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• Apache conf for high trafic CMS with backend users?

  - by Annan

  I'm in the situation where a website is going to have a high number of web users and a few backend webmasters. Webmasters will upload images (+other high mem tasks) and this bumps up the memory allocation of the httpd child processes to 100-150mb. In order to stop swapping I'm currently setting MaxClients in httpd.conf to 20. However this lowers maximum simultaneous requests. Will this be a problem when the website goes live? What is the best configuration? Info: Drupal 6, PHP 5, Apache 2.2 (Prefork atm) I'm thinking about Worker MPM, two apache instances or low MaxRequestsPerChild.

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• Dell PowerEdge 6850 Degraded HDD

  - by Matt

  Good Morning, We have a dell power edge 6850 with a degraded drive in the RAID array. I have never had to recover such an issue, so any help or advice would be welcome. Basically it hasn't affected the server at an operating system level, but has slowed down performance, I have a replacement drive in hand but as this is our main database server I want to proceed with extreme caution. My options as I see them are - Can I just hot swap the degraded drive with the new one and the data will automatically re-sync and we are all back to normal presumably this is dependant on the current raid configuration? reading various comments on-line I may need to re-configure the RAID array and re-build the broken drive? This screams disaster to me with the main worry being that I wipe any other data. Option 1 would of course make my day. Thanks in advance

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• changing filesystem format from jfx to ext4 without losing data

  - by A.Rashad

  I have a fresh Lucid Lynx (Ubuntu 10.04) running on a laptop. where I defined the filesystems as: mount point / on ext4 (46 Gb) mount point /home on jfs (63 GB) swap as 3 Gb I left the machine over night to do some task, without AC power supply. next day in the morning I found it on standby, task completed, but filesystem was not reachable. it gave me I/O error it seems that there is a problem with jfs and standby. anyways, to avoid any hassle, I want to move this mount point from jfs format to ext4. can I do this without losing data and without the need to place the data in a temporary location until transformation is done? sorry to mention that, but I recall back in the windows days, we would change a FAT16 to FAT32 or a FAT32 to NTFS without having to lose the data. I hope this is available on Linux.

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• Offset AND incremental backup

  - by Pyrolistical

  I already do backups from my main computer to my server computer using synctoy. But now I also want to do off-site backup. My idea so far: have source hard drive (we'll call S) at home have backup hard drive at work called B have transport hard drive called T connect T at work and record index of files on B take T home and check index of S and note new/changed/deleted files and copy changed files to T take T to work and update S repeat Its basically a sneakernet and using all of the advantages of it. High bandwidth, low latency. Is there some software to do this, or do I have to write it myself?

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• Problem accessing MICROSOFT##SSEE database (Error: 18456, Severity: 14, State: 16.)

  - by Philipp Schmid

  After an unexpected server shutdown due to a power failure, I can no longer connect to the internal windows database MICROSOFT##SSEE which is hosting Central Admin for my SBS 2008 server. The log shows: Error: 18456, Severity: 14, State: 16. Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. [CLIENT: <named pipe>] I've tried to connect using the SQL Management studio (connecting to .pipemssql$microsoft##sseesqlquery) but no luck. The SQL Server Configuration Manager doesn't show a entry for 'Protocols for MICROSOFT##SSEE' (but shows it for 2 other database hosted on the same SQL server 2005 Express edition. I have tried to restore the master.ldf and mastlog.log files from a backup, but the issue persists.

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• Increase the compression performance of VPN

  - by Martin

  I am currently switching from a system with HPN-SSH tunnels and enabled compression to something VPN based. I have tried tinc and n2n so far, hamachi requires a library I do not have. In my primitive benchmarks I am not satisfied with the achievable bandwidth compared to the SSH tunnels. In tinc the low LZO setting performed best, but compression is only available in UDP mode. Ideally I would like to have a TCP-based VPN with a multi-threaded compression. Can you suggest me some ideas how to increase the performance? Would it be possible to somehow put a compression filter in front of the tun interface? Or are there any VPN implementations that might be better suited for my needs (fast compression, TCP-based, switch mode, does not have to be super-secure)? I would consider tunnelling Ethernet over SSH, but according to some articles it is not advisable.

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• automated printouts from a wireless printer

  - by Piotr

  I have a wireless printer which is always on, and an always on fanless linux server. Looking at the mprinter project on Kickstarter I started to wonder if there is an app somewhere in the internet already that will allow to prepare an automated daily printout based on some settings. things to be printed could include - weather forecast for my locations, todo`s scheduled for that day, a "quote of a day" or "word of the day", stats from google analytics for my site, and many more ... I would set a printout at 6:15 every work day so its on my printer when I am already up, having a coffee. anyone knows something that can be used for such purpose? While I know this can be done by combining the power of TeX, cron and a script language to manage the dynamic part of the PDF I believe this is a use case someone has already addressed.

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• Ethernet 802.1x client -> WiFi AP on a Raspberry Pi?

  - by Martin Janiczek

  I have an Ethernet connection that requires 802.1x authentication (TTLS, MSCHAPv2, name+password). My goal is to connect that to something that would then act as an WiFi AP, so I can use the connection on more devices (iPhone, notebook, etc.) Would it be possible/good idea to use Raspberry Pi for this purpose? Or are there better-suited devices to do this? EDIT: found some alternatives but because of low rep can't post more than two links... OpenWRT + wpa_supplicant guide Carambola - works with OpenWRT (but probably not standalone?) Hornet-UB - works with OpenWRT Asus RT-N10+ + OpenWRT how-to

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• Macbook superdrive got calibration problems

  - by Fractal

  I have an intel macbook dual 2Ghz, bought about three years ago. I've had some problems with the superdrive and changed it a year and a half ago. the drive is Matshita DVD-R UJ 857 now I'm into burning cd's again and try to burn a DVD with Toast Titanium from an .iso on my hard drive But it won't work. When I launch the burn, the disc suddenly stops turning, and an error log pops: medium error, sense code = 0x73, 0x03 then I try with the built in cd burner of the macbook as soon as I click burn, the cd stops turning in the drive, and error log says peripheral couldn't calibrate power of the laser required for medium so since I'm not that logical of a geek, I try my first idea: let's see with other brands of DVD! the problem is that it works, now. but I'd like for all of my medium to be usable, and I've already seen my ridata DVD being burn, so here's the question. What the hell is happening with my superdrive? :)

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• Windows 7 upgrade advisor issue

  - by Groo

  I am preparing to migrate a pretty old XP machine to Windows 7. I ran the Windows 7 Upgrade Advisor and got a couple of smaller issues (low 512Mb RAM complaints and similar stuff). Apart from that, everything else was shown as compatible, including my old ATI Radeon 9550/X1050 card: ATI Radeon 9550/X1550 Series: This device is compatible with Windows 7. The thing that concerns me is that people around the web seem to be unable to actually find a Windows 7 driver for this card. Even the ATI web page states that this is a legacy device: If the user chooses to, they can install the ATI Catalyst Windows Vista graphics driver under Windows 7. [...] Using the ATI Catalyst Windows Vista driver under Windows 7 is not officially supported by AMD [...] Should I trust the Advisor and continue with the update? Does this mean Microsoft will provide at least a generic driver which will allow hardware acceleration with this card?

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• Ubuntu 11.04 hangs at "checking battery state" while booting

  - by MisterSir

  When I try to boot Ubuntu 11.04, it just hangs when it gets to checking battery state. I know this issue is usually related to graphic drivers, but it worked like a charm for months now. Last time I was on Ubuntu I updated my system with the update manager, so maybe an update caused it. Anyway, I really need Ubuntu. I'm in the middle of work on a website and I have a deadline, so I need some help over here. Thanks. p.s. I tried reinstalling gnome-power-manager. Didn't work. And I'm not on a laptop.

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• Sharepoint insists it knows the link to my UNC and won't let me remove hyperlink formatting

  - by ray023

  We have a file share at work (one I do not have the power to rename) and it contains a space in it: \\WorkFileShare\Visual Studio\SP1 I'm creating a Wiki Entry that informs users they can locate the VS2010 SP1 download on this Share. For some reason, SharePoint will highlight and hyperlink the UNC up to the space. (I've been dealing with this behavior for years in Outlook and I fix by putting focus on the character before the space and then hitting backspace to remove the formatting). Simple enough and SharePoint also removes the formatting when you backspace on the character before the space. However, as soon as I move away from the link, SharePoint goes right back to highlighting and hyperlinking what it thinks is the UNC. Naughty Sharepoint!! So does anyone have any idea how to clear the formatting? NOTE: Highlighting the text and clicking on the "Clear Format" icon does not work.

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• Windows 7 x64 Hard Freezing (again)

  - by Lanissum

  Awhile ago, my computer was randomly freezing a few minutes after booting, and I ended up replacing the CPU and mobo after testing the RAM and hard drive, I also couldn't find anything wrong with the video card. So after replacing the presumably faulty hardware, everything worked fine for about a month and a half. All of a sudden, My computer is randomly freezing a few minutes after loading up any intensive application (games, mostly). Most of the time it just freezes with the current frame until I hard reset, although once it printed a BSOD message stating that dxgmms1.sys was to blame. The only difference between these two episodes I can think of is that I can do word/internet/work without issue now, as opposed to the near uselessness my computer was rendered last time. For those of you who want to know, I tested my memory with memtest86 (for 64 bit machines). I can't figure out what could have started this latest round of issues, the event logger just states that a kernel-power event has occurred (like last time) but I think thats just a generic "this machine has rebooted after a sudden shutdown" message.

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• Run disk error check on NTFS file?

  - by paulius_l

  I have a feeling that my system hard drive is dying. Benchmark kind of enforces it. Here is the benchmark of my system hard drive during low system activity: And here is the benchmark of backup drive: Furthermore, there are some files which I just can't touch because I get CRC errors and the hard drive activity spikes to 100% with operating speeds less than 1 MB/s while working with such files. I haven't yet tried swapping SATA cable as I have read this might cause the problems. Anyway, I would like to run some tests on specific clustsers where those files I am interested in are stored. I don't want to do the full chkdsk because it takes a very long time. I would like to either find the utility which executes the disk check directly on the clusters where the file belongs or a couple utilities where one tells me the cluster locations and another can check just those locations. How do I check and possibly fix disk errors where the files I am interested in are stored? Edit: S.M.A.R.T. info:

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• Wake up my company computer from a home computer

  - by Darcy

  I would like to learn if it is possible for me to send a packet (a magical one) from another computer to my computer. I am interested in waking up my computer at work from the one I am using at home. That is I would like to power it on at 7:00am by sending it a wake-on packet from the home computer. I have no idea how to carry out this seemingly trivial task, I hope someone could offer some basic ideas for me start. Thank you so much in advance.

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• What does an ACPI BIOS configure during boot?

  - by RJSmith92

  When a PC boots with an ACPI BIOS, what does it exactly do? I understand that the point of ACPI is to allow the OS to control hardware resources and power management but before the OS is loaded does ACPI configure just the devices needed to boot and then let the OS configure the rest? If the OS wants to re-asign hardware resources does it store this information in the ACPI tables so that the next time the system is booted it assigns them how the OS wants? The ACPI driver asks the PCI bus driver (Pci.sys) to enumerate devices on it's bus once the OS is loaded, how are these devices configured whilst the PC is booting when it doesn't have other bus drivers? Any help with any of the above questions would be greatly appreciated. Thanks.

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• ASA Slow IPSec Performance

  - by Brent

  I have a IPSec link between two sites over ASA 5520s running 8.4(3) and I am getting extremly poor performance when traffic passes over the VPN. CPU on the device is 13%, Memory at 408 MB, and active VPN sessions 2 so the load on the device is particularly low. Screenshot of wireshark file transfer between the two hosts over the VPN: The large amount of Header checksum failures is alarming, but I am not sure what to check now. I perf is showing around 4-5 Mbit/sec with differing TCP window sizes. Show Run on the ASA http://pastebin.com/uKM4Jh76 Show cry accelerator stats http://pastebin.com/xQahnqK3

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• How to increase Remote Desktop resolution?

  - by BugAlert

  I'm using Windows 7 on a PC and connect to it via Remote Desktop Connection for Mac by MS, using a Mac. On the Mac, I have a 27" Display with 2560 x 1440 px resolution. The PC has a high performance graphics card (one of those that needs an additional power supply). Both machines are connected via network cable to a router. So network should be insanely fast. However, the max resolution I can get is 1400 x 1050. The PC just has a old and bad 21" monitor connected to it. How can I increase the resolution to 2560 x 1440 to work fullscreen with the Apple LED Cinema Display via Remote Desktop? Maybe I shouldn't even ask, because I already experience some lag at the low resolution of 1400 x 1050. But I guess this can be resolved as well?

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• Any experience with SATA SAS Interposer Cards?

  - by korkman

  Driven by the current price difference between SATA and SAS disks on one side and the potentially bad behaviour of SATA disks in bigger storage arrays on the other side, I have found so-called SATA-to-SAS interposer cards. Advertised as "seamlessly adding SAS capabilities to existing SATA disk drives", I wonder if anyone here has had some experience with these or similar products. The major benefits I can identify are the increased cable voltage (if all drives are SAS connected), the ability to power-cycle the drive and multipath (if desired). Obviously the SATA drive will still have to be RAID edition. The question is: Do these cards indeed increase the overall reliability of a storage system, or will failing SATA disks cause trouble nevertheless? Edit: I'm not asking for hypothetical answers, only actual experience please. I'm well aware that the typical 10k SAS drive is more reliable (and better performing) than 7200 SATA drives. But how does a nearline SAS, which is phyiscally the same disk as its SATA counterpart, compare to the SATA version with interposer?

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• Poor CPU usage under Ubuntu

  - by remek

  Hello, I just upgraded from Ubuntu 9.10 to Ubuntu 10.04 and I am now experiencing a strange problem. My computer has a quad-core processor, and when I am running several processes simultaneously, none of the cores is fully used. Before the upgrade, when I was running 4 processes, each of them was using 100% CPU (I could see that with the 'top' command). But now, CPU usage oscillates and is always pretty low. Has anybody an idea about this problem? Is it due to Ubuntu or to the program I am running? Thank you very much in advance for your help! Best, remek

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• Ubuntu/Linux version recommendation for HP dv6 3122TX?

  - by sanjayav

  I purchased a HP dv6 3122TX recently and after installing Ubuntu 10.10 64 bit I ran into multiple issues like, The wireless driver is not supported by Uubntu. (1) [The driver is RaLink RT3090 ] The ethernet stopped working sometimes for no reason [The driver is Realtek RTL8111/8168B ] "Corrupted low memory at ..." issue which is described as a kernel bug in Ubuntu support forums. (It started to take me to a terminal instead of the GUI and couldn't start x server after that) As I'm not an expert Ubuntu user I got fed up of all these issue and got back to Windows 7. But I need an Ubuntu installation up and running for my development work. What are your suggestions about a reasonable Ubuntu version that I should try? Or a different Linux variation? Should I stick to a 32-bit version? It'd be great anyone can give some advice on this issue.

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• spurious hardware memory 'errors' on hp dl380 g5's being generated

  - by friedchicken

  Hi All, i've got 2 new HP dl380g5 servers running HP's esxi4 patched to 219382. they have both been patched up to the latest hp firmware levels (firmware cd 8.7) both are running 32gb (4 x 8gb sticks) both servers are showing the same symptoms - the memory lights come on for two (random) dimms on the front of the server and the health led turns red. sometimes the server stays up and running with no problems. othertimes the server locks dead and only a power reset can bring it back. there is nothing showing in the ilo logs and nothing within the vmware hardware monitoring. the memory has been replaced i've got other customers that have been running dl380g5's with out any issues on esx3.5 - this is our first vsphere deployment with them. these are meant to go live soon so any advice would be great. thanks in advance.

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• How to set Laptop Brightness in Gnome and /proc on Thinkpad W510?

  - by hakre

  I can set the brightness of my laptop screen already via /proc. I can read and change the value. Now I've set the value to 33 and then I went into gnome power management and enabled the option that it should reduce the backlight brightness being on battery. That works, the screen gets darker. If I now read out the current setting from /proc it still says it's 33. So I assume that there is another node in /proc to be used to control the brightness. The node I use so far is: /proc/acpi/video/VID/LCD0/brightness I'm using the nouveau driver. With the nvida driver the brightness can not be controlled.

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• Outlook Express hangs when selecting multiple emails

  - by Javier Badia

  I'm using Outlook Express (6, I think) on Windows XP. Lately, it has been hanging. Sometimes this happens at startup (right after the main window with all the panes loads) and sometimes when selecting many emails (sometimes as low as three emails at once, sometimes at ten, it's not a fixed number). When this happens, msimn.exe starts to use 98-100% CPU and RAM usage shoots up very quickly, reaching hundreds of megabytes in half a minute. The message pane goes gray instead of showing the message contents. As I said, this sometimes happens right after the main window loads, sometimes when selecting many emails at once. I tried backing up everything, deleting the identities, creating a new one and restoring, but this still happens.

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• SQL server availability issue: large query stops other connections from connecting

  - by Carlos

  I've got a high-spec (multicore, RAID) server running MS SQL 2008, with several databases on it. I have a low throughput process that periodically needs a small amount of information from one of the DBs, and the code seems to work fine. However, sometimes when one of my colleagues does a huge query against one of the other DBs, I see full CPU usage on the machine, and connections from my app time out. Why does this happen? I would have thought the many cores and harddisks would somehow (together with cleverly written DB server) be able to keep at least some of the resources free for other apps? I'm pretty sure he doesn't use multiple connections for his query. What can I do to prevent this?

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