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• Parallel File Copy

  - by Jon

  I have a list of files I need to copy on a Linux system - each file ranges from 10 to 100GB in size. I only want to copy to the local filesystem. Is there a way to do this in parallel - with multiple processes each responsible for copying a file - in a simple manner? I can easily write a multithreaded program to do this, but I'm interested in finding out if there's a low level Linux method for doing this.

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• 2 SAN disks failing during the same overnight period

  - by Carl

  We have 2 HP Lefthand SAN servers in separate data rooms. Last week each of the SANs had 1 hard disk fail. They were in different positions on the SANs. Both data rooms are very well protected from power issues with UPS. Any ideas of what could have influenced this? Thanks, Carl

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• Sensitive data deletion (remote)

  - by José Antonio Silva

  Hi, I'm just finished my Amazon EC2 migration and I want to delete all the files (databases, source code) from the old servers. The problem is that the servers are in California and my business is in Chile, soo I only have ssh access to that servers. I'm planning to sell the servers and I'm wondering if there is a way to perform a low levele deletion remotely of the specific files and folders. Thanks in advance! José Antonio

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• HP DL380 G7 Disk swap to a HP DL380 G6

  - by rnuno

  The HP DL380 G7 has 3 SAS disks in RAID 5 configuration. I need to change that server to another task and instead of make a clean install on the HP DL380 G6 can i just swap the 3 disks from HP DL380 G7 to the HP DL380 G6? I expect some driver issues maybe on the OS itself because the processor is different. They both use Smart Array P410i, if i power down the machines swap the disk by the same order will the RAID 5 configuration remain and the OS will boot?

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• Ruby on Rails on Windows - IIS 7 or IIS 6?

  - by Jon

  I have seen a few places ( one example ) that there are newer speed improvements in IIS 7 on Windows 2008. While I know we would see possibly more power running ruby on rails under a Linux machine, the requirements depend on me using Windows. I was wondering if anyone knew the best setup for Ruby/Rails in a Windows environment. This machine will mainly be running a redmine.org instance.

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• Implications of using many USB web cameras

  - by Martin

  I'm looking into connecting multiple low resolution USB webcams to a single computer. What implications might this have on performance? How does, for example, four 320x240 cameras fare against a single 640x480 camera? I'm not well versed in the architecture of the USB interface, what are the performance caveats? By performance I mean how would it affect the time to read the image data from multiple cameras compared to a single one.

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• setting up Windows 2008 STD EN on dedicated server

  - by sunny

  Dear experts, I just purchased a dedicated server and i need to setup for hosting my website. Please help me how do i setup the server step by step. server details : Windows 2008 STD EN SQL Server Web 2008 Core2 Quad 2.4GHz 6GB RAM Single-Power 150GB Velociraptor 10K RPM Please help me for : 1.Setting up server and hosting website 2.Email settings 3.How to set DNS as domain is from another host. regards, Sunny

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• Burnt SATA Drive

  - by luvieere

  By stupid curiosity, I've connected the FDD power cable to the jumper pins of a SATA drive, and powered on the system. The SATA drive's controller burned out. What now? Can it be replaced, and still be able to read the disc?

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• How to run a VMWare Server virtual machine in a ESXi virtual machine?

  - by CHUCO

  I installed VMWare Server 2 in a Centos 5.2 virtual machine which runs in a VMWare ESXi Server. When I try to start, via browser, a VM I created in VMWare Server, it gives me the following message: "You may not power on a virtual machine in a virtual machine.". Is there a way to put the VM to work?

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• How to rate-limit in nginx, but including/excluding certain IP addresses?

  - by Jason Cohen

  I'm able to use limit_req to rate-limit all requests to my server. However I'd like to remove the rate restriction for certain IP addresses (i.e. whitelist) and use a different rate restriction for certain others (i.e. certain IPs I'd like as low as 1r/s). I tried using conditionals (e.g. if ( $remote_addr = "1.2.3.4" ) {}) but that seems to work only with rewrite rules, not for rate-limit rules.

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• On Windows Server 2008, how to troubleshoot IIS hang when CPU, Disk IO are normal?

  - by frankadelic

  Can someone recommend a good strategy for troubleshooting IIS that is hanging on Windows 2008? Normally, I check the following in Process Explorer: CPU Disk I/O Context Switch Delta However, in certain situations all of these values are low and yet IIS is hung up. Is there anything in Process Monitor (sysinternals) that should raise a red flag?

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• ubuntu 10.04 logs itself out overnight

  - by Corey

  Every night when I leave work, I lock the screen via ubuntu's "power" button in the top right hand panel. When I come to work in the morning, I'm greeted with the log-in screen. This doesn't happen every night, but most. I'm running ubuntu 10.04 on a Dell inspiron. I've included some HW specs, and also dmesg output. Please let me know what other logs may be useful. thanks! Corey ~$ dmesg [20559.696062] type=1503 audit(1285957687.048:16): operation="open" pid=6212 parent=1 profile="/usr/bin/evince" requested_mask="::r" denied_mask="::r" fsuid=1000 ouid=0 name="/usr/local/lib/libltdl.so.7.2.2" [21127.951621] type=1503 audit(1285958255.300:17): operation="open" pid=6390 parent=1 profile="/usr/bin/evince" requested_mask="::r" denied_mask="::r" fsuid=1000 ouid=0 name="/usr/local/lib/libltdl.so.7.2.2" [291038.528014] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung [291038.528025] render error detected, EIR: 0x00000000 [291038.528042] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 22973891 at 22973890) [291038.828014] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung [291038.828023] render error detected, EIR: 0x00000000 [291038.828042] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 22973894 at 22973890) ~$ lspci -vv 00:00.0 Host bridge: Intel Corporation 4 Series Chipset DRAM Controller (rev 03) Subsystem: Dell Device 02e1 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx- Latency: 0 Capabilities: <access denied> Kernel driver in use: agpgart-intel Kernel modules: intel-agp 00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset Integrated Graphics Controller (rev 03) Subsystem: Dell Device 02e1 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 27 Region 0: Memory at fe400000 (64-bit, non-prefetchable) [size=4M] Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M] Region 4: I/O ports at dc00 [size=8] Capabilities: <access denied> Kernel driver in use: i915 Kernel modules: i915 00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 01) Subsystem: Dell Device 02e1 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 32 bytes Interrupt: pin A routed to IRQ 16 Region 0: Memory at feaf8000 (64-bit, non-prefetchable) [size=16K] Capabilities: <access denied> Kernel driver in use: HDA Intel Kernel modules: snd-hda-intel 00:1c.0 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 1 (rev 01) Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 32 bytes Bus: primary=00, secondary=01, subordinate=01, sec-latency=0 I/O behind bridge: 00001000-00001fff Memory behind bridge: 80000000-801fffff Prefetchable memory behind bridge: 0000000080200000-00000000803fffff Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR- BridgeCtl: Parity- SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B- PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- Capabilities: <access denied> Kernel driver in use: pcieport Kernel modules: shpchp 00:1c.1 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 2 (rev 01) Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 32 bytes Bus: primary=00, secondary=02, subordinate=02, sec-latency=0 I/O behind bridge: 0000e000-0000efff Memory behind bridge: feb00000-febfffff Prefetchable memory behind bridge: 00000000fdf00000-00000000fdffffff Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR- BridgeCtl: Parity- SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B- PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- Capabilities: <access denied> Kernel driver in use: pcieport Kernel modules: shpchp 00:1d.0 USB Controller: Intel Corporation N10/ICH7 Family USB UHCI Controller #1 (rev 01) Subsystem: Dell Device 02e1 Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 23 Region 4: I/O ports at d880 [size=32] Kernel driver in use: uhci_hcd 00:1d.1 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #2 (rev 01) Subsystem: Dell Device 02e1 Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin B routed to IRQ 19 Region 4: I/O ports at d800 [size=32] Kernel driver in use: uhci_hcd 00:1d.2 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #3 (rev 01) Subsystem: Dell Device 02e1 Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin C routed to IRQ 18 Region 4: I/O ports at d480 [size=32] Kernel driver in use: uhci_hcd 00:1d.3 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #4 (rev 01) Subsystem: Dell Device 02e1 Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin D routed to IRQ 16 Region 4: I/O ports at d400 [size=32] Kernel driver in use: uhci_hcd 00:1d.7 USB Controller: Intel Corporation N10/ICH 7 Family USB2 EHCI Controller (rev 01) (prog-if 20) Subsystem: Dell Device 02e1 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 23 Region 0: Memory at feaf7c00 (32-bit, non-prefetchable) [size=1K] Capabilities: <access denied> Kernel driver in use: ehci_hcd 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1) (prog-if 01) Control: I/O- Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Bus: primary=00, secondary=03, subordinate=03, sec-latency=32 Secondary status: 66MHz- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ <SERR- <PERR- BridgeCtl: Parity- SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B- PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- Capabilities: <access denied> 00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01) Subsystem: Dell Device 02e1 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Capabilities: <access denied> Kernel modules: iTCO_wdt, intel-rng 00:1f.2 IDE interface: Intel Corporation N10/ICH7 Family SATA IDE Controller (rev 01) (prog-if 8f [Master SecP SecO PriP PriO]) Subsystem: Dell Device 02e1 Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin B routed to IRQ 19 Region 0: I/O ports at d080 [size=8] Region 1: I/O ports at d000 [size=4] Region 2: I/O ports at cc00 [size=8] Region 3: I/O ports at c880 [size=4] Region 4: I/O ports at c800 [size=16] Capabilities: <access denied> Kernel driver in use: ata_piix 00:1f.3 SMBus: Intel Corporation N10/ICH 7 Family SMBus Controller (rev 01) Subsystem: Dell Device 02e1 Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Interrupt: pin B routed to IRQ 5 Region 4: I/O ports at 0400 [size=32] Kernel modules: i2c-i801 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 02) Subsystem: Dell Device 02e1 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 32 bytes Interrupt: pin A routed to IRQ 26 Region 0: I/O ports at e800 [size=256] Region 2: Memory at fdfff000 (64-bit, prefetchable) [size=4K] Region 4: Memory at fdfe0000 (64-bit, prefetchable) [size=64K] Expansion ROM at febe0000 [disabled] [size=128K] Capabilities: <access denied> Kernel driver in use: r8169 Kernel modules: r8169 log$ tail -n 15 Xorg.0.log.old for help. Please also check the log file at "/var/log/Xorg.0.log" for additional information. (II) Power Button: Close (II) UnloadModule: "evdev" (II) Power Button: Close (II) UnloadModule: "evdev" (II) USB Optical Mouse: Close (II) UnloadModule: "evdev" (II) Dell Dell USB Entry Keyboard: Close (II) UnloadModule: "evdev" (II) Macintosh mouse button emulation: Close (II) UnloadModule: "evdev" (II) AIGLX: Suspending AIGLX clients for VT switch ddxSigGiveUp: Closing log

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• Using TLS-PSK on IIS

  - by ralu

  We are doing embedded device and due to low memory contraints and closed enviroment best option there would be using one of TLS-PSK ChiperSuites (pre shared key - no asymetric cryptography). As far as I see there is no TLS-PSK support in Schannel http://msdn.microsoft.com/en-us/library/aa374757%28VS.85%29.aspx but is there any way to use TLS-PSK on IIS?

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• URL to reboot a WebSTAR DPC2100R2 cable modem with curl?

  - by jtimberman

  Does anyone know what the magic URL is for rebooting a WebSTAR DPC2100R2 with curl? I used to have a SurfBoard, and the curl command: curl http://192.168.100.1/reset.htm?reset_modem=Restart%20Cable%20Modem Would reset the modem. Sure, I can go power cycle it manually, but it's in the basement and I'm lazy :-). I did find out the URL to elevate the access permission, but nothing about rebooting/resetting yet.

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• How to setup Mac OS Snow Leopard to Alert me When My Battery is Full?

  - by Daniel Silveira

  When the battery is low, Mac OS alerts me to plug it into the power supply. But, how to setup to alert me when the battery is full?

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• best tomcat hosting servrice provider for jsp

  - by akshay

  I want to host my website build using jsp/java.I am looking for a good host which offer following features. unlimited bandwidth (to support large traffic.I dont want to run slowely) low price` good customer care suport that can help me in deploying in case of any problems I am running tight on budget.As i am a university passout. `

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• How to increase the volume in an m4a file?

  - by Phenom

  I have an m4a file (actually m4b, but its the same thing), and when listening to it on my ipod touch the volume is too low, even when I turn it all the way up. I need to increase the volume in the file so that I can hear what is being said. Also in the background it sounds like there is a hissing sound that I'd like to get rid of.

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• Lynx web browser usage

  - by Andrew

  Does anyone still use the Lynx text-only web browser? It would seem useful for certain classes of low-end mobile devices, especially if one is billed per KB of data transfer.

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• Boost Audio Input on OS X?

  - by alanstorm

  I'm using my 13" Mac Book Pro's audio input functionality with an external microphone (recent vintage, bought around Thanksgiving). I've increased my input volume to the maximum in system preference, but the resulting recorded volume (using iShowU HD) is very low. Is there anyway to increase the input volume/sensitivity beyond Apple's default settings? I've found plenty on google about increasing the OUTPUT volume, but I want to increase the input volume.

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• mysql master-slave setup with synchronous replication

  - by imaginative

  I have a very trivial mysql master-slave setup going on between two servers. The problem is, replication is asynchronous, and this can cause issues (even on a low latency link), if the master server was to crash after a COMMIT before the replication thread from the slave was able to fetch the last bin log. Is there anyway to force mysql to do synchronous commits so that data consistency is guaranteed in a mysql-slave relationship?

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• Why does a hard disk suddenly look to Windows as if it "needs to be formatted"?

  - by pufferfish

  This is more of a theory question, but what are the reason(s) for a disk to suddenly cause Windows to start saying it "needs to be formatted"? It happens to an IDE disk that I have in a cheap external enclosure, and I can usually get most of the data back by using software like recuva. It's now happened to an internal disk I have. I'm not looking for software to fix this (although links would be appreciated), but rather a low-level explanation as to what gets corrupted on the disk.

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• Windows 7 does not wake up from sleep

  - by Eder Gusatto

  I upgraded my Vista Ultimate to Windows 7 Ultimate (RTM) and after that it doesn't wake up from sleep. When I power it on it turns on but nothing happens, but if I press the reset button it boots and then wakes up, I mean, it doesn't reboot Win 7, it actually wakes up. Anyone have any clue about such a weird behaviour? It always worked fine on Vista. I have a GForce 8600 with the latest drivers.

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• Disable IMAPI.exe Service in windows 7/vista

  - by Or betzalel

  I wanted to disable the IMAPI CD Burner service because I keep getting "Power Calibration Error". In windows XP, its throught services but I cant seem to find it anywhere in window 7/vista. Anyone have an idea how to disable/kill that service?

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• Is surge protection actually needed?

  - by andrew

  Am I am an idiot for not using a surge protected powerboard? Does this mean my computer gets fried in a power outage? Which particular parts of the computer are most vulnerable to damage if I get a 'surge'? Sorry for being a newb.

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• Client has been through 3 PSUs, now what?

  - by Moshe

  A client of mine has an XP era eMachines. The power supply has died and been replaced 3 times. I've discharged the motherboard and checked the surge protector. In the middle of a scan with ComboFix, the machine died. It powers on and hangs before the BIOS and shows a solid yellow light. I believe the model # is T5062 or something like that.

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