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  • Setting reply priority on Wifi network with QoS?

    - by Omega
    When using a Station and Access Point that support QoS over Wifi, is it possible to set the priority (= Traffic Identifier = TID = QoS channel) of the reply? For example when sending a ICMP ping request using a high priority (= QoS channel), is it possible to force the station to use that same priority (= QoS channel) when sending the reply? A related question: Is it possible to force the station into using a different QoS channel?

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  • Any reasons to avoid using Windows XP Themes?

    - by bporter
    There are so many cool themes out there for Windows XP. I'm interested in trying some out, but I wanted to check with the SU community first: Assuming you download and install a theme from a "trusted" source, do you find they tend to degrade system performance, cause issues with various GUI applications, etc.? Or, do you find they do not really affect your system in a negative way?

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  • Hardware RAID Controller Support for SSD TRIM

    - by dss539
    Do any hardware RAID controllers available today support TRIM? If not, do any manufacturers have target dates for supporting TRIM? Should I even care about TRIM for SSDs installed in performance-sensitive workstations? Before you suggest it, yes software RAID would sidestep the issue, but my requirements do not allow software RAID. edit: The answer appears to be "no RAID controllers support TRIM" at the current date.

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  • sqlservr.exe always reading SBSMonitoring.mdf

    - by Bastien974
    Hi, I'm having an issue with my sqlservr.exe which is always reading the SBSMonitoring.mdf, around 50MB/sec. I saw that in Reliability and Performance mmc. I don't think my hard drive love it... and it slows down my server. We have a SBS 2008. I found nothing about it, help me please :) Thanks.

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  • Alternative to Amazon's S3 service?

    - by Cory
    Just wondering if there is good alternative to Amazon's S3 service? I like S3 but the bandwidth cost is high. I looked at CouldFiles from Rackspace but the cost is even higher. I don't mind prepaying or having monthly payment in order to reduce the bandwidth cost greatly. Thank you for any help

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  • Can I compile Passenger (mod_rails/mod_rack) to make a statically linked Apache httpd?

    - by Oleg
    I prefer to disable httpd dynamic module loading on my production server. I've been using mod_jk linked statically into httpd for quite a long time and it proved to be stable. Now I would like to add Ruby Passenger (mod_rails/mod_rack) to my httpd. I wonder if it is possible to link it statically into Apache httpd the same way too? (without producing a huge httpd) If it is, are there any potential pitfalls, safety or performance concerns having both mod_jk and mod_rails within the same executable? Thanks

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  • How common are power supply failures in comparison to hard disk failures?

    - by Adrian Grigore
    Hi, My webhost offers two different types of high availability options for dedicated servers: Redundant hard disks (RAID1) Redundant hard disks (RAID1) plus redundant power supply How common is a power supply failure in comparison to hard disk failure? I know it's not possible to know the exact figures without knowing the exact hardware, but ballpark figures are good enough for me at the moment. Thanks, Adrian

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  • VMWare vmfs vs NFS datastore with vmdk?

    - by CarpeNoctem
    I want to add a new harddisk to an existing VM and want the best performance possible. The new hard disk will exist on an NFS datastore. Currently I did the following: Created new vmdk on NFS datastore Created new lvm partition using fdisk Create new physical volume, volume group, and logical volume (2TB) Created ext3 partition on logical volume Is there a better way to do this? Should I be doing some vmware-ish file system instead?

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  • Disable Crossfire on an ATI HD 5970

    - by cdecker
    I'm trying to create a computation cluster using ATI GPUs. The problem is that I have to disable Crossfire in order to get maximum performance out of the ATI Radeon HD 5970 I bought to get started, but no matter what I do I can't disable it. The problem is that I'd like to run an OpenCL application on the two cores in parallel, but right now they just interfere with each other. Any idea on how to do so under Ubuntu Linux, with ATI Catalyst 10.10?

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  • Monitoring MySQL SELECT/WRITE/UPDATE/SLOW queries in Nagios

    - by imaginative
    There's ways to get performance graphs with several monitoring software packages out there such as ZenOSS. There's a plugin available that will graph MySQL based SELECT/WRITE/SLOW queries in a nice rrd style graph. I'm curious if there is a way to also get similar graphs available in Nagios 3.0? I know Nagios has tools like pnp and can integrate rrd, but is there something readily available that can plugin to monitor those MySQL specifics?

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  • Can an SATA hard drive image be restored onto an SSD?

    - by Bryan Parker
    I'm currently using an SATA hard drive on my primary dev machine, but planning to upgrade to an SSD at some point soon. I use TrueImage on a regular basis to make backups, and to upgrade my harddrive without reinstalling everything. Will I be able to restore and boot onto an SSD? Will there be a performance hit or other issues to watch out for?

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  • RAID options for a LAMP web server

    - by jetboy
    I'm due to set up a LAMP web server with four drives and a RAID controller to act as a web server. The drives are 146Gb SAS, and the machine has two quad core processors and 16Gb RAM. There will be very few write operations to the MySQL database, and I'll be using as much caching as possible to reduce disk I/O. Question is: Would I be better off splitting the drives into two RAID 1 arrays, splitting up sequential and random disk I/O, or would I get better overall performance putting them all in a single RAID 1+0 array?

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  • Keep IIS7 Failed Request Tracing as a sysadmin only diagnostic tool?

    - by Kev
    I'm giving some of our customers the ability to manage their sites via IIS Feature Delegation and IIS Manager for Remote Administration. One feature I'm unsure about permitting access to is Failed Request Tracing for the following reasons: Customers will forget to turn it off The server will be taking a performance hit (especially if 500 sites all have it turned on) The server will become littered with old FRT's The potential to leak sensitive information about how the server is configured thus providing useful information to would-be intruders. Should we just keep this as a troubleshooting tool for our own admins?

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  • What applications can be used in a Red Hat/CentOS cluster?

    - by Sandra
    Hi, When I look at the Red Hat cluster manuals 1 2, they only explain how to install it but not what applications can use it. I am new to clusters, so I don't know these things =) Let's say I want to 3 node high performance cluster; What applications would work with it? Also, how does an application talk to the cluster? Does the application need to have been written to support clusters? Sandra

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  • Intel i7 vs Xeon quad core processor?

    - by jasondavis
    I know the Xeon processors have been around for a long time and are mostly used in servers but I am curious, why do people not use the xeon's in a high performance desktop? As far as I know about the best desktop processor out there now is the i7 line. The i7's and xeons are both quad-core processors, what is the main difference in these? I just saw that the mac pro's are using the quad core xeons instead of the i7's

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  • Script Editor in Snow Leopard painfully slow after adding apps to Library

    - by Kio Dane
    I have four different Macs that I use from time to time, and on each of them I notice a constant: adding more items to AppleScript Editor's Library window slows performance of mundane operations (opening a dictionary, switching between Library window and editor window, scrolling in the Library window, etc). In Leopard, I noticed little to no latency in opening a dictionary in Script Editor, but Snow Leopard's AppleScript Editor kills my productivity by making me wait on it with most UI interactions with the Library window.

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  • How to convert pcm to mp3?

    - by avirk
    I have some .pcm files and I want to convert them on high quality .mp3 format. I tried to find tools by Google search but did not get the right one for me. I will prefer the freeware but if there is not a good freeware then I can also consider the shareware. The pcm format has much large files as I have 200-500 mb so the tool should be able to handle the large files. Please help me regard this problem.

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  • New drivers, now switchable graphics won't work

    - by Glenn Andersson
    I have an ASUS notebook with dual AMD/ATI graphic cards. Before I've been able to switch individual programs in the Vision Control Center from high performance to energy saving and the other way around. But today I updated the drivers using the AMD Mobility to version 12.10, and now every time I try to configure switchable graphics it either shuts down or does not come up at all. I have a new menu item called Global Switchable Graphics settings though. Any thoughts on this?

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  • Tomcat service start issue

    - by Srinivasan
    Hi, I have installed tomcat as service successfully. when i start this from control Panel- administrative tools - services, it tows error like this, The Apache Tomcat 4.1 service on local computer started and then stopped. Some service stop automatically if they have no work to do, for example, the performance logs and alerts sevice. Wat is the error?

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  • How is load average related to CPU utilization?

    - by Kaustubh P
    I am facing a load average of 3 since past 2 days. The CPU utilization is never above 40 % in all cases. Here are some screenshots of Server Density monitoring tool that I use. The process snapshot at the highest peak, @ 0:00 is as follows: And the process snapshot at the peak created at 12:00 is: My question is, even though CPU utilization is not 100 %, why am I facing a high average? PS: All snapshots are sorted by descending CPU utilization.

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  • FreeBSD Listen Queue Overflows - can't increase max queue size

    - by Harry
    I have a decently high trafficked FreeBSD Nginx server, and I'm starting to get a large number of listen queue overflows: [root@svr ~]# netstat -sp tcp | fgrep listen 80361931 listen queue overflows [root@svr ~]# netstat -Lan | grep "*.80" tcp4 192/0/128 *.80 [root@svr ~]# sysctl kern.ipc.somaxconn kern.ipc.somaxconn: 12288 [root@svr ~]# However I can't seem to increase the max listen queue length past 128. I've increased kern.ipc.somaxconn, but it's not changing the max. Am I missing something? Thanks!

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