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• Determine nginx reverse-proxy load limits

  - by Aaron

  Hi all: I have an nginx server (CentOS 5.3, linux) that I'm using as a reverse-proxy load-balancer in front of 8 ruby on rails application servers. As our load on these servers increases, I'm beginning to wonder at what point will the nginx server become a bottleneck? The CPUs are hardly used, but that's to be expected. The memory seems to be fine. No IO to speak of. So is my only limitation bandwidth on the NICs? Currently, according to some cacti graphs, the server is hitting around 700Kbps ( 5 min average ) on each NIC during high load. I would think this is still pretty low. Or, will the limit be in sockets or some other resource in the operating system? Thanks for any thoughts and insights. Aaron

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• Which process is using my NAS?

  - by sethu

  I have a nas connected to my cluster. The NAS holds all our home directories. When I did a set of experiments last week, saving a 1 GB file to the nas took around 30 seconds. If i do the same to a local disk it takes 18 seconds. But when I tried doing the same process today, it takes 150 seconds. I am unsure what is the problem . Can someone help me pointout the issue? Is it possible to find out which process is accessing the NAS or how much NAS bandwidth is getting used ? Thanks for your help. -Sethu

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• Blocking an IP range without using .htaccess

  - by Chris

  I have a WordPress blog that I am hosting using NearlyFreeSpeech.net. Recently, Russians found it and have been comment spamming me. I don't want to have to trash 30+ Cyrillic comments/day, and I don't want to pay for that bandwidth either. I did a little research, and all the commentors are originating from RIPE delegated IP ranges. Because my blog can only interest people living in the American Southeast, I figured the quick and dirty solution would be to use .htaccess to deny connections coming from 62.0.0.0/8 and 80.0.0.0/8 - 91.0.0.0/8. I wrote a .htaccess file that did just this, but the Russians were still getting through! According to NearlyFreeSpeech.net's FAQ, they can't support IP blocking through .htaccess (dirt cheap hosting comes with a price). I can block comments by IP through Wordpress (I think), but I can't figure out a way to block IP ranges or wildcards. Does anybody know of any other way?

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• Setup Cisco RVS4000 QOS for VOIP

  - by andyknas

  Just switched from dedicated T1's with analog phone lines to cable modem with 10/2 uplink. We're having some VOIP call quality issues on the outgoing side when bandwidth is stressed and I need to setup QOS or a VLAN on our RVS4000 router. Currently all phone traffic (talkswitch device and ip phones) are on it's own d-link PoE switch, and all workstations are on a LinkSys 1GB switch. Both switches are plugged into ports on the RVS4000. I'd like to set it up so that the dlink port has ~512Mbsp dedicated to it for voice at all times. It's my understanding that with a VLAN or QOS I can set this up. I've got QOS setup already with port 5060 to have high priority but it doesn't seem to make a difference.

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• apache performance improvements and maxclients

  - by updog

  I know this has been asked a few (thousand) times around the internet but I was hoping someone whose in the know might be able to comment on my particular setup. I have a web server hosting one site (php/codeigniter) with a wordpress blog in a sub directory. The server has 2GB RAM, 3GHz CPU and I have offloaded the static assets to CloudFlare which is has reduced bandwidth for the actual server by almost 75%. The problem I have is when an email campaign is sent out that links to the site or blog, it slows down. Below is my settings in apache2.conf. Average apache process size is 80M and there is 1.5GB available for apache. <IfModule mpm_prefork_module> StartServers 8 MinSpareServers 5 MaxSpareServers 20 MaxClients 20 MaxRequestsPerChild 2000 </IfModule> I have already setup and installed apc and built some caching into the site and used w3totalcache on the blog. The number of concurrent users is around 2-300 when there is a campaign, are there any further optimisations before

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• linksys Rvo16 redundant link config

  - by Adeodatus

  Hi All I have been given an RVO16 to play with. I'm multihomed and I'd like to set it up so that my primary, highest bandwidth link receives all traffic and the other connection is a hot spare basically. I want them both online but only the primary 1 used until it goes down then all traffic should automatically failover to the secondary link. Those of you that have played on an RVO16, can I do this and if so, how? I imagine I'd have it act as a router and pad the route on one so that the other is never used unless the primary is down. How? Thanks all.

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• How can I limit my data usage over tethering on Windows?

  - by Casebash

  The excess data charges if I go over my tethering data limit are ridiculously. Fennec already stated the question well. Because of this, and on general principle, I'd like to have some tools which permit me to do things like: Monitor the amount of bandwidth that I've used I think I can do this from Sprint too, but on-the-computer is nice too on-the-computer gives me a possibility of breaking it down by application See what sort of programs are using the Internet connection I could use, like, Wireshark, but that's a bit too micro-level to be practical Keep those programs, and the operating system, from doing things like "downloading an operating system update" while on the mobile hotspot Related I want to monitor and limit OS X's data transfer while I'm tethering via my iPhone

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• Should I use 802.11n with a 15 Mbps ISP (Comcast Cable)?

  - by stackoverflowuser2010

  I currently own a LinkSys-WRT54GL 802.11a/b/g wireless router, and my ISP is Comcast Cable providing me with 15 Mbps (that's bits per second, I believe) download speed. I am wondering if there is any benefit with using an 802.11n wireless router to access the Internet? The maximum theoretical speed of the WRT54GL router is 54 Mbps (802.11g), which is faster than the 15 Mbps provided by my ISP. I know that 802.11n has a max bandwidth of 300 Mbps, and it would help for intra-house transfers, such as streaming video from one computer to another. But is there any benefit to 802.11n for Internet activity, such as web browswing, gaming, and streaming video from Netflix?

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• Home network with Windows 7 as router

  - by Michael

  Background: I have tried to use routers, but so far all of them can't handle the bandwidth, number of connections eventually limited by the hardware resources, so overall the home routers are decreasing the internet speed. I went through DD-WRT and stuff like that. Question: What I want is to use my Windows7 PC as router. It has 2 LAN cards. I'm going to connect to this router another desktop 2 pcs and notebook through wireless router. The main question is what is the most efficient way to turn this Windows7 box(and I need Windows for native NTFS support) into router with NAT/Routing/Firewall functionality? Is there any routing software recommended for this purpose or I should just use windows native "Internet Sharing"? I'm going to run SIP phones in the LAN, so I need friendly NAT(Full cone perhaps). Also I'm going to have FTP server on that Windows7 "server" PC. As firewall I'm thinking about Comodo. Need to drop all incoming, unless explicitly allowed.

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• Windows XP IIS5 performance across Network

  - by davidsleeps

  Hi, Just wondering whether Windows XP with IIS5 running needs any extra configuration to be suitable as a web server...I'm not considering using this for anything other than a web server on a small network for testing development etc One of the reasons I'm concerned though is that we've deployed an asp.net application to a workstation with Windows XP, and running the application using a browser on the machine (so accessing it through localhost/myApp/page.aspx and not accessing it through the network) runs the application really quickly. If another machine on the LAN accesses the same page (using http://ComputerName/myApp/page.apx) then the whole application runs noticeably slower...yet the computers are connected on a gigabit switch...so I wouldn't have thought network latency or bandwidth could be an issue... Does Windows XP need anything etc enabled or changed or network settings for it to work correctly?

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• Our wi-fi at work is ridiculously slow, will adding more range extenders improve it?

  - by john

  At work, we have two wireless networks (e.g., Work1 Work2); the Work2 is used downstairs and Work1 is used upstairs. However, both are notoriously slow. The connection is better when we are wired in, but unfortunately due to our building being very old and our company growing very fast, most employees are not seated near the walls where the ethernet cables are. I had Cox, our ISP, run a bandwidth utilization test and it doesn't seem like we are capping out on upstream/downstream, which leads me to believe that it's strictly an issue with the wireless networks (which were implemented before I got there). The wireless networks are both Apple Airport Extremes. Is there anything I can do to improve the situation for everyone? Speeds are extremely slow, and sometimes drops out.

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• 19" Rackmountable fast storage arrays

  - by Eruditass

  I'm in need of some fast (15+ GB/s write) and somewhat large (50 TB+) storage subsystem with a standard storage interface. I'd prefer something other than Fibre Channel, which admittedly appears to be the most standard interface. RAID 5 is sufficient. What are the cheapest / smallest products from vendors to look at for building this subsystem? I've looked at DDN and TMS so far. Small: Under 20U Cheap: Under a million Edit: I'd really like to cut back costs as much as possible at the expense of capacity. How cheap can these bandwidth requirements be met?

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• Virtual dedicated server repetitive draining RAM, OOM constantly

  - by Deerly

  My linux (fedora red hat 7) virtual dedicated server has been experiencing OOM multiple times a day for the past several days. I thought the issue was with spamd/spamassassin but after disabling this the errors remains. The highest usage displayed on ps faux --cumulative: USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 28412 8.7 0.5 309572 109308 ? Sl 22:15 0:17 /usr/java/jdk1. mysql 7716 0.0 0.0 136256 18000 ? Sl 22:12 0:00 _ /usr/libexe named 17697 0.0 0.0 120904 15316 ? Ssl 22:09 0:00 /usr/sbin/named I'm not running any java applications so I'm not sure why the top issue is showing up. It is frustrating as I barely have anything running on the server and use the tiniest fraction of bandwidth. Any help or suggestions on zeroing in on the source of the drain would be much appreciated! Thanks!

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• Suggestion for Colocation?

  - by John M.

  Anyone has a suggestion for a good colocation company? I just don't know much about who is the best colocation provider. I have been using EC2 and S3 and it is becoming really expensive due to the bandwidth cost. Especially, people downloding contents from S3. I have looked at Peer1 and other few companies. I am not sure why they don't list their price on their website for their colocation service. They force you to chat with them and waste your time.

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• Suggestion for Colocation?

  - by John M.

  Anyone has a suggestion for a good colocation company? I just don't know much about who is the best colocation provider. I have been using EC2 and S3 and it is becoming really expensive due to the bandwidth cost. Especially, people downloding contents from S3. I have looked at Peer1 and other few companies. I am not sure why they don't list their price on their website for their colocation service. They force you to chat with them and waste your time.

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• Full Screen Flash is choppy (nVidia GeForce 8200M)

  - by Joel Martinez

  I have a new compaq presario laptop (I asked SU for advice before I bought it :-) ). It has a nVidia GeForce 8200M video card. When I try to play a flash video full screen, it plays really choppy. This is a brand new computer and is well more powerful than my previous computer so I know it's not a matter of the full screen being too processor intensive to play, or a bandwidth problem. Even playing HD hulu videos full screen was fine on my previous laptop. Any advice on how to get better performance here? edit: World Of Warcraft is able to play at a great framerate, so this machine should definitely be able to handle a simple little flash video ;-)

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• How do I see what connections are being made?

  - by Coldblackice

  My DDWRT router is showing that my computer has a connection count around 600! The router is at 100% CPU use. How can I see what's making all the connections? So far, I've opened up Resource Monitor and checked the network tab. I can sort by which program is using the most network bandwidth (Pale Moon browser), but I can't see what's making all of the connections. Or rather, where all the connections are being toward (trying to find what tab must be making all of these connections). I've also tried netstat -A, but it apparently doesn't show the actual number of connections being made. At least, the list of established connections isn't very long, by any means (like enough to account for the 500+ connections apparently being made.

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• speeding up cvs pserver over WAN

  - by Aleksandar Ivanisevic

  I have a remote location with 5 developers that are using a CVS (pserver) repository in main office via WAN, but the bandwidth i have is only a couple of hundred kbps so CVS operations are fairly slow. Is there any way to speed this up? I can rsync over a local copy of the CVS root(s) every couple of minutes, so this can handle the updates, but obviously not the commits. Is there any way to say to CVS to update from one server, but push to another one? Any other ideas?

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• Windows and Linux applications to show cumulative uploads/downloads for each app, at a glance

  - by jontyc

  I've read few quite a few other threads on SU, but they have been focused on instantaneous/average bandwidths (B/sec) rather than cumulative download/upload totals for a period. Either that or they don't drill down to application level. Resource Monitor in Windows 7 only shows bandwidth. I've just been trying NetLimiter and whereas it can show total uploaded/downloaded, it's a case of having one stats window open per application, as opposed to a table showing all applications at once. Looking for applications for both Windows and Linux (Ubuntu), but they don't need to be the same.

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• How should I host a site that could potentially get a short spike in traffic of 1000%+

  - by James Simpson

  This is a purely theoretical question, but what if I had a site that would normally only get a couple thousand hits a day, but for a few days each month that could shoot to several hundred thousand or even several million hits over the period of 1-3 days. The site would be pretty bare-bones (as in, 2-3 total pages with 1-2 max MySQL queries on each page and some PHP), so bandwidth wouldn't be the issue, but sheer volume taking down the site would be the main concern. Cloud hosting seems like the best way to go, but would something like Amazon EC2, MediaTemple, or something else be the right choice in this case?

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• PXE boot very slow when PXE server is virtualbox

  - by sqrtsben

  As I read in questions here and on the Internet, PXE and Virtualbox don't seem to like each other too much. My problem is the following: I have a virtualized machine which hosts the DHCP and PXE server for 10 native clients. They are rebooted roughly every 10 mins and on each reboot, they need to boot a small linux (the initrd is ~4MB). Before, I had a native machine running and booting via PXE was very fast. Now, looking at the output of nload, I only get 500kbit/s whenever one machine is booting. The machines are connected via a GBit switch, so that can't be it. Also, when testing the connection speed to the outside, I have the full bandwidth available. Is VBox just unable to deal with large amounts of UDP packets? Can anyone point me in the right direction here?

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• VPN Split Tunneling - Pros and Cons and how to achieve?

  - by Theveloper

  Well this is the dilemma, I want remote clients to connect to my network and only route local access through the VPN. This is split tunneling, the client uses its internet connection for all other internet requests and the VPN tunnel to my network for local requests. There's a couple of issues that arise: split tunneling in Windows is achieved by unticking an option which reads "Use default gateway on remote network" in the TCP/IP settings of the client VPN connection. At any point the user can tick it and route all his internet traffic through my network eating away at my bandwidth and being cloaked by my IP address. This is unacceptable. Issue number 2 is that if the client is split tunneling, he becomes a gateway between the internet and my network, this is also unacceptable. My questions are: how does one achieve split tunneling serverside? And is the latter issue a valid con worthy of worry? Any thoughts would be appreciated!

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• Disable Memory Modules In BIOS for Testing Purposes (Optimize Nehalem/Gulftown Memory Performance)

  - by Bob

  I recently acquired an HP Z800 with two Intel Xeon X5650 (Gulftown) 6 core processors. The person that configured the system chose 16GB (8 x 2GB DDR3-1333). I'm assuming this person was unaware these processors have 3 memory channels and to optimize memory performance one should choose memory in multiples of three. Based on this information, I have a question: By entering the BIOS, can I disable the bank on each processor that has the single memory module? If so, will this have any adverse effects or behave differently than physically removing the modules? I ask due to the fact that I prefer to store the extra memory in the system if it truly behaves as if the memory is not even there. Also, I see this as an opportunity to test 12GB vs. 16GB to see if there is a noticeable difference. Note: According to http://www.delltechcenter.com/page/04-08-2009+-+Nehalem+and+Memory+Configurations?t=anon, the current configuration reduces the overall data transfer speed to 1066 and in addition, the memory bandwidth goes down by about 23%.

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• Disk Redundancy across different server

  - by Mascarpone

  I have 3 servers, all with the same specs: Intel CPU 8 GB RAM Linux or BSD Single 2TB desktop SATA with more than 10K Hours of operation, with only less than 300 GB Used My provider cannot install a second hard drive, but can guarantee me that the drive will be replaced immediately in case of failure, with another equally crappy drive. The likelihood of drive failure is high, and since I can't use RAID, I was thinking about keeping a back up of each machine on all the other machines, so that there are always 2 copies on 2 different drives, plus the original. I would synchronize the drives every hour, with rsync, to guarantee some sort of redundancy, since bandwidth inside the DC is free, so it would be much cheaper than offsite backup. (A daily offiste backup is kept anyhow). What do you think? Any suggestion?

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• Simple SQL Server 2005 Replication - "D-1" server used for heavy queries/reports

  - by Ricardo Pardini

  Hello. We have two SQL 2005 machines. One is used for production data, and the other is used for running queries/reports. Every night, the production machine dumps (backups) it's database to disk, and the other one restores it. This is called the D-1 process. I think there must be a more efficient way of doing this, since SQL 2005 has many forms of replication. Some requirements: 1) No need for instant replication, there can be (some) delay 2) All changes (including schemas, data, constraints, indexes) need to be replicated without manual intervention 3) It is used for a single database only 4) There is a third server available if needed 5) There is high bandwidth (gigabit ethernet) available between the servers 6) There isn't a shared storage (SAN) available What would be a good alternative to this daily backup/restore routine? Thanks!

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