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• My server is running out of memory, despite having all swap free

  - by Biohazard

  I am using Debian 6 (Squeeze). The server has 4gb of memory in it, and 8gb of swap. I'm starting to get memory alloc errors at high application load times, but from top command: Mem: 4055944k total, 3915436k used, 140508k free, 10444k buffers Swap: 7999480k total, 0k used, 7999480k free, 3604496k cached The system isn't even trying to use the swap? Why would this be happening? I would like to upgrade the primary memory, but this isn't possible just right now. Thanks.

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• How to record my voice on a Mac Mini with headphones?

  - by user718408

  I'm try to record my voice via the headphone on a Mac Mini, but it's not working. I saw on Apple's site that the Mac Mini can record voice, but it doesn't seem to be working for me. Here is a hardware overview: Model Name: Mac Mini Model Identifier: Macmini3,1 Processor Name: Intel Core 2 Duo Processor Speed: 2.26 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 3 MB Memory: 4 GB Audio: Make: Intel High Definition Audio Audio ID: 65 Headphone connection: Combination Output Line Input connection: Combination Input Speaker connection: Internal S/PDIF Optical Digital Audio Output connection: Combination Output S/PDIF Optical Digital Audio Input connection: Combination Input Any ideas how I can successfully get recording working?

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• Hosted Kerio Mailserver vs. Hosted Exchange

  - by Dayton Brown

  Hi all, I'm in the beginning stages of migrating from an internal exchange server (2003) to external hosted services. We don't have a huge user base, less than 100, but we need to support BlackBerries, iPhones, Outlook RPC/HTTP, etc. I really like exchange hosted providers (I've used intermedia in the past) but pricing is a bit high. Does anyone have any experience with Kerio? It looks great, but I'd like to hear some unbiased opinions. Or biased if you are really happy working for a particular hosting company ;-)

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• Tomato QoS: Why is some traffic unclassified when there are classifications for it?

  - by Armitage

  Ok, I am trying to tweak my router to give priority to some traffic. My classifications seem to cover just about everything but I still see ~60 to ~80% of the traffic as unclassified: TCP 192.168.1.100 64137 192.168.1.1 80 Unclassified TCP 192.168.1.100 64175 192.168.1.1 80 Unclassified TCP 192.168.1.100 64144 192.168.1.1 443 Unclassified I assume that the 64### ports are just what my WAP uses to send packets inside my home network. But my classifications seems to cover any traffic for destination ports 80 and 443: (partial list) TCP Dst Port: 80,443 High WWW TCP/UDP Dst Port: 1024-65535 Lowest Bulk Traffic Why do I have so much unclassified traffic if I have a classification that should cover it?

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• How to extract corrupted RAR files

  - by Anyname Donotcare

  I try to extract a file from set of .RAR parts. I always get the following error: Corrupted so I tried many programs to extract the corrupted RAR files. I have 10 parts, each one 400MB big. The last progam I used was Recovery toolbox for RAR. It gave me the following message: Severity:!High Message:Recovery error for file XXXX with message set file pointer error. The program extracted 2GB of data, but it should extract 4GB. Is there any way to extract the content or am I supposed to download the files again from another server?

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• Why does a website server recieve local files much slower than recieve files on other websites?

  - by T...

  The server at http://any2djvu.djvuzone.org receives same files from local computers much slower than from links on other websites (with the same files have been uploaded to the other websites, such as dropbox.com). The speed of uploading a file from local computers to other websites such as dropbox is also much faster than to any2djvu website. For example, a pdf file of 17MB needs more than 1 min to be uploaded to any2djvu server from a local computer with normal ISP such as Comcast High-speed internet, but takes less than 3 seconds from a dropbox link to any2djvu server, and takes around 10 seconds from the same local computer to dropbox. I wonder why there is such big differences for the speeds of different uploading ways to a web server? Thanks!

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• Win7 MCE seems unable to play ripped DVDs

  - by ilivewithian

  I'm running Windows 7 and am using mymovies.dk to rip the dvds to my harddrive. However, playback isn't watchable as the picture is very stuttery and blocky, only shots that show the same image for a few seconds get shown properly. The dvd's are ripped as the straight folder structure and if played in XBMC are fine. I've tried installing both the cccp-project.net and latest div-x codecs, but that doesn't seem to have helped. I'd like to stick with MCE as it has a high WAF (wife acceptance factor). Any suggestions?

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• Windows Server - Dual NIC Bandwidth Pooling

  - by tsilb

  I have a Windows Server 2008 machine with dual NICs. Both are plugged into the same switch in a typical one-switch, one-gateway home network. This server is used almost exclusively for inbound connections. It hosts a web server (IIS 6), SQL server, and file server (via LAN UNC paths and mapped drives). How do I make best use of inbound bandwidth across both NICs? For example, if I connect to it by hostname and one of the interfaces has high traffic, I'd like the new connection to use the other interface.

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• Unable to mount portable hard drive on Ubuntu

  - by VoY

  My portable hard drive (WD My Passport), which used to work correctly now does not automount on my Ubuntu system. It does work on a Windows machine or even when plugged into WD HD TV, which is a Linux based device. There's one NTFS partition spanning the whole drive. When I plug the disk in, I see the following in dmesg: [269259.504631] usb 1-2.2: new high speed USB device using ehci_hcd and address 20 [269259.604674] usb 1-2.2: configuration #1 chosen from 1 choice However it does not mount in GNOME and I don't see it when I type: sudo fdisk -l Any suggestions why this might be? I repaired the partition using chkdsk on Windows, so the issue is probably not filesystem related.

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• serving static assets via http is really slow compared to sshfs (apache2/nginx)

  - by s1lv3r

  After migrating to a new VPS I had some users complaining about slow loading images on their sites. After creating some test files with dd I realized that I can download all files via sshfs with full speed while downloads via web are painfully slow. The larger the file is and the longer the transfer takes, the slower the transfer speed gets. I thought I had some problems with Apache and just spend the whole evening with replacing Apache2 against nginx for static file serving - with no effect at all. No I/O wait states in top. Tons of RAM free, no high CPU utilization and hdparm shows a decent I/O performance at all times. I just have no idea anymore, what's happening on this server. This is a link to a demo file: http://master.dealux.de/file.tgz Anybody an idea what I can check out?

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• Short USB cables not charging?

  - by tropolite

  I find this a strange problem but I can't find anything online about it. Recently I purchased a few short USB cables (20-30cm), to use in my car's USB connector to charge my phone. Strangely an older longer USB cable (1.2m), charges the phone fine (and the icon changes to show charging). With any of the short cables in the same USB slot no charging happens. Both the long and the short cables are USB2 compatible. I naturally assumed the short cables were faulty but connecting them to a PC or connecting to a high capacity external battery charging is successful using all the short cables and longer cables. Hopefully someone here is able to give me an explanation of the problem and how I can overcome this and use a short cable where it is most appropriate. Thanks

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• SQL 2008 Replication over Internet

  - by Akash Kava

  We have decided to put our servers in data centers on east and west coast of US, to keep high level redundancy. After evaluating number of replication options, apart from VPN there is no other way to do replication for SQL Server. We are investigating VPN but I have following questions. Our Large DB consists of media information (pictures/movies/audio/pdf) etc, so we are not very concerned about security because they are not financial sensitive data. SQL 2005 supports or can be configured to support replication over internet? If Yes then should we downgrade to 2005? If SQL 2008 Publisher is configured for Web Sync, can we write an automatic program (C# Windows Service) to act as pull subscriber and run on the subscriber server and replicate subscriber database? Or are there any API available in SQL where we can write our own program to do replication in very generic way? (In a nut shell, can we write our own C# Windows Service based Subscriber program?)

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• PowerDNS CNAME with multiple A records produces unexpected results

  - by bwight

  This problem from what i can tell is isolated to PowerDNS. The servers are running two packages pdns-static-3.0.1-1.i386.rpm and pdns-recursor-3.3-1.i386.rpm on the most recent version of Amazon Linux. The amazon ec2 loadbalancers are assigned a CNAME with multiple hosts. Below is an example of the actual behavior. Notice how the hosts are always in the same order. [root@localhost ~]# host cache.domain.com cache.domain.com is an alias for xxxxx.us-east-1.elb.amazonaws.com. xxxxx.us-east-1.elb.amazonaws.com has address aaa.aaa.aaa.aaa xxxxx.us-east-1.elb.amazonaws.com has address bbb.bbb.bbb.bbb [root@localhost ~]# host cache.domain.com cache.domain.com is an alias for xxxxx.us-east-1.elb.amazonaws.com. xxxxx.us-east-1.elb.amazonaws.com has address aaa.aaa.aaa.aaa xxxxx.us-east-1.elb.amazonaws.com has address bbb.bbb.bbb.bbb [root@localhost ~]# host cache.domain.com cache.domain.com is an alias for xxxxx.us-east-1.elb.amazonaws.com. xxxxx.us-east-1.elb.amazonaws.com has address aaa.aaa.aaa.aaa xxxxx.us-east-1.elb.amazonaws.com has address bbb.bbb.bbb.bbb Expected behavior is round robin for the hosts [root@localhost ~]# host cache.domain.com cache.domain.com is an alias for xxxxx.us-east-1.elb.amazonaws.com. xxxxx.us-east-1.elb.amazonaws.com has address aaa.aaa.aaa.aaa xxxxx.us-east-1.elb.amazonaws.com has address bbb.bbb.bbb.bbb [root@localhost ~]# host cache.domain.com cache.domain.com is an alias for xxxxx.us-east-1.elb.amazonaws.com. xxxxx.us-east-1.elb.amazonaws.com has address bbb.bbb.bbb.bbb xxxxx.us-east-1.elb.amazonaws.com has address aaa.aaa.aaa.aaa [root@localhost ~]# host cache.domain.com cache.domain.com is an alias for xxxxx.us-east-1.elb.amazonaws.com. xxxxx.us-east-1.elb.amazonaws.com has address aaa.aaa.aaa.aaa xxxxx.us-east-1.elb.amazonaws.com has address bbb.bbb.bbb.bbb The addresses eventually do swap but it seems to be on a 30 minute cache timer changing the TTL of the record doesn't appear to affect anything. It appears as though the resolver has a cache of the response. This adversely affects my application because all of the load is only being sent to one of the loadbalancers (Availability Zones) so if I have servers in two zones then only one zone is under load at a time. Do you know how I can fix this so that each time the host is resolved the order of the addresses is alternating.

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• In Varnish stats, what does "Backend conn. reuses" and "recycles" mean?

  - by electblake

  I have varnish installed and I think it's working properly (not sure if it matters but I am using iptables reroute method to route ports incoming:80 > varnish:8080 > apache:80 Anyway, In varnishstat I see a pretty high Hitrate average (60-80%) which I am working on but I am unclear at what all of the stats presented by varnishstat Specifically the following Backend stats: 380 0.00 0.26 Backend conn. success 10122 15.00 6.85 Backend conn. reuses 267 0.00 0.18 Backend conn. was closed 10391 15.00 7.04 Backend conn. recycles I've read a blog post called "Varnishstat for dummies" which outlines a lot of details of varnishstat (I recommend it for beginners) but it does not go over these Backend stats. Feel free to explain here or link to a resource I've missed :) thanks!

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• map based on specific type of stream

  - by Steven Penny

  Consider the following file Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'infile.mp4': Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1038 Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 386 kb/s Stream #0:2(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 124 kb/s I would like to run a command that uses the video and only the stereo audio. With this particular file I could just run ffmpeg -i infile.mp4 -c copy -map v -map :2 outfile.mp4 However this will not work if the audio streams are switched. How can I tell FFmpeg to use the 2 channel audio only?

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• Kerio group calendaring private/public functionality

  - by bsigrist

  We are considering a change of email servers and Kerio Connect is attractive. However, I am concerned about calendaring functionality. I found an old forum post that states the question well: "We want to create a single public calendar that everyone can see - using Windows XP/Outlook 2003/KOC 6.4.1. We want a way for people to put an entry in their own personal calendar and some how mark it so the entry auto add's or syncs with the public one. If an entry is private it wouldn't sync to the shared public calendar... Has anyone ever heard of a way to do this - in any way with any software?" This is a high priority feature, so if Kerio cannot do this, we may consider Exchange. Does Exchange provide functionality like that described?

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• Mac Mini monitor on the move – can I use VNC or a portable monitor?

  - by Jjunju

  I have been investigating the possibility of using my PC to control my soon to arrive Mac Mini when on the move. I can't afford and hope you don't give me answers suggesting buying a MacBook. My Mac Mini is the high end type. Now I have seen that the only viable option seems to be VNC. But how does this work if I am not on a network? Does VNC work with an ad-hoc network? Can a PC be connected to a Mac on such a network? Can this network be configured once at home and then be available on startup on the move? If I have an iPhone, can I use it as my wifi? But then, how would I start the Mac Mini to make the connection, since it wouldn't have a screen on the move? Finally, are there any small portable screens one can carry in a bag?

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• openQRM nagios password reset

  - by Entity_Razer

  Right so, basically the story is that to test a XenServer environment from citrix I deployed a openQRM install from SVN to a ubuntu 10.4 install (on a ESX Environment) All went well installs, I can connect to it, but I can't seem to access the nagios plug in. Every time i wish to go to it i'm asked for a pw, and if I input the pw I wrote down yesterday it just doesn't let me in. I'm trying to reset the password on the nagios plug in now but for the life of me can't find it. Googled high and low for a defenitive working solution but so far no luck. Anyone able to lend a hand ? Cheers ! Ubuntu 10.4 Beta as openQRM openQRM installed from SVN cheers

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• Windows 7 offline files - work temporarily offline even if network connection works

  - by Robert

  Sometimes I am connected via VPN to a network containing the server where files are stored which are cached by Windows offline files feature. Sometimes the connection works good and working this way is not a problem - on other times working is quite a pain because of high latency when working with the files in the Windows explorer. Is there an interactive way how a user (with admin permissions) can temporary suspend online usage of offline files? I already activated the "Transparent caching" group policy feature (Computer Configuration Policies Administrative Templates Networks Offline Files) with a network latency of 200msec but from my experience even if I get ping times to the file server of less than 40msec online usage is quite tenacious. Setting low latency times at this point causes the offline files often to toggle which makes problems with some applications working with several files and requires them to be consistent (like SVN client).

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• New Seagate GoFlex external hard drive reporting temperature 50C and higher--defective or normal?

  - by rob

  I have a brand-new Seagate GoFlex hard drive, and my SMART diagnostics program (CrystalDiskInfo) is warnings me that the drive is running too hot. The lowest reported temperature I've seen it is 48C, and the highest so far is 56C (all of last week, it was at 50C). According to several sources I've found online, including a Google study, hard disks operating higher than 40C have shorter lifespans. The temperature in the room is usually about 23C (74F), and orienting the drive vertically vs. horizontally doesn't seem to affect the operating temperature. Does anyone else have a GoFlex external desktop drive that runs at 40C or cooler? Is my drive just defective, or is this high temperature common for these drives?

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• How to set expiration date for external files? [closed]

  - by garconcn

  I have a site included lots of external files, most of them are gif format. I have no control on the external files, but have to use them(with permission). When I check the site using Google Pagespeed, I got very low score(31) even though the page load is fast. One of the high priority suggestion is to leverage browser caching by setting an expiration date. However, all the files are on external links. I have already set the expiration date for local files.

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• xinet vs iptables for port forwarding performance

  - by jamie.mccrindle

  I have a requirement to run a Java based web server on port 80. The options are: Web proxy (apache, nginx etc.) xinet iptables setuid The baseline would be running the app using setuid but I'd prefer not to for security reasons. Apache is too slow and nginx doesn't support keep-alives so new connections are made for every proxied request. xinet is easy to set up but creates a new process for every request which I've seen cause problems in a high performance environment. The last option is port forwarding with iptables but I have no experience of how fast it is. Of course, the ideal solution would be to do this on a dedicated hardware firewall / load balancer but that's not an option at present.

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• Co-location vs. cloud hosting

  - by RainyRat

  We have a decent-sized server estate: several ProLiants, plus IBM BladeCentre and SANs running a VMWare environment. Due to an imminent premises move, we're not going to have enough space for a server room, so I've been looking at moving everything out to a colo. My boss is more keen on the idea of cloud-hosting everything, which would include a couple of high-traffic websites (about 9m pageviews/month), our Exchange sever (about a million clean emails sent/received monthly), as well as file/print/AD/all the ususal stuff. This doesn;t sound like a good idea to me, but I'm new to the ways of the cloud. Can anyone offer any advice?

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• Instant messanger capable of offline messaging & tolerant of network interruptions

  - by Terry

  I am looking for an instant messaging solution to facilitate communications between recovery vehicles in remote rural areas. All the vehicles have internet connections, but they are intermittent depending on location. Ideally we'd like something that has the following features: Offline messaging: messages sent to clients who are offline will be delivered when they next come online, regardless of whether the sender is still online or not. Lightweight: CPU cycles are limited on the machines in these vehicles. A bloated solution will be an issue. Client platform is primarily win32, but support for osx/linux/mobile devices would be a bonus. Non-chatty: Bandwidth is a precious commodity for us, so services which use a minimal amount are ideal. Fault tolerant: We see plenty of packetloss and high latency, so whatever we use needs to be able to function in trying network conditions. I'm not fussed if we use a hosted platform like gtalk/skype/msn/icq/whatever, and likewise I can run a server if need be. Suggestions would be appreciated!

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• How can I make WinXP bind to ports other than 1025-5000 for outgoing TCP connections?

  - by Chris Dolan

  (I originally posted a similar question on StackOverflow but readers recommended I post here instead) When you create outgoing TCP connections, most applications let the operating system choose which port to use. Most OSes use the IANA recommended dynamic port range of 49152-65535 for this purpose. But in Windows 2003 and earlier (including XP) Microsoft uses ports 1025-5000. Microsoft lets you change the high end of this range via the MaxUserPort TcpIP registry setting, but I see no way to change the low end. I need to have port 4160 free for incoming connections and on rare occasions an outgoing connection steals that port from me before I bind that port.

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