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  • HD failure questions ...

    - by JP
    I recently had one of my home PC hard drives fail. It was in a striped raid, so I had to rebuild the raid (no data lost, only the OS partition was there). Is there any way to diagnose exactly what went wrong with the drive? That is what caused the failure? Also, in general, what is a good way to dispose of a failed hard drive securely and realistically (I don't have thermite or muriatic acid)?

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  • Firewalls: What is the difference between Policy, NAT and Routes?

    - by Jakobud
    I'm learning fwbuilder and firewalls in general. I don't understand the differences between Policy, NAT and Routes. They all seem like they are just ways to tell the data where to go depending on what it is and where its coming from. What is the real difference? Is a properly configured firewall taking advantage of all three (Policy, NAT and Routes) or are they just three different ways to accomplish the same thing and you only need one of them?

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  • Why should I choose either PCL or PS when both are supported

    - by Goyuix
    Obviously the answer depends to some degree on the various versions supported, but in general terms - is there any reason I should pick one over the other? PCL for art and PS for text? Does one typically require less RAM on the printer? Speed differences? For home use it doesn't matter and only professional print people will notice and care? Wikipedia References: http://en.wikipedia.org/wiki/Printer_Command_Language http://en.wikipedia.org/wiki/PostScript

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  • overriding default scheduler for blkio requests in cgroups

    - by Aamir Mushtaq
    I am trying to optimize a set of servers that have to reside on single machine. i.e. i can have multiple application server, a DB server and of course a samba server as well in same instance. Now I was looking into several optimizing options available to me. In my quest, i did my tuning of the network stack. coming to the CPU, MEMORY and the BLKIO tweaks, i am using CGROUPS. The problem i am facing is that for enhanced performance in the nature of the applications that i am running, the CFQ Scheduler that is implemented for the BLKIO subsystem is not optimal. I was looking more for a Deadline Scheduler because that will serve my purpose well. My question is whether it is possible for us to change the scheduler in the kernel compilation itself for the BLKIO to Deadline and it will reflect in my usage of [CGROUP hierarchies][3]? Since when running the service cgconf, a new fs is mounted and i dont want it to revert to CFQ scheduler. I also welcome any suggestions that will enable me to have more control over my resources.

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  • Keyboard and monitor recommendations

    - by Dmn
    I'm about to get a 23" monitor to connect to my laptop for programming, and general multimedia besides. This is the monitor; what do you think? Also, would you recommend getting a keyboard to use instead of the laptop's one? It seems like it would be awkward otherwise. This is the keyboard I'm looking at because it seems to have the low laptop style keys. Would you recommend something different?

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  • putty external text editor?

    - by matthewsteiner
    I'm new to ssh and linux in general. I've got putty set up and I can connect to my server and list files and everything. I'm wondering how I can edit a file using notepad++ (or another editor). Is there a way to have it automatically download and upload through ssh? How else do you edit a file? Thanks

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  • Slow Local Network, Windows 7, Snow Leopard, WiFi/Wired

    - by WerkkreW
    I am experiencing really poor local network performance in my home. I was recently using a Linksys WRT54G Router with DD-WRT on it, and a couple comparable Linksys-G PCI cards for connectivity but decided to upgrade hoping it would help with my performance issues. The computers in my house are connected as follows: Comcast Business Class Commercial 25mbps/10mbps (Verified) D-Link DGL-4500 Wireless N Router Windows 7x64 - D-Link DWA-552 Wireless-N Windows 7x64 - D-Link DWA-552 Wireless-N Mac Mini 10.6.2 - AirPort Extreme N Playstation 3, Hard Wired Xbox 360, Hard Wired Essentially the problem is very specific. Web browsing and uploading/downloading files from the internet is fine, more than fine. But if I want to say, Stream a video from one of my Windows 7 computers to my PS3, or copy a large video file between either of the PC's or the Mac, I get a consistent 500-900Kbps throughput at the high end. If I open my network browser, or try to browse my homegroup the response time is horrible. Both of my Windows computers are showing Strong wireless signals with a connection speed of 300Mbps. I know I can never expect to achieve anything near those speeds, but 500Kbps? Here is what I have tried so far: Enabled Single mode N-only and N/G Only on router WPA2 with AES Encrpytion Disabled "Remote Differential Compression" in Windows 7 Disabled TCP "Auto-Tuning" Used other software for file copies such as "Teracopy" I am at the end of my rope. Unfortunately I live in a 75 year old home with plaster walls, so hard-wiring my entire house isn't really an option I can handle right now. Any ideas to help me get decent speed when transferring files across my network would be greatly appreciated.

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  • Caching all files in varnish

    - by csgwro
    I want my varnish servers to cache all files. At backend there is lighttpd hosting only static files, and there is an md5 in the url in case of file change, ex. /gfx/Bird.b6e0bc2d6cbb7dfe1a52bc45dd2b05c4.swf). However my hit ratio is very poorly (about 0.18) My config: sub vcl_recv { set req.backend=default; ### passing health to backend if (req.url ~ "^/health.html$") { return (pass); } remove req.http.If-None-Match; remove req.http.cookie; remove req.http.authenticate; if (req.request == "GET") { return (lookup); } } sub vcl_fetch { ### do not cache wrong codes if (beresp.status == 404 || beresp.status >= 500) { set beresp.ttl = 0s; } remove beresp.http.Etag; remove beresp.http.Last-Modified; } sub vcl_deliver { set resp.http.expires = "Thu, 31 Dec 2037 23:55:55 GMT"; } I have made an performance tuning: DAEMON_OPTS="${DAEMON_OPTS} -p thread_pool_min=200 -p thread_pool_max=4000 -p thread_pool_add_delay=2 -p session_linger=100" The main url which is missed is... /health.html. Is that forward to backend correctly configured? Disabling health checking hit ratio increases to 0.45. Now mostly "/crossdomain.xml" is missed (from many domains, as it is wildcard). How can I avoid that? Should I carry on other headers like User-Agent or Accept-Encoding? I thing that default hashing mechanism is using url + host/IP. Compression is used at the backend. What else can improve performance?

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  • Can someone explain what causes extra heat in a CPU

    - by BlueTrin
    I have a hardware question about CPU and chips in general: what is causing the extra heat when CPUs are busy doing computations ? I thought that the CPUs would have a way to throttle themselves when they are not busy but it seems that only applies to some mobile CPUs, so my question is how do CPUs manage to generate less heats when performing less computations and what causes the heat in the hardware when the workload increases ?

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  • SQL Clustering on Hyper V - is a cluster within a cluster a benefit.

    - by Chris W
    This is a re-hash of a question I asked a while back - after a consultant has come in firing ideas in to other teams in the department the whole issue has been raised again hence I'm looking for more detailed answers. We're intending to set-up a multi-instance SQL Cluster across a number of physical blades which will run a variety of different systems across each SQL instance. In general use there will be one virtual SQL instance running on each VM host. Again, in general operation each VM host will run on a dedicated underlying blade. The set-up should give us lots of flexibility for maintenance of any individual VM or underlying blade with all the SQL instances able to fail over as required. My original plan had been to do the following: Install 2008 R2 on each blade Add Hyper V to each blade Install a 2008 R2 VM to each blade Within the VMs - create a failover cluster and then install SQL Server clustering. The consultant has suggested that we instead do the following: Install 2008 R2 on each blade Add Hyper V to each blade Install a 2008 R2 VM to each blade Create a cluster on the HOST machines which will host all the VMs. Within the VMs - create a failover cluster and then install SQL Server clustering. The big difference is the addition of step 4 whereby we cluster all of the guest VMs as well. The argument is that it improves maintenance further since we have no ties at all between the SQL cluster and physical hardware. We can in theory live migrate the guest VMs around the hosts without affecting the SQL cluster at all so we for routine maintenance physical blades we move the SQL cluster around without interruption and without needing to failover. It sounds like a nice idea but I've not come across anything on the internet where people say they've done this and it works OK. Can I actually do the live migrations of the guests without the SQL Cluster hosted within them getting upset? Does anyone have any experience of this set up, good or bad? Are there some pros and cons that I've not considered? I appreciate that mirroring is also a valuable option to consider - in this case we're favouring clustering since it will do the whole of each instance and we have a good number of databases. Some DBs are for lumbering 3rd party systems that may not even work kindly with mirroring (and my understanding of clustering is that fail overs are completely transparent to the clients). Thanks.

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  • SQL Server performance on VSphere 4.0

    - by Charles
    We are having a performance issue that we cannot explain with our VMWare environment and I am hoping someone here may be able to help. We have a web application that uses a databases backend. We have an SQL 2005 Cluster setup on Windows 2003 R2 between a physical node and a virtual node. Both physical servers are identical 2950's with 2x Xeaon x5460 Quad Core CPUs and 64GB of memory, 16GB allocated to the OS. We are utilizing an iSCSI San for all cluster disks. The problem is this, when utilizing the application under a repeated stress testing that adds CPUs to the cluster nodes, the Physical node scales from 1 pCPU to 8 pCPUs, meaning we see continued performance increases. When testing the node running Vsphere, we have the expected 12% performance hit for being virtual but we still scale from 1 vCPU to 4 vCPUs like the physical but beyond this performance drops off, by the time we get to 8 vCPUs we are seeing performance numbers worse than at 4 vCPUs. Again, both nodes are configured identically in terms of hardware, Guest OS, SQL Configurations etc and there is no traffic other than the testing on the system. There are no other VMs on the virtual server so there should be no competition for resources. We have contacted VMWare for help but they have not really been any suggesting things like setting SQL Processor Affinity which, while being helpful would have the same net effect on each box and should not change our results in the least. We have looked at all of VMWare's SQL Tuning guides with regards to VSphere with no benefit, please help!

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  • How to get Google Chrome on my TV for under $100

    - by pattern86
    How can I get the Google Chrome web browser on my TV for under $100? ($200 MAX) I have a TV with HDMI and component inputs (but no bluetooth so firmware modding is out.) I want the solution to work with bluetooth peripherals--I already have a wireless Apple keyboard and Magic Mouse. I don't want a laptop or a desktop computer, unless it's in the general form factor of an HTPC or Mac Mini. Is there a way to make this happen?

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  • putty external text editor?

    - by matthewsteiner
    I'm new to ssh and linux in general. I've got putty set up and I can connect to my server and list files and everything. I'm wondering how I can edit a file using notepad++ (or another editor). Is there a way to have it automatically download and upload through ssh? How else do you edit a file? Thanks

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  • Is there any way to limit the turbo boost speed / intensity on i7 lap?

    - by Anonymous
    I've just got a used i7 laptop, one of these overheating pavilions from HP with quad cores. And I really want to find a compromise between the temp and performance. If I use linpack, or some other heavy benchmark, the temp easily gets to 95+, and having a TJ of 100 Degrees, for a 2630QM model, it really gets me throttling, that no cooling pad or even an industrial fan could solve. I figured later that it is due to turbo boost, and if I set my power settings to use 99% of the CPU instead of 100%, and it seems to disable the turbo boost, so the temp gets better. But then again it loses quite a bit of performance. The regular clock is 2GHz, and in turbo boost it gets to 2.6Ghz, but I just wonder if I could limit it to around 2.3Ghz, that would be a real nice thing. Also there is another question I've hard time getting answer to. It seems to me that clocks are very quickly boosting up to max even when not needed, eg, it's ok if the CPU has 0% load, the clocks get to their 800MHz, but even if it gets to about 5% it quickly jumps to a max and even popping up turbo, which seems very strange to me. So I wonder if there is any way to adjust the sensitivity of the Speed Step feature. I believe it would be more logical to demand increased clock if it hits let's say 50% load. I do understand that most of these features are probably hardwired somewhere in the CPU itself or the MB, which has no tuning options just like on many laptops. But I would appreciate if you could recommend some thing, or some software. Thanks

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  • Safari Plugin/Extension Sites?

    - by Kaji
    Useful as it was when I was running Tiger, the number of broken links and general lack of information on what's compatible with version 4.0+, I've decided it's time to give up on PimpMySafari.com and look elsewhere. Can anyone recommend a similar site that actually keeps its content up-to-date?

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  • What is the difference between "load" and "fetch"?

    - by DragonLord
    I often encounter the words load and fetch in contexts where data are being read from some source, and they seem to have slightly different meanings. What's the difference? I've done some research and couldn't find any specific technical difference in general usage. While the term fetch can refer to one stage in CPU instruction execution, I've seen it used in contexts not related to CPUs, and I'm looking for an answer that is not specific to CPUs.

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  • 2 sets of tabs in google chrome

    - by Ben
    I usually have 2 sets of tabs in google chrome, in 2 windows. 1 for general browsing, and the other for 'work'. Can I get both windows to auto launch at start, populated with their respective tabs? Thanks

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  • How do you google bad reviews? [closed]

    - by zlog
    The first thing I like to do before I make technology choices or gadget purchases is find bad reviews of the things. That way, taking into consideration of the potential biases of the reviewer, I can evaluate the product/service for the worse it can be. How do people google (or search in general) for bad reviews? I usually just try googling "bad review [product/service]" or "[product/service] sucks", but I'm sure there are better ways.

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  • Which is a better graphics card

    - by michael
    Hi, Can someone please give me advice regarding which of the following is a better graphics cards? Radeon HD4650 1GB NVIDIA Geforce GT240M 1GB Or which brand is better in general? Radeon? or Nvidia? Thank you.

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  • How can I see processes running in Windows 7?

    - by Roman
    I found the following sentence: Many Windows-Users may have wondered about the mDNSResponder.exe process running all the time. It’s Bonjour. Does anybody know how can I see these processes (I do not mean "mDNSResponder.exe". I mean in general.). It should be some analog of "top" command in Linux.

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