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• LVM2 vs MDADM performance

  - by archer

  I've used MDADM + LVM2 on many boxes for quite a while. MDADM was serving for both RAID0 and RAID1 arrays, while LVM2 where used for logical volumes on top of MDADM. Recently I've found that LVM2 could be used w/o MDADM (thus minus one layer, as the result - less overhead) for both mirroring and stripping. However, some guys claims that READ PERFORMANCE on LVM2 for mirrored array is not that fast as for LVM2 (linear) on top of MDADM (RAID1) as LVM2 does not read from 2+ devices at a time, but use 2nd and higher devices in case of 1st device failure. MDADM reads from 2 devices at a time (even in mirrored mode). Who could confirm that?

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• How to remove a partition on a USB drive?

  - by Nathan Long

  I got a free promotional USB stick that I want to format for my own purposes. When I inserted it, it automatically opened a browser and launched a web site. I have since disabled autoplay on this computer so that nothing launches when the stick is inserted. But it still shows up as two separate drives, and one of them is a "CD Drive" that I can't format. How can a USB stick contain a "CD Drive?" And more to the point, how can I remove this partition using Windows XP or Ubuntu? Update I previously asked for an XP solution, but finding none, I have tried Ubuntu, also without success. Gparted doesn't see the "CD" portion as a device at all, and from bash, any chmod changes I try tell me that the file system is read-only. Any ideas?

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• Do Seagate Momentus XT SSD Hybrid drives perform better than a good hard drive + flash on ReadyBoost

  - by Chris W. Rea

  Seagate has released a product called the Momentus XT Solid State Hybrid Drive. At a glance, this looks exactly like what Windows ReadyBoost attempts to do with software at the OS level: Pairing the benefits of a large hard drive together with the performance of solid-state flash memory. Does the Momentus XT out-perform a similar ad-hoc pairing of a decent hard drive with similar flash memory storage under Windows ReadyBoost? Other than the obvious "a hardware implementation ought to be faster than a software implementation", why would ReadyBoost not be able to perform as well as such a hybrid device?

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• Ubuntu not connecting to network in Hyper-V

  - by soandos

  I am unable to connect the Ubuntu guest (both 12.10 and 12.04) to the internet via hyper-V. Here is what I have done so far (with much thanks due to @Kronos's blog post on the topic): Created a switch in the switch manager with connection set to external, selected my wifi card (Intel Centrino Ultimate-N 6300 AGN). If it matters, the Microsoft Filtering Platform is checked under extensions. Added this switch to my Ubuntu guest. I also tried a different wireless card (Aethros 9285) same issue. Connecting through my wired card works just fine (assume that I select that card, and I am wired in of course). Making it a legacy network adapter does not fix the issue. Ubuntu can see this connection, but is unable to connect to it. What follows is what I attempted to do to get Ubuntu to connect: Start and restart the network manager Restart the machine Verify that it could in fact see the adapter (resulted in device not ready a few times) How can I get this to work properly?

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• win7 amd64 guest in kvm does not have sound

  - by davidshen84

  hi, my host system is gentoo amd64, guest system is win 7 amd64. the guest system can work, except it does not have sound. i start kvm with -soundhw ac97, QEMU_AUDIO_DRV='alsa', and after i get into the guest system, i can see a 'Multimedia Audio Controller' in the device manager. but win7 cannot find the driver for it. i searched the network for a long time, and i cannot find a driver for intel ac97 for win7 amd64. i also tried -soundhw sb16, es1370, none of them work. please help me fix this.

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• HD Video Capture Card w/ Good API?

  - by Sheep Slapper

  Does anyone here know of a good HD video capture card that has a good (comprehensive) API? I administer a few servers that do some video encoding right now, but when we make the switch to HD cameras, they won't be sufficient. In addition to this, the servers we have now are black boxes, closed to me except to start/stop the video capture device. I'd like to be able to roll my own, so we can better integrate it with our existing systems, but I know almost nothing about what kind of HD capture cards are out there, and if I can avoid spending money just to test their APIs that would rock. So does anyone have any experience with this? All our other software is in C#, and I'd like to set up the new servers with web interfaces to start/stop the capture (also in C#, using .NET 3.5 probably). I'm not sure how language specific these APIs would be, but that's what I'm working with just as a reference point. I appreciate any help the community can give!

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• Does any know fix/cause of USB drives that lose connection

  - by Burch Kealey

  I have been having significant problems trying to copy files to a USB drive (G0-Flex 1.5 tb) No matter what I use to try to copy the files (python code, Windows copy and paste or Drobo Copy utility) I ultimately get a failure. The failure is always some indication that the device is not ready or able to be written to. I am pretty sure the problem is that the drive is losing its connection. I have done everything I can find so far including setting the USB Root hub to never turn off the power, I updated some usb drivers etc. I have found references to this problem primarily with Win7-64 bit. I have also had USB connection problems with other devices- we kept losing a connection to our Bravo Disc Publisher when we went to Win7 and finally bought a newer model and have not had problems since. Any pointers about diagnosing and or understanding the problem would be appreciated.

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• Network bottleneck/throttling issue

  - by Gavin

  Hi all, It's my first day at a new company and i've been given the task to find out an issue with the internet connection. I noticed that whilst I was downloading a large file, the network grinds to a halt, except for my download. At first I thought it was the internet connection/modem but it seems that whilst the lockdown occurs, I am unable to access any network device. Has anyone experienced this before and if so, do you have any pointers? Looking at the setup. They have an DSL modem that connects to a 10/100 switch. There are only 5-6 computers on the network. Cheers Gavin

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• Windows 7 does not recognise second display output

  - by gilles27

  I've got a PC with dual BenQ G2222HDL monitors and an ATI Radeon HD 4650 video card. I've been running both monitors at 1920x1080 for some months now but last week the second monitor switched to a lower resolution and won't let me go back to 1920x1080. If I right click the Desktop and choose Screen Resolution from the menu, I get two items in the Display: drop down list BenQ G2222HDL D-SUB Display device on: VGA In the past 2 was always the same as 1. If I click Detect a third item appears Available display output on: ATI Radeon HD 4650 but if I use the Multiple displays: drop down list to use it says "No display detected" and then lets me choose from either "Connect anyway on S-Video" or "Connect anyway on Component", neither of which help. It seems like Windows 7 recognises the card is dual-head, and knows I have got two monitors, but can't link it all together. I have checked and all my drivers are up-to-date. Does anyone have any suggestions as to how I can get the second monitor working properly again?

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• Create new partition on live production CentOS server

  - by Kimmel

  I have a production server that is running on CentOS. I'd like to create a partition on the server without having to reinstall everything. I have CLI and VNC access to the remote server. Is there anyway that I can create a partition safely? Here's my output from fdisk -l Disk /dev/sda: 85.9 GB, 85899345920 bytes 255 heads, 63 sectors/track, 10443 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00033d5e Device Boot Start End Blocks Id System /dev/sda1 * 1 10444 83885056 83 Linux Thanks.

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• Wireshark (WinPCap) does not see Intel X520-DA2 10 GbE NIC teaming intermittently

  - by GregC

  I am running a team of two 10 GigE ports on Intel X520-DA2 network card. They work well in tandem and achieve the desired throughput. However, I see an intermittent issue whereby WireShark and my own application (using WinPCap) only show the underlying ports, failing to recognize the team adapter. Details: Intel 17.4 NIC drivers on Windows Server 2008 R2 with all patches. HP DL370 G6 server. RSS enabled on Intel both underlying Intel NICs. The exact error: Unable to open the adapter (rpcap://\Device\NPF_{401D5903-16E7-41DC-8484-5D96765B9692}). failed to set hardware filter to promiscuous mode

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• How do I use an internal SSD as a scratch disk for FCP X?

  - by andrewb

  I'm contemplating setting up my MacBook Air as a video editing machine. If I do this, I'll upgrade to a 256 GB SSD, and I should be able to keep around 100 GB or more free for video editing. The video files would of course be stored externally, but save purchasing some expensive Thunderbolt RAID device (which I suppose is gradually becoming more of an option), it will be slow for read/writes. How can I have a set up where I take advantage of my SSD's speed for a scratch disk/cache for FCP X, but still have the TB(s) of storage of externals? I don't want to have to be moving files constantly back and forth, this is about saving time not wasting it.

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• Why do my speakers get distorted randomly on Windows 7?

  - by Daniel Fischer

  I have a studio monitor setup. I have 2 KRK 6's and a Focusrite Firewire Pro 24. Every few hours my speakers sound distorted and my solution has been go to sound levels Properties of Saffire Audio Device Advanced Default Format Toggle to 16 bit then back to 24bit. Why does it screw up every few hours? Sometimes one speaker doesn't output too and this same process resets it but that's more rare. Is this a OS issue or Focusrite Driver Issue?

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• Juniper Networks SRX240 as a office router?

  - by Jordan Mendelson

  We're a small (7 person) fast growing startup who just got our new office and we're having a 100 Mbps line installed from Cogent. I'm not familiar with Juniper devices, however the equivalent Cisco appears to be rather expensive. Features we'd like: Offsite VPN access (PPTP or L2TP IPsec) - something Mac compatible IPv6 support NAT - ideally supporting multiple outside addresses mapped to VLANs DHCP DNS forwarding would be nice QoS to keep our SIP phones happy (managed through RingCentral) VLANs for guest/internal The device is going to be connected to a set of SIP phones as well as two Ruckus 7962s for wireless access. Eventually I'd like to connect it to a Juniper ESX switch as we grow. Would a Juniper SRX240 handle this ok?

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• Delay between printing via lp in opensuse

  - by adamweeks

  I am experiencing a 10-15 second delay when printing multiple documents to a barcode printer in opensuse. I have had the same setup on other systems with older versions of opensuse without any issue. The setup is as follows: The print queue is setup as a "generic with driver Raw Queue". The files being sent down to the printers are simple text files with the lp command: lp -dprinter1 /path/file The printer is a JetDirect compatible device (Intermec brand) with a standard 9100 port socket setup. If I send a multi-page document to the printer, it will print nonstop the multiple pages. If I send 2 or more text files down via separate "lp" commands, the delay will be there between each printout. I've tried multiple different printers and they all experience the same issue.

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• No sound on Debian unstable Intel Corporation 82801JD/DO (ICH10 Family) HD Audio Controller

  - by Dave Roger

  I have no sound on my Debian unstable. # cat /etc/issue Debian GNU/Linux squeeze/sid # lspci |grep -i audio 00:1b.0 Audio device: Intel Corporation 82801JD/DO (ICH10 Family) HD Audio Controller (rev 02) # lsmod | grep -i snd snd_hda_codec_realtek 235506 1 snd_hda_intel 19907 0 snd_hda_codec 54244 2 snd_hda_codec_realtek,snd_hda_intel snd_hwdep 5380 1 snd_hda_codec snd_pcm_oss 32591 0 snd_mixer_oss 12606 1 snd_pcm_oss snd_pcm 60471 3 snd_hda_intel,snd_hda_codec,snd_pcm_oss snd_seq_midi 4400 0 snd_rawmidi 15515 1 snd_seq_midi snd_seq_midi_event 4628 1 snd_seq_midi snd_seq 42881 2 snd_seq_midi,snd_seq_midi_event snd_timer 15582 2 snd_pcm,snd_seq snd_seq_device 4493 3 snd_seq_midi,snd_rawmidi,snd_seq snd 46446 11 snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device soundcore 4598 1 snd snd_page_alloc 6249 2 snd_hda_intel,snd_pcm # cat /proc/asound/version Advanced Linux Sound Architecture Driver Version 1.0.21. # uname -r 2.6.32-5-amd64

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• Fastest way to move files from a guest VM to the host?

  - by iTayb

  Hey there. I'm looking for the fastest way to copy files from a VM to physical servers. Setting up a network between them isn't a thing I'd like to do. I believe it is much more secure when not having one. VMware suggests using the Copy-VMGuestFile cmdlet from their PowerCLI interface, however I find it slow (Running at approximately 1.5MB/s). I thought of the following: Creating a new virtual hard drive, moving the files in, and download the .vmdk file from the server, then extracting it locally. It is possible, however will not work with working VMs, and I don't want to shut-down the VM every time I want to move files. Use the virtual floppy device and download the .flp file. It works even if the VM is running, but it is limited to 2.8MB. Do I have any other way? I'm using ESXi 4.1. Thanks.

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• how do I tether my computer and blackberry?

  - by el chief

  I have Windows 7 Home Premium Blackberry Curve 9300 6.0 bundle 1478 (v6.0.0.380, platform 6.6.0.86) desktop software 6.0.0.380 I was able to connect with desktop software version 5 but 6 does not work. I am able to connect to the internet just fine with the device itself (ie can browse the web). How can I debug this? update: here's the error message: when i try to connect i get the message "failed to start mobile internet. the specified port is not open. please check your profile settings and make sure your radio is turned on. this service might also have been turned off by your wireless service provider or your administrator"

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• Bonjour/DNS Service Discovery queries

  - by senloe

  I'm trying to implement dns service discovery in my application (no, I'm not asking for a programmatic answer). What I believe is one of my big pain points is generating the query. I know I need to send out a multicast broadcast on port 5353 and want to look for devices of type _ipp._tcp and _print._tcp, but I don't know what the question section needs to look like. For example, in SSDP I sent out a query that looks like the following: "M-SEARCH * HTTP/1.1\r\n" "HOST: 239.255.255.250:1900\r\n" + "MAN: \"ssdp:discover\"\r\n" "ST: urn:schemas-upnp-org:device:Printer:1\r\n" "MX: 5000\r\n\r\n" From what I know about a DNS query I need to send something like: "_ipp.tcp,all,all" but I know there needs to be more. Any pointers to documentation, etc would be greatly appreciated! update rfc1035 appears to contain promising information re the message structure.

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• Second partition with Windows 7 unmountable

  - by Florian Pilz

  I'm using GRUB2 to dualboot Ubuntu and Windows 7. I installed Windows 7 some days ago and rewrote GRUB2 to cope with the dualboot. Everything went fine till yesterday - I could boot into both OS. Since this morning my laptop restarts every time I choose Windows 7 from the menu. Ubuntu is still working. As I tried to mount the partition with Windows 7 on Ubuntu it gave me return code 2, so this isn't working as well. I tried to reinstall GRUB2 to the MBR but it didn't help. I also tried to repair Windows 7 boot with it's install DVD, while trying so it showed me the following error: "Status: 0xc000000f Info: Boot selection failed because a required device is inaccessible." Tanks in advance

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• Good HDMI splitter/switch solution

  - by Mehper C. Palavuzlar

  I have a full HD TV which has only 2 HDMI ports on it. Since I have more than 2 devices I connect to TV (e.g. laptop, game console, DVD player), it becomes uncomfortable to plug in and plug out HDMI cables every time I need to use the relevant device. I need a cheap solution to increase the number of my HDMI ports at least to 3. What type of splitter/switch do you recommend? Does the quality of splitter matter, or do they all produce the same audio & video quality?

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• multi boot: xp + xp + xubuntu, how to?

  - by Jassano

  My laptop (with a single harddrive) currently has xp + xubuntu dual boot. I want to make that triple boot: xp + xp + xubuntu Please don't ask why, take it as given. How can I accomplish this triple boot? I tried using gparted to add a partition (worked!), used dd to clone the xp install to the new partition (worked!), edited grub (my bootloader) to list a third entry pointing to the correct device (worked!). But regardless of which of the two xp entries in grub I select I still get booted into one and the same XP. The files for the other XP show up under D: so I know they're there alright. I have edited the boot.ini on the new partition so everything looks to be in order. What do I need to do to change that and make both xp instances bootable in this scenario?

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• Mac OS X - rmdir fails with "Operation not permitted" for a folder created by a PC on a removable dr

  - by maxint

  Hello. I have a problem (using Mac OS X 10.5.8) with the access rights of a folder that was presumably created by a virus on a disk-on-key drive when I used it with a PC. I can't remove the folder or change it's name. In Finder's Info window the Lock box is unchecked and uncheckable - if I try to check it it flips back to off. Please see the details: MaxBookAir:GARMIN'S maxint$ rmdir winamp_cache_0001/ rmdir: winamp_cache_0001/: Operation not permitted MaxBookAir:GARMIN'S maxint$ MaxBookAir:GARMIN'S maxint$ mv winamp_cache_0001 test mv: rename winamp_cache_0001 to test: Operation not permitted MaxBookAir:GARMIN'S maxint$ MaxBookAir:GARMIN'S maxint$ GetFileInfo winamp_cache_0001 directory: "/Volumes/GARMIN'S/winamp_cache_0001" attributes: avbstclinmedz created: 12/23/2009 14:34:52 modified: 02/13/2010 22:52:36 MaxBookAir:GARMIN'S maxint$ MaxBookAir:GARMIN'S maxint$ stat -x winamp_cache_0001 File: "winamp_cache_0001" Size: 32768 FileType: Directory Mode: (0777/drwxrwxrwx) Uid: ( 502/ maxint) Gid: ( 20/ staff) Device: 14,5 Inode: 7439 Links: 1 Access: Wed Dec 23 00:00:00 2009 Modify: Sat Feb 13 22:52:36 2010 Change: Sat Feb 13 22:52:36 2010 MaxBookAir:GARMIN'S maxint$ MaxBookAir:GARMIN'S maxint$ stat -r winamp_cache_0001 234881029 7439 040777 1 502 20 0 32768 1261506600 1266081756 1266081756 1261559092 131072 64 32768 winamp_cache_0001 MaxBookAir:GARMIN'S maxint$ MaxBookAir:GARMIN'S maxint$ ls -lTd winamp_cache_0001/ drwxrwxrwx 1 maxint staff 32768 Feb 13 22:52:36 2010 winamp_cache_0001/ MaxBookAir:GARMIN'S maxint$

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• Setup kickstart boot for all installation media types (cd and usb-flash)

  - by Cucumber

  I created own custom CentOS iso. I used mkisofs make it. This is part of my isolinux.cfg file: label vesa menu label Install ^RAIDIX system kernel vmlinuz append initrd=initrd.img xdriver=vesa nomodeset text linux ks=cdrom:/isolinux/ks.cfg If I specify parameter ks=cdrom:/isolinux/ks.cfg my iso will boot only from cd or dvd-rom. If I specify parameter ks=hd:<device>:/ks.cfg my iso will boot only from usb-drive. Can I specify ks parameter to boot from both type of installation media?

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• Wi-Fi performance in Windows 8 RP on a MacBook Air (mid 2011)

  - by Steven Lu

  I was able to install the Boot Camp Windows software using the executable that it provided, and there are no unrecognized or unknown devices in Device Manager. Wi-Fi works but it seems to be limited to an extremely slow 1.5Mbits. Network Center reports an 802.11n connection (at 65Mbps usually) but transfers never reach above about 200kB/s. Being limited to 1/20th of the connection speed of my internet service is quite frustrating. Does anybody experience the same issue? I have been trying to identify the Broadcom Wi-Fi chipset and a driver that I could try to upgrade to but I have made very little progress on Google on this front.

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