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  • Is it safe to use up all memory on linux server, not leaving anything for the cache?

    - by Temnovit
    I have a CentOS server fully dedicated to MySQL 5.5 (with innodb tables mostly). Server has 32 GB RAM, SSD disks, and avarage memory usage looks like this: So about 25GB is in use and about 6.5GB is cached. I am experiencing performance problems with WRITE queries, so I was thinking, is this the optimal cache size? I might increase innodb buffer size, so that linux cache would become smaller, or decrease it, so it would be bigger. What is the optimal used/cached memory balance for busy MySQL server on linux?

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  • Is my laptop good enough to support my development needs? [closed]

    - by KodeSeeker
    I have an ASUS Pentium-R Dual Core CPU running at 2.20Ghz. It has 4 gb of built in ram, currently running a 64 bit Windows 7 . I just started graduate school and Im wondering whether I should go in for a new laptop or just repair the nagging battery on my current one. My requirements include - -Ability to support IDE's - I may end up running Eclipse, Visual Studio's and the like to help with my work. - Ability to run multiple VM's (not concurrently). Im currently running a Ubuntu 12 and 9 as VM's (not sure if this is overloading the system) - I'm a non gamer so I really dont care about a minor glitch caused by running a uber heavy game. -In addition I will have heavy use of Office Application Software and will be using my computer to watch movies and stream media. Looking forward to your replies and suggestions!

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  • How to calculate proper amount of inode/block sizes for a linux filesystem.

    - by Donatello
    I have an old reiser filesystem which I'm going to convert to Ext3. The problem I have is to determine the proper block- and inode-sizes for this partition. The partition is 44 GB large and has to hold 3,000,000+ files of sizes between 1 kb and 10kb, how can I figure out the best ratio of inodes and blocksize? The below is something I tried which seems OK but makes the copying files incredibly slow. mkfs.ext3 -t ext3 -c -c -b 1024 -i 4096 -I 128 -v -j -O sparse_super,filetype,has_journal /dev/sdb1 Thanks.

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  • Would SSD drives benefit from a non-default allocation unit size?

    - by davebug
    The default allocation unit size recommended when formatting a drive in our current set-up is 4096 bytes. I understand the basics of the pros and cons of larger and smaller sizes (performance boost vs. space preservation) but it seems the benefits of a solid state drive (seek times massively lower than hard disks) may create a situation where a much smaller allocation size is not detrimental. Were this the case it would at least partially help to overcome the disadvantage of SSD (massively higher prices per GB). Is there a way to determine the 'cost' of smaller allocation sizes specifically related to seek times? Or are there any studies or articles recommending a change from the default based on this newer tech? (Assume the most average scattering of sizes program files, OS files, data, mp3s, text files, etc.)

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  • High system cpu load (%sys), system locks

    - by Mark
    For the last two weeks we are having intermittent severe spikes in system cpu usage (shown as %sys), which last for maybe half a minute, locking most processes, including ssh. I've been trying to figure this out, but atop doesn't show anything relevant (system usage for processes it shows is insignificant), spikes are intermittent and I could not reproduce the spike using any workload for the web application this webserver hosts. If you have any ideas on how to debug high %sys and (sometimes) %si CPU usage, please share them. System specs (don't know if any of this is relevant): Dedicated server, CentOS 6, core i7 950, consistent 4 to 8 GB RAM free at any time, hard drives are in RAID-1. Additional info: dmesg output doesn't change between spikes /var/log/messages doesn't change between spikes Here is cat /proc/vmstat Here is output of mpstat 1 during a typical spike Add 07.11.11: looks like simple reboot restored system state, and we might never know what caused the disturbance in first place.

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  • Three disk (possibly RAID) data recovery

    - by Martin
    I have on my desk three 160 GB disks that were once part of an HP Proliant Windows 2003 Server. They may have been part of a RAID configuration of some sort. They may or may not be damaged in some way. When I interface them via USB, one of them shows up as a drive, but unformatted. The others show up as uninitialized disks in manager. An alternative explanation is that the two drives were simply not unused. What's my first step? I've recovered data off damaged drives before but never had anything to do with RAID configs. How can I even tell if any type of RAID was used?

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  • Why is my computer running slower after I just installed more RAM and a new HDD?

    - by hopla
    I just bought 4 GB of ram (2x2GB) and a 1TB hard drive and installed them, upgrading from my original 1GB RAM and 250GB HDD. I put the 2GB sticks in 1st and 3rd slots and the 1GB stick in 2nd. Now with my new ram and HDD my computer is running MUCH slower and I dont know why. I've tried restarting just to see what happens and I noticed that even the Windows XP starting music is lagging. If anyone could help that would be fantastic. It's hard even to type this out.

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  • Resize a new database to predicted maximum size

    - by John Oxley
    Currently I have a SQL Server database which is about 2 Gb. I know over the next year it's going to grow to a maximum of about 10Gb. Hard drive space is not an issue in the slightest. Is there a down side to resizing the datafile to 20Gb now, then defragmenting the hard drive? Should I resize the log file to 1Gb as well? Something ridiculously large so that fragmentation doesn't happen there either. With this question I would like to avoid the datafile becoming fragmented on the disk itself, but I don't want to negatively impact performance.

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  • Will readyboost speed up a secondary partion or harddrive?

    - by Sebastian
    I'm building a new computer and plan on using a few spare USB sticks with readyboost to cache disk writes. I'll be running Windows 7 Enterprise SP1 x64 I have a single 2 TB disk, and plan to make a partition for windows (100 GB) and use the rest for data. I know Readyboost will work nicely for the C drive, but am unable to find any information on whether it will accelerate a second drive or partition. Just to clarify, I'm NOT trying to use the harddrive instead of the usb sticks. I'm trying to speed up the second partition using the USB sticks So, will readyboost work for a secondary partion or harddrive?

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  • How do I restore a Windows 8 iso image to a USB disk in OS X?

    - by duci9y
    I am on OS X and have a Windows 8 Consumer Preview x64 image. My computer doesn’t have a CD drive (MacBook Air). I have a 4 GB USB drive. I want to restore that image to the USB drive. There are many tools to do that on Windows, but I can’t finger out how to do it in OS X. Please note that I can’t run a VM, as my Air is a limited use machine. What I’ve tried: Simply restore to USB. Convert the image to img and use dd. These don’t work. How do I go about doing this?

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  • Windows 8 freezes on startup when intel VT-d is enabled

    - by John Nevermore
    I don't know what to make of this situation: Windows 8 freezes after about 3 seconds after booting to the log in screen. The only way i have been able to avoid the freeze, is if i set VT-d disabled VT-d enabled, but Nvidia drivers uninstalled (running on integrated graphics) VT-d enabled, Nvidia drivers installed, Hyper-V feature enabled My goal is to get Windows 8 running with VMWare (ie. Hyper-V has to stay disabled), VT-d and the latest NVidia drivers. Specs: 32 GB of ram Intel Core i7-2760QM NVidia Quadro 1000M Intel 520 SSD 480GB Maybe somebody has experience with this kind of a situation ?

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  • Prioritize file sharing capabilities in Windows Server 2008

    - by cmbrnt
    I've got a server running Windows Server 2008, and use it mainly for sharing files throughout the domain from a number of disks. It's running on VMware ESXi 4.0, in case that matters. My problem is that when I log in to the server to check user permissions etc, the access speed the files on the remote disks almost grinds to a halt. I havn't been able to measure the speeds, but I would guess it slows down to about 100kB/s as soon as I log in. This is on a gigabit network and the problems are equal for all users, even the ones connected to the same switch as the server. I've assigned 2 GB RAM to the server, and reserved it 1,5Ghz processor power. I don't have to do anything special on the server for this halt to occur. How can I make sure file sharing is prioritized on the server, so no matter what applications I'm using it will always make sure file sharing works properly? Could this be a VMware issue?

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  • Does it exists a way to do a (software) switch between DVI and VGA screens?

    - by gogolb
    I'd like to know if there is a way (a software, a keyboard combination, etc...) to switch between DVI and VGA screen on the same monitor. I've two PCs connected to the same monitor, far away (80cm) from me. To push the monitor button is not so easy and comfortable as could seems, moreover if you have to do it almost 20 times a day. I've tried to check on search engine/Samsung (SyncMaster SA450) site for a solution but with no success. Any suggestion? Thank you all in advance, gb

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  • Too Many ESTABLISHED connection from a single IP address in Apache

    - by ananthan
    netstat -ntp |grep 80 shows too many ESTABLISHED connection from single IP address. Around 300 of them and it is not an attack and user is using a 2G connection to access Apache. This is the case with other 2G connections also. As a result of this Apache is running out of children. Earlier it was showing too many close_wait and after enabling tcp_tw_reuse and tcp_tw-recycle there is not much close_wait but the number of ESTABLISHED connections increased. We are using Ubuntu 11.04 having 48 GB ram keepalive On keepalive timeout 10 max clients 800 max-request-perchild 4000 timeout 300 I have set syn_ack to 1 and syn_retries to 2. On wifi there is no such issue. Connections are closing properly, but with 2G connections Apache is running out of children and too many ESTABLISHED connection. also i have tried setting timeout from default 300 to 30,but since our project is image hosting for mobile phones,clients couldn't upload images properly as they are getting frequent time out.Also there were a lot of 408 messages so changed it to the default 300

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  • need help setting up a VPN for remote computer connection

    - by Chowdan
    I am on a low budget right now. I am currently in the process of starting a computer company. I am in need of a VPN network so I can run Dameware tools for working on customers/partners computers remotely. I will be working with Windows and some Apple and linux machines. I have desktop with an AMD Phenom II 965BE(currently running stable at 3.8Ghz) processor with 8 GB of ram and a radeon hd 6870(i know graphics aren't too useful) and about 1.5TB of HDD space. I am attempting to create a network out of my office based all on one machine that would also be secure for me to remotely connect to my partners computers so when they have issues I would be able to connect and do the diagnosing and repairs remotely. What types of servers besides a VPN server would i need to create this? I have access to all Microsoft products so I can run Windows Server 2012, Windows Server 2008 R2, or any other Microsoft Software. thanks for the help all

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  • how to reduce size (disk space) of windows 8?

    - by humanityANDpeace
    This questions is about what things I can do to reduce the size that Windows 8 uses. Background For example: At present and with only one programm installed (MS Access 2007) I have a about 15GB of my harddisk space used. I have little space (its a 17 GB partition on a SSD disk). I would like solutions that are like: Remove files not really needed (drivers not actually needed in the system) Help files not really needed (documentation) pagefile.sys (assuming I would have 4GB ram and no real need for swaping) hiberfil.sys (used for hibernate and sleep... I need that. though I would regain about 4GB space) At best I would like to delete mostly files that I would most likely not need. Though I have no good idea where to start there. Since my setup (hardware will not change) I would be willing to delete all the drivers that windows 8 has for hardware I do not have.... The question is about ways to reduce the space that Windows 8 uses.

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  • Previous Versions delayed with SBS 2008 / Windows 7

    - by indeed005
    The SBS 2008 at this site has Previous Versions enabled on a mapped drive. The snapshots happen 3 times a day. I doubt they take very long; the diff size is only a few GB. The problem is that the users on Windows 7 cannot see their previous versions until a few hours later. Is there some indexing that has to happen before the Previous Versions are visible to the client machines? Edit: In the application log, 3 minutes after every scheduled backup, there is an event for VSS (EventID 8224) saying "The VSS service is shutting down due to idle timeout" Apparently this means it has finished successfully, even though modified files still do not show another version.

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  • How would I Enable FTP on Home PC (Win7)?

    - by jp2code
    In my home, all PCs connect through a small router. Some wired and some wireless. Our Media PC (HTPC) is controlled via a Media Center TV style remote, so managing files on it is tedious. I can access all of the files on the HTPC from my desktop PC, but moving a 6 GB file from \\HTPC\Folder1 to \\HTPC\Folder2 involves copying the data to the desktop and then transferring it back. If I were on the HTPC, this would likely be handled by a simple address change for the file (i.e. it would be done almost instantly). I'm thinking if I could get an FTP program to connect to the HTPC, I could simplify things ...but how do I enable that ability on the HPTC? Then, how would I go about connecting to the HTPC? Would I simply enter \\HTPC as the FTP address?

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  • WD 1TB Passport Essential not working on some USB ports

    - by user143863
    I have a strange situation here. I got a new Toshiba P850/04P laptop, there are 4 USB 3.0 ports, 2 on the right and 2 on the left. When I plug my WD 1TB Passport Essential into the 2 ports on the left, the drive keeps disconnecting and then connecting again, on and off. Sometimes it works well for 1 hour and then disconnects and even shows the "please format your drive" message. What is odd is: this WD 1TB Passport Essential works perfectly on those 2 ports on the right side. It has been working fine on all other PCs and laptops. Another 500 GB WD passport can work with the USB ports on the left (the ones 1TB can not), also all other devices can work with all 4 ports. I am really confused! Does anyone know what the problem could be?

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  • How to set up server to be accessed from mobile devices [closed]

    - by Kgrover
    I need to set up a server that will eventually be accessed from an Android application. I don't have experience with how to go about this, but I've seen MySQL servers (Amazon EC2). I would need to store data on the server remotely (again, from a mobile device) and fetch it to display. What would be the best kind of server to use? I'm guessing I would only need around 50 GB of space. Is it possible to use a network drive and set that up as a remote server with an IP address? I would need to upload and extract data through java on Android. This is my first question on ServerFault, and I'm not sure if it's the appropriate forum. If not, please redirect me.

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  • Boot from Recovery partition in Sony Vaio Laptop with no imagex

    - by user302787
    I have visited more and more pages in internet and read lots of solutions but no one solved my problem. I have my 10 GB win7 recovery partition in my Hard Disk but when I press the F10 button it was not booted from this partition (I use this method to recover my laptop several times recently). So How can I boot from my recovery partition? I copied the partition into a flash drive and tried to boot from usb but it does not take effect. I think if there is a way to recover the F10 button functionality, I can recover my laptop.

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  • Installed Ubuntu on usb drive, now it's read-only and can't be formatted

    - by weiszam
    I installed Ubuntu (ubuntu-13.04-desktop-amd64) on a 8 gb pendrive. Because it worked pretty slow, I wanted to change it back to a normal pendrive. But this is what happened. Windows7 can't open the usb drive, can't view files or anything, can't access attributes. When I select to format, it says it can't format it because it is write-protected. Tried the same running from an Ubuntu, and trying from a booted GParted thing. When I view the partitions, they can't be deleted either. What should I do to get it formatted?

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  • how to recover data from my disk - I accidentally copied with dd an iso on it

    - by sijoune
    I wanted to create a bootable usb from an iso image and i accidentally put as the output of the dd, instead of my usb drive, one of my hard disks. The iso was 3,3 GB and my disk is 1TB! And it was almost full. Can i at least restore the data that has not been overwritten? Right now i can't even mount it. I get this error: Error mounting /dev/sdd1 at /media/main/UDF Volume: Command-line `mount -t "udf" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,iocharset=utf8,umask=0077" "/dev/sdd1" "/media/main/UDF Volume"' exited with non-zero exit status 32: mount: wrong fs type, bad option, bad superblock on /dev/sdd1, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so Also since i know which filesystem my disk used if i reformat it to this filesystem is there any chance i can mount it and retrieve the rest of the files?

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  • How to make one CPU to be used simulataneously be three different users

    - by beginning_steps
    As a bootstrapping start-up we are thinking of saving on the IT hardware cost by making more use of the hardware that we have. As a solopreneur I have a laptop config : intel core2duo processor, 3Gb RAM and 250 GB RAM. Now we are planning to increase our team to 3 members. Will like your suggestions on the nest cost-effective step that I can take so that I can use the computing power of the existing laptop to act as a kind of server and then buy to more monitors where the new recruits can do the daily work on and they need to have different login id and access and they dont need access to all the files/applications as are available in my laptop. We use internet intensively to do our day to day activity. Please share you experience, whether you think this is a good ploy or there is any other more effective way of achieving the same result.

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  • Best virtualization solution for running Linux under Mac OS X?

    - by grumbles
    I'd like to run a virtualized Ubuntu instance under Mac OS X (10.6). I've used VirtualBox in the past, but am looking for something that will be faster, and don't mind paying for either Parallels Desktop or VMWare Fusion. Does anyone have experience running Linux guests under either or both programs? I'm primarily interested in doing software development on the Linux guest installation, but I'm also very concerned with the performance and responsiveness the guest OS. I have a mid-2010 15" MacBook Pro (2.66 GHz i5, 8 GB of RAM, NVIDIDA GeForce GT 330M). Thanks!

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