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• Do SSD hybrid drives perform better than HDD + ReadyBoost flash?

  - by Chris W. Rea

  Seagate has released a product called the Momentus XT Solid State Hybrid Drive. This looks exactly like what Windows ReadyBoost attempts to do with software at the OS level: Pairing the benefits of a large hard drive together with the performance of solid-state flash memory. Does the Momentus XT out-perform a similar ad-hoc pairing of a decent hard drive with similar flash memory storage under Windows ReadyBoost? Other than the obvious "a hardware implementation ought to be faster than a software implementation", why would ReadyBoost not be able to perform as well as such a hybrid device?

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• How do I fake 2 discrete monitors using a DualHead2Go?

  - by Sietse

  I just got a [Matrox Dualhead2Go|http://www.matrox.com/graphics/en/products/gxm/dh2go/] for use with my MacBook Pro. I realise that the reason it works is that it fakes 1 big (wide) monitor. I also kind of depended on the software that came with it to trick OSX into accepting it as 2 monitors. Turns out the support is kind of lame: it just adds shortcuts for maximizing the window to whatever screen you want. And it even gets that wrong, since my dock doesn't auto-hide, but it doesn't take it in account while resizing, causing my window do end up "behind" my dock. (I've made a AppleScript that does the resize correctly, that I'll post below). There's two glaring issues this causes: Full screen (video, etc.) takes up both monitors, and dialogs just pops up in the middle. Is there a way to trick OSX, or at least a way to fix these issues?

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• Lightest Linux Desktop supporting Firefox/graphic browser

  - by Susan Mayer

  I am on Windows and I have a remote server with Ubuntu 10.10. I want to use Firefox or other graphic browser on that remote server. The problem is, the server's memory is only 512MB, so I can install larger desktop environment. I used to use XFCE and NoMachine NX, but they consume too much memory on that Ubuntu server. The only thing I want to use is a graphic browser (for example firefox) on that server. Nothing else. Do you have any good suggestions? Thanks a lot!

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• Synergy client drops and reconnects at UAC dialog

  - by sidran32

  I've been using Synergy for a while at work to connect my XP machine (the host) to my Win 7 laptop (the client). I previously was having issues with using Synergy and the UAC prompt, as described in this question, and have had no issues since, until recently. I upgraded to Synergy 1.4.10 and now am seeing odd behavior whenever a UAC prompt appears on my laptop. When the UAC prompt appears on my laptop, Synergy momentarily drops its connection to my laptop, causing my mouse and keyboard focus to revert to my host machine (the XP machine). After about a second or so, though, the connection gets re-established and I am able to type and use the mouse buttons in the UAC prompt. Once the prompt clears, the connection drops again for a second, and then gets re-established again. Is this something to do with configuration or perhaps should I just chalk it up to a change in behavior in version 1.4.10?

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• NVRAM for journals on Linux?

  - by symcbean

  I've been thinking about ways of speeding up disk I/O, and one of the bottlenecks I keep coming back to is the journal. There's an obvious benefit to using an SSD for the journal - over and above just write caching unless of course I just disable the journal with the write cache (after all devicemapper doesn't seem to support barriers). In order to get the benefits from using a BB write cache on the controller, then I'd need to disable journalling - but then the OS should try to fsck the system after an outage. Of course if the OS knows what's in the batter-backed memory then it could use it as the journal - but that means it must be exposed as a block device and only be under the control of the operating system. However I've not been able to find a suitable low-cost device (no, write-levelling for Flash is not adequate for a journal, at least one which uses Smartmedia). While there's no end of flash devices, disk/array controllers with BB write caches, so far I've not found anything which just gives me non-volatile memory addressable as a block storage device.

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• Tuning (and understanding) table_cache in mySQL

  - by jotango

  Hello, I ran the excellent MySQL performance tuning script and started to work through the suggestions. One I ran into was TABLE CACHE Current table_cache value = 4096 tables You have a total of 1073 tables. You have 3900 open tables. Current table_cache hit rate is 2%, while 95% of your table cache is in use. You should probably increase your table_cache I started to read up on the table_cache but found the MySQL documentation quite lacking. They do say to increase the table_cache, "if you have the memory". Unfortunately the table_cache variable is defined as "The number of open tables for all threads." How will the memory used by MySQL change, if I increase this variable? What is a good value, to set it to?

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• Does shutdown idle VMs improve the performance?

  - by Samselvaprabu

  Often our team members are coming to me with a compliant that their VMs are slow. Our team members suggested to shutdown some of the VMs temporarily and try to access the VM. But most cases that would not help. Assume that i have assigned 4 GB for and 2 CPUs for my VM. So ideally it should not face performance issue. As our ESXi 4.1 server has multiple VM in the same server (we have overcommited memory and CPU). Does shut down other VM really helps to improve performance or not? [Note : We are using ESXi 4.1 and our hardware is R710 server. We have more number of VMs in single server so we have overcommited memory.]

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• Why is mcrypt not included in most Linux distributions?

  - by Daniel Lopez

  libmcrypt is a powerful encryption library that is very popular with PHP-based applications. However, most Linux distributions do not include it. This causes problems for many users that need to download and compile it separately. I am guessing that the reason it is not shipped is related to encryption or patent issues. However, the source code for library itself is hosted and available on sourceforge.net I have been searching unsuccessfully for a document of authoritative post that explains the exact issues why this extension is not bundled with mainstream distributions. Can anyone provide a pointer to such material or provide an explanation?

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• Office 2007 network share access denied

  - by Rodent43

  Hope I have not duplicated an issue already posted but I could not find anything from the search... Right here is the problem, we have recently updated all our desktops to the MS Office 2007 suite and people have issues trying to open simple files like word documents... the systems are Windows XP (SP3) Novell Network with novell client Office 2007 when they try to open a word document from a usual network share word presents a message reporting Access Denied Contact Administrator So we assumed network permissions, none of which have changed...so try the same file with Wordpad and it opens fine, be it with formating issues of course... Now copy the file to your desktop, which is not redirected, and you can open the file in word as normal... so does anyone know if office 2007 uses some new permission when opening files? does it create temps or something... any pointers would be appreciated

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• OOM-Killer called every now and then..

  - by SpyrosP

  Hello there, i have a dedicated server where i've installed apache2, as well as Rails Passenger. Although i have 2GBs of RAM and most times about 1,5GB is free, there are some random times when i lose ssh and generic connectivity because oom-killer is killing processes. I suppose there is a memory leak but i cannot find out where it comes from. oom-killer kills apache2, mysql, passenger, whatever. Yesterday, i did a "cat syslog | grep -c oom-killer" and got 57 occurences ! It seems that something seriously destroys the memory. Once i reboot, everything comes back to normal. I suspect that it can be related to Passenger, but i'm still trying to figure it out. Can you think of anything else, or do you have anything to suggest that will make the leak identification procedure easier ? (i was even thinking of writing a bash script, to be run with cron for like every 5 minutes).

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• How to troubleshoot intermittent and irregular connection errors on home network (preferrably Mac client)

  - by Martin

  Hi, I'm experiencing intermittent connection errors in our home network from two different computers, normally "Connection Reset" when browsing, but also other issues such as very slow throughput. I have approximately a network setup as below: ISP-Cable Modem-Dlink DIR 655 Router-(Ethernet)-Fon Router-Mac/Windows laptop Basically, is there a simple way to monitor the network and detect where issues are coming from? Right now we don't know if it is the Fon router, the Dlink router, the modem or the ISP. As the issue is intermittent, is there a software that regularly traceroutes a set of destinations and tests e.g. throughput, something that can help us figure out where in the chain the errors are introduced? The more automatic network monitor, the better.

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• Problems with merge replication

  - by jess

  Hi, We are developing a multi-user desktop application with users located in different countries. The platform is - .net 3.5, SQL Server 2008, WinForms. Now, my client has used the help of a DBA who has implemented merge replication. To facilitate replication, we made all our primary keys as GUID. Now, we are facing these issues with replication - subscribers expiration sometimes stops replication and we have found no clean way to re-add every change to db schema requires to poll the whole data all over again! This seems to be strange, what could be the problem here? Also, sometimes we have duplicate keys, and that too stops replication I am sure these issues can be resolved. Maybe, we have not gone the right way to implement. Can you suggest how to go about implementing. Or, is the above information enough to diagnose the problem?

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• upgrading my computer system for office use

  - by denise ellul

  Presently I have the under-mentioned computer system. What should be changed and upgraded with the following products that I own presently? I am interested in performance issues related to cache memory, bus speed, RAM, CAS latency as well as other considerations. Thanks for your help. Processor (CPU): Intel Celeron Dual Core E3300 2.5 GHz Motherboard: Asus P5QPL-AM G41 Main Memory (RAM): 2 GB Team Elite DDR2 PC8000 Case: Coolermaster RC330 Power Supply Unit: 500W EZ-Cool Standard Storage Device (Hard Drive): 500GB Samsung Video Card: Intel GMA X4500 (On-board) Optical Drive: LG GH22NS50 Sound Card: AC 97 (On – board) Card Reader: Akasa Black TFT Monitor: 19” View Sonic Speakers: Logitech S120 2.0

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• Problem with Xen, xvda and sda

  - by Javier J. Salmeron Garcia

  I am creating a cloud for my university using Eucalyptus with Xen (PCs have Debian Squeeze 64 bit installed). I have a problem with the following guest configuration: # # Configuration file for the Xen instance evenmorefinalfoo, created # by xen-tools 4.2 on Thu May 26 11:03:06 2011. # # # Kernel + memory size # kernel = '/boot/vmlinuz-2.6.32-5-xen-amd64' ramdisk = '/boot/initrd.img-2.6.32-5-xen-amd64' vcpus = '1' memory = '128' # # Disk device(s). # root = '/dev/sda2 ro' disk = [ 'file:/home/xen/domains/evenmorefinalfoo/disk.img,sda2,w', 'file:/home/xen/domains/evenmorefinalfoo/swap.img,sda1,w', ] As you can see, the disk and swap images are meant to be mounted on sda1 and sda2. However, when I start the guest, these are mounted on xvda1 xvda2, provoking an error. Is there anything that I can do about that? It seems like it is a Xen error. Thank you in advance,

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• Installed over 4G RAM on 32-bit OS? [closed]

  - by kai

  Possible Duplicate: 32-bit Windows Server address > 4GB RAM - How? I know that for 32-bit OS, the addressable memory space for each process is "4G" (maybe just 3G in user space...). If I have a 8G RAM, is it correct that all of the processes can still utilize (shared) these 8G memory but each of them are limited to a maximum 4G? Or the whole system only can see and utilize 4G out of 8G and thus having 8G RAM on a 32-bit OS is the same as having 4G RAM on it?

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• Harvard vs. Von Neumann architecture

  - by user32569

  Hi. Our teacher told us, that Harvard architecture is the most evolved and produced architecture today and towards future. but I thing becouse os massive averhead of x86 and Von Neumann nased ARM systems that actually Von Neumann is the most used architecture today. Yes, MCUs with Harvard are even more produced, but since they all have just minor purpose (compared to x86 and ARM based) that Von Neumann is actually the one. Or is it really Harvard? And second, I know this is strange question, but does any architecture combining both exists? to have separate memory for data and programs, therefore faster instruction processing, but still able to work with these as Von Neumann? To be able o load amd unload programs to program memory on the fly? Isnt this the way the x86 should have go? Or would there be some bottleneck that pure Von neumann solves? Thanks.

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• Wiki on a pendrive - should work with any OS

  - by Florian Pilz

  Hello, I want to have an "extended memory" and want to accomplish that with an wiki on an pendrive. I already decided to use PmWiki, but if another wiki solves my problem that would be fine. The issue is: If I install an Apache on an pendrive, it depends on the running operating system. Because I'm using Windows & Linux (and will use Mac in the future) it is crucial for me to be platform independent. I read this article. DokuWiki is for Windows only and MoinMoin needs Python installed (which would be possible on my PCs, but not on public ones). Every help for my "extended memory" is appreciated. PS: As a last resort I could host a wiki on my webpage, which would be accessible everywhere. But I just see a challenge in trying it on a pendrive.

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• Why FreeBSD won't reboot after kernel crash?

  - by Max Kosyakov

  Once in a while I get my server running FreeBSD 8.0 amd64 fail due to bad memory (incompatible with motherboard) modules. Each time it happens, the box stalls with the last note saying that it will automatically reboot in 15 second, but it never does. How do I fix this? I need computer to reboot after kernel crash, unattended. (Please do not recommend to replace memory, as soon as I get the modules, I will, but I need a quicker solution that will not require me to stand still next to the box just to press the reset button each time it crashes.)

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• Why is the server performance so poor? What can be done to improve the speed of the server?

  - by fslsyed

  Very slow processing using Windows Server2008 R2 Standard with Service Pack One. Situation: Read a text file using the text data to populate a series of MS Sql tables. The converted data is used to generate monthly PDF invoice files; the PDF files are saved directly to the hard drive. The application is multi-threading with one thread used for the text conversion and three threads for PDF invoice generation. The text conversion is occurring concurrently with the invoice generation. Application Software: C# using Microsoft Visual Studio 2010 Ultimate. Crystal Report Writer 2011 with runtime 13_0_3 64 bit version. Targeted platform is x64; also tested as x86, and Any CPU with similar results. Microsoft .NET Framework 4.0. Microsoft Sql 2008 Issue: The software is running very slowly. The conversion of the text file is approximately six hundred fifty records per second and generation of the PDF files is approximately twelve invoices per minute. The text file to be converted is six hundred Meg with seven thousand invoices to be generated. The software was installed on three different machines from the same distribution files. The same text file was converted on each machine. The user executing the application was an administrator on each machine. The only variances were the machine and operating system. The configurations are as follows: Server: Operating System: Windows Server2008 R2 Standard 64-bit (6.1, Build7601) SP1 Service Pack: System Manufacturer: IBM System Model: System x3550 M3-[7944AC1]- BIOS: Default System BIOS Processor: Intel® Xeon® CPU E5620@ 2.4GHz (16 CPUs) Memory: 16384MB Notebook: Operating System: Windows 7 Home Premium Standard 64-bit (6.1, Build7601) System Manufacturer: Hewlett-Packard System Model: HP Pavilion dv7 Notebook PC BIOS: Default System BIOS Processor: AMD Phenom II N640 Dual-Core Processor 2.9GHz (2 CPUs) Memory: 6144MB Desktop: Operating System: Windows 7 Professional 64-bit (6.1, Build7601) SP1 System Manufacturer: Dell Inc. System Model: OptiPlex 960 BIOS: Phoenix ROM BIOS PLUS Version 1.10 A11 Processor: Intel Core™2 Quad CPU Q9650 @3.00GHZ (4 CPUs) Memory: 16384MB Processing results per machine: The applications were executed seven times with the averages being displayed below. Machine Text Records Invoices Generated Converted Per Minute Per Minute Server (1) 650 12 Notebook 980 17 Desktop 2,100 45 (1) The server is dedicated to execution of this application; no additional applications are being executed. Question: Why is the server performance so poor? What can be done to improve the speed of the server?

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• Mavericks Dock Lag

  - by Syle

  Im having an weird bug on my MacBook Pro. When I start the machine, the dock have some graphic lag, the same when I open and close windows. The solution is simple, just open the AutoCAD and close it and the bug is gone. The same if I open AutoDesk Maya or other similar 3D program. My question where is not how to fix it, but why it happens. Its like Mavericks on the start thinks: Well you can only use a little memory of the graphic card! But if i open AutoCad, its like: Oh you are opening AutoCad so its better starting boosting the graphic card and giving you more memory. I bet there is something that is forcing Mavericks to think like this. Any help is welcome! =)

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• IIS Reverse Proxy support for multiple protocols

  - by Abraxas

  I have a server 2012 machine running IIS. It's in my DMZ and I would like to use it to do reverse proxy for several services. I can get it to route traffic on port 80 to 2 separate internal servers running web apps but there are some issues when I try to forward SSH (not port 80/443) and then when I try to forward OWA (Micrsoft exchange's 'webmail' services) to the internal mail server I run in to issues with guides (like this: http://blogs.technet.com/b/exchange/archive/2013/07/19/reverse-proxy-for-exchange-server-2013-using-iis-arr-part-1.aspx) when they say to have all traffic forwarded to the server farm created for OWA. My question for you all is this - given that there is no more Threat Management Gateway (only runs on server 2008) and ISA 2006 is also dead - is it possible to support multiple types of reverse proxies with different protocols (ftp, ssh, web, ssl-web) in IIS, or would it be better to install a different DMZ OS like a nginx server and use linux firewalls + nginx reverse proxy? Thanks for any help!

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• Outlook Security Alert following Exchange 2007 upgrade to SP2

  - by desiny

  Following an update to Exchange 2007 sp2 (yes I know very belated) I have an issues when logging onto Outlook. I see the below message... I also had a simlar issues with web access and as I am at home with IIS, this was easily solved. However I did notice that the server contains a number of keys for autodiscover.mycompamy.com, exchange.mycompamy.com etc and it seems that the SP2 upgraded didnt know how to deal with this. As I have a wildcard ssl, I think it would be prudent to remove all other certificates, however in order to stop the nag when opening outlook - what can I do?

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• Sun Grid Engine (SGE) Jobs Not Visible After Adding virtual_free

  - by Gary Richardson

  I'm trying to to use virtual_free to limit the number of large memory jobs running each grid node in my cluster. This seems to be working as expected. After I modified my code to submit jobs with the memory instances, qstat -f -q $queueName no longer shows a list of jobs waiting for a slot. The jobs are submitted with a specific queue (-q $queueName). I'm guessing this is happening due to the magic of SGE queue selection. Is there a way to make my jobs show up as before? Thanks! UPDATE I'm using: qstat -f -u * -q $queueName to view the queue. If I drop the queue argument, I can see the jobs. If I examine a specific job, I can see that it has the correct hard_queue_list value set. I'm also using Sun Grid Engine 6.1u4

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• Is it safe to run an operating system from an USB flash drive?

  - by Georg

  I've got a laptop that has a broken harddisk controller. Replacing the motherboard is quite expensive. I thought about buying a flash drive and installing & running the system from it. However, I'm concerned about some things. Speed: Are they fast enough for swap memory (I've got only 1GB RAM installed.) I'm considering buying 2 or 3 of them and making them into a RAID. What about limited write cycles? How long will it last for a system that has a filesystem with journaling enabled? I'd hate to abandon it. Are there significant differences between internal SSD which are used in modern laptops like MacBooks and USB flash drives? What should I expect in 10 years when the memory wear starts kicking in?

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• What can cause peaks in pagetables in /proc/meminfo ?

  - by Fuzzy76

  I have a gameserver running Debian Lenny on a VPS host. Even when experiencing a fairly low load, the players start experiencing major lag (ping times rise from 50 ms to 150-500 ms) in bursts of 3 - 10 seconds. I have installed Munin server monitoring, but when looking at the graphs it looks like the server has plenty of CPU, RAM and bandwidth available. The only weird thing I noticed is some peaks in the memory graph attributed to "page_tables" which maps to PageTables in /proc/meminfo but I can't find any good information on what this might mean. Any ideas what might be causing this? If you need any more graps, just let me know. The interrupts/second count is at roughly 400-600 during this period (nearly all from eth0). The drop in committed was caused by me trying to lower the allocated memory for the server from 512MB to 256MB, but that didn't seem to help.

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