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• Is it possible to use the MMM tool without virtual IP capability?

  - by Artem

  We are on a host (Serverbeach) that does not support Virtual/floating IPs until you reserve at least a half-rack, which is just a little more than we are willing to spend per month right now. We do have 2 machines in one of their datacenters, and I am using these 2 machines right now in the Master-Master in Active-Passive Mode just like done by MMM -- http://mysql-mmm.org/. I have just set them up and I managing them manually, with manual switch on the Web frontend to tell it to connect to the correct (active) master. Is there any way to use MMM without virtual IPs? Any other comments on this setup?

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• W2k8 RC1: Windows Media Servers (WMS) as proxy

  - by da_didi

  (fullquote from stackoverflow.com/questions/2690788/w2k8-rc1-windows-media-servers-wms-as-proxy/2690791#2690791) I will have one streaming-server (W2k8, unknown streaming protocol [rtsp, mss, http]) and half dozen streaming-servers as proxies to save bandwidth. I have read the documentation and installed the modules, but I am unsure how I have to configure the proxy's according to http://technet.microsoft.com/de-de/library/ee126142(en-us,WS.10).aspx - as a proxy or reverse proxy and how I minimize the bandwidth needs between origin server and proxy's. What is the best way to realize my setup? Any short how-tos? How can I announce all players to use the proxy? Route all rtsp/mms/http-requests through my proxy? Announce the proxy with DHCP-releases? Thanks!

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• SLA Violations - Compensation expectations and vague contracts

  - by llllxllll

  Tagging this as cautionary tale. I took over for an admin a year and a half ago, and reviewed the 3 year contract with our ISP. There were no specific SLA promises in the contract that I found, and have been meaning to review the contract with our rep. Of course, we had an outage this past week that resulted in almost four days of downtime !!!!! This involves eff-ups of epic proportions on our ISP's part and a telco they colocate with. Details can be provided. I am the network / systems / purchasing / and helpdesk at my company...and am willing to fight with the ISP. I also have more management that can get involved, including the name on the contract. First, if there are not concrete guarantees about compensation and downtime, we are screwed right? Two, if we want out of our contract, does anyone have experience going the legal route, and if so, who knows a lawyer? =)

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• Replicating/Synchronizng multiple tables across diffrent Databases on the same instance

  - by Idan

  I have few tables that needed to be replicated/synchronized across several databases in our SQL Server 2008 cluster. I know it's possible to replicate between multiple instances, but I'm looking for replication or synchronization in the same instance between specific tables of databases. The replicaiton/synchronization should happen every half-hour or so, but I don't mind it happening constantly. I can't use DROP the target table and INSERT (copy) the source table since there are many constraints. Reason for this is to not manage in the application layer and write to 2 different databases at the same time. Example: DB1 has T1, T2 and T3 - these are constantly being updated by the application, APP1 running on DB1. DB2 needs to have an updated copy of T1 at all times, also, there is a different application, APP2 runs only on DB2. Both DB1 and DB2 are located on the same instance, INST1. Would it be possible to replicate T1, T2 and T3 from DB1 to DB2 ? Thanks, Idan.

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• Any good software to help me memorize passwords?

  - by Septagram

  I'm using KeePass(X) and other tools to keep most of my passwords. However, it turns out, there is still about half a dozen passwords I'm using on regular basis that I would prefer to just remember. So, do you people know of any good programs, preferably open-source, to train yourself using a particular password and thus to memorize it? I know I can remember a 96-bit entropy password rather well if I practice entering it 3 days, 5 minutes for each day, I just want a good software to simplify the process and exclude the possibility of shouldering or otherwise leaking the password.

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• CPU load, USB connection vs. NIC

  - by T.J. Crowder

  In general, and understanding the answer may vary by manufacturer and model (and driver, and...), in consumer-grade workstations with integrated NICs, does the NIC rely on the CPU for a lot of help (as is typically the case with a USB controller, for instance), or is it fairly intelligent and capable on its own (like, say, the typical Firewire controller)? Or is the question too general to answer? (If it matters, you can assume Linux.) Background: I'm looking at connecting a device (digital television capture) that will be delivering ~20-50 Mbit/sec of data to a somewhat under-powered workstation. I can get a USB 2 High-speed device, or a network-attached device, and am interested in avoiding impacting the CPU where possible. Obviously, if it's a 100Mbit NIC, that's roughly half its theoretical inbound bandwidth, whereas it's only roughly a tenth of the 480 Mbit/second the USB 2 "High Speed" interface. But if the latter requires a lot of CPU support and the former doesn't...

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• HP Photosmart 7450 Prints Noise On Windows 7 Pro 64-bit

  - by David Mackintosh

  I have received a working (in its last location) HP Photosmart 7450 printer. I connected it up to my Windows 7 Pro 64-bit workstation, and the driver was (apparently) installed. The problem is that whenever I try to print from it -- test page, text from notepad, picture, whatever -- it spins through a half dozen sheets of paper, some of which have fractions of text on them, but most of which are either blank or have line noise printed on them. Noise similar to what was printed out on ye olde laserjet printers when the postscript interpreter failed. HP's web site only has a "use the included driver in Windows 7, be happy" instruction. The driver has been removed and added several times. The printer was previously attached to a XP Home computer and worked correctly without incident. Does anyone have any ideas for troubleshooting before I drop this printer in the river?

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• nginx is not using gzip to talk to backend servers

  - by Michael Gorsuch

  Our web servers are running IIS 7 and are configured to compress dynamic and static content. When I hit these servers directly, gzip compression works. I recently placed nginx in front of them, and gzip compression has stopped. I was able to work around this by explicitly enabling gzip compression on nginx itself, but that seems a little inefficient considering I have half a dozen backends and only one active nginx box. It appears that nginx is stripping out the Accept-Encoding header. Does anyone have any advice for how to 'correct' this behavior? A sample configuration: upstream backend { server 127.0.0.1:8080; } server { listen 80; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; location / { proxy_pass http://backend; } }

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• Hibernating Ubuntu on EC2 instance?

  - by Dan

  I've got an application I'd like to move to EC2. It will likely spend more than half the day completely dormant, so I'm trying to come up with a good solution for starting and stopping it as needed. It takes a few minutes to start up from nothing, so it would be nice if i could hibernate the OS for quicker resumes. I've seen a couple forum discussions on the topic of hibernation within EC2, but never anything conclusive. Has anyone found a working solution to this, or at least some resources that could help me out?

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• Calculating IOPS for a single HDD - what am I doing wrong?

  - by red888

  So I know there is no standardized way of calculating IOPS for a HDD, but from everything I have read it appears one of the most accurate formulas is the following: IOP/ms = + {rotational latency} + ({block size} / {data transfer rate}) Which is IOs per millisecond or what the book I've been reading calls "Disk Service Time". Also rotational latency is calculated as half of one rotation in milliseconds. This was taken from the EMC book "Information Storage and Management" -arguably a pretty reliable source right\wrong? Putting this formula into practice consider this Seagate data sheet. I am going to calculate IOPS for the ST3000DM001 model for a block size of 4kb: Seek Average (Write) = 9.5 -I'll measuring IOPS for writes Spindle speed = 7200rpm Average Data Rate = 156MB/s So my variables are: Seek Time = 9.5ms Rotational latency = (.5 / (7200rpm / 60)) = 0.004s = 4ms Data Rate = 156MB/s = (0.156MB/ms / 0.004MB) = 39 9.5ms + 4ms + 39 = IO/ms 52.5 1 / (52.5 * 0.001) = 19 IOPS 19 IOPS for this drive clearly is not right so what am I doing wrong?

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• How do I install hiphop-php in CentOS 6?

  - by Dai

  I've been trying to install hiphop-php on CentOS 6 with no luck. I found an .rpm for it but it fails dependency checks on boost which fails to install because it depends on curl which fails to install because it can't overwrite /etc/lib64/libcurl.so.4 I can't remove the current curl version because half the system seems to depend on it. Has anybody had any luck doing this? It's driving me mad. I tried compiling from source but that's even more hellish and I really have no idea what I'm doing anyway.

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• Can't add printer on Windows XP

  - by SuperFurryToad

  I've added a HP 4250 printer to about half a dozen Windows XP PCs in our office without any problems whatsoever, but for some reason I haven't been able to add it to one particular PC today. I go through the Add Printer wizard to add a local printer attached to the PC, enter the new port number as a Standard TCP/IP Port, install the driver. At the end of the wizard I get the following error message: Full error message: "windows cannot connect to the printer. either the printer name was typed incorrectly, or the specified printer has lost its connection to the server." This doesn't make any sense as I am able to ping the printer from the PC. The print spooler is running, and any firewall software on the local PC is switched off.

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• How to fix poor rendering in Windows Movie Maker?

  - by Cyberherbalist

  I am using CamStudio to make some instructional videos about Visual Studio for our development team, and one of the videos needed some editing to remove audio and video mistakes and to add in a better ending. CamStudio outputs to .avi files, and they look pretty good, with the program source code being quite readable. However, after making the edits using WMM, it has rendered the results to a noticeable loss in quality. It has gone from from fairly sharp in focus and adequately readable to recognizable but somewhat blurred. It has also inflated the size of the new .avi file to three times its original size (before cropping half of the vido out!). And the .wmv I attempted to render was was certainly smaller but simply horrible-looking. The left image here is the original video, and the right image is WMM's rendering in .avi format: I have to be doing something wrong, but I know nothing about how to use WMM (my first use of it). I am using default settings to the best of my knowledge. Any suggestions welcomed!

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• Server 2012 R2 DNS Conditional forwarding not working reliably, possible caching issue?

  - by Matt

  I have a bit of a home lab setup with a domain controller that is acting as the DNS server for my network. For everything, it's working fine and forwards external DNS requests to my ISP. The household recently wanted to get Netflix going and it seemed a DNS option was better than a VPN to get around the region locking, so I signed up for unblock-us.com Since I have a Windows DNS server I thought I'd be clever and make use of conditional forwarders and added the Netflix domain to the list. Initially this worked well and all devices on the network could now access Netflix, however after about an hour going to the Netflix site would result in a page cannot be found. Doing an nslookup of Netflix.com from my PC resulted in it not returning any IP addresses. As a test, I deleted the Netflix domain from the DNS servers cache and things started working again - devices could get to the site again however the same thing happens again after around half an hour to an hour. Have I missed something here that's causing it to stop working?

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• HP Proliant DL360 G5 + MSA50 RAID Setup recommendations

  - by JohnRB

  I am running a HP Proliant DL360 2 x 3GHz Xeon 16GB Ram P400 integrated RAID card with 6 x 73GB SAS HDDs running Ubuntu Server 14.04 CLI only. I recently got my hands on a MSA50 SAS Enclosure (10 x SAS HDD bays w/ SAS in/out interface) and wondering what you guys recommended as far as an addon raid controller for one of the pciex slots. I have both slots free Full and Half sizes. Any suggestions are greatly appreciated, I am an I.T. Consultant but have not used these particular units before so I was hoping to hear from someone who has. Thanks!

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• GRUB Error after Deleting Linux Partition

  - by Nironan12

  I was dual-booting with Windows 7 and Windows Vista each taking up half of my hard drive. In Windows 7 I used Easeus Partition Manager to shrink my Windows 7 volume 8GB. On the unallocated space, I installed Linux Mint 8 RC1. After a little bit of playing around with it, I booted in Windows 7, used EPM again and deleted the 8GB Linux partition. I then extended Windows 7 on the 8GB. After restarting my computer, all I get is a black screen and this: GRUB loading. error: no such partition grub rescue> I do not have a Windows 7 disk nor does my computer come with Startup Repair. What do I do?

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• Cheap batteries for old laptop

  - by Jeremy French

  I have an old laptop with a kaput battery. I have looked at this question with regards to spares, but most of the sites that are linked too from there have batteries which probably cost more than the laptop is worth. I like keeping the laptop around as a spare, but find it fustrating that it has to be plugged in permanantly. It seems to be that a half good battery would be acceptable for me, for a knock down price. However nothing of the sort seems to exsist. Is there any way to get cheep batteries in such a case? Laptop is a Compaq Presario 900 if that information helps

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• multi player client server game - polling - wamp

  - by stonebold

  Let's say I make a client-server application. A simple game for example. Where each client polls the server every half a minute. How many clients is it possible to have before it overlaods a wamp server? Basically how robust is Apache for this kind of stuff? Getting a request, aggregating data from mysql server, and then returning the data in an xml format. What solution should I use for my case? Thank you in advance.

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• Photoshop / Illustrator Fill text box with large string.

  - by Xetius

  I have a massive string (lots of Fibonacci numbers concatenated together). I don't know how much of this text I need to fill an A4 page. What I was hoping for was to paste a large block into a text box and have it display as much as possible, wrapping the text at the end of a line, but it is not doing that. It is just displaying a blank box (With the text overflowing into an awaiting textbox or something. I have tried pasting smaller amounts of text into the text box, and it appears that it will get about half way and then go into 'blank' mode. All I need is a simple way of creating a background of numbers which I don't have to type in. Any ideas?

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• Why do partially failed/failing switches fail to pass DHCP?

  - by David Mackintosh

  I've noticed this several times: a switch starts to behave oddly. Usually if the switch doesn't fail outright, what tends to get noticed is that DHCP doesn't work. We had a Linksys SRW-224P fail today. Systems which were still connected worked properly, until it came time to renew their DHCP lease. Once the lease expired, they stopped working, but up until then we couldn't detect a failure. This includes PoE VoIP phones -- they work fine until their lease is up, at which point they're done. I've noticed this on the above-mentioned Linksys, three varieties of 3Com, and possibly half a dozen dumb switches. What is it about DHCP that makes it sensitive to failing switches?

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• FTP - 530 Sorry, the maximum number of clients...?

  - by aSeptik

  Hi All! i know this is not a properly code question, but who of you don't use an FTP client!? ;-) Ok my problem is that my FTP work great, exept when i upload files on a particular client server! on this server happen that some files are uploaded fine and others not, they stop while uploading at half of it's size, then this error is displayed: 530 Sorry, the maximum number of clients (4) from your host are already connected. Unable to make a connection. Please try again. Obviously this is not true, i'm the only one that is uploading! Anyone had the same experience with this!? PS: i have tried many different FTP, all display the same error or just hung up! Thank's

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• How to calculate Bradford Factors with Excel 2007?

  - by pnuts

  Bradford Factors are used by some to measure the significance of absenteeism and are computed for each individual as S squared * D where S is the number of spells (continuous periods of absence) and D is the sum of the days. The calculation is often made over a rolling 52 weeks. Commercial HR software often has the facility to calculate these factors but a Google search indicates quite a lot of interest without any free solutions. Using units of half a day and including any non-working days in each spell, how does one calculate the factors using Excel 2007?

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• Can't connect Alienware M11x wireless to internet thru families router

  - by Jim Kron

  Morning All, Have an Alienware M11x loaded with Win 7 Premium with the Dell half card wifi. Also have a Netgear and Belkin USB external adapters (b/g and N to include dual radios. No joy either. Families Internet is served thru Charter and they use a Motorola Router. No matter if we reset the router, I cannot connect to the Net but can talk to the router. BTW... my brother only uses WEP as a number of connected items are old and my folks are not in a high threat area for attacks. Frustrated, as I know what I'm doing but this really has me stumped. Any thoughts? Much appreciated, Jim

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• IIS7 response size thresholds

  - by DanielM

  I have a customer who is attempting video playback via HTTP progressive download of very large files ( 1 GB). There is no problem once a file is cached at the edge via my CDN, but hits to my origin (first hits prior to edge-cache population) experience stalling and loss of sync between audio and video about an hour and a half into playback. This occurs pretty reliably at that point, suggesting that some threshold somehwere is getting hit. Are there IIS configuration knobs governing HTTP Response size? Other data points: I am unable to replicate this problem. I am looking at client bandwidth and last mile issues. I am looking at possible encoding recipe dependencies. But this problem never came up when we were using a "push" cache configuration (CDN-hosted origin), so something funky serverside at my origin seems like a likely culprit. Thanks ...

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• Resizing partition in Windows 7: how long does it take?

  - by PaulJ

  Okay, maybe this is me worrying about nothing, but... I have a 500 Gb. external drive where I want to create a second partition. I plug it into my Windows 7 box, use Disk Manager and pick the "Shrink Volume" option. It says that the maximum amount to shrink is around 150 Gb. I hit "OK" and it starts working... and it's been going on for about half an hour. The light of the external HD is constantly working. Disk Manager is greyed out and has the "does not respond" message on the top bar; basically, it's behaving as a non-responding application. Is this normal for a drive of this size, or did the application hang? How long would it typically take for a drive like this to resize its partition?

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