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• Home Networking Questions

  - by Eddie Parker

  Hello: I'm looking to wire my home with CAT-X (where X is probably going to be CAT-6, unless someone can convince me differently. ;) ). I'm seeking advice on what equipment I'll need for the job, and any things I should watch out for. It's a two story half-duplex I'll be wiring, roughly about 1800 sq ft. Here's what I believe I need so far: Bulk CAT-6 Ethernet cabling CM Rated Gigabit switch(es?) Patch panel Equipment for cutting, terminating wire, fishing through walls, etc Wall outlet covers, etc. Questions I have: Does it matter the MHz rating on the Ethernet cable? If so, why? I have two gigabit switches currently, an 8-port and a 5-port. Should I buy one massive switch to cover all the connections I need, or should I just chain the two together and buy a switch for however many other connections I need? Do I really need a patch panel? I understand it keeps the cables looking cleaner than coming out of a hole in the wall, but is there some other product I can use, perhaps combining a switch with a patch panel or some such? Ideally I'll have all this running out of a relatively small closet, so the less components (or smaller) the better. Any advice, links, or suggested product to use/avoid would be appreciated!

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• COM+/Desktop Heap errors in IIS affecting sites at random?

  - by tresstylez

  We have a Win2K3 server that is hosting 30+ sites. Each site is configured to have its own unique application pool -- so that we can manually recycle specific sites if needed and not kill sessions for the others. From what I've read, the consequence of this type of setup is that each application pool worker process gets allocated a Desktop Heap (normally 512 kb's) and we limit the number of app pools we can serve. http://blogs.msdn.com/b/david.wang/archive/2006/01/25/security-considerations-of-usesharedwpdesktop-on-iis6.aspx PROBLEM: What we're seeing is that occasionally COM+ errors get triggered, presumably by hitting our 512 kb limit of the desktop heap -- and certain sites become unresponsive (or have errors) until we manually recycle that specific app pool. I know that I can increase the desktop heap limit to 1024, and make other tweaks/tunes, but I've been tasked with finding out what exactly causes one site's heap to max out as opposed to another. It seems that when we start seeing COM+ errors, the sites it affects are random -- small sites or big sites (heavier used). Is it based on process id? Traffic? Any pointers on understanding this a little more would be excellent. Thanks! jg

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• Server 2008 R2 Dns Lockup

  - by Richard Maynard

  Hi, We've deployed our first 2008 R2 server on a client site which has replaced their existing 2003 DC. This server provides DNS resolution services to all client machines on that site for general internet usage. Since using the 2008 R2 DNS services we have noticed every couple of days the DNS server starts timing out when requests to certain sites are made (google is the only example I can provide at this time although it seems to be larger sites with problems rather than small - CDN compatiblity issue?). When you restart the DNS Server service then resolution returns to normal... just only for a day or so. Is anybody aware of any significant changes to the DNS server architecture or configuration out of the box in R2 that may explain this intermittent behaviour? I have already tried the fix listed here to no avail: http://weblogs.asp.net/owscott/archive/2009/09/15/windows-server-2008-r2-dns-issues.aspx The following PS command prompt info illustrates the issue: PS C:\Users\Administrator.UK> nslookup Default Server: s8209001.uk.kingdomfaith.com Address: 10.1.3.4 > www.google.com Server: s8209001.uk.kingdomfaith.com Address: 10.1.3.4 Non-authoritative answer: Name: www.l.google.com Addresses: 66.102.9.99 66.102.9.104 66.102.9.105 66.102.9.103 66.102.9.147 Aliases: www.google.com > www.google.co.uk Server: s8209001.uk.kingdomfaith.com Address: 10.1.3.4 * s8209001.uk.kingdomfaith.com can't find www.google.co.uk: Server failed Thanks in advance. Regards,

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• Exchange 2003: Fresh install, couple noob questions.

  - by Eli

  Hi All, Thanks for reading! I have a small network set up for a local office here, and have a fresh install of Exchange 2003 on our sole-server PDC. The network uses one domain, call it ourdomain.net, which is DNSed locally, but not DNSed for the actual domain, so ourdomain.net works from within the network, but from outside, it's just pointed to some domain parking. I have a completely different domain, call it emaildomain.com, which is currently setup for our website and email, which is hosted with a standard hosting company. We've been using a combination of Thunderbird and Outlook (with local .pst files) for email. I've been asked to setup Exchange to work with our email, but am not familiar with it. The install seems to have gone just fine. The question is: How do I get email from a domain outside our network to work with the exchange server? Do I need to move the email for that domain to point to our local server (I so hope not!), or can I just set exchange so somehow slurp mail from the existing mailboxes on our host for that domain's mail? Or are there better ideas I don't know to ask for? Any help very appreciated - thanks!

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• Per client DNS server assignment using Pfsense

  - by Trix

  I have a network where pfsense is the gateway. There are two sets of clients that I want. One where there will be some restrictions to the network (example, IM being blocked) and one network where there are no restrictions. One easy way I thought about doing this was assigning the different domains different DNS servers. One set could use OpenDNS, the other could use Google's Public DNS. The set with OpenDNS would have the filter options on (using OpenDNS' dashboard, I can check block IM .... so I do not manually need to block login.oscar.aol.com, meebo.com, gmail chat ....etc). So the problem is the DHCP server looks like it will only assign a single set of DNS servers to clients. Is there a way to set a per client assignment? Is there a better way to obtain what I want to obtain. This is just a small home network. I do not need anything fancy, but I do need this functionality in one way or another.

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• ClearOS - how to create a site to site VPN between two ClearOS boxes?

  - by Scott Szretter

  I plan on setting up some ClearOS boxes at several sites, and would like to set up site-to-site VPN between the remote sites and a main site (all running ClearOS enterprise 5.2sp1 / latest version). I have found references for how to set up ClearOS to VPN in to devices such as cisco for IPSEC, and others with PPTP. But for these methods it did not mention how you might configure 2 ClearOS boxes to talk to each other ipsec or pptp. I also saw documentation on installing OpenVPN and using the OpenVPN client software to VPN in to the ClearOS box. I will probably use this for individual users to VPN in, but I have some small sites ( 1 to 10 users) that will have their own ClearOS box and need to create a site to site VPN link back to the main site's OpenVPN box. Is this possible, can you point me to docs, or other info or basically, how? A couple updates: I did find a thread that asks the same basic question, where the user has a vpn set up between the two clearos machines (after installing ipsec vpn modules), just not transporting traffic between the LANS - and the very last post claims you have to edit some files (/etc/ipsec.conf) and set leftnexthop rightnexthop values to %direct. After that, it's supposed to work. Could it be that simple? I also posted to clear foundation, and they pointed me to some documentation for setting up ipsec unmanaged vpn. This looks pretty good, but, I will most likely need to figure out how to handle a dynamic dns type setup at least on one end. Also, what does it mean by multi-wan? Finally, what happens when a vpn connection goes down exactly - someone has to reboot the box or ?

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• Windows Audio Issue

  - by Nikki

  This one is driving me nuts. Hoping someone can shed some light. I'm running windows 7 using onboard audio. It's been fine for over 2 years but lately there's a problem every time I play audio. I hear a small soft burst of static and the volume turns itself down from 50% to 23%. Once at 23%, it plays fine. No related events logged in viewer. No reported problems with the device. Different headphones, same problem. I played around with audio settings for hours but the problem persists. EDIT: ok more info: Motherboard: ECS G31T-M LGA775 System info displays this: Name High Definition Audio Device Manufacturer Microsoft Status OK PNP Device ID HDAUDIO\FUNC_01&VEN_1106&DEV_E721&SUBSYS_10192683&REV_1001\4&3D4E739&0&0001 Driver c:\windows\system32\drivers\hdaudio.sys (6.1.7600.16385, 297.00 KB (304,128 bytes), 14/07/2009 9:51 AM) I'll keep adding info as I find it. The question I want resolved is; Is it faulty hardware? If so, I can buy a sound card. I can't imagine software is responsible since I haven't installed anything new for weeks. Virus scans are clear as well. The static burst is irritating to say the least. Tried 2 different headphones and separate speakers. Same problem. I know it's not an easy problem but I was hoping someone had encountered the same thing.

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• Destination host unreachable - Windows Server 2008

  - by Doug

  Hi There, I'm working with a windows 2008 domain controller, which I'm having issues connecting to internet resources. A small bit of background, this is a 2008 domain controller that has been added into an existing Win 2k domain, with a goal of replacing the older computers. Both of the older controllers can still access internet resources, and so can all the clients. When I ping Google.ca from the new server, it does resolve to an ip address, but then says "Reply from 192.168.123.20: Destination host unreachable." I'm really at a lost now, I've checked and rechecked my ip configuration, the default gateway is my router, the primary DNS server is the my DC, and the secondary DNS is also my router. The DNS server on the domain has a forwarder added for the router as well. Everything on my local network works just fine, all my internal resources can be resolved. For the time being, I've stopped the Firewall service. I'm not 100% used to Server 2008 yet, but it might be a case of just missing something simple. Thanks for your time.

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• Destination host unreachable - Windows Server 2008

  - by Doug

  Hi There, I'm working with a windows 2008 domain controller, which I'm having issues connecting to internet resources. A small bit of background, this is a 2008 domain controller that has been added into an existing Win 2k domain, with a goal of replacing the older computers. Both of the older controllers can still access internet resources, and so can all the clients. When I ping Google.ca from the new server, it does resolve to an ip address, but then says "Reply from 192.168.123.20: Destination host unreachable." I'm really at a lost now, I've checked and rechecked my ip configuration, the default gateway is my router, the primary DNS server is the my DC, and the secondary DNS is also my router. The DNS server on the domain has a forwarder added for the router as well. Everything on my local network works just fine, all my internal resources can be resolved. For the time being, I've stopped the Firewall service. I'm not 100% used to Server 2008 yet, but it might be a case of just missing something simple. Thanks for your time.

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• How to get decent WiFi despite a virtual Faraday cage

  - by MT_Head

  One of my clients is the local branch of an international airline. They have a small office in the secured area behind the ticket counters, and timeshare space at the ticket counter. I need to add a ticket printer out front, which I cannot (for contract/liability reasons) attach to the shared computer at the counter; the only workable solution seems to be to put the printer and its attached computer on a cart and connect to the office's network via WiFi. So far, no problem - right? Well, the terminal has been getting a facelift, which - among other things - includes decorative stainless-steel panels along the wall behind the ticket counters. This paneling acts as a seriously effective barrier to WiFi! The office's WiFi router - a brand-new D-Link DIR-815, dual-band 802.11n - is just on the other side of the pictured wall, and twenty feet or so to the right. And yet the only way I can connect AT ALL on this side of the wall is to stick the USB adapter (on the end of an extension cable) right into the crack between panels... and even then I can only see the 5GHz network, and that very weakly. Has anyone else had experience with this sort of misguided interior decoration? Any ideas on how I can improve reception on the other side of the barrier? (Needless to say, physical modifications of the environment - tempting though they might be - are strictly no-go.)

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• SharePoint 2010 User Profile Synchronization

  - by manemawanna

  Hello, I'm completely new to working with SharePoint and Windows Server, but last week I was given a small brief to play with SharePoint 2010 to see how I got along with it. Anyway I've set up a SharePoint server and had a mess around to get some new sites and pages created etc, but I'm now looking to have a try at importing some AD groups. As part of this I've look at these tutorials, here and here. So far I've got through to the process of starting the User Profile Service which works fine, but when I get it starting the User Profile Synchronization service it sits on starting. But when I refresh the page or go to the monitoring section it shows it as aborted. Now I'm new to administering servers like I say and when I start the User Profile Synchronization service it tries to run as NT AUTHORITY\NETWORK SERVICE and asks for a password so I've been providing it with the admin password, now I'm not sure if this is part of the issue or not as I've checked the log files and they seem to say that it doesn't have permissions, which is fair enough, but I can't see how you can change the account even if I wanted to. So if anyone could help it would be appreciated, if you need any further information to help with an answer, just let me know.

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• Outgrew MongoDB … now what?

  - by samsmith

  We dump debug and transaction logs into mongodb. We really like mongodb because: Blazing insert perf document oriented Ability to let the engine drop inserts when needed for performance But there is this big problem with mongodb: The index must fit in physical RAM. In practice, this limits us to 80-150gb of raw data (we currently run on a system with 16gb RAM). Sooooo, for us to have 500gb or a tb of data, we would need 50gb or 80gb of RAM. Yes, I know this is possible. We can add servers and use mongo sharding. We can buy a special server box that can take 100 or 200 gb of RAM, but this is the tail wagging the dog! We could spend boucoup $$$ on hardware to run FOSS, when SQL Server Express can handle WAY more data on WAY less hardware than Mongo (SQL Server does not meet our architectural desires, or we would use it!) We are not going to spend huge $ on hardware here, because it is necessary only because of the Mongo architecture, not because of the inherent processing/storage needs. (And sharding? Please! Cost aside, who needs the ongoing complexity of three, five, or more servers to manage a relatively small load?) Bottom line: MongoDB is FOSS, but we gotta spend $$$$$$$ on hardware to run it? We sould rather buy commercial SW! I am sure we are not the first to hit this issue, so we ask the community: Where do we go next? (We already run Mongo v2) Thanks!!

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• Recovering a VHD after resizing it using VBoxManage

  - by tjrobinson

  I am using VirtualBox 4.1.18 and had a virtual machine running Windows 8 RC with a single VHD, which was initially sized at 25GB (too small!). After installing the OS and some applications I ran out of disk space so shut down the guest and then used this command to resize the VHD to 80GB: C:\Program Files\Oracle\VirtualBox> .\VBoxManage.exe modifyhd "D:\VirtualBox VMs\Windows 8 RC\Windows 8 RC.vhd" --resize 81920 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100% C:\Program Files\Oracle\VirtualBox> .\VBoxManage.exe showhdinfo "D:\VirtualBox VMs\Windows 8 RC\Windows 8 RC.vhd" UUID: 03fb26e7-d8bb-49b5-8cc2-1dc350750e64 Accessible: yes Logical size: 81920 MBytes Current size on disk: 24954 MBytes Type: normal (base) Storage format: VHD Format variant: dynamic default In use by VMs: Windows 8 RC (UUID: a6e6aa57-2d3a-421b-8042-7aae566e3e0b) Location: D:\VirtualBox VMs\Windows 8 RC\Windows 8 RC.vhd So far so good. However, when I started the guest up again I got the dreaded: Fatal: No bootable medium found! system halted If I boot into GParted it shows a single 80GB drive as "unallocated". The option to scan for and attempt to repair a filesystem doesn't find anything. I also tried cloning the VHD into a VDI file, just in case that magically fixed it: C:\Program Files\Oracle\VirtualBox> .\VBoxManage.exe clonehd "D:\VirtualBox VMs\Windows 8 RC\Windows 8 RC.vhd" "D:\VirtualBox VMs\Windows 8 RC\Windows 8 RC.vdi" --format VDI 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100% Clone hard disk created in format 'VDI'. UUID: baf0c2c4-362f-4f6c-846a-37bb1ffc027b C:\Program Files\Oracle\VirtualBox> .\VBoxManage.exe showhdinfo "D:\VirtualBox VMs\Windows 8 RC\Windows 8 RC.vdi" UUID: baf0c2c4-362f-4f6c-846a-37bb1ffc027b Accessible: yes Logical size: 81920 MBytes Current size on disk: 24798 MBytes Type: normal (base) Storage format: VDI Format variant: dynamic default In use by VMs: Windows 8 RC (UUID: a6e6aa57-2d3a-421b-8042-7aae566e3e0b) Location: D:\VirtualBox VMs\Windows 8 RC\Windows 8 RC.vdi Is there anything else I could try to recover the drive? No, I don't have a backup :( My host OS is Windows 7 64-bit.

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• Printer spooler spoolsv.exe crashes

  - by MattiasSN

  We have a problem with a Windows 7 print spooler. There is a Windows 2011 Small Business Server running as print server and 2 computers in the network their print spooler keeps crashing at random. The log files says it is ntdll.dll that has a fault. Naam van toepassing met fout: spoolsv.exe, versie: 6.1.7601.17514, tijdstempel: 0x4ce7b4e7 Naam van module met fout: ntdll.dll, versie: 6.1.7601.17725, tijdstempel: 0x4ec4aa8e Uitzonderingscode: 0xc0000374 Foutoffset: 0x00000000000c40f2 Id van proces met fout: 0x55c Starttijd van toepassing met fout: 0x01cd9db324904eb1 Pad naar toepassing met fout: C:\Windows\System32\spoolsv.exe Pad naar module met fout: C:\Windows\SYSTEM32\ntdll.dll Rapport-id: 8789af0b-09a6-11e2-9d78-001c25237c45 The print spooler on the server keeps running and works fine. We can also print from other computers. But on two computers the print spooler crashes. Sometimes it crashes after a user is logged in, but it also happened multiple times after a print job. After each crash we get the same ntdll.dll error. Hopefully someone can help me with this problem. If you need more information, don't hesitate to ask.

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• s3cmd fails too many times

  - by alfish

  It used to be my favorite backup transport agent but now I frequently get this result from s3cmd on the very same Ubuntu server/network: root@server:/home/backups# s3cmd put bkup.tgz s3://mybucket/ bkup.tgz -> s3://mybucket/bkup.tgz [1 of 1] 36864 of 2711541519 0% in 1s 20.95 kB/s failed WARNING: Upload failed: /bkup.tgz ([Errno 32] Broken pipe) WARNING: Retrying on lower speed (throttle=0.00) WARNING: Waiting 3 sec... bkup.tgz -> s3://mybucket/bkup.tgz [1 of 1] 36864 of 2711541519 0% in 1s 23.96 kB/s failed WARNING: Upload failed: /bkup.tgz ([Errno 32] Broken pipe) WARNING: Retrying on lower speed (throttle=0.01) WARNING: Waiting 6 sec... bkup.tgz -> s3://mybucket/bkup.tgz [1 of 1] 28672 of 2711541519 0% in 1s 18.71 kB/s failed WARNING: Upload failed: /bkup.tgz ([Errno 32] Broken pipe) WARNING: Retrying on lower speed (throttle=0.05) WARNING: Waiting 9 sec... bkup.tgz -> s3://mybucket/bkup.tgz [1 of 1] 28672 of 2711541519 0% in 1s 18.86 kB/s failed WARNING: Upload failed: /bkup.tgz ([Errno 32] Broken pipe) WARNING: Retrying on lower speed (throttle=0.25) WARNING: Waiting 12 sec... bkup.tgz -> s3://mybucket/bkup.tgz [1 of 1] 28672 of 2711541519 0% in 1s 15.79 kB/s failed WARNING: Upload failed: /bkup.tgz ([Errno 32] Broken pipe) WARNING: Retrying on lower speed (throttle=1.25) WARNING: Waiting 15 sec... bkup.tgz -> s3://mybucket/bkup.tgz [1 of 1] 12288 of 2711541519 0% in 2s 4.78 kB/s failed ERROR: Upload of 'bkup.tgz' failed too many times. Skipping that file. This happens even for files as small as 100MB, so I suppose it's not a size issue. It also happens when I use put with --acl-private flag (s3cmd version 1.0.1) I appreciate if you suggest some solution or a lightweight alternative to s3cmd. Thanks

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• RAID1 Broken Mirroring

  - by Sanoj

  I'm having a little server with Windows Small Business Server 2003. I'm using RAID1, via a HighPoint Rocket RAID 1640 RAID-card, using two harddrives. This week the server alarmed, and durig reboot I got the error-message Broken Mirroring (User Manual page 30). I had a few alternatives (see the manual), first I tried Continue, but the server restarted during boot. Next time I took Power Off, and replaced the oldest harddrive with a new one, and when I booted, I selected Rebuild. Then I selected the new harddrive to be the new one. The rebuild-procedure started and a progress bar at 0% showed up, but after a few seconds I got the message Copy Failed!, then the server booted and Windows Server started. Now it works fine. But I guess that I'm just using one harddrive now, and it's not mirrored. I haven't touched the server since then (two days ago). What should I do now? I have no experience of this situation. Anyone that have some guidance?

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• Site to Site VPN with Fault Tolerence

  - by Nordberg

  Hello, I have a situation where I require an IPSEC tunnel between two sites. Site 2 is a small branch office with basic (ADSL) connectivity and Site 1 is the "main" office with SDSL and ADSL for redundancy should the SDSL fail. From Site 1, all traffic bound for the 172.0.0.0 network will then be sent down another IPSEC tunnel to a supplier's Remote Server. See this page for the basic premise (this is a rough idea and things can be moved about etc...) I am considering specifying Cisco ASA devices as the firewalls for both sites for all connections. Would it be possible to employ something like HSRC to provide a backup at Site 1 should the SDSL go down? I suppose the key aims here are that Site 2 can somehow failover to initiate a VPN to the ASA behind the ADSL at Site 1. I will have a 21 subnet mask on all internet connections so can play with Class C routing if need be... If I'm barking up the wrong tree with HSRC, is there another way I can acheive this without massive expenditure on Barracuda routers et al? Many Thanks.

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• Windows 7 install detects SSD but doesn't list it to install to

  - by Mohamed Meligy

  I'm having quite a weird problem when trying to install Windows 7 SP1 on a new Corsair Force Series 3 SSD to replace a failing HDD in my wife's laptop. When I boot to Windows install, it shows that I have no disks to install to, and tells me to find it a driver to any custom disks I may have. When I go to repair option on the first install window, and then open command prompt Window, I can see the disk using diskpart, and can partition it and format partitions, and then later access them from command prompt and copy files to them. After creating partitions, clicking the "browse" button in Windows install screen that shows no disks available to install Windows to, does show the partitions created by diskpart! So, it does detect the disk and partitions, but refuses to list them as options to install to. People on the Interwebs seem to suggest that just running diskpart "clean" solved the issue for most people, just creating an "active" "primary" partition is al most tutorials suggest. Both got me only as far as described above. The BIOS doesn't have RAID option, changing between "ATA" and "AHCI" (the only available options) didn't make any difference. Might be worth mentioning that this is on a laptop that has Sata III controller for main drive (which I connected the Sata3 SSD to), and Sata II for DVD (which I used for Windows install media). That's what googling brings at least (DELL XPS 15 L502). Any ideas? . Update: The SSD is 460 GB. I tried setting it all as one partition and creating 70-90 GB partition as well (NTFS). More importantly, Windows doesn't list the partition as one it cannot install to (which it does with disks in general when they are small for example). What happens here is different. It doesn't list anything at all. It shows empty list of drives.

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• Dell Management Packs in System Center Operations Manager 2007 R2?

  - by bwerks

  Hey all, I recently set up SCOM in a small business network environment. The root management server is a Dell Poweredge 2950, and I'd like to use SCOM to monitor it using Dell's management packs. I've imported the management packs into the SCOM deployment and followed Dell's installation instructions, but it doesn't seem to be fully working yet. Currently, the Diagram views in the Dell tree (Monitoring tab) seem to show me the server's place in the network topology, so it seems that at least part of it is working. However, none of the reports under "Performance and Power Monitoring Views" provide any information. When clicking on one of them (Power Consumption (Watts), for instance), the display area is blank and there is a tooltip visible that reads "No performance counter is selected. To select a counter, place a check mark in the Show column in legend below." However, in the legend, there's nothing there for me to check. I've installed OpenManage 6.2 on the server as per the Dell documentation, but I don't know what else I could have done that I missed. Does this sound like a familiar problem to anyone?

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• How do I host multiple independent, secured SharePoint sites (WSS 3.0) without using Active Director

  - by Kyle Noland

  I have a SharePoint site set up on one of my networks to service Active Directory users. To be clear, this is a Windows SharePoint Services 3.0 installation running on Windows Server 2003 Standard. It is not an option to upgrade the server or SharePoint version. Management would like to create several new sites, one for each of a handful of clients. These sites will be used like "dropboxes" or FTP sites so that my company can make large files available to outside contacts, and vice versa. Here are my requirements: I do not want to have to create Active Directory accounts for each external contact. If possible, I would like to store the external usernames and passwords in a database that I can write a small GUI for so that management can handle adding their own external contacts. Each client site must be sandboxed from each other and from my main company SharePoint site. I would like to keep everything running on port 80 and be able to access the sites as either clientname.mycompany.com or www.mycompany.com/clientname If anybody has ever done this I would really appreciate hearing about any lessons you learned and suggestions for how to set this up. Kyle

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• Performance of file operations on thousands of files on NTFS vs HFS, ext3, others

  - by peterjmag

  [Crossposted from my Ask HN post. Feel free to close it if the question's too broad for superuser.] This is something I've been curious about for years, but I've never found any good discussions on the topic. Of course, my Google-fu might just be failing me... I often deal with projects involving thousands of relatively small files. This means that I'm frequently performing operations on all of those files or a large subset of them—copying the project folder elsewhere, deleting a bunch of temporary files, etc. Of all the machines I've worked on over the years, I've noticed that NTFS handles these tasks consistently slower than HFS on a Mac or ext3/ext4 on a Linux box. However, as far as I can tell, the raw throughput isn't actually slower on NTFS (at least not significantly), but the delay between each individual file is just a tiny bit longer. That little delay really adds up for thousands of files. (Side note: From what I've read, this is one of the reasons git is such a pain on Windows, since it relies so heavily on the file system for its object database.) Granted, my evidence is merely anecdotal—I don't currently have any real performance numbers, but it's something that I'd love to test further (perhaps with a Mac dual-booting into Windows). Still, my geekiness insists that someone out there already has. Can anyone explain this, or perhaps point me in the right direction to research it further myself?

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• Cannot connect to local network shares when connected to VPN. Error: "the user name could not be found"

  - by Nick G

  I keep finding that on our small company LAN (7 users, 3 servers) that some servers keep becoming "not accessible" for the purposes of file sharing. They display the message "\SERVER is not accessible. You might not have permission to use this network resource. The user name could not be found". But I don't know why "the user name could not be found" as all the machines are on the same domain and the PDC and BDC seem to be behaving OK. EDIT: VPN seems to be the cause: It turns out I can see the server if I use the IP address (\\1.2.3.4\ etc) or the FQ active directory name (eg \server.domainname.local) but not if I use the server name on its own or a mapped network drive originally created from the "short" name. Oddly though, my machine has no issue resolving the server's DNS name as I can ping the machine name OK and it immediately comes back with the IP, however nslookup seems to fail. It seems to be a problem with how Windows looks up machine names when connected to VPNs. When I'm connected to a VPN, windows seems to use the DNS assocated with the VPN and not the one on the domain controller. This behavior to me, seems incorrect as surely that would mean connecting to any VPN would break any ability to lookup local machine names for servers and printers etc. So I guess the real question now is, how can I make my machine still search the local Active Directory DNS (the PDC) even when connected to a VPN? More info in my comments below.

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• Why do AWS spot-instance prices spike above the "on demand" pricing?

  - by Laykes

  Amazon Pricing on Spot Instance Inconsistencies This is something which will be best explained through screenshots of a historical chart of instance pricings. If you look at a lot of the instance prices for spot instances, you will notice regular patterns of spikes. See here: As you can see, the price for this compute medium instance, regularly spikes above the on demand price. A c1.medium instance (on demand), would only cost $0.186 per hour. But for a period of a few weeks, in zone B, the price would regularly spike to $1.20. This is some 6 times the actual on demand price. It's also not isolated. If you look at zone-b again for small instances, there is a similar, spike frequently. Which goes 4x the on demand pricing. Does anyone know why this happens? Here are a few suggestions Someone entered $1.2 instead of $0.12 (I would discount this since it happened 20 times over the space of 3 weeks). Amazon regularly artifically inflate their prices by bidding on their own instances to get the most bang for their buck. (I would discount this since it would be ridiculous and bad business) Some company launched 1000 servers at once, and wants to make sure that they all launch. (I would discount this since they would presumably launch them at a price which would be below the minimum on demand price. Why would you pay above on demand for a single server?). It's a bug in their reporting?

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• How does it hurt to use Linux (Ubuntu) as a guest OS for all my tasks?

  - by sauparna

  I have a machine running Windows, where the disk has two partitions C (50 GB) and D (250GB). I do research in Information Retrieval and need to work with a large corpus (more than 50 GB) and in Linux. So if I want to install Linux on the existing system, keeping the Windows installation intact, will it be fine to run it in a virtual box? (say, QEMU, VMWare, etc.) An alternative is using Wubi. In that case the Linux installation has to be on drive C. Then, if I keep a small Linux installation (say 5GB) on C, and my corpus on D (mounted in Linux), how will it affect the performance of my programs which would be accessing the mounted Windows drive D. Is it feasible to use Linux this way? Which of the above is better if at all they are a way out? Note : Since my post in July 2010, I have been using and have tried several ways of maintaining a disk-image that I can mount in Linux. I had a 100GB qcow2 disk and a 100GB raw disk, both formatted to an EXT3 file system. I was mounting and connecting to the qcow2 disk using qemu-nbd. The problem was that every now and then, the connection to the disk would get lost and the running programs would throw disk I/O errors. The raw disk would mount and work fine as a loop mounted device, but when writing data to it, the mount.ntfs program would hog the CPU and the process would take an enormous amount of time. I was in fact running make on a piece of software located on this raw disk, and after a point of time make was waiting while mount.ntfs would show 100% CPU usage.

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• Recommended motherboard with hardware raid for Linux

  - by luison

  Hi. We want to setup an internal office server for testing jobs (LAMP), email and samba. Only about 5-10 users. We are also considering starting to virtualize, initially by a base Ubuntu Server with Xen or VMWare Open Source server. Our current system runs with a Linux Raid which has worked great but it's always been complicated to recover the boot sector when one the drives fail and therefore I would prefer using now a hardware raid instead, but ideally with some kind of software monitoring. For this reason and considering we don't want to spend a fortune a I would appreciate any comments on the following options. Motherboard with RAID with linux support... which could you recommend. Motherboard + Hardware Raid card... Adaptec does not seem to have great Linux suppport. 3Ware seems to have a tc soft controller which we've used on a hosting company, but hard to find here in Spain. HP Proliant type basic server, which? Dell Small Servers... any good for Linux? Thanks in advance for any feedback.

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