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  • Regarding traffic shaping on juniper SRX550

    - by peilin
    We have implemented the Juniper SRX550 in our company. Now we have one issue that how to restrict the internal user download speed from internet. Take one example that i want to restrict the end user with IP:192.168.1.20/32 downloading speed up to 1M via my external port ge-0/0/6.0. Below is my setting: [edit firewall policer p1M] root@SRX550# show if-exceeding { bandwidth-limit 1m; burst-size-limit 15k; } then discard; [edit firewall family inet] root@SRX550# show filter limit-user term 10 { from { destination-address { 192.168.1.20/32; } } then policer p1M; } term else { then accept; } [edit interfaces ge-0/0/6] root@SRX550# show per-unit-scheduler; unit 0 { family inet { filter { input limit-user; } address Hidden Here; } } As per the setting, the end user downloading speed should not exceed the 1m (125KB in windows), but the result is the downloading speed for this end users still can up to 400KB via HTTP/HTTPS. Please advise. Thanks.

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  • CMS/Wiki to use for a HTML5 video site

    - by Clinton Blackmore
    Greetings. I want to put up a website with instructive screencasts, and allow for people to add comments to them. I would like use the Video for Everybody technique, partly because I dislike Flash and because it helps in a small way to move the web forward [while being backwards compatable]. I recognize that HTML5 is still in draft, and that support for it varies. I do have some hosting space, and can run Perl, PHP, and Ruby on Rails applications, with a MySQL backend. I should mention that part of my working job involves running some web servers, and that I am a programmer by training (with only a limited familiarity with Perl and PHP, and none with Ruby). I should mention why I don't particularly want to go with a video hosting site (like YouTube or Vimeo): Flash Video Resolution and Quality [I'd like to put up 800x600 videos] Videos promote a club that is not stricly non-profit [ie. may fall afoul of Terms of Service] I'm already paying for web hosting, and free video hosting comes with time and bandwidth limits I don't want there to be two locations where you can comment on the video Now, having said all that, I'd be quite comfortable putting up my own HTML pages, except: that's so web 1.0! :) [ie. it does not allow for comments] I also want to do some blogging and possibly put up a wiki; the site will not be entirely screencasts So, can anyone recommend a CMS (or Wiki, or similar application) that I can customise for this purpose?

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  • How can I split 200Mbps of streaming traffic into routers?

    - by Jared
    As the title says, I have 200Mbps of streaming video traffic coming into my command center. How do I split the load between routers? Setup is like this: fiber --- router --- switch --- workstations I'm sorry I haven't dealt with this much traffic before. so please be gentle if you're going to kick me out :) EDITED FOR DETAILS: Okay, this specific project is for our company's IP CCTV system. We have deployed over 100++ cameras all over a building/campus and we have estimated each camera to take about 2Mbps of bandwidth each. Now, they're all connected to a switch and that's entirely fine. But coming into our command center, they have to be on a router since it'll get more than 200++ cameras next year (and I don't want to have too many hosts on one subnet). My plan was to have the 1st hundred on a 172.16.9.x block and the 2nd hundred on a 172.16.10.x block (all /24). The servers I have are currently sized to match (about 5 dual 6-core xeons) and I'd have about 19 workstations all streaming video from the 5 servers. (servers pull video from the cameras). But 200Mbps of constant traffic? How the hell do I even break this up? I need to have 1 gateway, to manage the routes... I honestly think I'm way in over my head.

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  • why is rdiff-backup not compatible with encfs ---reverse

    - by user330273
    I'm trying to use encfs with rdiff-backup to ensure that my backups to a remote server are encrypted. The easiest way to do this would be to use encfs --reverse - which means encfs will create a virtual encrypted file system, which I can then backup using rdiff-backup. Except that it doesn't work. Rdiff-backup fails every time with an "input/output error" on the encfs virtual filesystem. It seems I'm not the only one with this problem, but no one has said what the problem is: this person reported the same issue, but was just told to use sshfs instead (see below on that); in this question on serverfault, one of the answers just states that "rdiff-backup seems to have trouble accessing the EncFS-reverse filesystem." There's an open bug report on the Debian bug tracker(bug 731413, I can't post the link) on this bug, but it's been open since December 2013 with no response. Does anyone know what the problem actually is? Is there a workaround? I can't use the two most commonly suggested alternatives - sshfs and then running encfs on that, or using Duplicity - as both require a much higher bandwidth connection than I have access to (Duplicity requires regular full backups).

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  • I am under DDoS. What can I do?

    - by Falcon Momot
    This is a Canonical Question about DoS and DDoS mitigation. I found a massive traffic spike on a website that I host today; I am getting thousands of connections a second and I see I'm using all 100Mbps of my available bandwidth. Nobody can access my site because all the requests time out, and I can't even log into the server because SSH times out too! This has happened a couple times before, and each time it's lasted a couple hours and gone away on its own. Occasionally, my website has another distinct but related problem: my server's load average (which is usually around .25) rockets up to 20 or more and nobody can access my site just the same as the other case. It also goes away after a few hours. Restarting my server doesn't help; what can I do to make my site accessible again, and what is happening? Relatedly, I found once that for a day or two, every time I started my service, it got a connection from a particular IP address and then crashed. As soon as I started it up again, this happened again and it crashed again. How is that similar, and what can I do about it?

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  • The bottlenecks of any computer, what to look for?

    - by WebDevHobo
    Whether it is a laptop or a desktop, any computer is made up of several pieces of hardware that communicate with each other. Sending data back and forth to ensure that the user gets the desired results. I have seen some theoretical stuff on computers & hardware, but I wonder how it all comes together. CPU RAM Graphics Card L1 CACHE L2 CACHE L3 CACHE FSB ... And all other things. Which is the biggest bottle neck? Why would a person not want/need a big value in one of those categories in certain situations? P.S.: when reading the specs of the i5 750 processor, I came across this description: In place of the FSB, one or more high speed, point-to-point buses called Quick Path Interconnect (QPI) are used, formerly known as Common Serial Interconnect Bus or CSI. QPI features higher bandwidth than the traditional FSB and is better suited to system scaling. What is this, and how does it compare to FSB? EDIT: I am not planning to buy a computer at all. The goal of this question is to understand the internal relation of various hardware pieces, their specific functions and how they work together. For instance, I have heard to a somewhat higher-than-usual amount of L2/L3 Cache can help speed up your computer. What's up with saying that? Also I forgot to mention Hard-disk RPM.

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  • Throughput; capacity planning help for C10K like design

    - by z8000
    I am designing a network service in which clients connect and stay connected -- the model is not far off from IRC less the s2s connections. I could use some help understanding how to do capacity planning, in particular with the system resource costs associated with handling messages from/to clients. There's an article that tried to get 1 million clients connected to the same server [1]. Of course, most of these clients were completely idle in the test. If the clients sent a message every 5 seconds or so the system would surely be brought to its knees. But... How do you do less hand-waving and you know, measure such a breaking point? We're talking about messages being sent by a client over a TCP socket, into the kernel, and read by an application. The data is shuffled around in memory from one buffer to another. Do I need to consider memory throughput ("5 GT/s" [2], etc.)? I'm pretty sure I have the ability to measure the basic memory requirements due to TCP/IP buffers, expected bandwidth, and CPU resources required to process messages. I'm a little dim on what I'm calling "thoughput". Help! Also, does anyone really do this? Or, do most people sort of hand-wave and see what the real world offers, and then react appropriately? [1] http://www.metabrew.com/article/a-million-user-comet-application-with-mochiweb-part-3/ [2] http://en.wikipedia.org/wiki/GT/s

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  • ESX 4.0 space: DASD, NAS, or ?

    - by thormj
    I put together an ESX box for better management, but its performance is a WTF item; I'm a noob at dealing with ESX, so I'm looking for a laundry-list of reading material to help me straighten this out so I can go back to .NET programming. Current storage system: We're running Raid5+Hotspare (8x500 GB spindles) on a PERC6i on a Dell 2910. Due to ESX limitatios, the PERC is showing the storage as 1x2TB + 1x800GB "partitions." I'm not sure of the setup's configuration (stride / stripe / ???) at all. Our Applications We have a SBS server as well as a minor (2x50 GB, but growing at 10GB/month) database server... Our application that lives on the database VM is CPU and I/O insense; it's a database churning excercise mixed in with a lot of computation on the data (fixing that performance is what I'm supposed to be working on)... Perfomance Issue When I do a backup, restore, or worse (copy a backup from 1 vm to another to move it to the QA VM), the entire system slows to a crawl (even "unrelated" VMs). I originally thought a DASD situation would be quite good since you had PCI-x bandwidth, but the systemwide slowdown is killing productivity. Questions What should I do to make an intelligent decision about NAS vs RAID vs SAN vs DASD? Are there sweet spots/ugly spots in the storage setup? Can you use a SSD PCI-X card in ESX for the tempdb? Good/Bad idea? Is there any way to "share" some image in a copy-on-write fashion? Most of the "Backup-Copy-Restore" is to "put a clean image on the dev boxes"; if I could have them "share" the master image, the "big copy" (2x50 GB) would only need to be done once per week instead of once per dev per week...[runtime performance isn't a concern with the dev boxes, but the backup/copy/restore kills production, SBS, and everything else on the box]

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  • Why do I often have to refresh pages I navigate to once for them (or content in them) to load?

    - by GetOutOfBox
    I have noticed a bizarre pattern when using my PC, that when I open a link to a website, it often will often take a very long time to load, or time out. Sometimes content on the website will be drawn, but again, it seems to get "stuck" for an unusual amount of time before finishing. Most affected is Youtube; almost every time I navigate to a youtube video from another website such as Google, the video will not begin playing, but will instead just display the player controls with a black screen where the video should be and the buffering symbol, usually before displaying an error such as "The video failed to load". The unusual part of this problem is that whenever this happens, refreshing the page always causes it to load almost immediately the second time around, without any problems. Note that I'm not talking about how some browsers will dump whatever has been cached to the "pallet" briefly when the page is refreshed or loading stopped; but that the second time loading the website being faster. I have done my best to rule out some of the obvious causes: My Windows 7 desktop computer is the only device that seems to be affected. I use Firefox on it (latest version, flash updated, etc). My connection has more than enough bandwidth (30 megabits down, 4 up), and I've even tried QoSing all other devices to make sure this isn't happening due to usage spikes. Wireshark is not showing any clearly unusual network activity (i.e frequently dropped packets).

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  • Why do clients on Branch Sites insist on accessing SYSVOL on the HQ DC instead of the branches' RODC?

    - by pepoluan
    I'm still scratching my head over this situation... You see, we have 3 RW DCs in the HQ, and 1 RODC on every branch sites (50+ locations). During startup, a script will pull in some files from \\example.com\SYSVOL\example.com\Common\Data But we have been experiencing bandwidth overload. A traffic analysis indicated that lots of clients in the Branch Sites were trying to access the SYSVOL located in the RW DCs. E.g.: If the RW DCs are 10.1.0.15, 10.2.0.15, and 10.3.0.15, and site 'X' has a subnet of 10.27.0.0/16 (with its RODC at 10.27.0.15), clients at site 'X' seem to insist on accessing \\10.1.0.15\SYSVOL or \\10.2.0.15\SYSVOL or \\10.3.0.15\SYSVOL; they seem to be ignoring the RODC completely. What is going on here? Where should I start investigating what went wrong? BTW, I'm already using DFS-R, and replication have been going on successfully; I can put a small 'canary' file on one of the RW DCs, and within minutes all the RODCs will have successfully replicated the 'canary' file.

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  • Distributed File Systems.

    - by GruffTech
    So, I've been reading several articles around ServerFault as well as google. (For Example, this link) My Requirements are very similar to the link above, however i'd like to also have dynamic or at least resizeable file volumes, so if necessary i can add 4-5 servers to the pool, and then expand the volume. Any Distributed File systems that support that, to save me some time? Thanks! LustreFS will be my next test cluster to build. GlusterFS I've build a 3-machine test GlusterFS cluster, However i quickly became aware of several of its limitations that it doesn't seem to make clearly public. One, i can't seem to resize a volume. Once a volume is created, its done. Which seems retarded, why have a fully scalable file system if i can't scale a volume? So maybe i'm doing something wrong. I'm not sure. AmazonS3 while gives the cheapest startup adds too much cost when broken down to per client per month, so its out. Building my own system when prorated over several years with no bandwidth costs makes it significantly cheaper. MogileFS isn't an option as we'd like this server to be a SAN-Replacement, for storing tons of media from a multitude of systems, which for us means it needs to be POSIX compliant so it can be remotely mounted via NFS or CIFS.

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  • Dos/ Flood Lag even though Port not Saturated

    - by Asad Moeen
    My GameServers had been under some UDP Floods due to which they generated outputs to the attacker which gave the GameServers some huge lags. Thanks to friends at ServerFault that upon different kind of testing, I was able to successfully block the attack. My question is actually something else but it is important to know how the GameServers reacted to the attack and if the machine kept stable or not: 300kb/s Input would cause GameServer to generate 2mb/s Output. So as the Input Rate kept increasing, output rate would reach so high that it would no longer be possible for the GameServer to control it and hence it would give a huge Lag until the attack is stopped. Usually the game server starts to lag when it sends out something greater than 5mb/s and under that is controllable. Theoretically, I was able to receive a 60mb/s output from my GameServer on inputting 10mb/s. Its just the way the GameServer works if not protected. Now on some of my machines, only the GameServer under attack lagged and although the server was generating 60mb/s output, rest of the gameservers on other ports would run fine without lags on the same machine. But there was another machine which also runs on a 100 MBPS Network port, even 1 mbps input ( and ZERO output because attack is blocked ) even on an unused port would give a constant yellow line ( on the Lag-o-Meter ) to all the clients on all GameServers indicating lag because that line is actually blue under normal conditions. It would remain the same even on 50mbps or 900mbps input. I tried contacting the host about it because I believe its the way their Network is bridged, but they can't help me about it. Anyone else knowing about such issues because if 900mbps input does not Saturate the port, how can 1mbps input lag the servers although port is not saturated and enough bandwidth is available?

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  • Different network response for indentical co-located machines

    - by Santosh
    We have a situation as follows: We have a two different virtual machines (VMs) on some remote server farm. The machines are identical in terms of hardware/software(OS) configurations. We have a J2EE application running on JBoss on each of those two machines. These two applications are of different version sav V1 on VM1 and V2 on VM2. We observed some degraded response time for application V2 when accessed via public URL. When we accessed the application through a secured VPN, there is hardly any difference. The bandwidth test (upload/download speed, ping etc) shows that VM1 is responding better when accessed via secured VPN. We concluded that the application does not seem to have performance issue. Because, it that's the case the performance degradation should also be there when access via VPN. So we concluded its the network problem. But since those two identical VMs are on same network we are looking for the reasons for different responses. My question is, given the above situation, what could be reasons for such a behavior ?

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  • Problems using wondershaper on KVM guest

    - by Daniele Testa
    I am trying to limit bandwidth on one of my KVM guest using Wondershaper. Doing something like this works fine: wondershaper br23 9000 9000 Doing a wget with the setting above gives a download speed of about 1MB/sec like it should. However, it seems this is the highest setting I can use, because setting it to this does not work: wondershaper br23 10000 10000 Doing the same wget with the setting above downloads with full speed, about 70MB/sec in my case. Running a status-check returns the following: qdisc cbq 1: root refcnt 2 rate 10000Kbit (bounded,isolated) prio no-transmit Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 borrowed 0 overactions 0 avgidle 12500 undertime 0 qdisc sfq 10: parent 1:10 limit 127p quantum 1514b divisor 1024 perturb 10sec Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 qdisc sfq 20: parent 1:20 limit 127p quantum 1514b divisor 1024 perturb 10sec Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 qdisc sfq 30: parent 1:30 limit 127p quantum 1514b divisor 1024 perturb 10sec Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 qdisc ingress ffff: parent ffff:fff1 ---------------- Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 class cbq 1: root rate 10000Kbit (bounded,isolated) prio no-transmit Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 borrowed 0 overactions 0 avgidle 12500 undertime 0 class cbq 1:1 parent 1: rate 10000Kbit (bounded,isolated) prio 5 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 borrowed 0 overactions 0 avgidle 12500 undertime 0 class cbq 1:10 parent 1:1 leaf 10: rate 10000Kbit prio 1 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 borrowed 0 overactions 0 avgidle 12500 undertime 0 class cbq 1:20 parent 1:1 leaf 20: rate 9000Kbit prio 2 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 borrowed 0 overactions 0 avgidle 12500 undertime 0 class cbq 1:30 parent 1:1 leaf 30: rate 8000Kbit prio 2 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 borrowed 0 overactions 0 avgidle 12500 undertime 0 What am I doing wrong? Does wondershaper have some kind of upper limit?

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  • Managing multiple Apache proxies simultaneously (mod_proxy_balancer)

    - by Hank
    The frontend of my web application is formed by currently two Apache reverse proxies, using mod_proxy_balancer to distribute traffic over a number of backend application servers. Both frontend reverse proxies, running on separate hosts, are accessible from the internet. DNS round robin distributes traffic over both. In the future, the number of reverse proxies is likely to grow, since the webapplication is very bandwidth-heavy. My question is: how do I keep the state of both reverse balancers / proxies in sync? For example, for maintenance purposes, I might want to reduce the load on one of the backend appservers. Currently I can do that by accessing the Balancer-Manager web form on each proxy, and change the distribution rules. But I have to do that on each proxy manually and make sure I enter the same stuff. Is it possible to "link" multiple instances of mod_proxy_balancer? Or is there a tool out there that connects to a number of instances, and updates all with the same information? Update: The tool should retrieve the runtime status and make runtime changes, just like the existing Balancer-Manager, only for a number of proxies - not just for one. Modification of configuration files is not what I'm interested in (as there are plenty tools for that).

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  • Xen PV packet loss

    - by Delphinator
    I'm having some serious issues with packetloss with one of my servers. This server is a somewhat old (P4-era) machine running Debian Squeeze and Xen 4.0. There are two domUs running on it (both also Debian Squeeze), one gateway and a fileserver. Unfortunatly the processor has no virtualization extensions, therefore only PV can be used. While investigating why our network seems to be slower than it should I found some pretty bad packet loss (~25%). After further investigation and several experiments I did a measurment between the dom0 and one of the domUs: Server listening on UDP port 5001 Receiving 1470 byte datagrams UDP buffer size: 110 KByte (default) ------------------------------------------------------------ ------------------------------------------------------------ Client connecting to dom0, UDP port 5001 Sending 1470 byte datagrams UDP buffer size: 110 KByte (default) ------------------------------------------------------------ [ 3] local 192.168.1.2(domU) port 33817 connected with 192.168.1.100(dom0) port 5001 [ 4] local 192.168.1.2(domU) port 5001 connected with 192.168.1.100(dom0) port 48606 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 46.3 MBytes 38.7 Mbits/sec [ 3] Sent 33020 datagrams [ 3] Server Report: [ 3] 0.0-10.0 sec 46.2 MBytes 38.6 Mbits/sec 0.030 ms 89/33019 (0.27%) [ 3] 0.0-10.0 sec 1 datagrams received out-of-order [ 4] 0.0-10.2 sec 43.0 MBytes 35.3 Mbits/sec 13.074 ms 11575/42256 (27%) tl;dr: 27% packet loss from dom0 to domU with 50Mbit UDP packets. Same thing happens from anywhere in the network. The problem gets better for smaller bandwidths (0.047% for 5Mbit) and worse for higher (59% for 200Mbit) ones. I did increase the CPU-weight of the dom0, there is no swapping going on, and actual networking-hardware is not involved. I never expected Xen (or anything related) to drop packets, and I'm completly clueless what to try next.

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  • Offline copies in Windows file sharing

    - by netvope
    I frequently access media files (music or video) on a remote Windows file share. My Internet connection is not very fast, and I find it a waste of bandwidth when I repeatedly access the same files. For example, I may listen to the same song 30 times in a month. So, I would like to cache files I've used. I know Windows has an "Always available offline" feature but I think it doesn't suit my needs. I don't want to make the whole share "available offline" as the remote Windows file share is huge (in terabytes). Making individual files "available offline" is tedious as the files are scattered in many different directories. It would be much more convenient if I can simply cache those I've used. Also The files on the share seldom change. Many of the files are rarely used. Some of the files are frequently used. I don't have a list of the most frequently used files. So I think the best way is to have a caching proxy for the Windows share. What do you think? I have a Linux box sitting around. Perhaps I should try to setup samba4?

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  • Offline cache copies in Windows file sharing

    - by netvope
    I frequently access media files (music or video) on a remote Windows file share. My Internet connection is not very fast, and I find it a waste of bandwidth when I repeatedly access the same files. For example, I may listen to the same song 30 times in a month. So, I would like to cache files I've used. I know Windows has an "Always available offline" feature but I dont' think it suit my needs. I don't want to make the whole share "available offline" as the remote Windows file share is huge (in terabytes). Making individual files "available offline" is tedious as the files are scattered in many different directories. It would be much more convenient if the system can simply cache those I've used. I could also manually make a local copy each time I use a file... but this is even more troublesome than making each file "available offline" Also The files on the share seldom change. Many of the files are rarely used. Some of the files are frequently used. I don't have a list of the most frequently used files. It would be the best if I could tell Windows to cache the last accessed 10GB, but apparently it doesn't have this feature. So I think the best way is to have a SMB/CIFS caching proxy. What do you think? I have a Linux box sitting around. Perhaps I should try to setup samba4?

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  • Best way to attach 96 tb to workstation

    - by user994179
    I'm running a workstation with dual xeon 5690's (12 physical/24 logical cores), 192 gb of ram (ie, maxed-out), Windows 7 64bit, 5 slots for adapter cards, and 1 tb of internal storage, with 5 more internal bays available. I have an app that creates data files totaling about 88 tbs. These are written once every 14 months, and the rest of the time the app only needs to read them; and 95% of the reads are sequential reads of huge chunks of data. I have some control over how big the individual files are, but ideally they would be between 5 and 8 tbs. The app will be reading from only one drive at a time, and the nature of the data is such that if (when) a drive dies I can restore the data to a new disk from tape. While it would be nice to be able to use the fastest drive/controllers available, at this point size matters more than speed. After doing lots of reading, I am leaning toward buying a bunch of cheap 2tb drives and putting them into a bunch of cheap enclosures. All this stuff is going into my home office, so I need to avoid the raised floor/refrigerated approach. My questions: Is the cheap drive/enclosure solution the best one for this situation? Given the nature of the app and the way the data is used, does RAID make sense? If so, which one? For huge sequential reads, would Usb 3.0 and eSata be a wash performance-wise? For each slot available on the workstation, can I hook up an enclosure that can hold multiple drives? Or is it one controller per drive? If I can have multiple drives on one controller, am I essentially splitting the bandwidth (throughput)? For example, if I have a 12 bay enclosure, is the throughput of the controller reduced by a factor of 12? Are there any Windows 7 volume/drive/capacity limits I should be aware of? Thanks

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  • Virtual Fileserver

    - by Sergei
    Hi, We are planning to move our production servers to the datacenter and virtualize remaining servers in the process.Datacenter will have HP blades with vSphere on top.Currentliy we are using Celerra NS20 as fileserver.Since datacenter is using HP kit and EVA 4400 as SAN, we cannot have Celerra there, as EMC supoprt for Celerra does not work for non EMC array. I have searched for possible options and one of them was to have HP NAS blade X3800sb instead of Celerra.However this seems like overkill for me.We are only using Celerra for about 100 users and 50 servers and I think having X3800sb could be waste of resources. The other option would be to have a virtual fileserver as a part of vmware environment in datacenter.We only need CIFS to be provided.The only option I can think of is Windows Storage server.We had a bad expirience with Windows servers used as fileservers ( memory leaks one thing) in the past and this was one of the reasons we moved to Celerra. What are the other options?We need something as reliable as Celerra with as many options as possible.For example , Celerra has per folder quotas, deduplication, dynamic volume allocation, automatic failover, VTLU, replication. Also we would need to replicate NAS data to the failover site.We could use block level replication , SAN-to-SAN, but this would mean wasted bandwidth, as we need only subset of folders to be replicated.We used CA XSoft for windows servers in the past and Celerra has option for Celerra replication. Thank you very much in advance, Please ask me if I missed any details!

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  • How To Find Reasons of Why Site Goes Online/Offline

    - by HollerTrain
    Seems today a website I manage has been going online and offline throughout the entire day. I have no idea what is causing the issue so I am seeking guidance on where to start. It is a Wordpress based site. So here is what I DO know: I use a program that pings the server every minute and when the server is not responding me it emails me, so I can know exactly when the site is online and offline. The site between 8pm to 12pm 12.28, and around the 1a hour early morning 12.29 (New York City timezone, and all times below are in same timezone). At the time of the ups/downs I see a lot of strain on the memory usage. Look at the load average when the site is going online/offline (http://screencast.com/t/BRlfXkqrbJII). Then I ran this command to restart http (http://screencast.com/t/usVtYWZ2Qi) and the memory usage then goes down to this (http://screencast.com/t/VdTIy3bgZiQB). An hour after I restarted http, the site then went offline/online so restarting the http didn't do much help. When the site is going offline/online, I ran the top command and get this (http://screencast.com/t/zEwr7YQj3). Here is a top command when the site is at it's lowest (http://screencast.com/t/eaMfha9lbT - so this would be dubbged "normal"). Here is a bandwidth report (http://screencast.com/t/AS0h2CH1Gypq). The traffic doesn't seem to be that much (http://screencast.com/t/s7hrWNNic1K), but looking at my times the site is going up/down this may be one of the reasons? I have the dvp Nitro package at Media Temple (http://mediatemple.net/webhosting/nitro/). So at this point I would request some help in trying to figure out what the cause of this is, and how I can go about pinpointing this issue. ANY HELP is greatly appreciated.

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  • How to Load Balance 2 Internet Connections on a Windows 7 machine?

    - by Jimmy Chandra
    It's sort of related to this particular question, but that one is on Mac. I am looking for similar solution on Windows 7. I have 2 network connections: (Connection A) Wireless terminal connecting to ISP A (3G / EVDO internet provider) (Connection B) Broadband wired connection connecting to ISP B (Cable internet provider) Both has access to the internet. When I try connecting to a website and checking the networking tab on my Task Manager, I only see the network traffic being routed to only Connection A. Is there a way to make the computer to utilize both network (in a sense using all the bandwidth available from both the Cable ISP and the 3G / EVDO ISP) at the same time? If so, what do I need to do to set this up ... on Windows 7? Here is a bit more info on my network connections (ipconfig /all): PPP adapter Wireless Terminal: IPv4: aa.bb.ccc.ddd(preferred) Subnet mask: 255.255.255.255 Default Gateway: 0.0.0.0 DNS: aa.ee.f.ggg aa.ee.f.hhh Primary Wins: jjj.ii.k.l Secondary Wins: jjj.ii.k.m Ethernet adapter LAN: IPv4: 192.168.1.100 (connected to a router by wired that itself connect to a cable modem) subnet mask: 255.255.255.0 Default gateway: 192.168.1.1 (the wireless router) DHCP: 192.168.1.1 (the wireless router) DNS: xxx.yy.zz.ww rr.sss.t.uuu For my own privacy, I don't believe the actual number matters, the patterns are representative of the ip numbering scheme...

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  • Feasibility of Windows Server 2008 DFS replication over WAN link

    - by CesarGon
    We have just set up a WAN link that connects two buildings in our organisation. The link is provided by a 100-Mbps point to point line. We have a Windows Server 2008 R2 domain controller on each side of the link. Now we are planning to set up DFS for file services across the organisation. The estimated data volume is over 2 TB, and will grow at approximately 20% annually. My idea is to set up a file server in each building and install DFS so that all the contents stay replicated over the 100-Mbps link. I hope that this will ensure that any user will be directed to the closest (and fastest) server when requesting a file from the DFS folders. My concern is whether a 100-Mbps WAN link is good enough to guarantee DFS replication. I've no experience with DFS, so any solid advice is welcome. The line is reliable (i.e. it doesn't crash often) and our data transfer tests show that a 5 MB/sec transfer rate is easily achieved. This is approximately 40% of the nominal bandwidth. I am also concerned about the latency. I mean, how long will users need to wait to see one change on one side of the link after the change has been made on the other side. My questions are: Is this link between networks a reliable infrastructure on which to set up DFS replication? What latency times would be typical (seconds, minutes, hours, days)? Would you recommend that we go for DFS in this scenario, or is there a better alternative? Many thanks.

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  • Traffic shaping on Linux with HTB: weird results

    - by DADGAD
    I'm trying to have some simple bandwidth throttling set up on a Linux server and I'm running into what seems to be very weird stuff despite a seemingly trivial config. I want to shape traffic coming to a specific client IP (10.41.240.240) to a hard maximum of 75Kbit/s. Here's how I set up the shaping: # tc qdisc add dev eth1 root handle 1: htb default 1 r2q 1 # tc class add dev eth1 parent 1: classid 1:1 htb rate 75Kbit # tc class add dev eth1 parent 1:1 classid 1:10 htb rate 75kbit # tc filter add dev eth1 parent 1:0 protocol ip prio 1 u32 match ip dst 10.41.240.240 flowid 1:10 To test, I start a file download over HTTP from the said client machine and measure the resulting speed by looking at Kb/s in Firefox. Now, the behaviour is rather puzzling: the DL starts at about 10Kbyte/s and proceeds to pick up speed until it stabilizes at about 75Kbytes/s (Kilobytes, not Kilobits as configured!). Then, If I start several parallel downloads of that very same file, each download stabilizes at about 45Kbytes/s; the combined speed of those downloads thus greatly exceeds the configured maximum. Here's what I get when probing tc for debug info [root@kup-gw-02 /]# tc -s qdisc show dev eth1 qdisc htb 1: r2q 1 default 1 direct_packets_stat 1 Sent 17475717 bytes 1334 pkt (dropped 0, overlimits 2782 requeues 0) rate 0bit 0pps backlog 0b 12p requeues 0 [root@kup-gw-02 /]# tc -s class show dev eth1 class htb 1:1 root rate 75000bit ceil 75000bit burst 1608b cburst 1608b Sent 14369397 bytes 1124 pkt (dropped 0, overlimits 0 requeues 0) rate 577896bit 5pps backlog 0b 0p requeues 0 lended: 1 borrowed: 0 giants: 1938 tokens: -205561 ctokens: -205561 class htb 1:10 parent 1:1 prio 0 **rate 75000bit ceil 75000bit** burst 1608b cburst 1608b Sent 14529077 bytes 1134 pkt (dropped 0, overlimits 0 requeues 0) **rate 589888bit** 5pps backlog 0b 11p requeues 0 lended: 1123 borrowed: 0 giants: 1938 tokens: -205561 ctokens: -205561 What I can't for the life of me understand is this: how come I get a "rate 589888bit 5pps" with a config of "rate 75000bit ceil 75000bit"? Why does the effective rate get so much higher than the configured rate? What am I doing wrong? Why is it behaving the way it is? Please help, I'm stumped. Thanks guys.

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  • 2 subnets off of 1 PC with 2 NICs

    - by Jeff
    I have a general setup I'd like to do with some IP cameras. This seems like it will work but I think I may be missing something. Our system consists of a video recorder PC connected to a switch which is connected to a number of IP cameras. I'd like to connect this system into an existing network but I want it on a different subnet. The main reason is that the cameras use a lot of bandwidth that I don't want slowing down the existing network. My idea was to install 2 NICs on the video recorder pc. 1 NIC connects to the existing network on 192.169.1.x for example, and the other NIC connect to the switch with the cameras. This NIC would be 192.168.100.x. Then we could remote to the video recorder PC with a GoToMyPC type thing for administration via the existing network. I've included a diagram of how I see this working but I'm a little fuzzy on the setup of the NICs (if this can work at all). My problem may be trying to deal with 2 subnets without a router but It really doesn't seem like it's necessary in this situation. BTW, gliffy is cool.

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