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• How to calculate required switch speed based on network usage?

  - by tobefound

  I have a 48 port HP Procurve Switch 2610 (J9088A) that can handle 13.0 million PPS (packets per second) and features wire speed switching capacity at 17.6Gbps. First off, what does that REALLY mean? Where do I start when trying to figure out if my office (with 70 employees) will be well setup with this switch? How to calculate through-put based on a user average load of X MB per day? 90% of the folks will only be sending email, access random websites, etc... the other 10% will be conducting heavier tasks like moving image files (10 MB) across network shares, constant external FTP streams through the switch to a server etc... Is this switch good enough?

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• Private VOIP network

  - by SuppositoryPlacebo

  I own a small private security services business. Some of my clients require 2-10 security officers per location. I'm trying to think outside the box in order to solve my communications problem. I'd rather not buy or lease hf radios or voip systems at the current rates. I'm wondering if there is an existing system, or if is at all possible, to setup a private communications network using only a server and bluetooth devices or a wifi/bluethooth combination. http://25.media.tumblr.com/tumblr_m44f0pn7BL1rwp6tgo1_1280.png I don't need "radio" per se. I just need a simple, private voip network. Is there an existing device that consists of nothing more than a wifi adapter to control a bluetooth device?

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• How to use 2 or more internet connections on the same network?

  - by Rogue

  Living in a joint family we have 3 internet connections, each floor has one internet connection which is split per floor. Each internet connection is shared between 4-5 computers using a switch per floor. Each of these internet sharing networks are independent of each other. What I want to achieve here is a local network (for local messenger and file sharing) that can combine all the 3 independent networks, problem is that whenever I try to do that the whole network tends to use just one internet connection. I have all the necessary hardware. How do I solve this problem, one approach could be that I could get one PC to act as a server and bridge the internet connections and then the whole network would have to access the internet through this server. Theoretically this could be possible but I have never tried this approach in real life. Also if certain computers need be restricted from internet access how would this be possible on the same network?

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• How do you pick what server setup you need?

  - by ed209

  I recently started receiving pubsub data feed from etsy. It averages around 250 notifications per minute. But obviously, when the USA wakes up that spikes quite heavily. I want to be able to deal with those spikes (about 3 per day) but the rest of day is fine. What's the best method of getting the right server configuration. My current approach is to keep upgrading until the server stops dying... next leap is: Processor: AMD Phenom II X6-1055T HEXA Core RAM: 4GB DDR2 SDRAM HD1: SATA Drive (7,200 rpm) (+500 GB 7200 RPM SATA hard drive) HD2: SATA Backup Drive (+500 GB SATA (7,200 rpm)) OS: Linux OS (+CentOS 5 64-bit) Bandwidth: 6000GB Monthly Transfer (3000 in + 3000 out) (+100M uplink port) What's the best approach to working out what sort of server setup you need?

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• What's the deal with NTFS tags in windows 7

  - by polarix

  So back in the days of 'longhorn' there was this WinFS idea which was both cool looking and scary looking. Then it seemed to disappear, but we were told that many of the concepts would be rolled into Vista. Then maybe Win7. Anyway, nowadays if you look at a win7 Explorer window, you can have columns that have a lot of tag-based info about a file (right click on column header-more...), including one called "tags". Is this something in NTFS that can be modified per-file somehow? Is its GUI hiding, or is this something that's infinitely-delayed, or is it just a figment of my imagination? Sure would be nice to be able to get around the NTFS path 256 character limit for searches, and to filter file folders per Excel 2007.

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• BES 5.0 and MAPI calls to exchange system

  - by nysingh

  We have been using BES 4.1(5) for a while now and it has been a resource hog on exchange due to high number of MAPI calls. I have heard that BES 5.0 is even worse. the comparison i heard is that BES 4.1 is makes MAPI calls equal to 5 outlook clients per BB user and BES 5.0 makes MAPI calls equal to 10 outlook clients per BB user. can someone confirm if it is true? is BES 5.0 is really that bad in MAPI calls and for exchange performance. ? thanks

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• Incrementing ticket numbers each time I print

  - by Danny

  I have an excel sheet where I have a set 4 identical tickets to print per page which we use for stock takes. Rather then creating a huge document with 1000 pages for 4000 tickets each with their own unique ticket number (starting from 1) I would like to find a Macro or function which will print a page with 4 tickets on (1,2,3,4) then continue to print another with (5,6,7,8) and so on. I have found some code that people have already written but it has only applied to one number changing per page rather than 4 simultaneously and being a complete visual basic novice, I was unable to change the code to suit my preferences. If someone could explain simply how I could achieve this I would be very very grateful :)

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• Email server - Disk quota sizes - suggestions?

  - by Ian H

  Working out a new server for an agency of 200 Employees - with approx 240 email accounts. Internally I'm arguing with myself over the amount of drive space to allocate to each user for the disk quota, I'm just looking for suggestions. Once i have a quota size decided, it will define the solution for storage. I've had everything from 4 GB per account ( which i feel is being generous ) down to 500 Mb ( with is rather restrictive in today's day and age. ) Thing is 4 GB per acocunt is just under 1 TB of allocated storage for email alone. Does anyone follow a "rule of thumb" or have thoughts on this? thanks in advance

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• Somebody knows why the sectors of the IBM floppy disk are named 1 to 8 (and not 0 to 7 )

  - by Olivier Briand

  I am now programming on a 8 bits Z80 computer with CP/M 2.2, (as a hobby) and the floppy disk format is IBM, 40 tracks, 8 sectors per track, 512 bytes per sector. free space is 154 Ko on each face of the disk. Why the sectors are indexed 1 to 8 (and not zero to seven, as usually is seen with computers)? The catalog of the floppy disk is on the track 1 (sector 1 to 4, 64 entries). I'm wondering is the catalog on track zero? Is the zero track reserved to included a system (as track 0 & 1 are reserved to the system on a CP/M floppy disk, and catalog is on track 2)?

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• Windows Desktop Randomly Switches Resolution

  - by bobber205

  Once per log in a specific account, Windows XP is switching to 800x600 and 8 (looks like) bit color. It then after a few seconds switches back to the regular settings. This, so far, has only happened, once per log in session but it is becoming very annoying for the end user. :P Any ideas? I've tried turning off hardware acceleration as well as getting rid of her picture desktop wallpaper but nothing has made a difference. Thanks for any help!

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• overload environment

  - by Richo

  I've recently switched across to nesting my home directory across all my machines in an svn repo, meaning that my utility scripts, configuration (irssi, vim, zsh, screen etc) as well as my .profile and so forth are easier to keep up to date across all the places I login. I use a set of sourced .local files to override them on a per site basis as required. As it stands, many of my scripts inherit some form of configuration, and for the most part I've been setting an environment variable in .profile, and then if needed on a per site basis overriding it in .profile.local This works great, but are there pitfalls in having a stack of environment variables? If I take my default environment from within an X session before any of my personal configuration I have not even increased it by 50% but some of the machines I work on are low resource, am I bloating my system unneccessarily, or being needlessly paranoid? Should I start moving this config into seperate flatfiles that are loaded as needed? This means extra infrastructure, or alternately writing a single module for storing config that all of my utilities can inherit.

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• How do I change the output line length from the "top" linux command running in batch mode

  - by Tom

  The following command is useful to capture the current processes that are taking up the most CPU in a file: top -c -b -n 1 > top.log The -c flag is particularly useful because it gives you the command line arguments of each process rather than just the process name. The problem is that each line of output is truncated to fit on the current terminal window. This is ok if you can have a wide terminal because you have a lot of the output but if your terminal is only 165 characters wide, you only get 165 characters of information per process and it is often not enough characters to show the full process command. This is a particular problem when the command is executed without a terminal, for example if you do it via a cron job. Does anyone know how to stop top truncating data or force top to display a certain number of characters per line? This is not urgent because there is an alternative method of getting the top 10 CPU using processes: ps -eo pcpu,pmem,user,args | sort -r -k1 | head -n 10

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• Load balanced proxies to avoid an API request limit

  - by ClickClickClick

  There is a certain API out there which limits the number of requests per day per IP. My plan is to create a bunch of EC2 instances with elastic IPs to sidestep the limitation. I'm familiar with EC2 and am just interested in the configuration of the proxies and a software load balancer. I think I want to run a simple TCP Proxy on each instance and a software load balancer on the machine I will be requesting from. Something that allows the following to return a response from a different IP (round robin, availability, doesn't really matter..) eg. curl http://www.bbc.co.uk -x http://myproxyloadbalancer:port Could anyone recommend a combination of software or even a link to an article that details a pleasing way to pull it off? (My client won't be curl but is proxy aware.. I'll be making the requests from a Ruby script..)

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• VPC on Windows 7 very slow network

  - by Shigg

  I have a Windows 2003 virtual machine which I use for website testing. I've just installed Windows 7 and am using the new version VPC (not xp mode). When I try to copy a file - I need to copy some big databases across - I get a file copy speed of about 20k per sec. Copying from one PC to another on the real network transfers files at 13mb per second. Any ideas what may be causing this? I've turned off differential network compression on win 7. The Virtual HD is on a seperate physical drive to the OS. Running Windows 7 64 bit on a dual xeon with 16gb ram and 10,000 rpm drives. Tried installing VPC 2007 but windows blocks it running saying its not compatable. Many thanks for any ideas.

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• HTTP transfer speeds start fast then slows to a crawl

  - by AnITAdmin

  We just got a new dedicated 1 gigabit server running IIS. The CPU is 15% or less, the RAM (4 GB total) has 3 GB unused... We are pushing 110 mbits per second... Speeds are really slow.. And, if fact, here's how it happens: We connect, and then the speeds are really fast, and quickly decline to 40 kBps or less. What's going on? It seems the server just wont go above 120 mbits per second. The files are all very large. 50 MB to 500 MB... Could this be a factor? Again, CPU, RAM, UI responsiveness when accessing remotely all seem fine.

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• Printer recommendation

  - by Coding District

  Hi guys, I'm looking to buy a printer for home use and I'm not sure which one to get. I'm not very good when it comes to printers. Here's what I'm looking for: cheap (least $ per page) good quality (last longest, any specific brands to avoid?) not heavy printing (let's say ~5 pages per week) OK quality (I don't need "the best". I'm not going to print any photos but will need color) can scan, fax, and print I'm currently looking at these two since it's boxing day tomorrow and they're on sale: http://www.bestbuy.ca/EN-CA/product/id/10155178.aspx http://www.bestbuy.ca/en-CA/product/hewlett-packard-hp-officejet-wireless-all-in-one-inkjet-printer-4500-wl-4500-wl/10146663.aspx?path=14c256643988a02e34424eec10028145en02 Can I get some opinions about the above?

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• What is the best way to configure the number of workers in Apache?

  - by rbm

  My site receives a lot of traffic for 2 hours during the day (2000 hits per minute). The rest of the day receives less traffic(500e hits per minute). I have been experimenting with the MaxClients and MaxSpareServers values but I still get some downtime during peek hours. How can I calculate the best values for my configuration based on the amount of ram that I have ? Each process is like 36-40 M of Memory total used free shared buffers cached Mem: 3096 793 2302 0 0 0 -/+ buffers/cache: 793 2302 Swap: 0 0 0 Values that I am using now <IfModule prefork.c> StartServers 10 MinSpareServers 22 MaxSpareServers 60 ServerLimit 90 MaxClients 90 MaxRequestsPerChild 400 </IfModule>

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• Is it possible to group chrome extension processes?

  - by Shajirr

  I have a problem with Chrome - most extensions, even those which consume merely 5-10 MB of memory, each have their own process, and because of that Chrome uses a single process for all the tabs, which consume a lot more memory compared to extensions, even with --proccess-per-tab switch. This behavior seemes illogical - why do you need extensions in separate processes if you can't use your browser properly when it takes 5-10 seconds just to load a tab and freezes constantly? Is it possible somehow to limit the number of processes which can be used for extensions, maybe group them to 10 extensions per 1 process?

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• Why do SSD drives get so much more expensive as they get larger?

  - by futuraprime

  Normal HDD costs go up very little as drives get larger. For example, an average 1TB drive costs a little under $90, 2TB costs a little over $100, and a 3TB drive costs close to $150. For HDDs, the cost per GB goes down as the number of GB goes up. SSD costs don't work like this: a 128GB SSD goes for $120ish, 256GB goes for $250ish, and 512GB drives get up to $600. The cost per GB goes up as the number of GB rises. What is it about SSDs that makes them so much costlier as they get larger?

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• Is there any script to do accounting for the proftpd's xferlog?

  - by Aseques

  I would like to convert from the xferlog format that proftpd uses into per user in/out bytes, to have a summary on how much traffic does each user use per month. The exact format is this: Thu Oct 17 12:47:05 2013 1 123.123.123.123 74852 /home/vftp/doc1.txt b _ i r user ftp 0 * c Thu Oct 17 12:47:06 2013 2 123.123.123.123 86321 /home/vftp/doc2.txt b _ i r user ftp 0 * c So far I only found a script that makes a nice report but not exactly what I needed, that one can be found here I might create a fork of this one and place it somewhere but it probably has been done a lot of times already. Just found a well hidden page in proftpd site with some more examples here

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• Suggestions for hosted file sharing services

  - by Jon

  Before I pose my question, I will give some insight as per my scenario: I work for a small business (cost is an important factor) Our bandwidth is limited and would not support an in-house FTP server We need to share files (mostly pdf, inDesign, Illustrator documents) to our clients, and as we expand, we are finding that our current locally-hosted FTP solution is too slow and is becoming a detriment to our sales team. What we need is a remotely hosted solution to share files with our clients, specifically with the following features: Greater than 100gb of secure storage The Ability to distribute unique log in credentials to clients, granting access to a personalized directory or folder, while limiting access to other files on the server. A relatively simple web-based UI for clients with limited computer knowledge We have considered a dedicated remote server, and web-based services (box.net, yousendit.com, onehub.com, filesanywhere.com) but I am unsure as per the direction we should be taking - have I left another solution out? What would you suggest? Thanks in advance.

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• Why mysql 5.5 slower than 5.1 (linux,using mysqlslap)

  - by Zenofo

  my.cnf (5.5 and 5.1 is the same) : back_log=200 max_connections=512 max_connect_errors=999999 key_buffer=512M max_allowed_packet=8M table_cache=512 sort_buffer=8M read_buffer_size=8M thread_cache=8 thread_concurrency=4 myisam_sort_buffer_size=128M interactive_timeout=28800 wait_timeout=7200 mysql 5.5: ..mysql5.5/bin/mysqlslap -a --concurrency=10 --number-of-queries 5000 --iterations=5 -S /tmp/mysql_5.5.sock --engine=innodb Benchmark Running for engine innodb Average number of seconds to run all queries: 15.156 seconds Minimum number of seconds to run all queries: 15.031 seconds Maximum number of seconds to run all queries: 15.296 seconds Number of clients running queries: 10 Average number of queries per client: 500 mysql5.1: ..mysql5.5/bin/mysqlslap -a --concurrency=10 --number-of-queries 5000 --iterations=5 -S /tmp/mysql_5.1.sock --engine=innodb Benchmark Running for engine innodb Average number of seconds to run all queries: 13.252 seconds Minimum number of seconds to run all queries: 13.019 seconds Maximum number of seconds to run all queries: 13.480 seconds Number of clients running queries: 10 Average number of queries per client: 500 Why mysql 5.5 slower than 5.1 ? BTW:I'm tried mysql5.5/bin/mysqlslap and mysql5.1/bin/mysqlslap,result is the same

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• Is IMAP (un)subscribe meant to work accross mail clients?

  - by equaeghe

  I read my IMAP-mail on different computers/mail clients. I wanted to unsubscribe from the majority of my folders in Outlook. Later, I noticed that on another computer, where I use Thunderbird, I was also unsubscribed from those folders as well. This is not what I wanted (at all), so I subscribed again under Thunderbird. The effect was that I also got subscribed again under Outlook. So I guess this means (un)subscribing to IMAP folders is an account-coupled thing, not a per-client thing. Is there a way to achieve (un)subscribing per client?

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• In terms of load handling, which is better: one server or two of equivalent power?

  - by seldary

  My goal is to figure out if i'm better off with one strong server, or multiple weaker servers with a load balancer. Does the fact of splitting the load between servers have an effect on the total load my website could take? It's hard to single that out, because there are of course a lot of parameters that affect the results, so some assumptions: Putting failover considerations aside - I know it matters, but for the sake of the question's simplicity, lets assume nothing fails. The servers in the multiple servers option have an accumulated "power" equivalent to the one server option (about the same amount of cores and RAM space). If that is too theoretical, here is a concrete question that could help: Suppose I have several instances of exactly the same server - lets call it S. Suppose that server S can serve a load of up to X calls per time unit. Will two S servers with a load balancer serve 2X calls per time unit? significantly more? significantly less?

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• Apache with mod_perl eating memory when idle

  - by syneticon-dj

  An Apache webserver running a mod_perl application is exposing abnormal memory usage - after the "day load" ceases, the system's memory is being exhausted by the Apache processes and oom_killer is being invoked. As the load returns the following morning, the memory usage normalizes - probably because Apache workers get recycled periodically if a sufficient number of hits is generated: This is the graph for apache hits per second to correlate: The remaining 2 hits per second throughout the night are induced by HAProxy checks - it runs HEAD http://mydomain.example.com/running HTTP/1.0 requests against the server every half a second with "running" being a static file (i.e. not invoking any perl code). It also seems that disabling these checks remedies the memory usage problem, but obviously cannot be a solution. All of 3 similarly configured servers (behind HAProxy) expose this behavior. The running OS is Ubuntu 10.10, Apache version 2.2.16. This seems to be a memory leak but I have no idea how to start debugging it - any hints?

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