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  • MySQL 5.1 or 5.5?

    - by Miko
    Are there significant differences between versions 5.1 and 5.5? The server in question is used to host a medium-sized vBulletin forum. The main benefit of 5.1 is it's available through apt-get.

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  • Windows 7 XP Mode - Is it possible to have multiple XP Mode Virtual PCs?

    - by STW
    Windows 7's XP Mode virtual PC supports some features that aren't 'stock' with an XP Virtual PC such as a different start-up dialog, no Shutdown button, etc. Possibly the most significant is that applications installed within the XP Mode VM appear within the Windows 7 start-menu. I have a need for multiple XP Mode VM's--is it possible to have 2 or more XP Mode VM's, or to otherwise enable these extra integration features in an XP Virtual PC?

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  • Windows 7 XP Mode - Is it possible to have multiple XP Mode Virtual PCs?

    - by Yoooder
    Win7's XP Mode virtual PC supports some features that aren't 'stock' with an XP Virtual PC such as a different start-up dialog, no Shutdown button, etc. Possibly the most significant is that applications installed within the XP Mode VM appear within the Windows 7 start-menu. I have a need for multiple XP Mode VM's--is it possible to have 2 or more XP Mode vm's, or to otherwise enable these extra integration features in an XP Virtual PC?

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  • Where may I get the EDX platform, the LMS open source project? [closed]

    - by Ramón Girona
    Possible Duplicate: Where can I download edx opensource learning platform? What other learning platforms are opensource? I have just found a query on the edx platform in which I am interested, being a significant piece of Learning Management System open source. I assume superuser platform cares about computer software, and therefore I don't see the question irrelevant. Besides I would like to know why a question is closed with a vague argument as "doesn't fit with the FAQ". Thanks very much, Ramón Girona

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  • File associations not present in Microsoft Office 2010

    - by Babs Carter
    The error when trying to open MS Office is that there is no file association & another error when trying to open individual progs is - side bt side configuration is incorrect. The suite has been working perfectly until last week ( no significant changes to system ) I have tried downloading the VC++ & uninstalled & reinstalled twice, even deleted the registry entry for office 2010 before reinstall but have had no success. Any help would be greatly appreciated!

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  • Is it safe to enable forced ASLR via EMET on Windows?

    - by D.W.
    I'd like to enable forced ASLR for all DLLs on Windows. Is this safe? Background: ASLR is an important security mechanism that helps defend against code injection attacks. DLLs can opt into ASLR, and most do, but some DLLs have not opted into ASLR. If a program loads even a single non-ASLRized DLL, then the program doesn't get the benefit/protection of ASLR. This is a problem, because there are a non-trivial number of DLLs that haven't opted into ASLR. For instance, it was recently revealed that Dropbox injects a DLL into a bunch of processes, and the Dropbox DLL doesn't have ASLR turned on, which negates any ASLR protection they otherwise would have had. Unfortunately, there are many other widely used DLLs that haven't opted into ASLR. This is bad for system security. Microsoft provides several ways to turn on ASLR for all DLLs, even ones that haven't opted into ASLR: On Windows 7 and Windows Server 2008, you can enable "Force ASLR" in the registry. On all Windows versions, you can use Microsoft's EMET tool and enable EMET's "Mandatory ASLR" option. These methods are possible because all DLLs are compiled as position-independent code and they can be relocated to a random location even if they haven't opted into ASLR. These options will ensure that ASLR is turned on, even if the developers of the DLL forgot to opt into ASLR. Thus, forcing on ASLR systemwide may help system security. In principle, turning on forced ASLR could potentially break a poorly-written DLL, so there is some risk of breakage. I'm interested in finding out just significant this risk is. I have the suspicion that this kind of breakage might be extremely rare. Here's what I've been able to find: Microsoft has done compatibility testing with several dozen widely used applications. The only one they found where Mandatory ASLR causes problems is Windows Media Player. All the other applications continue working fine. (See pp.39-41 of this document.) I've seen some anecdotal reports that enabling "Mandatory ASLR"/"Force ASLR" is fine and unlikely to cause problems. CERT reports that AMD and ATI video drivers used to crash if you enabled forced ASLR, but their latest drivers have now fixed this problem. They don't show any other drivers with this problem. A forum post from Microsoft shows no other applications with compatibility problems if ASLR is forced on, as of 2011. A user reports that borderlands.exe, a video game by Gearbox Software, crashes if you turn on mandatory ASLR. What else should I know? Is it relatively safe to turn on Force ASLR / Mandatory ASLR systemwide to harden the secuity of my system, or will I be in for a world of pain and broken applications? How significant is the risk of compatibility problems and broken applications?

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  • Do all web caches understand the "Cache-Control" HTTP header?

    - by chris_l
    I'd like to avoid the "Expires" header, and use "Cache-Control" only - or maybe the other way around. The headers will account for a significant percentage of my traffic, so I'd prefer not to "use both". AFAIK, the "Cache-Control" header was standardized in HTTP 1.1, but are there still web caches/proxies in use, which don't understand it? Note: This could help answering a part of my stackoverflow (bounty) question

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  • Best filesystem choices for NFS storing VMware disk images

    - by mlambie
    Currently we use an iSCSI SAN as storage for several VMware ESXi servers. I am investigating the use of an NFS target on a Linux server for additional virtual machines. I am also open to the idea of using an alternative operating system (like OpenSolaris) if it will provide significant advantages. What Linux-based filesystem favours very large contiguous files (like VMware's disk images)? Alternatively, how have people found ZFS on OpenSolaris for this kind of workload?

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  • EBS with RAID0 (striping) and restoring snapshots

    - by grourk
    We have a MySQL database on EC2 and are looking at the disk IO performance there. Currently we have a single EBS volume with XFS and take snapshots for backup. It seems that a lot of people have seen significant performance gains by striping across multiple EBS volumes with software RAID. If this is done, how does one take snapshots and ensure the consistency of the file system? It seems to me that restoring the file system from multiple snapshots could be tricky.

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  • Upgrade processes between FreeBSD/Ubuntu

    - by bianster
    Are there significant differences between FreeBSD and Ubuntu Linux when it comes to upgrading? FreeBSD appears to offers a more reliable path for upgrades with "freebsd-update" though I think "apt-get update --system" is the equivalent for Ubuntu. I'll like to know which one is less likely to produce SNAFUs when undertaking minor/major updates.

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  • the effect of large number of files on disk space in unix filesystems

    - by user46976
    If I have a text file in Unix that contains N-many independent entries (e.g. records about employees, where each employee has a separate record), is it expected that this file will take up less space than if I split the file into N files, each containing the entry for one employee? in other words, can one save significant space on unix file systems by concatenating many files together, or is the difference negligible? thanks.

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  • Always set "reply-to" for certain recipients?

    - by Benjamin Oakes
    Is it possible to always have Thunderbird set "reply-to" for a certain set of recipients? I sometimes email my significant other at work (about upcoming office parties, events, etc. that she would need to know about), but I'd like to handle the rest of the discussion from my personal email account.

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  • How long to install a new RAID 1 pair in linux using hardware RAID?

    - by Roger H
    Hi, I need to install a pair of 1Tb disks into a server that has a hardware RAID card. How long is it likely to take to configure the RAID controller - sticking the disks in is only a 5 minute job, but is there likely to be significant downtime while both disks mirror (even though they are both blank)? Am I looking at 10 minutes over all, or more like 2 hours for this to happen? Thanks

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  • Make logwatch reports more interesting?

    - by Alexander Shcheblikin
    Is it possible to improve the quality of reports from logwatch? Like make it not just report disk usage which doesn't even change much in daily operation, but report significant changes in usage or approaching critical capacity levels? If I cannot do that with logwatch and instead have to write custom scripts to produce such reports, logwatch appears to be pretty useless, or even dangerous, as many users reportedly grow to ignore emails from it knowing they are so boring.

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  • Do I still need to send the "Expires" header, or can I assume that web caches understand "Cache-Cont

    - by chris_l
    I want to reduce the overhead caused by HTTP headers to a minimum, so I'd like to avoid the "Expires" header, and use "Cache-Control" only - or maybe the other way around (I'm planning to send very short HTTP responses to browsers, so the answer to this question doesn't fully apply here: My headers account for a significant percentage). AFAIK, the "Cache-Control" header was standardized in HTTP 1.1, but are there still web caches/proxies, that don't understand it? Note: This is a sub-question to my stackoverflow (bounty) question

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  • Emacs mode is being applied with the delay

    - by Sergey
    I am trying to use Emacs for developing in Lua, and installed a Lua mode for that. After doing this I was unhappy about the background and changed it by applying the face of my text mode (which I configred by myself). It worked, but now the modified settings for Lua mode are being applied with the significant delay (3-5 sec) after opening a Lua file. Both .emacs and lua-mode.el are byte-compiled. Any advice?

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  • ZFS recordsize for VirtualBox and other virtual disks

    - by JOTN
    Has anyone run across any good benchmarks or other research on tuning the ZFS recordsize when putting virtual disk files on it for a guest OS? I'm using VirtualBox at the moment. I have notice significant performance improvement when working with a DBMS by setting the ZFS recordsize to the same as the DB blocksize, so I'm guessing matching the blocksize of the guest filesystem would also be a good idea.

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  • Can I install an x86 version of XP on an acer aspire one

    - by Liam
    I have bought an acer aspire one which has the intel atom processor running linux and am having difficulty getting a 3G USB modem (huwaei e220) working with it. I have spent a significant amount of time trying to get this working but as the modem is not supported on Linux I have now decided to give in and install xp. Is there a specific version of xp that I need for this processor? or can I install the standard x86 version

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  • What's the difference between DisplayPort, DVI and HDMI?

    - by Leo Bushkin
    As an end consumer, are there any significant differences between the newer DisplayPort interface and DVI/HDMI that I should be aware of? I realize they are different connector types and require compatible equipment, I'm primarily interested in whether there are functional or performance benefits of one technology over another. Should I have a preference for one technology or another on newer video card equipment?

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  • How can the Private Bytes of a process be significantly less than its effect on the system commit charge?

    - by bacar
    On a 64-bit Windows Server 2003, I can see using taskmgr or process explorer that the total commit charge is around 3.5GB, yet when I sum the Private Bytes consumed by each process (by running pslist -m and adding all values under the Priv column) the total comes in at 1.6GB. I know which process seems to be causing this (sqlservr.exe) as when I kill the process, the commit charge drops dramatically. However the process in question is consuming only ~220MB of Private Bytes yet killing the process drops the commit charge by ~1.6GB. How is this possible? How can the commit charge be so significantly greater than Private Bytes, which should represent the amount of committed memory? If some other factor contributes to the commit charge, what is that factor and how can I view its impact in process explorer? Note: I claim that I understand the difference between reserved and committed memory already: my investigations above relate specifically to Private Bytes which includes only committed memory and excludes reserved memory. the Virtual Size of the process in this case is over 4GB, but this should be irrelevant - Virtual Size in procexp represents reserved, not committed memory, and should not contribute to the commit charge. I'm particularly interested in generalised answers to this question: I'm assuming that if sqlservr.exe can behave in this way, that any process potentially could. Further Investigations I notice that pointing Sysinternals VMMap at this process reports a committed "Private Data" of 1.6GB despite Procexp's reported a Private Bytes of 220MB. This is particularly strange given that the documentation for this field in the "Windows® Sysinternals Administrator's Reference" states that: Private Data memory is memory that is allocated by VirtualAlloc and that is not further handled by the Heap Manager or the .NET runtime, or assigned to the Stack category... VMMap’s definition of “Private Data” is more granular than that of Process Explorer’s “private bytes.” Procexp’s “private bytes” includes all private committed memory belonging to the process. i.e. that VMMap's committed "Private Data" should be smaller than procexp's "Private Bytes". Also, after reading the 'Process committed memory' section of Mark Russinovich's excellent Pushing the Limits of Windows: Virtual Memory, he highlights two cases which won't show up in Private Bytes: File mapping views with copy-on-write semantics (however, according to VMMap there is no significant space allocated to Mapped Files). pagefile-backed virtual memory (however, I tried testlimit with the -l flag as suggested, and no significant memory is consumed by pagefile-backed sections)

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  • How can I detect hard drive failures?

    - by Francis
    I am in charge of a large number of Windows servers. Recently, many have been reporting hard drive errors with event codes 11 and 55. CHKDSK indicates that the drives are fine most of the time. What other diagnostic tools could I use to more accurately detect hard drive failures? Could these Windows events be false positives? I have already evaluated S.M.A.R.T., and it seems to have significant sensitivity and specificity issues.

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  • Where is the used memory in Task Manager & Resource Monitor coming from?

    - by Sam Adams
    On a Windows 7, the working set memory usage plus private memory does not add up to the total used memory in Task Manager and Windows 7 Resource Monitor. How do you find out where the used memory is coming from? The cached memory can't be part of it because sometimes the total cache is greater than the total in use. The commit memory plus the working set also doesn't add up to the total in use - but even that shouldn't be significant if it did, since commit is virtual.

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