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  • Battery backed write cache behavior upon disk change

    - by Halfgaar
    We use 3ware Inc 9650SE SATA-II RAID PCIe RAID controllers with battery backed write cache. Our spare hardware has the same controller. I was wondering; are these controllers smart enough not to sync the cache when the disks have been changed? For example, if I deploy one of those spare machines by putting in the disks of another machine and that spare machine still has pending writes, will it be smart enough not to perform those writes on the replaced array? Edit: my scenario is not really made clear, so let me give an example: server1 goes down because of power supply failure. I put the disks in server2 and start. I repair server1 I put the disks back from server2 in server1 (it's not relevant right now that in reality I would probably keep server2 running). If server1 doesn't have safeguards, it will write to the array, thinking it's simply powering up again, corrupting it.

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  • Is there such thing as a portable database that runs easily OsX and Windows?

    - by Jean-Philippe Murray
    I need to make a small database for a project at school (not computer related at all, I'm indexing and categorizing paper documents of a research projet). The thing is that in september, my semester is over and other students will have to taker over the project (and so on, for every semester!), so I'd need something that would be free and OS agnostic (or at least OsX/Windows) so it would easily be given to the next students on the project. I was thinking about a WAMP running USB key that would have a MySQL / HTML interface, but it will become locked to the OS I choose first. LibreOffice and the likes will be an option in the end if I don't find anything truly portable. Anyone has a solution in mind?

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  • Munin "Available entropy" when using address space layout randomization

    - by clawspoon
    Having just configured munin for statistics logging on my gentoo server (hardened profile), I am noticing that my "Available entropy" is consitently in the 200-300 range. This seems way to low, so I checked it manually using the command $ cat /proc/sys/kernel/random/entropy_avail 3544 Odd. Consistently very low values in Munin and practically filled up when checking manually. After thinking about the problem for a while I came to the conclusion that the problem is probably that I'm using Adress Space Layout Randomization which is using the entropy when running commands/programs. Since Munin runs a whole slew of programs all the entropy is used up, and Munin then measures how much entropy there is, resulting in the low values. Does anyone have any experience with this? How can this be avoided?

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  • Dropped Dell XPS has hard-drive trouble

    - by Alex B.
    Yesterday, my mom dropped her laptop to the floor and got the blue screen of death after trying to boot the system. I was able to start a Fedora live CD and get some of her stuff off the hard drive, but I cannot seem to be able to install Windows on it. The installation starts loading files and then the computer turns off. I am thinking that she might need a new hard drive. Any ideas? Edit: I actually was able to boot the Windows XP installation but it is saying that no hard disk is detected. How can this be possible if I was able to mount the drive on fedora yesterday?

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  • Facebook doesn't work on computer, but work on mobile device, both use the same router

    - by sasa
    I have a very strange problem and I'm thinking that can be problem with dns or something similar, but not sure and don't know how to solve. My computer is connected to router and every site works fine except facebook (Chrome and Firefox). Chrome shows "Error 101 (net::ERR_CONNECTION_RESET): The connection was reset." But, on mobile device witch is connected to the same router facebook works fine (Fb application and Delphin browser). Pinging facebook works fine. Clearing cookies and cache didn't help. Also, I performed antivirus and antimalware scan and there is nothing. What can be a problem? Update: I'm also connect notebook on that wifi router, and on it works fine. nslookup facebook.com Server: UnKnown Address: 192.168.1.1 Non-authoritative answer: Name: facebook.com Addresses: 2a03:2880:2110:3f01:face:b00c:: 2a03:2880:10:1f02:face:b00c:0:25 2a03:2880:10:8f01:face:b00c:0:25 69.171.224.37 69.171.229.11 69.171.242.11 66.220.149.11 66.220.158.11

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  • PBX with Fax and Google Voice

    - by Phill Pafford
    Looking to replace/port my home number which I use for mainly faxing for my home business to a PBX server ( Thinking Asterisk or Elastix ). My question is: Does Asterisk/Elastix support Faxing ( Incoming / Outgoing ) Does Asterisk/Elastix support Google Voice Here is what I'm looking to do: Run some sort of PBX software from my own home server that will allow me to use Google Voice for my home number, possibly allow multiple Google voice ( Though I could live with just the one ) and must support Faxing ( Incoming and Outgoing ). Would Asterisk/Elastix support all of this or would you recommend something else for this? Looking to avoid some of the pitfalls that could happen I like Ubuntu if a Linux environment is needed

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  • gcc sandboxing tool - AppArmor / CHROOT jail on Ubuntu 12.04

    - by StuR
    We have a Node application as the front end to a C++ sandboxing tool, which compiles code using gcc and outputs the result to the browser. e.g. exec("gcc -o /tmp/test /tmp/test.cpp", function (error, stdout, stderr) { if(!stderr) { execFile('/tmp/test', function(error, stdout, stderr) {}); } }); This works fine. However, as you can imagine this is a security nightmare if it were to be made public - so I was thinking of two options to protect my stack: 1) A CHROOT jail - but this in itself wouldn't be enough to prevent directory traversal / file access. 2) AppArmor ? So my question is really, how could I protect my stack from any nasties that could come from: A) Compiling unknown code using gcc B) Executing the compiled code

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  • Palm software that can turn the Palm IR keyboard into a Bluetooth keyboard for PC?

    - by Stu
    I had this kooky idea this morning. I love my foldout palm keyboard, but it only speaks IR to my Palm Treo. But it also has a Bluetooth radio so I thought wouldn't it be just keen to have a program that runs on the Treo that reads from the IR the keyboard and exposes it as a Bluetooth keyboard for a PC. I realize I'm way late to the game because there's so little information about the Palm anymore. I was thinking of writing this software if it wasn't too big of a deal, but I figured I'd see if anybody knew of such a project already in existence or something like it that I could piggyback off of. Not even sure if I can get the Palm OS Developers' kit anymore....

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  • How to use my computer to control a lamp?

    - by nona urbiz
    I've been researching computer automation systems, but everything I've found has been overkill for what I'm interested in. Can anyone help me control a lamp that is on my desk, plugged in the wall beneath the desk, with my computer (also on the desk, usually). What got me thinking is that I have the lamp plugged into a Belkin extension cord/surge protector that came with a wireless switch that toggles the power going to 6 of the eight sockets. Can I somehow hook my computer into this? I'm not too afraid to get into some wiring type thing, but do have a somewhat limited budget. It'd also be cool to get a dimmer in the loop too. thanks aha. after more research, i have realized what i'm looking for is instructions for a DIY version of this that won't look so ugly, and that i can build a UI for rather than shortcuts.

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  • Naming standard for additional A records/IP addresses for IIS servers?

    - by serialhobbyist
    When you're adding another IP address to and IIS server, what naming standards do you use for the A records? Background: I've a bunch of sites on an IIS server which use (CNAME'd) host-headers and a single IP address. Server names (and A records) adhere to unfriendly (as in difficult-to-remember) naming standards whereas CNAMEs, and therefore host-headers, can be friendly. Now I've a need for several SSL certificates for different sites. I was thinking about using an additional IP address for each to-be-SSL'd site but still using friendly CNAMEs. So then I come to what to call the A record. What do you do? Related to this question.

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  • How to maximise performance in computers connected into LAN via Gigabit ethernet router?

    - by penyuan
    Our group is setting up a server (which might just be a NAS, but we're not sure yet), which shares files, so that it connects to all other computers in the room (about 10 of them). I am thinking just hooking all of them up via a gigabit router/switch. Is there anything I should watch out for, in terms of cables, connections, or the connection capabilities of each computer in the network? For instance, I don't want a slow computer in the LAN to slow down everyone else's connection, etc., etc. Thanks for the education.

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  • external HDD with SATA & USB interface?

    - by Greg
    Anyone know of an external HDD that would have (in addition to USB) a SATA (eSATA) port/cable? i.e. Brand/Model. Preferably one of the name brands so I have a better change of finding it here or locally if possible. Background - In one location I want to use it is I would like to increase the performance by cabling it directly to the PC SATA port, HOWEVER I don't want to have to open up the PC to do this each time. I was thinking of running a SATA cable out through the PC case so I just plug it directly into the external HDD in question. Perhaps it should be also externally powered too so I don't need to run a power cable out from the PC power supply.

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  • How can I keep websites from knowing where I live?

    - by D Connors
    This questions is related to issues and practicality, not security. I live in Brazil and, apparently, every single website I visit knows about it. Usually that's ok, but there are quite a few sites that don't make use of that information adequately. For instance: Bing keeps thinking that brazilian pages are way more relevant to me than american ones (which they're not). Google.com always redirects me to google.com.br. Microsoft automatically sends me to horribly translated support pages in portuguese (which would just be easier to read in english). These are just a few examples. Usually it's stuff I can live with (or work around), but some of them are just plain irritating. I have geolocation disabled in firefox, so I guess they're either getting this information from my IP or from windows itself (which I bought here). Is there a way to avoid this? Either tell them nothing or make them think I live somewhere else? Thanks

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  • making cookies persistent in IE8

    - by Jamie Stevens
    There's a website I sign into frequently, and I'm getting sick of entering my username and password every time. The website can remember who I am so long as I don't close my browser (Internet Explorer 8), but when I do it forgets me, and asks me to login again. I'm guessing this is because it's using a cookie (and perhaps a session) that expires when I close my browser. Is there anyway to make this information persistent across each time I load my browser? (I tried exporting the cookies to a file, and then importing them as soon as the browser was reloaded, but that didn't work either... I'm thinking the cookie text file needs to be modified somehow.) (FYI The website is http://blackboard.unh.edu, but you won't have access unless you happen to be a student there :-) NOTE: I'm not interested in using any password remembering features in the browser. The only solution I'm open to is making the cookie / session persistent somehow!

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  • MySQL Windows vs. Linux: performance, caveats, pros and cons?

    - by gravyface
    Looking for (preferrably) some hard data or at least some experienced anecdotal responses with regards to hosting a MySQL database (roughly 5k transactions a day, 60-70% more reads than writes, < 100k of data per transaction i.e. no large binary objects like images, etc.) on Windows 2003/2008 vs. a Debian-based derivative (Ubuntu/Debian, etc.). This server will function only as a database server with a separate Web server on another physical box; this server will require remote access for management (SSH for Linux, RDP for Windows). I suspect that the Linux kernel/OS will compete less than the Windows Server for resources, but for this I can't be certain. There's also security footprint: even with Windows 2008, I'm thinking that the Linux box can be locked down more easily than the Windows Server. Anyone have any experience with both configurations?

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  • master-slave-slave replication: master will become bottleneck for writes

    - by JMW
    hi, the mysql database has arround 2TB of data. i have a master-slave-slave replication running. the application that uses the database does read (SELECT) queries just on one of the 2 slaves and write (DELETE/INSERT/UPDATE) queries on the master. the application does way more reads, than writes. if we have a problem with the read (SELECT) queries, we can just add another slave database and tell the application, that there is another salve. so it scales well... Currently, the master is running arround 40% disk io due to the writes. So i'm thinking about how to scale the the database in the future. Because one day the master will be overloaded. What could be a solution there? maybe mysql cluster? if so, are there any pitfalls or limitations in switching the database to ndb? thanks a lot in advance... :)

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  • Is there a point to using theft tracking software like Prey on my laptop, if you have login security?

    - by Reckage
    Hey, so I have a Thinkpad that I use in a variety of places (coffee shops, work, etc.). I don't generally abandon it, but I figure there's a chance I might get careless and it gets stolen at some point. I was thinking of installing something like Prey (http://preyproject.com/), but my OS installs are password secured, and on top of that, I have a fingerprint reader that you need just to get through the BIOS. So: is there actually any benefit to setting up software that tracks the laptop's whereabouts? I imagine that either: The laptop won't boot or login, if the thief doesn't get past the security. If the thief goes around said security somehow, presumably they've split the laptop for parts or bypassed BIOS security, gotten stuck on Windows security and formatted it. Given that it's highly unlikely that the thief would go to the trouble, what's the utility in installing laptop tracking software like Prey?

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  • Security Audit Failures in Event Viewer Windows Server 2008R2

    - by Jacob
    When I am looking at the security tab of my event viewer on a Windows Server 2008 R2, I am showing a ton of Audit Failures with Event ID 4776. The computer attempted to validate the credentials for an account. Authentication Package: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0 Logon Account: randy Source Workstation: HPDB1 Error Code: 0xc0000064 I verified the account "randy" exist in my Active Directory. From my understanding, there has not been any recent password changes. Is there any way to get detailed information on this error? I am wondering what program is requesting this information. Also, is there any way to clear this error up? I was thinking about resetting the password and changing it back to the original.

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  • Cannot find the 2nd datastore after upgrading ESXi 3.5

    - by aXqd
    I have an ESXi server (version 3.5) with about 60 VMs. It has 2 hard disks, each of which is regarded as a datastore. After upgrading through 'VMware Infrastructure Update' tool(still staying with 3.5 instead of 4.0) and a reboot, I can only see the 1st datastore. Hence many VMs are, now, inaccessible. I wonder how I can get the 2nd datastore back. I am sorry, but I did't have the 2nd datastore backuped before. BTW, I am still thinking of upgrading directly to version 4.0 to see if it can fix the driver problem. How about that?

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  • Can someone correct me about Windows 2008 DFS implementation

    - by cwheeler33
    I have 2 two Windows 2003 file servers using DoubleTake at the moment. They are in an 2003 AD domain. And each server has it's own disk set. It is time to replace the servers... I want to use Windows 2008 64bit Ent. I was thinking of using DFS-R to replace DoubleTake. The part I'm not sure about is clustering. Do I need to have shared storage if each server has a copy of the data? I want to have the data available to the same share name, so maybe I don't fully understand how DFS is set up. I currently have about 6TB of data. I expect to grow by 3TB a year on these file servers. Any resources/books that could teach me would be good to know as well.

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  • stdout and key press

    - by Jack
    Hi, when in console, if I press a key, some interrupt controller sends code of that key to CPU, which looks into some table and than represent that keypress by printing some charracter to stdout. But, is keyboard sending an ASCII code of that key, or just some standardised code? Since there is so many languages and extra characters, OS must further translate its code into some character according to user selected scheme, I guess. I ask, becouse I am from Czech Republic, and we use some characters that do not exists in standart ASCII code. So I was thinking, if I enter this character into a console, and then print it, lets say in C++ using cin and cout, and I have set locale to Czech, stdin must actually send some non-ASCII code of the character I pressed to input stream. Am I right?

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  • Browser/addon which shows what's been downloaded so far regardless of formatting and layout ?

    - by Mick
    Every now and then a website becomes super-slow (but not broken) because there are too many people looking at it at the same time. When I try and view such a site, say with Firefox, I can see that it is downloading all sorts of components of the site because of the progress information printed at the bottom of the window and I'm sitting there thinking "If only the browser would show me what it's got so far. I don't care if its a jumbled mess, I just want to see what you've got". Does any browser offer such an option?

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  • FDE with DiskCryptor V1 (TRIM Support) on Crucial M4 SSD on W7 x64 - Unpartitioned Space?

    - by JamesM
    I have a new Alienware m11 laptop with a brand new Crucial M4 128GB SSD. I have installed the SSD but not used it yet. I am thinking of using FDE with DiskCryptor 1.0.732.111. I will install Win7 Pro x64. I have read about support for TRIM in v1.0.732.111 but also about leaving unpartitioned space. My SSD drive, 'Crucual M4' does not have a manufacturer built-in reserve like other drives. My questions are: Should I leave some free unpartitioned space with v1 of DC and W7x64 even though it will support TRIM or should I not do this? Should I install DC v1 first or after installing Windows 7 (assuming it is brand new, never been used SSD)?

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  • Installing a bundled set of multiple apps automatically and silently

    - by Reckage
    Hi all, When I install Windows, I like to deploy a set of the same apps (for example, Firefox, Chrome, Trillian, 7-Zip, etc.). I'd prefer to have a way of doing it all in one sitting, and I seem to remember there being a way of bundling all the installers. I was able to find two, though neither of them (Almeza MultiSet, WPIW) look like what I was thinking of. Can anyone recommend other ways of running a whole set of installers at once? Thanks! (Will add links when I get enough points)

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  • Disable CD eject button on Windows laptop

    - by Marc Gravell
    Most laptops have a CD eject that is very sensitive, and placed such that it regularly gets triggered when handling the laptop. This is in particular a problem (for clumsy-handed me) when picking up the laptop to stow in in a laptop bag; I've lost count of the number of times it has ejected just as I am lowering it into the case! I rarely use a CD, but I am wondering whether some crafty software hack (or other trick) might be possible to make it less vulnerable. Perhaps trying to fool it into thinking it is busy (but ideally without destroying my battery). Otherwise, I might as well bow to the inevitable and snap the darned thing off. I'm not making this brand-specific, as I've seen this problem on a range of both branded and re-badged laptops. I am, however, mainly interested in windows-friendly solutions.

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