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• What hardware makes a good MongoDB Server ? Where to get it ?

  - by João Pinto Jerónimo

  Suppose you're on dell.com right now and you're buying a server to run your MongoDB database for your small startup. You will have to handle literally tens of thousands of writes and reads per minute (but small objects). Would you go for 2 processors ? Invest more on RAM ? I've heard (correct me if I'm wrong) MongoDB handles the most it can on the RAM and then flushes everything to the disk, in that case I should invest on a CPU with a large L2 cache, probably 40GB of RAM and a solid state drive.. right ? Would I be better off with a high end (~$11,309, 2 expensive processors, 96GB of RAM) server or 2x(~$6,419, 2 expensive processors, 12GB of RAM) servers ? Is Dell ok or do you have better sugestions ? (I'm outside the US, on Portugal)

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• Storage disk format to use to be utilised by all OS

  - by ClothSword

  Aiming to have a large internal HDD to store files, and several OSes on separate disks. They all need to read and write to one storage drive. Ubuntu (13.04+) Mac OSX (10.8+) Windows (7+) What format should the drive be? Would like to avoid buying third party software, here's what I have discerned so far: NTFS - Can't be written to by Mac without buying third party software? ext3 - Windows can't read, third party software in development. Mac has OSXFUSE HFS+ - Buy third party and/or faff around to get working on windows exFAT - Cross platform, but breaks MS patents?

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• Is it possible to restrict fileserver access to domain users using computers that are members of the domain?

  - by Chris Madden

  It seems domain isolation can be used to accomplish, but I'd like a solution that doesn't require IPsec, or more accurately, doesn't require IPsec on the fileserver. IPsec if done in software has a large CPU overhead and our NAS boxes don't support any kind of offload. The goal is to avoid authenticated users using non-managed machines to access network resources. Network Access Protection (NAP) and the various enforcement points looked promsiing but I couldn't find a bulletproof way to use them [which doesn't require IPsec on the fileserver]. I was thinking when a domain user accesses the NAS box it will first need a Kerberos ticket from AD, so if AD could somehow verify the computer that was requesting the ticket was in the domain I'd have a solution.

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• How to get Bash shell history range

  - by Aniti

  How can I get/filter history entries in a specific range? I have a large history file and frequently use history | grep somecommand Now, my memory is pretty bad and I also want to see what else I did around the time I entered the command. For now I do this: get match, say 4992 somecommand, then I do history | grep 49[0-9][0-9] this is usually good enough, but I would much rather do it more precisely, that is see commands from 4972 to 5012, that is 20 commands before and 20 after. I am wondering if there is an easier way? I suspect, a custom script is in order, but perhaps someone else has done something similar before.

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• File store: CouchDB vs SQL Server + file system

  - by Andrey

  I'm exploring different ways of storing user-uploaded files (all are MS Office documents or alikes) on our high load web site. It's currently designed to store documents as files and have a SQL database store all metadata for those files. I'm concerned about growing out of the storage server and SQL server performance when number of documents reaches hundreds of millions. I was reading a lot of good information about CouchDB including its built-in scalability and performance, but I'm not sure how storing files as attachments in CouchDB would compare to storing files on a file system in terms of performance. Anybody used CouchDB clusters for storing LARGE amounts of documents and in high load environment?

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• script Disk Management configuration

  - by Joseph

  I have 10 workstations with large monitors that have USB slots and several card readers built in. The card readers cannot be disabled and will map to drive letters when I image the computers. I go into Disk Management and delete the drive mappings and add mappings to a single folder in C:\ with a folder for each slot. I have to do this because of scripts that run that are expecting specific letter drive mappings to network resources. Is there a way to script the deleting and adding of drive mappings instead of having to use the Disk Management GUI manually on each workstation? The workstations are running XP Professional.

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• Minimizing windows to tray in xfce

  - by Gryllida

  For XFCE (v. 4.8), I'm searching for possible options to minimize windows to tray (iconify). This means that 1) they're not in the window listing and 2) they're not in the alt+TAB menu and 3) when closed, the window hides (it disappears from window listing but still stays running). "alltray" has some weird GTK-related bug (https://bugs.launchpad.net/alltray/+bug/589831; windows hide but unhiding doesn't do anything; they stay in the tray icon until the user undocks them). "trayer" complains that "another systray is already running" and there's no obvious workaround. This question here is to ask about possible minimalistic (as everything in XFCE is) solutions which don't involve manual compiling, and aren't an overkill like cairo-dock is (a rather bloated gnome-style application which creates a new large 'tray' instead of using the existing one). Thanks!

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• Is SCCM overkill for medium-sized organizations?

  - by Le_Quack

  I am an IT technician in a high school with around 1600 students 250 staff and 800+ client computers mostly running Windows 7. Our team is composed of three members. My boss seems content with a network that works (just about) not necessarily a productive well maintained network that is easy to run and maintain. I'm still fairly early on in my I.T. career so I'm not up to speed on all the different endpoint management solutions that are available. I'm looking for a better way to manage clients (deploy software, track changes, inventory etc) I like the look of SCCM 2012's features but the case studies seem to be aimed at large multi-site infrastructural rather than a single mid sized site. Is SCCM suitable for a mid sized single site or is it aimed at much larger corporations? How can I determine whether or not an endpoint management solution like SCCM is a good fit for our organization? EDIT: Thanks for all the help I'll take a look at SCE and SCCM and get some proposals drawn up to take to my boss/deputy head

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• PostgreSQL disaster recovery options

  - by Alex

  My customer has quite a large (the total "data" folder size is 200G) PostgreSQL database and we are working on a disaster recovery plan. We have identified three different types of disasters so far: hardware outage, too much load and unintentional data loss due to erroneously executed bad migration (like DELETE or ALTER TABLE DROP COLUMN). First two types seem to be easy to mitigate but we can't elaborate a good mitigation plan for the third type. I proposed to use ZFS and frequent (hourly) snapshots but "ZFS" means "OpenIndiana" these days and our Ops engineers do not have much expertise in it, so using OpenIndiana imposes another risk. Colleagues try to convince me that restoring from PostgreSQL PITR backup can be as fast as restoring from a ZFS snapshot but I highly doubt that replaying, say, 50G of archived WALs can be considered "fast". What other options are we missing? Is ZFS an only viable alternative? Can we get a fast Pg DB restore time in the Linux environment?

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• Graciously shutdown external HDD enclosure?

  - by Jakobud

  I recently purchased a large HDD along with the following HDD enclosure: http://www.newegg.com/Product/Product.aspx?Item=N82E16817173043 It has a simple on-off switch on the back. When I want to turn this thing off, do I simply just flip the switch? I assume the switch simply kills the power to the HDD, but isn't that potentially a bad thing in the case that the HDD is still reading/writing? I used to have a Seagate external HDD and it had a button on the front that I had to hold down for a second or two before it would turn off, but it at least appeared to sort of go through a shutdown procedure where it probably would stop the HDD activity before cutting power. So with this external HDD, I'm a little bit leery about that power switch and understanding exactly what it does. Is this how all HDD enclosures are? EDIT: I'm running the drive in Ubuntu Server. So there is no 'ejecting' the drive lol

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• IIS7 response size thresholds

  - by DanielM

  I have a customer who is attempting video playback via HTTP progressive download of very large files ( 1 GB). There is no problem once a file is cached at the edge via my CDN, but hits to my origin (first hits prior to edge-cache population) experience stalling and loss of sync between audio and video about an hour and a half into playback. This occurs pretty reliably at that point, suggesting that some threshold somehwere is getting hit. Are there IIS configuration knobs governing HTTP Response size? Other data points: I am unable to replicate this problem. I am looking at client bandwidth and last mile issues. I am looking at possible encoding recipe dependencies. But this problem never came up when we were using a "push" cache configuration (CDN-hosted origin), so something funky serverside at my origin seems like a likely culprit. Thanks ...

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• using nmap to guess remote OS and probe service details on a single port only

  - by WoJ

  I am looking at scanning with nmap a large network in order to identify the OS of devices (-O--osscan-limit) probe for details of a service on a single port (I would have used -sV for all open ports) The problem is that -sV will probe all the ports (which I do not want to do for performance reasons) and I cannot use -p to limit the ports to the one I am interested in as this impacts the OS fingerprinting. I could not find anything in the manual to limit the service probing. Thank you for any ideas (including other approaches outside of nmap, though I would prefer to stick to nmap)

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• HP ProBook 4540s - Can't find HP Protect Tools to activate fingerprint reader

  - by CandiM

  I got an HP ProBook 4540s in December--When I first got it, every time I booted up, there was a rather large icon, almost like a Windows 7 gadget, to access HP Protect Tools, but I had too much going on to mess with it right away and kept clicking on something like "remind me next time I log on" and determined to get acquainted with it after the holidays--But at some point in time, that icon went away and now I can't locate it at all-- I'd like to try, and probably use, the fingerprint reader and explore whatever else is among the Protect Tools, but now I can't find them or any folder or .exe to acceess them-- Can anyone help me find them?-- Thanks so much

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• make "sort by" permanent for specific folder

  - by Black Cobra

  I have a folder where I store all my web icons in .png and .ico format. I set view to large icons and sort by to date modified -> descending. When I save new icons in this folder from web, I drag and drop them from browser (chrome) to the folder. The problem is after that the icons in the folder are not sorted by date modified descending any more... So how can I set any file or program or something that will set the sort by to date modified -> descending for that folder only each time I will access (open) the folder? I am using window 7 x64.

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• Can a 32-bit RHEL4 userland work with a 64-bit kernel?

  - by James

  Is there a way to change an i386 RHEL4 machine to run an amd64 kernel, but ensure that it still builds software into same i386 binaries? On Debian this seems quite straightforward: just install an amd64 kernel (worst case, build one like this guy: http://www.debian-administration.org/users/jonesy/weblog/1) and prefix everything with "linux32". Then everything that considers uname -m will be unchanged, I just need to handle the few cases that consider uname -r. What is the Red Hat equivalent? Is the only way a full 64-bit installation on another disk and then chrooting back to the 32-bit system before anyone builds anything? (Even the best examples of that seem to be Debian-based.) Background: We make a large system that runs on (a variant of) i386 RHEL4. However, some of the larger RHEL build machines now have enough RAM that they might benefit from going 64-bit (for the kernel and maybe some of the bigger build steps). Our build system doesn't support cross-compilation.

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• Best FFDShow settings for upscaling SD content to 1080p HD?

  - by Richard

  Hi there, I'm running Windows Media Center 7 with ffdshow-tryouts for the decoding of many of the popular video formats. It works great. I've now upgraded my television from SD to 1080p HD and, naturally, I've still got a large number of existing MP4/XviD/DivX items of content which is in SD. I'd like, therefore, to modify the settings of ffdshow so that they are upscaled to 1080p as best as possible. I appreciate that they won't be as good as their HD equivalent - but on the flip side, I'm pretty certain I can do more than just resizing the picture to get the best possible output. Can anyone recommend the best settings in ffdshow to do this? For example, should I apply a sharpen mask? Or Noise Reduction? Or Deinterlace? Alternatively, would it be better to keep them at their current resolution and let the TV (Samsung Series 5 LE32C580) do the upscaling? Thanks.

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• rsync doesn't use delta transfer on first run

  - by ockzon

  I'm trying to synchronize a large local directory (with a batch file using rsync 3.0.7 on Cygwin, Windows 7 x64, 30k files, 200gb size) to a remote server (Debian x64 with kernel 2.6, rsyncd 3.0.7) over a slow internet connection (90kbyte/s upload). I know almost all files are identical and I verified that using md5sum locally and remotely. However when executing rsync from my local machine every file gets transferred completely for the first time. When I terminate the batch file after a few transfers and run it again then the already transferred files are skipped. But as soon as it gets to a file not yet transferred it uploads the file as a whole again instead of noticing that the checksum is the same locally and remotely. The batch file calling rsync looks like this (backslashes and line brakes added here for readability): c:\cygwin\bin\rsync.exe --verbose --human-readable --progress --stats \ --recursive --ignore-times --password-file pwd.txt \ /cygdrive/d/ftp/data/ \ rsync://[email protected]:33400/data/ | \ c:\cygwin\bin\tee.exe --append rsync.log I experimented using the following parameters in varying combinations but that didn't help either: --checksum --partial --partial-dir=/tmp/.rsync-partial --compress

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• Create netbook recovery image without DVD burner (virtual burner?)

  - by Dan

  I have a new Acer Aspire One which is asking to create a recovery DVD. It doesn't have a built in burner, and I don't have a USB burner. However I do have a large USB hard drive. Is there some way to get the recovery software to "burn" an image file instead of a real DVD? I know you can download a Linux recovery image, but the netbook comes with XP. I plan to install Linux on it but I'd like an XP recovery image just in case.

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• IE9 HANGS: jquery based webapp hanging ONLY with IE9

  - by Daniele B

  I'm stuck on this issue since days... This is the site I'm talking about. It is a webapp which makes large use of backbone, visualsearch, jquery plugins. This website is not working at the moment with IE8, but it's fine that it works with IE9...if just it would! What happens is that the website hangs when loaded ONLY with IE9 and (this is bizarre!) if the profiler tool of IE9 developer tools is ON it doesn't!! It also happens to oher people (I was notified of that) so I'm pretty sure it's not an issue linked to my browser settings. It makes me think about an error which has something to do with delays, or iterative functions which, in presence of profiler, are forced to delay bte cycles and so to leave free time slots to other functions which render the page. I can update with more details if needed. thanks.

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• TCP video streaming: TCP throughput(rate) and RTT

  - by misteryes

  we know that a rough estimation of TCP rate is: WINDOW/RTT, where WINDOW is the min(CWIN, RWIN), CWIN is the congestion window size of the sender, while RWIN is the receiving window. nowadays, the encoding rate of videos may be 1000KB/s(8000kbit/s), if RTT is 500ms, it needs the window size to be 2000KB. But we know that usually the receiving window size is below 64KB, there is a big gap. so if RTT is too large, TCP streaming is not possible? Is my understanding right? thanks!

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• Is a larger hard drive with the same cache, rpm, and bus type faster?

  - by Joel Coehoorn

  I recently heard that, all else being equal, larger hard are faster than smaller. It has to do with more bits passing under the read head as the drive spins - since a large drive packs the bits more tightly, the same amount of spin/time presents more data to the read head. I had not heard this before, and was inclined to believe the the read heads expected bits at a specific rate and would instead stagger data, so that the two drives would be the same speed. I now find myself looking at purchasing one of two computer models for the school where I work. One model has an 80GB drive, the other a 400GB (for ~$13 more). The size of the drive is immaterial, since users will keep their files on a file server where they can be backed up. But if the 400GB drive will really deliver a performance boost to the hard drive, the extra money is probably worth it. Thoughts?

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• How to make the PC speaker beep from the Windows 7 command prompt?

  - by oKtosiTe

  I'm running some lengthy video encodes using the Handbrake command line interface. After all my encodes are done, I would like to have the PC speaker beep, as I usually turn my large external speakers off. On Linux I would install the "beep" package, but so far I haven't found such a program for Windows 7. Possibly related links: System "Beep" sound does not function in Windows Vista x64 with HD Audio devices (I am indeed using an HD Audio device: the SoundMAX ADI1986A) What’s up with the Beep driver in Windows 7? Edit: The question seems to have morphed into "How to make Windows 7 beep the PC speaker?", for which the answer provided by HarryMC is the most appropriate.

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• Changing bounds of excel file embedded in powerpoint

  - by Brett

  When I embed an excel files into powerpoint, I'm having two issues. On some of the spreadsheets, empty columns are displayed on the right hand side of the powerpoint slide On other spreadsheets that are too large to fit, I can't adjust the bounds of what I'd like to be displayed on the slide. So, I couldn't choose a larger area to display of the excel spreadsheet and just size it down. It arbitrarily chooses where to cut off the excel spreadsheet on the slide. Is there any way to adjust which part of the excel file is embedded?

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• ec2 ami device mapping

  - by hortitude

  I have large ec2 Ubuntu image and I'm just looking through the devices. I noticed from the metadata that % curl http://169.254.169.254/latest/meta-data/block-device-mapping/ami sda1 % curl http://169.254.169.254/latest/meta-data/block-device-mapping/ephemeral0 sdb However when I look what is actually mounted there is /dev/xvda1 and /dev/xvdb (and there is no /dev/sd* ) I know that both names look somewhat valid from the AWS documentation, but it looks to me from this like there is a mismatch in the instance metadata and what is actually on the machine. Why don't they match?

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• Deleting pagefile.sys on shutdown

  - by Daniel E. Shub

  I have a Windows XP machine (it is a VM running in Xen) that I would like to backup. I have enabled ClearPageFileAtShutdown by following MS KB 314834. If I cleanly shutdown the XP machine and then mount the drive in another machine (which is trivial since the machine is virtual) I still have a large pagefile.sys. I was hoping that enabling ClearPageFileAtShutdown would result in a pagefile.sys with a size near zero. I have two questions. First, is it possible to have pagefile.sys be deleted, or have a drastic size reduction, at shutdown? Second, can I exclude pagefile.sys from my backup?

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