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• How can I write an XML on my hard drive to GetRequestStream

  - by swolff1978

  I need to post raw xml to a site and read the response. With the following code I keep getting an "Unknown File Format" error and I'm not sure why. XmlDocument sampleRequest = new XmlDocument(); sampleRequest.Load(@"C:\SampleRequest.xml"); byte[] bytes = Encoding.UTF8.GetBytes(sampleRequest.ToString()); string uri = "https://www.sample-gateway.com/gw.aspx"; req = WebRequest.Create(uri); req.Method = "POST"; req.ContentLength = bytes.Length; req.ContentType = "text/xml"; using (var requestStream = req.GetRequestStream()) { requestStream.Write(bytes, 0, bytes.Length); } // Send the data to the webserver rsp = req.GetResponse(); XmlDocument responseXML = new XmlDocument(); using (var responseStream = rsp.GetResponseStream()) { responseXML.Load(responseStream); } I am fairly certain my issue is what/how I am writing to the requestStream so.. How can I modify that code so that I may write an xml located on the hard drive to the request stream?

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• Hard Drive POV clock

  - by SkinnyMAN

  I am building a hard drive POV clock. (google it, they are pretty cool) I am working on the code for it, right now all i want to do is get the hang of making it do simple patterns with the RGB leds. I am wondering if anyone has any ideas on how to do something simple like make a red line rotate around the platter. right now what i have is an interrupt that triggers a function. int gLED = 8; // pins for RGB led strip int rLED = 9; int bLED = 10; attachInterrupt(0, ledPattern, FALLING); void ledPattern(){ digitalWrite(gLED, HIGH); // This will make a stable image of slice of the delayMicroseconds(500); // platter, but it does not move. digitalWrite(gLED, LOW); } That is the main part of the code (obviously I cut some stuff out that arduino requires) What I am trying to figure out is how can make that slice rotate around the platter. Eventually I will make the pattern more interesting by adding in other colors. Any Ideas?

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• Daemon Tools Lite Error- Unable to add adapter

  - by Lirik

  I just got a ThinkPad T510 with Windows 7 Professional and I installed Daemon Tools Lite, but I keep getting an error when I run it: Unable to add adapter. I tried starting it as an administrator, but I got the same problem. Does anybody know how to fix this?

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• How do I mount a "GPT Protective Partition" in Windows XP?

  - by Michael Haren

  I formatted an external USB harddrive while it was connected to a 32-bit Windows 2003 Server Std. edition server. After loading it up with files, I moved it to my Windows XP SP3 where it didn't show up automatically in My Computer. I opened up Computer ManagementDisk Management and see it listed as a "Health (GPT Protective Parititon)". What's up with that? Can I mount it?

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• Ubuntu doesn't detect drives conected to LSI "Host Bus Adapter"

  - by dvrecmfo

  I purchased LSI SAS 9300-4i Host Bus Adapter, from card bios I can see that it detected all hard drives connected to it, but from ubuntu I can't see them. What I've tried: Installed the driver provided here http://www.lsi.com/products/host-bus-adapters/pages/lsi-sas-9300-4i.aspx#tab/tab3 (I tried both LINUX_RH_SL_OEL_CTX_MPT_GEN3_C0_Phase2.0-3.00.00.00-1 and Linux_Driver_RHEL5-6_SLES10-11_P1) lspci | grep -i lsi 07:00.0 Serial Attached SCSI controller: LSI Logic / Symbios Logic SAS3004 PCI-Express Fusion-MPT SAS-3 (rev 02)

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• CloneZilla PXE Boot Without NFS

  - by John

  I am trying to setup CloneZilla to be bootable via PXE without using NFS. I do not have NFS running on our PXE server and would like to keep it that way. However, most of the information that I have found online indicates that you need to setup NFS in order to PXE boot CloneZilla. I believe that I am pretty close in getting it to work, but am not sure where to go next. Listed below are the different PXE menu option configurations that I have used so far. LABEL Clonezilla Live MENU LABEL Clonezilla Live KERNEL utilities/clonezilla/vmlinuz APPEND initrd=utilities/clonezilla/initrd.img boot=live live-config noswap nolocales edd=on nomodeset ocs_live_run="ocs-live-general" ocs_live_extra_param="" ocs_live_keymap="" ocs_live_batch="no" o$ I have also tried the following append lines, without success: APPEND initrd=utilities/clonezilla/initrd.img boot=live union=aufs noswap noprompt vga=788 fetch=tftp://10.130.155.23/filesystem.squashfs APPEND initrd=utilities/clonezilla/initrd.img boot=live union=aufs noswap noprompt vga=normal nomodeset nosplash fetch=tftp://10.130.155.23/filesystem.squashfs Each of them have resulted in a no go with the following error: "Unable to find a live file system on the network". It looks like it gets to the point of trying to load the filesystem.squashfs file, hangs, and then throws the error. Any help would be greatly appreciated.

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• Not Playing Nice Together

  - by David Douglass

  One of the things I’ve noticed is that two industry trends are not playing nice together, those trends being multi-core CPUs and massive hard drives.  It’s not a problem if you keep your cores busy with compute intensive work, but for software developers the beauty of multi-core CPUs (along with gobs of RAM and a 64 bit OS) is virtualization.  But when you have only one hard drive (who needs another when it holds 2 TB of data?) you wind up with a serious hard drive bottleneck.  A solid state drive would definitely help, and might even be a complete solution, but the cost is ridiculous.  Two TB of solid state storage will set you back around $7,000!  A spinning 2 TB drive is only $150. I see a couple of solutions for this.  One is the mainframe concept of near and far storage: put the stuff that will be heavily access on a solid state drive and the rest on a spinning drive.  Another solution is multiple spinning drives.  Instead of a single 2 TB drive, get four 500 GB drives.  In total, the four 500 GB drives will cost about $100 more than the single 2 TB drive.  You’ll need to be smart about what drive you place things on so that the load is spread evenly.  Another option, for better performance, would be four 10,000 RPM 300 GB drives, but that would cost about $800 more than the singe 2 TB drive and would deliver only 1.2 TB of space. All pricing based on Microcenter as of March 14, 2010.

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• What happens when the USB key or SD card I've installed VMware ESXi on fails?

  - by ewwhite

  An SD (SDHC) card installed in an HP ProLiant DL380p Gen8 server running VMware ESXi just failed. I encountered some rather ominous looking messages on the vCenter console and in the HP ProLiant ILO event log... Lost connectivity to the device ... backing the boot filesystem. As a result, host configuration changes will not be saved to persistent storage. Embedded Flash/SD-CARD: Error writing media 0, physical block 848880: Stack Exception. VMware advocates the use of USB and SD (SDHC) boot devices for ESXi. It was one of the main reasons the smaller footprint ESXi was developed (versus the older ESX). I've spent much time highlighting the differences between ESXi's installable and embedded modes to coworkers and clients. However, these failures do seem to happen. In this case, this is my third instance. Luckily, this is a vSphere cluster with SAN storage. What steps should be taken to remediate this failure?

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• how to make a multiboot usb key ?

  - by zillion

  I wanna cut my 8 gb usb key into several partitions to use wintoflash for a windows xp (maybe nlited before) and I wanna put also the Framakey ubuntu-fr remix pack into it has the second bootable OS and tweak and mod it a little cause if I can I wanna switch ubuntu 9.04 included to the LTS version ... So someone know how to do it easily ??? IMP : in short I wanna make a dual-boot usb key with windows xp sp3 and ubuntu 8.04.3 LTS ...

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• what is acceptable datastore latency on VMware ESXi host?

  - by BeowulfNode42

  Looking at our performance figures on our existing VMware ESXi 4.1 host at the Datastore/Real-time performance data Write Latency Avg 14 ms Max 41 ms Read Latency Avg 4.5 ms Max 12 ms People don't seem to be complaining too much about it being slow with those numbers. But how much higher could they get before people found it to be a problem? We are reviewing our head office systems due to running low on storage space, and are tossing up between buying a 2nd VM host with DAS or buying some sort of NAS for SMB file shares in the near term and maybe running VMs from it in the longer term. Currently we have just under 40 staff at head office with 9 smaller branches spread across the country. Head office is runnning in an MS RDS session based environment with linux ERP and mail systems. In total 22 VMs on a single host with DAS made from a RAID 10 made of 6x 15k SAS disks.

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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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• ZFS - zpool ARC cache plus L2ARC benchmarking

  - by jemmille

  I have been doing lots of I/O testing on a ZFS system I will eventually use to serve virtual machines. I thought I would try adding SSD's for use as cache to see how much faster I can get the read speed. I also have 24GB of RAM in the machine that acts as ARC. vol0 is 6.4TB and the cache disks are 60GB SSD's. The zvol is as follows: pool: vol0 state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM vol0 ONLINE 0 0 0 c1t8d0 ONLINE 0 0 0 cache c3t5001517958D80533d0 ONLINE 0 0 0 c3t5001517959092566d0 ONLINE 0 0 0 The issue is I'm not seeing any difference with the SSD's installed. I've tried bonnie++ benchmarks and some simple dd commands to write a file then read the file. I have run benchmarks before and after adding the SSD's. I've ensured the file sizes are at least double my RAM so there is no way it can all get cached locally. Am I missing something here? When am I going to see benefits of having all that cache? Am I simply not under these circumstances? Are the benchmark programs not good for testing the effect of cache because of the the way (and what) it writes and reads?

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• How to roll-your-own live CD for safe home browsing

  - by user36533

  Hi, I'm interested in booting-off-flash (i.e. like livecd) for more secure online banking at home. -I like system rescue CD, but AFAIK it doesn't have the wifi drivers. (These are convenient) -ubuntu live cd has the wi-fi drivers, but also has a lot of stuff I don't need -I'd like a way to save some basic config settings (e.g. wifi SSID and passphrase), so that wifi works upon startup, i.e. without having to re-enter the settings. What's the best way to 'roll my own slightly-customized boot-from-flash live cd? thanks, bill

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• How to fix an SSD

  - by anonymous

  I have a Samsung 128 go SSD : MZ5PA128HMCD-01000. When I'm using it : there is always I/O errors. I tried to secure-erase it. But it is impossible to create a new NTFS (or any filesystem...) partition because I still get I/O errors. I tought maybe upgrading the firmware will solve the problem. Unfortunately, I'm not able to upgrade the firmware with Samsung SSD Magician Tool ... because Magician says there is no Samsung SSD on my computer... Is there a way to make Magician recognize this Samsung MZ5PA128HMCD-01000 SSD? Is another tool available to flash any firmware on a SSD? What should I do to fix this SSD?

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• Self-powered USB hub and power supply adapter ampere capacity

  - by galacticninja

  I am looking for a power supply adapter for my USB Hub so it can support at least 2 bus-powered external hard drives. The hub's rating is 5 volts, 2 amperes. I would like to know if it would be OK to buy a power supply adapter rated at less than 2A. I've been looking for power supply adapters and the ones that do support 2A are more expensive (more expensive than the USB hub itself) compared to those that support less than 2A. Will power supply adapter that supports less than 2A (~1-1.5A) work fine to support two external hard drives? The external hard drives are both bus-powered Western Digital My Passport Essentials 250 GB. The OS is Windows XP SP3.

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• Recovering with DDRescue Cannot Complete (write error: Read-only file system)

  - by c00lryguy

  I'm trying to recover a corrupt VDI using vdfuse to mount the VDI and using dd_rescue to rescue the borked partition. dd_rescue seems to be working fine but once it reached about half of the partition, it just STOPs and gives the following error: ddrescue: write error: Read-only file system Wait.. what? It suddenly turns the FS it is writing the recovered partition to into a read-only file system. Well... why? Will I never be able to finish this? What's going on?

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• ubuntu hardrive repartition without uninstalling ubuntu or windows 7 and losing data of hardrive

  - by user141692

  I have and asus r500v with 750 gb gpt system uefi motherboard core i7 3610qm, nvidia geforce gt, with ubuntu and w7 dual boot, I had problems installing ubuntu because of the grub but I fix it with https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/807801, but I still have the problem of "warning: the partition is misaligned by 3072 bytes. this may result iin very poor performance. Repartitioning is suggested" in every linux partitioin I made and my 750 gb is not being used at the maximun capacity it only uses 698 gb. I want to make partitions so that the warning doesnt show up and I can use the maximum capacity of the HDD, as I did with another dual boot laptop (compaq presario cq40). I have the following partitions: unknown 1.0Mb: partition type: lynux Basic DAta partition, device: /dev/sda2 Usage: --, Partition flags: --, partition label:-- warning: the partition is misaligned by 3072 bytes. this may result in very poor performance. repartitioning is suggested. -system 210 Mb FAt, usage: Filesystem, partition type: EFI system Partition, Partition Flags:--, Label: system, Device: /dev/sda1, partition label: EFI system partition, Capacity 210MB, avilable:--, Mount Point: mounted at /boot/efi -134 Mb NTFS, usage: filesystem, partition type: linux basic data partition, partition flags:.--, device: /dev/sda7, partition label: --, capacity: 134MB,available:--, mount point: not mounted -OS 250 GB NTFS, usage: file system, partititon type: linux basic data partition, partition flags: --, type: NTFS, label: OS, device: /dev/sda3, partition label: basic data partition, capacity: 250 GB, available:-, mount point: not mounted -10GB FAT 32, usage: filesystem, partition type: EFI system partition, partition flags:--, type: FAT 32, label: --, device: /dev/sda4, partition label: --, capacity: 10GB, available:--, mount point: not mounted warning: the partition is misaligned by 3072 bytes. this may result in very poor performance. repartitioning is suggested. -10gb ext 4, usage: file system, partition type: linux basic data partition, partition flags:--, type: EXT4(version1) label:--, device: /dev/sda9, partition label:--, capacity: 10 GB, available:--, mount point at / warning: the partition is misaligned by 1536 bytes. this may result in very poor performance. repartitioning is suggested. -478GB ext4, usage: filesystem, partition type: linux basic data partition, partition flags:--, type: EXT4, label:--, device: /dev/sda5, partition label:--, capacity: 478gb, available:--, mount point: mounted at /home warning: the partition is misaligned by 512 bytes. this may result in very poor performance. repartitioning is suggested. -2.0gb Swap 2.0Gb, usage: swap space, partition type: linux swap partitioin, partition flags:-, device: /dev/sda6, partition label: capacity: 2.0gb warning: the partition is misaligned by 512 bytes. this may result in very poor performance. repartitioning is suggested. and as you can see it is not well organized so please help me to organize the partitions witahout uninstalling the w7, and if possible the grub2

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• MD3200 - 3 to 4x less throughput than MD1220. Am I missing something here?

  - by Igor Polishchuk

  I have two R710 servers with similar configuration. One in my office has MD1220 attached. Another one in the datacenter of my hosting services vendor has MD3200. I'm getting significantly worse throughput from MD3200 at my vendors setup. I'm mostly interested in sequential writes, and I'm getting these results in bonnie++ and dd tests: Seq. writes on MD1220 in my office: 1.1 GB/s - bonnie++, 1.3GB/s - dd Seq. writes on MD3200 at my vendor's: 240MB/s - bonnie++, 310MB/s - dd Unfortunately, I could not test the exactly the same configurations, but the two I have should be comparable. If anything, my good performing environment is cheaper than the bad performing. I expect at least similar throughput from these two setups. My vendor cannot really help me. Hopefully, somebody more familiar with the DAS performance can look at it and tell if I'm missing something here and my expectations are too high. To summarize, the question here is it reasonable to expect about 100MB/s of sequential write throughput per each couple of drives in RAID10 on MD3200? Is there any trick to enable such performance in MD3200 with dual controller as opposed to simple MD1220 with a single H800 adapter? More details about the configurations: A good one in my office: Dell R710 2CPU X5650 @ 2.67GHz 12 cores 96GB DDR3, OS: RHEL 5.5, kernel 2.6.18-194.26.1.el5 x86_64 20x300GB 2.5" SAS 10K in a single RAID10 1MB chunk size on MD1220 + Dell H800 I/O controller with 1GB cache in the host Not so good one at my vendor's: Dell R710 2CPU L5520 @ 2.27GHz 8 cores 144GB DDR3, OS: RHEL 5.5, kernel 2.6.18-194.11.4.el5 x86_64 20x146GB 2.5" SAS 15K in a single RAID10 512KB chunk size, Dell MD3200, 2 I/O controllers in array with 1GB cache each Additional information. I've also ran the same tests on the same vendor's host, but the storage was: two raids of 14x146GB 15K RPM drives RAID 10, striped together on the OS level on MD3000+MD1000. The performance was about 25% worse than on MD3200 despite having more drives. When I ran similar tests on the internal storage of my vendor's host (2x146GB 15K RPM drives RAID1, Perc 6i) I've got about 128MB/s seq. writes. Just two internal drives gave me about a half of 20 drives' throughput on MD3200. The random I/O performance of the MD3200 setup is ok, it gives me at least 1300 IOPS. I'm mostly have problems with sequentioal I/O throughput. Thank you for looking into it. Regards Igor

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• ext4 jbd2 journaling active even on empty filesystem

  - by Paul

  I have been having several issues with my ext4 filesystems that seem to be due to jbd2 journaling. I made a related post here and am rephrasing it with the hope that someone may be able to help. For a minimal example, I start with an empty 8gb USB stick and use gparted to create one ext4 partition. The command used by gparted when creating the ext4 file system is: mkfs.ext4 -j -O extent -L DataTraveler8gb /dev/sde1 I check the filesystem with gparted: e2fsck -f -y -v /dev/sde1 and I mount it: sudo mount /dev/sde1 /media/test The disk is empty, but the journaling is very active on this disk (/dev/sde1). The other disks are ext4 SSDs formatted similarly. A snapshot of iotop: % sudo iotop -oPa Total DISK READ: 0.00 B/s | Total DISK WRITE: 2027.21 K/s PID PRIO USER DISK READ DISK WRITE SWAPIN IO COMMAND 262 be/3 root 0.00 B 56.00 K 0.00 % 0.18 % [jbd2/sda1-8] 29069 be/3 root 0.00 B 0.00 B 0.00 % 0.16 % [jbd2/sde1-8] 891 be/3 root 0.00 B 4.00 K 0.00 % 0.03 % [jbd2/sdc1-8] What is jbd2 doing with /dev/sde1? If I follow the same steps with a larger 2Tb disk, iotop indicates this empty disk is constantly being written to by jbd2 at the rate of Mb/s as soon as I mount it. On the other disks, which have the OS and /home, I have tried to find if any files are being modified by processes to cause this behavior but couldn't find any. I also moved many of the disk intensive process to use a tmpfs. And used noatime. I have another non-SSD hard disk on this machine, /dev/sdb, that is also ext4 but was not formatted by gparted (given to me by a coworker). It does not appear in iotop. So I am assuming there an issue with gparted. Any suggestions are appreciated. Also any tips on how to modify existing partitions to fix the issue without having to start from scratch would be great. There are some posts related to jbd2 but they didn't help (eg. here).

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• What would I need to do to clone a Linux install to another machine?

  - by Marcus Hughes

  Basically, I want to make an image of one Linux install I have, and distribute it over similar (if not identical) spec machines on a network. I know it is possible, however am unsure of what needs to be done before I make the image of the install to ensure it works correctly on all machines. First think I know needs to be done, is remove all interface configuration, as I assume it would just jump to eth1 (and possibly use the same MAC), as it wont locate the network interface it had before, how would I do this so it auto detects and goes to eth0 again? Is there anything else I would need to do to the install before I make its image?

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• Creating/Editing Existing Documents

  - by Caroline Jones

  A document was shared with me, enabling me to edit it. However, whenever I open it, it only lets me view it, and anytime I try to open the "Open with Google Docs" tab, it acts as if I never pressed it, same as if I try to download it. Same with whenever I try to create a new document. I'll click "Create" and then "Document" and it won't be registered. I really need these issues fixed pronto, as I have to use this software every day. Please help!!

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• Cleaning up temp files in Mac OS X

  - by deddebme

  I was a Windows person for more than 10 years. Around 4 months ago, I switched to Mac, and I have never looked back. But there is one thing that bothers me, which is my Mac partition volume is losing space slowly and gradually. I am pretty sure there are a lot of orphaned temporary files laying around in the volume. I know where to find the obsoleted temp files in my Windows partition, how about in Mac OSX?

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• Google Play Music Not Adding MP3s On-Demand

  - by J0e3gan

  My recent attempts to add music on-demand to Google Play Music have yielded nothing - no "Processing music..." or "Added __ of __" messages, just nothing. Previously I could add music on-demand; and nothing has changed on the machine from which I successfully added music previously, from which I have tried to add music on-demand recently. What could be hampering my ability to add music on-demand? WHAT I'VE TRIED: Right after I started using GPM, I briefly found that I could not add music (on-demand), but the problem went away after a logout/login. This time a logout/login has not helped. Dragging & dropping or browsing to folders or files to add has made no difference either. Nor has waiting ridiculously long for GPM to show signs of life after adding music on-demand seemed to work. Digging deeper, I read a related Google Play Help article and followed its suggestions... ran the Google Play Music Manager troubleshooter = no errors or warnings double checked my available storage = 8 GB free double checked supported file types = MP3 is still supported (of course) ..., but the problem remains. UPDATE: I found that if I configure GPM to automatically upload music added to specific folders, it strangely does add automatically what it will not add on-demand.

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• Are there any Microsoft Exchange Clients for iOS and Android that store their local data in an encrypted manner?

  - by Zac B

  I don't feel like this is a product recommendation question, more of a "does this tech even exist and is it feasible" question, but if I'm wrong, feel free to give this question the boot. Context: Our company has a bunch of traveling employees who access the company's Exchange server via thier iDevices or android phones, but because of the data protection laws in the state where our company is based (and the nature of the data our company works with), a recent security audit found that all mobile devices (laptops, phones, etc) operated by our company need to have all company correspondence and related data encrypted all the time. For laptops, that was easy: BitLocker or TrueCrypt, problem solved. For phones and tablets, however, I'm stumped. Sure, you can put lock screens/passwords on the phones, but the data is still accessible via external extraction, as law enforcement authorities already know. Question: Are there any clients for Microsoft Exchange that run on iOS or Android which store local data encrypted? The people using our mobile devices do a lot of their work while offline, so just giving them OWA access with SSL connection security isn't enough. Are there apps/technologies that present an additional login credential prompt to decrypt locally stored data in the app's storage area on the phone? My gut reaction when I started looking into this was "that doesn't sound like something Apple would allow into the App Store", but I've been wrong before...

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• Is Splitting IDE hdds between Primary and Secondary faster?

  - by earlz

  Hello, I'm doing RAID 0 on two IDE harddrives (yes, this is old hardware). Will the harddrives be faster if I attach them separately so that one is on the Primary IDE controller and the other is on the Secondary IDE controller? Or would it just be as good as having them both on the Primary IDE as master and slave?

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