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• How does MySQL 5.5 and InnoDB on Linux use RAM?

  - by Loren

  Does MySQL 5.5 InnoDB keep indexes in memory and tables on disk? Does it ever do it's own in-memory caching of part or whole tables? Or does it completely rely on the OS page cache (I'm guessing that it does since Facebook's SSD cache that was built for MySQL was done at the OS-level: https://github.com/facebook/flashcache/)? Does Linux by default use all of the available RAM for the page cache? So if RAM size exceeds table size + memory used by processes, then when MySQL server starts and reads the whole table for the first time it will be from disk, and from that point on the whole table is in RAM? So using Alchemy Database (SQL on top of Redis, everything always in RAM: http://code.google.com/p/alchemydatabase/) shouldn't be much faster than MySQL, given the same size RAM and database?

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• Remote access not working without connected monitor

  - by winSharp93

  I am trying to configure a Windows Server 2008 as a Home Server for my personal use (mainly for storing documents, hosting source-control, etc.). The "server" consists of an Intel Atom 2700DC board and an Intel SSD. Configuring remote access to the server, I am confronted with a very strange problem: As long as a monitor is connected to my server, remote access works without any problems. However, when no monitor is connected at boot-time, remote access simply won't work (I keep getting errors when trying to connect that the remote server was not found or that remote access is disabled). Windows definitely boots when no monitor is connected as I receive a message asking me whether to enter safe mode when booting after powering the server down by plugging the power cord. When I plug in a monitor after boot, it stays turned off and remote desktop connections still fail. Do you have any ideas about what I could try?

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• Break a hard link of a file in use

  - by Stebi

  I used hard links to merge duplicated files on my SSD (space is still precious) and now have a weird problem. Common files like msvcr110.dll got hard linked. Now I want to delete a program which has this file in its installation directory. But I cannot because this file (on another location) is used by a currently running application (don't know which) and windows doesn't allow me to delete this file because it's in use. I can rename the file but it still points to the same file, so not possible to delete it. Is there any way to break a the hard link of a file which is currently in use? I currently use a trash folder where I move those files to so I can delete the directory structure of program to be deleted. But I'd like to get rid of this leftover (although it doesn't take much space as it's a hard link).

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• Concerns about a Dedicated (Windows Server 2008) + DDoS

  - by TheKillerDev

  I am have today a dedicated server with these specs: Intel Core i5 750, 2x120GB (ssd + raid), Windows Server 2008 Web, 200Mbps Network, 24 Gb DD3 And I would like to know what are the best thing I can do to prevent a DDoS Attack, since I know this will be a real threat by the importance of the files that will be archived in it. Today I have apache listening port 80 and RDC listening port 3389. But the security is beeing made only by Windows Firewall. So, any thoughts on what would be good to prevent from DDoS attacks?

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• Unable to diagnose Windows 7 lockup

  - by Delyan

  Basic info: Laptop Dell Studio XPS 13 (Intel P9600, 4GB RAM, NVidia 9400M card, 256G Samsung PM800 SSD) Windows 7 Ultimate, as well as Fedora 14 Here's the deal - Windows would just lock up out of nowhere, no log entries, no dumps, no BSOD, it just freezes. This happens mostly when idle (but it happened when I was using it too) and does not follow a concrete time frame. No input is accepted - only solution is to hold the power button. Although this sounds like a clean cut hardware issue, the reason I'm willing to rule this out is that my primary OS is Fedora 14. It's been working fine for the past 2 years and I've been stress testing the hardware (intentionally or not) every once in a while with no issues. I would like to ask if there's any way to get a diagnostic output from Windows in a situation such as this. The next step in my testing is to leave it in Safe Mode overnight and see if it locks up but even if I do that, I still need to figure out what component freezes it up during normal operation.

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• How to best config my PC. 2 small SDDs and a 1TB conventional drive

  - by Chadworthington

  I just got a new PC. It has 3 drives C Drive: 80GB SDD Drive P Drive: 120GB SDD (for core programs) D Drive: 1TB SDD (for data and other) I have an MSDN subscription and I am the type of person that loves to install tons of software to check it out. I am very worried that installation programs are forcing me to place a large amount of files on the small C drive. I fear that I will quickly run out of space on my C drive while having ample space on my TB drive. What would you do in my shoes? I didn't select this PC or set the config up. I am wishing that the 120 SSD was my C, to give me a little more room to grow. I guess there are no magic solutions here but I am just looking for your general thoughts

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• Hide Drive / Avoid Low Diskspace Warning on ReadyBoost Cache?

  - by Simon Richter

  I've just added an SSD as a ReadyBoost cache drive, and have two minor cosmetic issues with it: the drive still shows up in the drive list I get a warning balloon every five minutes that the drive is full and that I should empty the Recycle Bin. The former is ignorable (and I guess I can solve it with a group policy); the latter is somewhat going on my nerves. Are there official buttons "hide ReadyBoost drives" and "do not warn on low diskspace for ReadyBoost drives" somewhere that I may have missed? If not, I guess I can use the group policy to hide the drive; I'd still need a way for the system to not warn about the drive being full. Also, am I right that I need to assign a drive letter and format the drive with NTFS to use it for ReadyBoost, or is there a way to just use the raw device?

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• Is SATA bandwith per Port or per Controller?

  - by instanceofTom

  I always assumed that it was per Controller channel, and that If I have 4xSATA 3.0Gb/s ports on my Motherboard then I should have a potential 12.0Gb/s of bandwith. However, after doing some searching I found conflicting information suggesting that if I had 4xSATA drives connected to my MB and were using them simultaneously each drive would get only 3.0Gb/s /4 = 768 Mb/s max bandwith. So I wanted to clear up my understanding. Side question: Are there other hdd/ssd bandwith bottlenecks to be aware of? (Links to already answered questions are more than welcome)

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• VMware Fusion / New Machine / verify VMs?

  - by drewk

  I just got a 15" MacBook Pro with 8GB RAM, 2.66 i7 and 500GB SSD. Very sweet and fast! My old machine was 2.66 Core 2 Duo. I used Migration Assistant to migrate my old MBP to the new. When I started VMware to run Windows and Ubuntu I got the message first This VM has been moved or copied to a new machine. Did you move or copy it? I answered Copied. Then I got the message this CPU is a different configuration than the machine that created the VM. You may get unpredictable results. I answered Open Anyway. Windows XP, Windows 7, and Ubuntu all seem to work OK, but how can I verify? Is there some form of test harness for a VM? I have had a VM degrade and become unusable with very catastrophic data loss (on Parallels...), so I am a bit paranoid. Thanks,

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• Intel Rapid Start Driver Reinstallation doesn't work?

  - by elegantonyx

  I recently had to reformat my entire drive and reinstall Windows 7. Something that bothers me is that when I was downloading the Intel Rapid Start driver (I have a Lenovo Ideapad Y480, and it comes standard with the Rapid Start) and tried to install it, the installer claimed that my system did not meet the requirements in order to install, when it was previously installed by the OEM. My startup times have increased from 21 seconds to log-in screen to 50 seconds. Please help... Specs: Lenovo Ideapad Y480 Intel Core i7-3610 Ivy Bridge (quad-core) Nvidia Geforce 640M LE with 2gb VRAM 8GB RAM 1TB hard drive, 32 GB SSD (OEM installed)

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• Any Suggestions on How to Soup Up/ Mod a MacBook Pro 13"?

  - by 5arx

  So I've got a mid-2009 MacBook Pro 13". Integrated GPU so not a games machine but fast enough for doing .Net development in VMs. I love the little thing and wanted to give it a Christmas present so thought I'd mod it up a bit and give it a boost. I'm probably going to go for a 500GB Seagate Momentus XT hybrid drive rather than full-on SSD (I need 500GB space) but was wondering if there are any other mods/tweaks people could suggest? I saw something online about swapping a HDD for the DVD drive and wondered if anyone had tried this or similarly drastic mods to the smallest of the MBPs. Cheers.

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• How anti-virus on the host machne affects performance of virtual machines?

  - by Ladislav Mrnka

  I'm diagnosing some issue with Oracle virtual box where virtual machine sometimes perform terribly slow (much slower then notebook with worse configuration): Notebook i7 (2 cores with HT = 4 logical CPUs), 4GB RAM, 5400 rpm disk, Win 7 64bit Virtual machine (Oracle Virtual Box) Host: i7 (4 cores with HT = 8 logical CPUs, 12 GB RAM, system runs from SSD, virtual machine from 7200 rpm disk, Win 7 64bit) Virtual machine: 4 cores assigned, 8 GB RAM assigned, Win 2008 R2 Enterprise (64 bit) Virtual machine uses bridge to separate network interface (machine has two) VPN for network communication No other virtual machine runs on the host Host has installed ESET Smart Security All SW is updated with last version. My question is if anti-virus on the host machine can somehow affect performance of the virtual machine and if so how can I turn it off without turning the anti-virus itself?

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• Why has my Mac been running fsck_hfs for two days now?

  - by Nate

  I first noticed that fsck_hfs was running, taking up 50-75% of a CPU, yesterday. It continues to run today. ps shows that it is doing /sbin/fsck_hfs -f -n -x -E /dev/disk3. Only problem: I don’t think I have a /dev/disk3. Why is it running? Will it ever finish? Can I kill it? What is /dev/disk3? Could it be my Time Machine volume, which is not mounted at the moment? System Info: MacBook Pro (2008). It has two disks installed—the internal disk (/dev/disk1) and a PC Card SSD (/dev/disk0, surprisingly). It connects to a remote Time Machine volume attached to an Airport Extreme base station.

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• Out Of Memory Error - Magento

  - by robobobobo

  Ok normally I understand when my server is giving me out of memory errors, but this one has me stumped! I'm running a magento based site, with one or two plugins in it and the rest is pretty basic. The site runs and loads fine wiht no issues. However in the backend - Configuration - Payment Methods it gives me the following out of memory error Fatal error: Out of memory (allocated 39059456) (tried to allocate 85 bytes) in ########/Varien/Simplexml/Element.php on line 84 Now this is where I'm confused..it's allocated more than it tried to allocate? Am I correct there? So how is it running out of memory? My server has 6Gb ram, an SSD and 2 CPU's running WHM with a few other low traffic sites on it. I set my php memory limit to 100mb, 1000mb and finally unlimited but all to no avail! I'm completely lost here, would really appreciate some expertise on this Cheers

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• Why can't I create a Windows backup on my secondary disk?

  - by Brian Sullivan

  I've installed Windows 7 Ultimate on an SSD that I've added to the XPS desktop that I bought from Dell. I would like to use the built-in backup functionality to create incremental backups and store them on the large drive that came with the machine. I formatted the large drive and turned it into a Basic disk. However, when I try to set the backup location to the large internal disk (E:\) in the "Set up backup" wizard, a get a message saying, "A system image cannot be saved on a drive that your computer boots from or that Windows is installed on." Windows is not installed on that disk. I even deleted the OEM partition that was on the disk, and removed it completely from the boot order in the BIOS. Any clue why Windows is griping at me about this?

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• md5sum of large files gives different results sometimes

  - by Emanuele

  I have an AMD quad core, 8 gb RAM, 1 SSD EXT2 (2 months old), 2 HDD EXT4, approximately 1 year old. I'm using Ubuntu 10.04 x86-64 and when I compute the md5sum of large files (9 GB) sometimes I get different values than the one stored on a reference file. Upon restarting and switching off the PC then I get the expected results no matter how many times I repeat it. But this is random. I've turn on ECC (the fastest possible settings) and the issue seems to be rarer, but I've run memtest86+ for 6+ hours without a glitch (and with ECC off!). Any idea? Should I update the BIOS of my motherboard (Asus EVO-something...don't remember it now)? I've tried all the rest apart this, but genuinely don't know what to do anymore... Any suggestion is appreciated!

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• Windows 7 "Could not reconnect all network drives" on boot

  - by Thermionix

  Windows 7 won't reconnect to my network drives on startup. Once it is done booting opening Windows Explorer and clicking each share will mount them. Windows 7 Enterprise N Service Pack 1 I have attempted formatting the windows machine - first thing done to machine was to map the network drives, upon reboot they were disconnected. It is running on an Crucial M4 64gb SSD. The host of the network shares is a Ubuntu-Server machine connected through a gigabit switch. A modem provides dhcp, although both these machines have static IP's defined. It won't reconnect the drives regardless of whether they're SAMBA shares or NFS shares - therefore I believe it's an issue with the windows machine. Ubuntu 11.10 (GNU/Linux 3.0.0-12-server x86_64) I've tried using ip address instead of netbios name for mapping shares on the windows machine, Also tried setting EnableLinkedConnections=1 gpedit.msc Computer Configuration - Administrative Templates - System-Logon - always wait for the network at computer startup and logon = yes

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• Server 2012 Storage Pools, Raid Controller... can the Storage Pool deal with it?

  - by TomTom

  Before trying it out - I don't find any documentation. Given that Storage Pools have serious performance problems with parity, and do not rebalance data at the moment when you add discs, my preferred way to use them would be as think provisioned space, ISCSI targets - with every "Pool" running against 1 RAID that comes from a Raid controller (who also introduces SSD read and write caching - another thing missing from Storage Pools). The main question is - how does a Storage Pool handle the change in the underlying disc that can happen? I mostly talk about OCE (Online Capacity Expansion), where a disc after an expansion suddenly reports a larger space. Standard Windows allows you to use this additional space (and expand the partitions). How does a storage pool handle it?

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• How to upgrade to Windows 8.1 on a machine with a Users folder on a separate drive?

  - by ahsteele

  I tried to upgrade from Windows 8 to Windows 8.1. Unfortunately, during the upgrade process I receive the following error: Sorry, it looks like this PC can't run Windows 8.1. This might be because the Users or Program Files folder is being redirected to another partition. Which is accurate in that I have my Users directory on my D: drive and Windows installed on my C: drive. I do this because my C: drive is an SSD drive and D: drive is a spinning rust drive where I keep my data. Is it possible to upgrade to Windows 8.1 from a Windows 8 install with a redirected Users folder? I do not consider a full reinstall of Windows 8 with a non-mapped Users folder and then upgrading that installation to be "upgrading."

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• smartOS HPC config suggestion

  - by Andrew B.

  I'm configuring a brand new HPC server and am interested in using SmartOS because of it's virtualization control and zfs features. Does this configuration make sense for a SmartOS HPC, or would you recommend an alternative? System Specs: 2x 8-core xeon 384 GB RAM 30 TB HDs with 2x512GB SSDs Uses: - zfs for serving data to different vms, and over the network; 1 SSD for L2ARC and 1 for ZIL - typically 1-2 ubuntu instances running R and custom C/C++ code My biggest concerns as a newbie to SmartOS and ZFS are: (1) will I get near-metal performance from ubuntu running on SmartOS if it is the only active vm? (2) how do I serve data from the global zfs pool to the containers and other network devices?

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• Read ahead buffering while playing video file from optical disc

  - by Saxtus

  I was wondering if there is a program for Windows 7 (64-bit), that reads ahead the file to be played back (usually MKV files in my case) to the RAM, so the disc that the video file resides in, won't spin for the entire duration of the playback, but only every time the cache is almost empty (with big enough cache so it won't need the drive for long periods). A program that I've used in the past (called DVDIdle), was doing that universally for every video player I wanted, but they've stopped updating it 6 years ago and now it doesn't seem to work with Windows 7 (tried using compatibility mode too). The method I am using now, is to either have the drive wearing down and buzzing all the time or manually copy the entire file to HDD, SSD or RamDisk and play it from there. The closest thing I've found, is a software that slows down the drive's spin speed, but I was looking for something more convenient, automated, without waiting for an entire file to be copied before starting playback or needing any HDD space, like I've used to in the past. Thanks in advance.

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• Computer temporarily freezes and then resumes

  - by trizicus

  This happens on ALL operating systems (7, Ubuntu, etc.). What happens is everything for 1-3 seconds becomes unresponsive, I then hear what sounds like my other internal hard drive 'spinning up', and then viola everything is responsive again. Note: Already ran SMART tests, no issues at all. I think issue is that the HDD spins down and when need it gets 'turned-on' (OS settings turn off HDD's after 20 mins of inactivity) and because my pagefile is on the other HDD it causes OS to temporarily freeze. Need more tips, and insight. Thanks More info: Running Quad CPU, 4GB RAM, Intel SSD, GT 240.

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• Is it dangerous to add/remove a hard-drive to a Windows machine which is in stand by?

  - by Adal

  Can I add a SATA drive to a Windows 7 machine which is in standby mode? The hardware supports hot-plug. Could pulling the drive out while in standby corrupt the data on the drive (unflushed caches, ...)? Does Windows flush before standing by? How about swapping a drive with another drive of different kind (SSD - mechanical disk) and size, also while in stand-by. Could the OS when waking up believe that the old drive is still there, and write to it and thus corrupt it, since the new one has different partitions and data?

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• Is it possible to install a bootable version of Windows 7 onto a flash stick?

  - by sam

  I'm thinking of changing to a new laptop that only comes with a 256gb SSD. It's not tons of room, but not inadequate either. One thing I have on my HD at the moment that takes up a lot of room but is rarely used is a partition with a bootable version of Windows 7 (I'm on a mac). Would it be possible to install a bootable copy of Windows 7 onto a flash drive? I was thinking of using a 64gb Sandisk Cruzer USB 2.0, so that when I need to dip into Windows every now and again I could just plug in the flash drive.

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• NVIDIA Driver Crashing on Custom-Built Windows 7 PC

  - by srunni

  I've got a custom-built PC with these specs: Fractal Design Define R3 ASUS P8Z77-V motherboard Intel Core i7-2700k with Thermalright HR-02 Macho Cooler NVIDIA GeForce GTX 560 with Arctic Cooling Accelero Twin Turbo II Cooler Crucial M4 128 GB SSD 1 TB Hitachi HDD G.SKILL Ares Series 2x8 GB RAM (x2) SeaSonic 520W PSU Windows 7 Ultimate SP1 (x64) NVIDIA driver version 301.42 Upon building the PC, I overclocked the CPU (but never the GPU), and there were no problems for 1-2 months. Then I started getting crashes with this error when doing anything that's computationally or graphically intensive: I un-overclocked the CPU, but that hasn't fixed anything. This is what the inside of my case looks like: I'd appreciate any guidance on resolving this problem. I did get some of the thermal paste on the graphics card when installing the aftermarket cooler, but there were no issues for a month or two. Update I did a clean install and the issue persisted - looks like it's a hardware issue. I will try removing/cleaning/reseating all the parts.

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