepting the transfer the domain finally transferred to our registrar and we immediately changed the name servers from ns*.netregistry.net to amy.ns.cloudflare.com and cody.ns.cloudflare.com 20 days after changing the name servers, the majority of tests show that both old and new nameservers are still being reported: http://intodns.com/embarrassingnightclubphotos.com http://www.whatsmydns.net/#NS/embarrassingnightclubphotos.com We are now ready to launch the new site but this issue is plagueing us as a high proportion of the traffic is still receiving the old nameserves and so hitting the old server. You can tell if you have hit the old or new server as the old server has the value "A" for the meta tag "Location" and the new server has "U". (The old server just has an iframe too!) I have never had this problem before - who is causing this and how should we go about reaching a resolution? Thanks

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• Way to auto resize photos before uploaded to cloud service?

  - by AndroidHustle

  I love using auto syncing services to have my photos taken with my smartphone stored on a cloud storage service. One problem though is that the photos are uploaded in high resolution and takes up a lot of space on the drive. I wonder if any one knows of a service/strategy to have the auto uploaded photo resized to have it occupy less space when auto stored? That is, without me having to take the photos with lesser quality, I still want photos taken with the highest quality since I may take a photo I really like.

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• Mysql Master-ColdMaster

  - by enedebe

  I explain my case: I'm at Amazon AWS and I want to be fault tolerant on a entire region failure. My basic problem is to have the db in sync with 2 regions. My options: Master-Master (high lag) Hand made sync every 5 minutes Master-ColdMaster?! (copy on the fly but Master won't wait the other region commit) In my system we could afford loosing a piece of data (we're not a bank) the last inserts in the db, but we could not afford more than 10 minutes of downtime. The database is small and the level of inserts is low, and I wouldn't affect the normal usage waiting other region commit. Is the 3 solution posible? And the most important, once the primary fail how we can detect and change the rol between master-coldmaster -- coldmaster-master ? Is there any clean-mode to restore between failure? Thank's!

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• Can a switch consume bandwidth?

  - by aashiq

  I have a network with a router and a switch. At first my ISP's optical fiber is connected with media converter input port. Than Ethernet cable (output port of Media converter) is connected with the switch. Then an output Ethernet cable is connected with our inner Microtik router. Then this router is connected with another LAN switch. From this switch we have got every connection other switch. It is our total network structure. Our bandwidth is 2 Mbps. From the 11th of March our MRTG graph shows high all the time even when my all switch is switched off except LAN switch. That's why our line is breaking up (Voice call). How could be it possible? My all PC's bandwidth is limited but when connected PC with media converter directly then the graph shows normal. That's why I can't blame my ISP.

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• Tools to automate recording streaming radio

  - by Stan

  Are there any tools that can automate recording online streaming radio? I've been using Total Recorder which has the following useful features: Handy scheduler Supports creating recording templates, so I can customize some high/low quality recording Unfortunately it requires opening the streaming radio in a browser and can't have another sound source at the same time; it's recording what comes out from the speaker. What I am looking for is given an online radio URL, the tool should be able to record the audio stream, no matter if I am playing any other music or not. Does such a tool exist?

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• Dell 620 display is too bright to use

  - by keith

  I have a Dell D620 with a display problem. In windows 7 the display seems to be too bright, the text is broken up, the only way to see the mouse is at a very oblique angle. Changing the brightness with fn and brightness control has little/no effect. When I put it in high contrast mode I can see all the colors, but any windows pictures etc are still useless. I cannot get it to connect to an external monitor via VGA port or via a USB-VGA connector.

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• Why do my download speeds drastically vary during a download?

  - by J. Anthony Carter

  I watch the download speed rise and fall like waves in a storm. At night, during low bandwidth usage I have achieve speeds as high as 3.23 M/sec but the watch them decline to 250 K/sec. and then climb back up. Over and over. During the day my best is around 1.67 M/sec with lows into the 65 K/sec. On top of this, why does a download need to slow down when approaching the end of the download? It's not like a multi-hundred ton train needing to decrease speed as it approaches the station.

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• Suggestions for a SOHO/Home Asterisk system

  - by James

  I would like to buy a small embedded system that runs Linux and Asterisk. I would like two FXS ports ( to plug analogue phones into ) and one FXO port ( to plug in to my real line to allow access to the POTS ). I would like it to have a USB port to hold storage for voicemail. I really want it for home use so I would like it to be under £150 ( say $250 ), given that you can buy ADSL routers for around this much can any of them be made to run Linux and Asterisk? I don't want a PC as the power usage would be too high. I am looking for something like this ASDL router but open and able to run Asterisk or another open PBX. At worst I would like a box which had one FXO and two FXS and just made them completely available over IP to a full Asterisk system on a low power Atom system.

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• Selectively allow NetBIOS inbound traffic

  - by shayan

  This is what I try to achieve from a very high point of view: Every time someone tries to access my shared folders (on Windows) a popup should open and ask for my permission. Do you know any tool? Something like "NetShareMonitor" is helpful for monitoring only A tool like an Antivirus these days has a focus on outgoing traffic A normal firewall does not allow me to select at the time of request. Setting User Permissions is not an option, I want to allow/deny at the time of request even if it is the same user over and over again.

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• How to force my laptop to use the discrete GPU?

  - by Anton Roth

  My laptop (Asus X7BSV) is stuck using only the integrated GPU. It has a nVidia GT540M as well, but I cannot get it to work. I am using a Windows 7 x64 with latest drivers. This occurred after I attached an external USB monitor I need for work, and since then I cannot swap back to the nVidia GPU (dxdiag for example says that the primary GPU is the Intel integrated one). Asus support asked me to completely reinstall the system, but that is something I do not want to do. I checked the BIOS, there is no option as to what GPU to use. The nVidia card itself is working, since I can use CUDA on it, and it worked with a Ubuntu Live CD. In the nVidia software management I tried setting it to global setting, high performance GPU (nVidia), but that had no impact. What am I missing here? I did uninstall/delete all drivers and software related to the external monitor, but that did not help.

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• Deprioritize BitTorrent traffic

  - by Steven Xu

  I'm sure the question has been asked before, but I can't seem to find it for myself; my Google-fu eludes me. My router, the Linksys E2000, does a decent job at being reasonable about prioritizing some sorts of traffic above BitTorrent traffic (there isn't too much interruption to port 80, 443, or 22 traffic, the ones I use most often). But other ports get pummeled. For instance, 3000 (which I use for local Rails testing) becomes almost entirely non-functioning. Xbox Live traffic (not sure about the ports, but they are in the 1000 range) doesn't do well either. So I'm wondering how to ensure that XBL and local Rails testing maintain strong service while BitTorrent is going. Is it enough that I turn up the QoS on their associated ports to high? It doesn't seem to be as effective as when BitTorrent isn't running at all (I don't know if there's a way to deprioritize BitTorrent traffic).

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• Clear / Flush cached memory

  - by TheDave

  I have a small VPS with 6GB RAM hosting a couple of websites. Recently I have noticed that my cached memory size is quite high - see below: Cpu(s): 0.1%us, 0.1%sy, 0.0%ni, 99.1%id, 0.0%wa, 0.2%hi, 0.4%si, 0.0%st Mem: 6113256k total, 5949620k used, 163636k free, 398584k buffers Swap: 1048564k total, 104k used, 1048460k free, 3586468k cached After investigating if there is some method to have this flushed or cleared I stumbled upon a command which is: sync; echo 3 > /proc/sys/vm/drop_caches I read it could be useful to add this to a chron-task/job. Is this method recommended or could this lead to potential problems? The only concern I have is that I use one Magento installation on Memcached - could this have any negative effects on it? I am certainly not a pro therefore I would very much appreciate some expert advise. PS: My VPS runs on CentOS 5 x64 and I have WHM + NGINX installed.

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• Waht are the best proxy servers for Mikrotik router?

  - by niren

  I want to setup proxy server for my Mikrotik router. There is inbuilt web-proxy for Mikrotik router but I can extend this upto transparent proxy(kind of proxy server) only. We need High anonymity proxy so that we can hide our LAN static IPs(we don't have private IP) from outside Intruder/hackers. And also I know I can setup NAT rule to hide our IP(only private IP not public/static IP) as per this link, but I cann't hide static/public IP. Essentially I want to hide our Public/Static IP (there is static/public IP for all systems in our company) from outside Internet. To achieve this I guess I need other software apart from Mikrotik router gateway setup. can anyone suggest me Is there any other software to achieve my requirement? I know about squid proxy but am not sure whether It can hide our static/public IP. Note: we have assigned public/Static IP to all systems of our company since we have rights to access our company's system from anywhere by dedicated laptop(given by our company with more security) through VPN connection.

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• DB auto failover in c# does not work when the principal server physically goes offline

  - by user62521

  I'm setting up DB auto failover in C# with SQL Server 2008 and I have a 'high safety with automatic failover mirror' using a witness setup and my connection string looks like "Server=tcp:DC01; Failover Partner=tcp:DC02; database=dbname; uid=sewebsite;pwd=somerndpwd;Connect Timeout=10;Pooling=True;" During testing, when I turn off the SQL Server service on the principal server the auto failover works like a charm, but if I take the principal server offline (by shutting down the server or killing the network card) auto failover does not work and my website just times out. I found this article where the second last post suggests that its because we are using named pipes which does not work when the principal goes offline, but we force TCP in our connection string. What am I missing to get this DB auto failover working?

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