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• Solaris TCP/IP performance tuning

  - by Andy Faibishenko

  I am trying to tune a high message traffic system running on Solaris. The architecture is a large number (600) of clients which connect via TCP to a big Solaris server and then send/receive relatively small messages (.5 to 1K payload) at high rates. The goal is to minimize the latency of each message processed. I suspect that the TCP stack of the server is getting overwhelmed by all the traffic. What are some commands/metrics that I can use to confirm this, and in case this is true, what is the best way to alleviate this bottleneck? PS I posted this on StackOverflow originally. One person suggested snoop and dtrace. dtrace seems pretty general - are there any additional pointers on how to use it to diagnose TCP issues?

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• OpenVPN to connect remote networks, peer to peer instead of client/server possible?

  - by John Robertson

  I would like to connect two remote networks using OpenVPN. I am very new to this we are very small and don't have a sys/network admin. What are the possible setups to have both networks both live on a common LAN via OpenVPN? I would prefer to use the UDP peer model rather than client/server. Is there a way to set that up instead? I can't see how because no computer on existing network A has a routable address to any computer on existing network B and vice versa.

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• Add 802.11n to existing 802.11g environment

  - by Andrew Robinson

  I have a small home network that is currently running 802.11g. Two computers that are capable of 802.11n and two devices (a BlackBerry and a Skype phone) that are limited to 802.11g. I have a few neighbors running 802.11g but their signals are very weak. How big an impact will the two G devices have on N speeds? Will they pull the whole network back down to G? These two devices are hardly ever used where as the other N devices are heavily used. If I add an N router to the network (instead of replacing the G) and set my existing G router to use channel 1 with 20MHz bandwidth and then set the N router to use 6 & 11 for 40MHz will I eliminate the overlap and allow for full speed on both networks?

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• The canonical "blocking BitTorrent" question

  - by Aphex5

  How can one block, or severely slow down, BitTorrent and similar peer-to-peer (P2P) services on one's small home/office network? In searching Server Fault I wasn't able to find a question that served as a rallying point for the best technical ideas on this. The existing questions are all about specific situations, and the dominant answers are social/legal in nature. Those are valid approaches, but a purely technical discussion would be useful to a lot of people, I suspect. Let's assume that you don't have access to the machines on the network. With encryption use increasing in P2P traffic, it seems like stateful packet inspection is becoming a less workable solution. One idea that seems to make sense to me is simply throttling down heavy users by IP, regardless of what they're sending or receiving -- but it doesn't seem many routers support that functionality at the moment. What's your preferred method to throttle P2P/BitTorrent traffic? My apologies if this is a dupe.

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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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• How to edit and enlarge the font in a PDF document? [closed]

  - by Gus

  Possible Duplicate: How to enlarge a PDF document on Kindle? I have a kindle 6". The problem is that I often read pdf files that are technical, therefore, it doesn't get converted very well to Kindle's native format (for example, code blocks get messed, and things like that). When I watch the pdf page, it's very small to read easily, so I have to rotate the screen to a horizontal position in order to see it better, but my page get divided. But some documents would be easy to read in vertical position if I had the chance to enlarge the font size a little bit in a external pdf editor, therefore enabling the reading in the vertical orientation. Is there a way to change the font size in a pdf file?

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• Azure Linux Virtual Machines Price per Hour, Computation or Running?

  - by Arjun Bajaj

  first of all, I couldn't find a StackExchange site on Cloud Computing. I think this is the most appropriate site, because some of you might be using Azure. So I just wanted to know: The Windows Azure Pricing Page shows Linux Virtual Machine Price as $0.013/hr for an extra small VM. The monthly price comes up to about $10. Is this price charged as number of hours of computation done on the VM or number of hours of running the VM? And if I shutdown the VM, will I be charged anything?

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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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• Is TrueCrypt robust against data corruption?

  - by Dimitri C.

  I would expect a TrueCrypt volume to be fragile when it suffers from data corruption. This could happen for example because the hard disk, CD or DVD start to deteriorate, or when an USB stick is unplugged while a write is in progress. On the TrueCrypt FAQ it is mentioned that this problem is limited because the data is encrypted in blocks of 16 bytes. However, I'dd like to know if this really so in practice. Is there anyone who has experienced severe data loss due to only small corruptions?

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• How do I set zone priority in Microsoft DNS?

  - by Justin

  I have a standard small network setup (20 users) on Active Directory. All Windows machines have a primary DNS server as the AD and a secondary DNS server as Google PDNS. I want to setup a DNS entry that exists in real DNS but set it up on our DC so that local requests would route this public domain to a local development machine on the network. I setup the zone in DNS which results in the clients resolving the public FQDN to our internal IP. However, sometimes it still resolves to the "real" value (I check by pinging it). Is there some way to give the zone definition in my DC DNS higher priority? Or will the client that has secondary public DNS always at sometimes have a competing entry for this zone?

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• Which iptables rule do you think is a 'must have'

  - by Saif Bechan

  I have some basic iptable rules set up now for my vps. Just block everything except some default ports, 80,21,22,443. I do get brute forced a lot. I have heard that iptables is very powerful but I have not seen many use cases. Can you give me an example of a(some) rule(s) you always use and give a small example why. I can not find a general best practice post here on SF, if there is any I would like the link. If this is a duplicate I am sorry and it can be closed.

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• How to view status of software RAID 1 resynching?

  - by tputkonen

  I have two 500 GB disks and yesterday I mirrored first drive to the second one using software RAID 1. PC has now been on for 30 hours. Both disks say "Resynching", but there is no progress indicator. In addition, there is a small yellow exclamation mark on both disks. My questions are: How long could the synch take for 500 GB drive with about 150 GB of data? PC has 4 GBs of RAM and AMD dual core 4000+ Is there a way to monitor status of the synching? How can I check what the exclamation mark means?

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• putty pageant - forget keys after period of inactivity

  - by pQd

  in the environment where windows client computers are used to run putty to connect to multiple linux servers i'm considering moving away from password based authentication and using public/private key pairs with pass-phrases. using ssh-agent would be nice, but at the same time i'd like it to 'forget' the pass-phrases after given period of inactivity. it seems that putty's pageant does not provide such feature; what would you suggest as alternative? solutions that i'm considering: patching pageant code [might be tricky, code is probably quite rusty and project - sadly - stagnant] writing small custom application using GetLastInputInfo and killing pageant if the machine was idle for more than let's say 15 minutes [ yes, there'll be separate policy for locking the desktops as well ] using alternative ssh client and ssh agent. any suggestions? thanks!

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• Openoffice.org: Mouse wheel one row at a time possible?

  - by Maksee

  I noticed this in Excel, now in OpenOffice.org calc. One small change in mouse wheel leads to 3 rows (line) change. Is it possible to change in Calc OR/AND in Excel? EDIT: Yes, I know about system wide setting about the number of lines for one notch of scroll. But in some applications this setting is interpreted related to size in pixels so scrolling is predictable, but for some like spreadsheet is not. Since the height of line in a cell differ depending of the cell content, with other setting as 1 you will have a guarantee of unpredictable content before your eyes with only one notch.

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• change email address format with minimal disruption

  - by femi

  Hello, all the email addresses in my organization are in the format [email protected]. this was started when we were a small organization. Now we have grown and need to use something a bit more professional like [email protected] how can this change be implemented with minimal disruption? We currently only use smarteremail. Could recieving ONLY with the old and replying with the new be a solution..till we wean our recipients off the old email address? Any suggestions are welcome. How will moving to exchange help in this instance? Can it be configured to automatically send out using a different address? Thanks

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• High fan speed after return from suspend (on Ubuntu)

  - by Bolo

  Hi, I've got a HP ProBook 5310m laptop with Ubuntu 10.04 (32 bit). When I return from suspend, the fan speed is usually very high: FDTZ sensor reports "90 °C". Yes, the units are wrong, since FDTZ does not report temperature, but fan speed – that's probably just a small bug in reporting. Interestingly, when I plug or unplug the power cable for a moment, the fan speed returns back to normal. My questions: Where can I report this problem? Is it about ACPI support in the kernel? What is the address of the relevant bug tracker? As a workaround for now, how can I programmatically trigger a behavior equivalent to (un)plugging the power cable. More generally, how can I force ACPI to recalculate fan speed? Ideally, I'm looking for something like echo foo > /proc/bar. Thanks in advance!

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• How to configure 1080p HDTV as a monitor

  - by Robot

  I've read several posts that almost answer my question, but not quite. I have a Samsung LN32C530 1080p HDTV I'd like to use as a monitor. I was reasonably successful getting the prior 720p model to work ok using SwitchResX, but I think I just got lucky with the parameters (1360x768@60Hz). I tried the expected (1920x1080@60Hz) values and "nearby" ones, with no luck. Older 720p params actually work, but I get the same small real estate as the older model TV. Trying values near 1080p always displays an image that doesn't match the screen size and is very jagged which makes me think interpolation is making things worse. Also, SwitchResX has a bunch of parameters other than H x W ("porch" etc), and I don't know how they all work together. Any help?

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• What are those white circles on the desktop in Gnome 3?

  - by monk

  I have Fedora 20 with GNOME 3.10.2. On the desktop background (i.e. where the wallpaper is), there are five small white circles centered at the very bottom of the screen. The first is filled, the others are not. I can click those circles, thereby changing which one is filled, like a radio button. I cannot for the life of me figure out what those circles are supposed to do, and it's starting to drive me crazy. Clicking and thus changing which circle is filled does nothing I can perceive, and there seems to be no configuration option anywhere that has anything to do with them. What are those things? Is there any way to get rid of them? Edit: I made a screenshot of my desktop with no programs running. You can see the dot/circle thingies at the bottom. Link: http://www.imageupload.co.uk/images/2014/08/18/Screenshot_from_2014-08-18_235427.png

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• How can we connect TP-link Access Point- TL-WA5210G with Wifi Lan card?

  - by PPS

  I would like to know that, We have a small Wireless Network that covers 40 mtrs indoor. Now we plan to expand our Network Coverage area apporx. 200 Mtrs (Outdoor). Due to our requirement we used TP- Link Access Point TL-WA5210G Outdoor(This AP covers 15Km area). We have 3 blocks between 200 mtrs, We like to connect all the laptops Lan Card directly with required Access-point. What should we do to achieve this, right now we are not getting the full strength signal, when we cross the 80 mtrs. So please suggest me proper configuration for implementing this TP-Link access point. Thanks PPS

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• Trigger ZFS dedup one-off scan/rededup

  - by Jake Wharton

  I have a ZFS filesystems which has been running for some time and I recently had the opportunity to upgrade it (finally!) to the latest ZSF version. Our data doesn't scream dedup but I firmly believe based on small tests that we could gain anywhere from 5-10% of our space back for free by utilizing it. I have enabled dedup on the filesystem and new files are slowly being dedupified but the majority (95%+) of our data already exists on the filesystem. Short of moving the data off-pool and then recopying it back, is there any way to trigger a dedup scan of existing data? It doesn't have to be asynchronous or live. (And FYI there isn't enough room on the pool to copy the entire filesystem to another and then just switch the mounts.)

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• What is the difference between a plain Amazon ec2 instance and beanstalk?

  - by Alex Ford

  I am a solo developer and the sites I'm deploying are very small, usually hobby sites and I have a few questions about the Amazon services. Is there a reason for me to use beanstalk or should I just stick with a single ec2 instance? Should I use RDS for database? I heard someone say that I could just install a database on my ec2 instance, making it cheaper. I'm trying to keep everything as cheap as possible. I need to point custom domains to my sites. Pretty sure that means I have to deal with elastic IPs. Do those work with beanstalk or only with individual ec2 instances? Thanks in advance!

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• How can I make full-screen desktop applications only cover the snapped desktop?

  - by nhinkle

  In Windows 8, you can "snap" two apps next to each other, and one of those apps can be the legacy Windows desktop environment. A convenient application for this (or so I thought) would be to snap a chat client, small browser, or other app while watching content in full-screen on the desktop. The problem with this is that full screen desktop applications will take over the entire screen, even if the desktop is snapped to only occupy 3/4th of the display. What I would like is some way to force "full screen" desktop apps to only cover the snapped desktop area, and to truly go full screen if the desktop is snapped to full-width. Is there some way to configure this? If that didn't make sense, let me illustrate with pictures: Desktop in snapped view with SU chat in mini-browser: What happens when you click "full screen": What I want to happen when I click "full screen" (note this is digitally altered, not a real screenshot)

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• Determine Server specs for a Rails with MySQL database (on AWS)

  - by Rogier

  I developed a intranet applications with Rails (3.2) for one of my customers. There will be around 30-40 employees working with it. Backend is MySQL (5). What would be the best way to determine the servers specs needed? Given: max. load will be roughly 2400 (40*60) HTTP requests (mixed GET / POST) per hour. 15% of these calls are JSON calls (iOS) avg request will make between 5-10 database calls 500-800 SQL INSERTS per day webpages are fairly simple (no images, just text) avg webpage is 15 request (css/js/etc) and total size is 35-45 KB More specific, since they need access from multiple geographical locations, we are thinking of running a bitnami Ruby stack in the AWS cloud (uptime is important). Any thoughts on a AWS Instance (small/medium) and Utilization (light/medium/heavy) ? Thanks!

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• newbie hard drive upgrade question

  - by musoNic80

  I have an Acer Aspire 3500WLMi laptop. It currently has a 40gb hard drive which I would like to upgrade. Could someone talk me through the process? I've listed my concerns/queries... Can I buy and install any 2.5" SATA or IDE hard drive into this machine? Should I buy somesort of USB caddy and clone my existing drive onto the new one via USB then physically swap the drives over? My current disk is partitioned to include a small amount of space for a Ubuntu install. Will a clone keep the current partition sizes or is it best for me to repartition once I've cloned? Many thanks.

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• Tool to bulk speed up/convert an audio file

  - by User1

  I want to listen to certain podcasts on my phone but I have two common problems: The audio is in some weird format (some don't play on my phone). The audio is slow. I want to use something like sox or avconv to bulk convert the files. Since this is just voice and going on a cell phone, small low-quality files would be best for me. I had some good success using avconv: avconv -i weird.wma normal.ogg Unforunately, this command creates an enormous ogg file and I can't get it play faster. Ideally, this particular file would play at 170% of the original speed.

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