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  • Disable USB powered light from command line?

    - by Jeff Welling
    I have a nice little USB light which has no off switch, it is 'on' for the duration of being plugged in. My question is, is there a way of disabling the USB port so as to turn off the light while it is still plugged in? Preferably, this could be done from the command line, but if it's possible at all that would be really cool regardless. I use Mac and Linux, but am interested to learn if this is possible in any OS, or if physical hardware prevents usage like this.

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  • Operative systems on SD cards

    - by HisDudeness
    I was getting some wild ideas the last days, like putting some operative systems into SD cards rather than on my hard drive. I'll go further into details now and explain what lead me to consider this probably abominable decision. I am on a laptop (that means I have a native SD-card reader) which is currently running a cross-distro setup, with a bunch of Linux systems (placed in dedicated ext4 logical partitions into a huge extended one) regulated by an unique GRUB. Since today, my laptop haven't even seen any Windows system with binoculars. I was thinking about placing all the os part of my setup into a Secure Digital to save all my 500 Gb Hard Drive for documents, music, videos and so on, and being able to just remove the SD and boot my system into another computer too, as well as having the possibility of booting other systems into mine by just plugging in another SD, without having to keep it constantly placed in my PC. Also, in the remote case in the near future I just wanted to boot Windows 8 in it, I read it causes major boot incompatibility issues with other systems by needing a digital signature in order for them to start. By having it in a removable drive, I could just get rid of it when I'm needing him and switch its card with Linux one, and so not having any obstacles to their boot. Now, my questions are: I know unlikely traditional rotating disk drives, integrated circuits ones have a limited lifespan in terms of cluster rewriting. Is it an obstacle to that kind of usage? I mean, some Ultrabooks are using SSD now, is it the same issue, or there are some differences between Solid State Drives and Secure Digitals in that sense? Maybe having them to store system files which are in fixed positions (making the even-usage of cluster technology useless) constantly being re-read and updated and similar things just gets them soon unserviceable, do it? Second question: are all motherboards and BIOSes able to boot from SDs just like they are from USB pen drives (I mean, provided card reader is USB-connected, isn't it)? Or can't bootloaders like GRUB be installed on SDs working? If they can't, is it a solution installing GRUB to MBR and making boot option pointing to SD? Will it work? Are there any other problems to installing OSs on a Secure Digital?

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  • apache log analysis tools for multiple virtual hosts?

    - by shreddd
    I am interested in trying to get a side by side usage comparison of all the virtual hosts being served up by my apache server. In the simplest case, I want to see a list (or bar chart) with each virtual host and the number of requests/traffic on that site. I've been playing around with webalyzer and awstats but I haven't been able to compare multiple virtual hosts in the same infographic. Anyone have any suggestions on tools for doing this (or how I might use the above tools to do so)?

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  • e2fsck extremely slow, although enough memory exists

    - by kaefert
    I've got this external USB-Disk: kaefert@blechmobil:~$ lsusb -s 2:3 Bus 002 Device 003: ID 0bc2:3320 Seagate RSS LLC As can be seen in this dmesg output, there is some problem that prevents that disk from beeing mounted: kaefert@blechmobil:~$ dmesg ... [ 113.084079] usb 2-1: new high-speed USB device number 3 using ehci_hcd [ 113.217783] usb 2-1: New USB device found, idVendor=0bc2, idProduct=3320 [ 113.217787] usb 2-1: New USB device strings: Mfr=2, Product=3, SerialNumber=1 [ 113.217790] usb 2-1: Product: Expansion Desk [ 113.217792] usb 2-1: Manufacturer: Seagate [ 113.217794] usb 2-1: SerialNumber: NA4J4N6K [ 113.435404] usbcore: registered new interface driver uas [ 113.455315] Initializing USB Mass Storage driver... [ 113.468051] scsi5 : usb-storage 2-1:1.0 [ 113.468180] usbcore: registered new interface driver usb-storage [ 113.468182] USB Mass Storage support registered. [ 114.473105] scsi 5:0:0:0: Direct-Access Seagate Expansion Desk 070B PQ: 0 ANSI: 6 [ 114.474342] sd 5:0:0:0: [sdb] 732566645 4096-byte logical blocks: (3.00 TB/2.72 TiB) [ 114.475089] sd 5:0:0:0: [sdb] Write Protect is off [ 114.475092] sd 5:0:0:0: [sdb] Mode Sense: 43 00 00 00 [ 114.475959] sd 5:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 114.477093] sd 5:0:0:0: [sdb] 732566645 4096-byte logical blocks: (3.00 TB/2.72 TiB) [ 114.501649] sdb: sdb1 [ 114.502717] sd 5:0:0:0: [sdb] 732566645 4096-byte logical blocks: (3.00 TB/2.72 TiB) [ 114.504354] sd 5:0:0:0: [sdb] Attached SCSI disk [ 116.804408] EXT4-fs (sdb1): ext4_check_descriptors: Checksum for group 3976 failed (47397!=61519) [ 116.804413] EXT4-fs (sdb1): group descriptors corrupted! ... So I went and fired up my favorite partition manager - gparted, and told it to verify and repair the partition sdb1. This made gparted call e2fsck (version 1.42.4 (12-Jun-2012)) e2fsck -f -y -v /dev/sdb1 Although gparted called e2fsck with the "-v" option, sadly it doesn't show me the output of my e2fsck process (bugreport https://bugzilla.gnome.org/show_bug.cgi?id=467925 ) I started this whole thing on Sunday (2012-11-04_2200) evening, so about 48 hours ago, this is what htop says about it now (2012-11-06-1900): PID USER PRI NI VIRT RES SHR S CPU% MEM% TIME+ Command 3704 root 39 19 1560M 1166M 768 R 98.0 19.5 42h56:43 e2fsck -f -y -v /dev/sdb1 Now I found a few posts on the internet that discuss e2fsck running slow, for example: http://gparted-forum.surf4.info/viewtopic.php?id=13613 where they write that its a good idea to see if the disk is just that slow because maybe its damaged, and I think these outputs tell me that this is not the case in my case: kaefert@blechmobil:~$ sudo hdparm -tT /dev/sdb /dev/sdb: Timing cached reads: 3562 MB in 2.00 seconds = 1783.29 MB/sec Timing buffered disk reads: 82 MB in 3.01 seconds = 27.26 MB/sec kaefert@blechmobil:~$ sudo hdparm /dev/sdb /dev/sdb: multcount = 0 (off) readonly = 0 (off) readahead = 256 (on) geometry = 364801/255/63, sectors = 5860533160, start = 0 However, although I can read quickly from that disk, this disk speed doesn't seem to be used by e2fsck, considering tools like gkrellm or iotop or this: kaefert@blechmobil:~$ iostat -x Linux 3.2.0-2-amd64 (blechmobil) 2012-11-06 _x86_64_ (2 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 14,24 47,81 14,63 0,95 0,00 22,37 Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util sda 0,59 8,29 2,42 5,14 43,17 160,17 53,75 0,30 39,80 8,72 54,42 3,95 2,99 sdb 137,54 5,48 9,23 0,20 587,07 22,73 129,35 0,07 7,70 7,51 16,18 2,17 2,04 Now I researched a little bit on how to find out what e2fsck is doing with all that processor time, and I found the tool strace, which gives me this: kaefert@blechmobil:~$ sudo strace -p3704 lseek(4, 41026998272, SEEK_SET) = 41026998272 write(4, "\212\354K[_\361\3nl\212\245\352\255jR\303\354\312Yv\334p\253r\217\265\3567\325\257\3766"..., 4096) = 4096 lseek(4, 48404766720, SEEK_SET) = 48404766720 read(4, "\7t\260\366\346\337\304\210\33\267j\35\377'\31f\372\252\ffU\317.y\211\360\36\240c\30`\34"..., 4096) = 4096 lseek(4, 41027002368, SEEK_SET) = 41027002368 write(4, "\232]7Ws\321\352\t\1@[+5\263\334\276{\343zZx\352\21\316`1\271[\202\350R`"..., 4096) = 4096 lseek(4, 48404770816, SEEK_SET) = 48404770816 read(4, "\17\362r\230\327\25\346//\210H\v\311\3237\323K\304\306\361a\223\311\324\272?\213\tq \370\24"..., 4096) = 4096 lseek(4, 41027006464, SEEK_SET) = 41027006464 write(4, "\367yy>x\216?=\324Z\305\351\376&\25\244\210\271\22\306}\276\237\370(\214\205G\262\360\257#"..., 4096) = 4096 lseek(4, 48404774912, SEEK_SET) = 48404774912 read(4, "\365\25\0\21|T\0\21}3t_\272\373\222k\r\177\303\1\201\261\221$\261B\232\3142\21U\316"..., 4096) = 4096 ^CProcess 3704 detached around 16 of these lines every second, so 4 read and 4 write operations every second, which I don't consider to be a lot.. And finally, my question: Will this process ever finish? If those numbers from fseek (48404774912) represent bytes, that would be something like 45 gigabytes, with this beeing a 3 terrabyte disk, which would give me 134 days to go, if the speed stays constant, and e2fsck scans the disk like this completly and only once. Do you have some advice for me? I have most of the data on that disk elsewhere, but I've put a lot of hours into sorting and merging it to this disk, so I would prefer to getting this disk up and running again, without formatting it anew. I don't think that the hardware is damaged since the disk is only a few months and since I can't see any I/O errors in the dmesg output. UPDATE: I just looked at the strace output again (2012-11-06_2300), now it looks like this: lseek(4, 1419860611072, SEEK_SET) = 1419860611072 read(4, "3#\f\2447\335\0\22A\355\374\276j\204'\207|\217V|\23\245[\7VP\251\242\276\207\317:"..., 4096) = 4096 lseek(4, 43018145792, SEEK_SET) = 43018145792 write(4, "]\206\231\342Y\204-2I\362\242\344\6R\205\361\324\177\265\317C\334V\324\260\334\275t=\10F."..., 4096) = 4096 lseek(4, 1419860615168, SEEK_SET) = 1419860615168 read(4, "\262\305\314Y\367\37x\326\245\226\226\320N\333$s\34\204\311\222\7\315\236\336\300TK\337\264\236\211n"..., 4096) = 4096 lseek(4, 43018149888, SEEK_SET) = 43018149888 write(4, "\271\224m\311\224\25!I\376\16;\377\0\223H\25Yd\201Y\342\r\203\271\24eG<\202{\373V"..., 4096) = 4096 lseek(4, 1419860619264, SEEK_SET) = 1419860619264 read(4, ";d\360\177\n\346\253\210\222|\250\352T\335M\33\260\320\261\7g\222P\344H?t\240\20\2548\310"..., 4096) = 4096 lseek(4, 43018153984, SEEK_SET) = 43018153984 write(4, "\360\252j\317\310\251G\227\335{\214`\341\267\31Y\202\360\v\374\307oq\3063\217Z\223\313\36D\211"..., 4096) = 4096 So the numbers in the lseek lines before the reads, like 1419860619264 are already a lot bigger, standing for 1.29 terabytes if those numbers are bytes, so it doesn't seem to be a linear progress on a big scale, maybe there are only some areas that need work, that have big gaps in between them. UPDATE2: Okey, big disappointment, the numbers are back to very small again (2012-11-07_0720) lseek(4, 52174548992, SEEK_SET) = 52174548992 read(4, "\374\312\22\\\325\215\213\23\0357U\222\246\370v^f(\312|f\212\362\343\375\373\342\4\204mU6"..., 4096) = 4096 lseek(4, 46603526144, SEEK_SET) = 46603526144 write(4, "\370\261\223\227\23?\4\4\217\264\320_Am\246CQ\313^\203U\253\274\204\277\2564n\227\177\267\343"..., 4096) = 4096 so either e2fsck goes over the data multiple times, or it just hops back and forth multiple times. Or my assumption that those numbers are bytes is wrong. UPDATE3: Since it's mentioned here http://forums.fedoraforum.org/showthread.php?t=282125&page=2 that you can testisk while e2fsck is running, i tried that, though not with a lot of success. When asking testdisk to display the data of my partition, this is what I get: TestDisk 6.13, Data Recovery Utility, November 2011 Christophe GRENIER <[email protected]> http://www.cgsecurity.org 1 P Linux 0 4 5 45600 40 8 732566272 Can't open filesystem. Filesystem seems damaged. And this is what strace currently gives me (2012-11-07_1030) lseek(4, 212460343296, SEEK_SET) = 212460343296 read(4, "\315Mb\265v\377Gn \24\f\205EHh\2349~\330\273\203\3375\206\10\r3=W\210\372\352"..., 4096) = 4096 lseek(4, 47347830784, SEEK_SET) = 47347830784 write(4, "]\204\223\300I\357\4\26\33+\243\312G\230\250\371*m2U\t_\215\265J \252\342Pm\360D"..., 4096) = 4096 (times are in CET)

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  • SSH tunneling hangs with many connections

    - by middleofdreams
    I am forced to use SSH tunneling to access many servers (over 100) via one gateway server. To keep connection alive I am using autossh. Everything works pretty well until there is high traffic (people are connecting to most of the servers at once). then ssh process reaches 12% of cpu (which is configured maximum for separate process) and no connection is working anymore - i have to restart autossh script. What could be the possible reason for that?

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  • what is slowing my application?

    - by sam
    Hi, I am generating a report as a web page 3MB, I am a newbie, I am not sure why it is slow: the size is big the upload internet is slow the server is slow the browser is taking long time to process the cleint code (Jquery, javascript) please ask me questions, so I can explain more,??? I have a quad CPU, 4G Ram with two web application running, the (Down/up) is 8Mb/3Mb as ISP says, speedtest.net shows only: Ping 41ms, Download 4Mb, up: 0.16Mb thanks

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  • Does more RAM on Mac really improve performance?

    - by Moshe
    I'm coming from a PC, loaded with a Core 2 Quad CPU and 8GB of DDR2 RAM. I was running Premiere CS3. I'm new to Mac so I'm not sure if this will help performance: Will increasing my 21.5" Core 2 Duo iMac's memory from 4GB (DDR3) to 8GB improve performance of Premiere CS4 significantly? I am not impressed with Premiere as it is now. The iMac is the newest one as of this post.

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  • Windows 7 - Virtual PC or Workstation 7.1 - Not working 4 me

    - by George
    I have a Windows 7 Ultimate - 64 bit Operating System When I'm trying to create virtual machine Windows Server 2008 64 bit I'm getting the same error neither with Virtual PC or Workstation 7.1 Error: 64 bit guest operating systems are not supported by this host and will not run and Status: 0xc000035a info: Attempting to load a 64 bit application however this CPU is not compatible with 64 bit mode. Is it any settings I'm missing or can you give me a suggestion about workaround, or what do I need to make it work.

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  • Does Windows 7 Home Premium support Dual Core Processors?

    - by nicon
    I'm looking to buy a new laptop (the new studio 14 from Dell). The processor for this laptop is an Intel Core i5-520M. Think link http://reviews.cnet.com/8301-31012_7-10379487-10355804.html says that it supports only 1 CPU. Also Dell recommend the Professionnal version even tough Home Premium is the default choice. So I'm a little confuse as does Windows 7 Home Premium support Dual Core Processors ?

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  • Drupal on an NFS share has terrible performance

    - by Marcus
    We have a setup where a Drupal 7 site with the following setup - a VMware ESXi 4.1 host server running a web vm and an NFS VM. The web VM is using Apache and mod_php. The site is still in development thus we have to turn off all forms of caching due to the frequently-updated files. Each page request takes around 15-20 seconds to complete. Profiling the PHP code shows that the vast majority of time (normally over 90%) is taking by all the is_dir(), is_file() function calls that load up the modules. I've increased PHP's realpath cache size to several megs and an strace shows that the lstat calls then drop from over 200 to around 6 and stat() decreases a bit (around 600 calls). However, while this has shaved off quite a bit of time, I am simply unable to break past the 10 second per request barrier. Is there a way to get better performance out of this setup that doesn't involve caching? Configs and stats: VMs: web - Centos 6 64bt, 2.5GB RAM, normal CPU/HD prioritisation nfs - Centos 6 64bt, 2GB RAM, normal CPU priority, high HD priority PHP: 32M realpath cache size (it's this high for testing purposes) NFS: ~]# egrep -v '#|^$' /etc/nfsmount.conf [ NFSMount_Global_Options ] Defaultvers=4 Ac=False Rsize=32k Wsize=32k Bsize=32k Reading speeds via NFS are not an issue a dd of a 100M test file using 32k blocks returns: 3200+0 records in 3200+0 records out 104857600 bytes (105 MB) copied, 1.84984 s, 56.7 MB/s real 0m1.857s user 0m0.007s sys 0m0.330s Strace on Apache process with empty realpath cache: % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 50.78 1.157452 337 3434 28 stat 32.58 0.742656 628 1182 425 open 9.29 0.211788 762 278 1 lstat 3.17 0.072322 0 237865 write 2.45 0.055839 490 114 13 access 0.45 0.010262 43 237 brk 0.34 0.007725 10 811 74 read 0.28 0.006340 9 679 fstat 0.22 0.005069 18 281 poll 0.20 0.004533 6 698 getdents 0.09 0.001960 10 190 mmap 0.05 0.001065 14 74 accept4 0.04 0.001000 333 3 chdir 0.03 0.000750 4 190 munmap 0.01 0.000339 0 836 close 0.01 0.000247 3 75 writev 0.00 0.000068 0 611 fcntl 0.00 0.000063 1 77 shutdown 0.00 0.000000 0 1 lseek 0.00 0.000000 0 5 rt_sigaction 0.00 0.000000 0 1 rt_sigprocmask 0.00 0.000000 0 3 setitimer 0.00 0.000000 0 5 socket 0.00 0.000000 0 5 5 connect 0.00 0.000000 0 74 getsockname 0.00 0.000000 0 15 setsockopt 0.00 0.000000 0 5 getcwd 0.00 0.000000 0 1 futex ------ ----------- ----------- --------- --------- ---------------- Strace after realpaths are cached % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 60.14 1.371006 484 2831 28 stat 31.79 0.724705 627 1155 425 open 3.53 0.080354 0 237865 write 2.65 0.060433 530 114 13 access 0.43 0.009913 99 100 brk 0.38 0.008730 11 804 74 read 0.35 0.007910 12 675 fstat 0.30 0.006775 10 654 getdents 0.13 0.003065 11 281 poll 0.09 0.002000 333 6 1 lstat 0.07 0.001545 2 807 close 0.05 0.001063 14 74 accept4 0.04 0.001000 6 179 mmap 0.02 0.000404 2 179 munmap 0.01 0.000271 4 75 writev 0.01 0.000212 0 611 fcntl 0.01 0.000129 2 77 shutdown 0.00 0.000022 0 74 getsockname 0.00 0.000000 0 1 lseek 0.00 0.000000 0 5 rt_sigaction 0.00 0.000000 0 1 rt_sigprocmask 0.00 0.000000 0 3 setitimer 0.00 0.000000 0 3 socket 0.00 0.000000 0 3 3 connect 0.00 0.000000 0 15 setsockopt 0.00 0.000000 0 5 getcwd 0.00 0.000000 0 3 chdir ------ ----------- ----------- --------- --------- ---------------- Mount: nfs.xxx.xxx.xxx:/path/to/website/files on /path/to/website/files type nfs (rw,hard,intr,noac,vers=4,addr=xx.xx.xx.xx,clientaddr=xx.xx.xx.xx) Any help is, naturally, appreciated.

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  • How to attach files to an email in Windows Phone 7.5 Mango

    - by Vaibhav Garg
    In the default email client in Windows Phone 7.5 Mango, how can arbitrary files(.zip, .mp3, .txt, .pdf etc) be attached. As the storage is sand-boxed, the file handler can implement hooks to the email client, as MS-Office does and Adobe Reader doesn't, but the email client can not access files in the Phone's storage. Is there a way, or a work around? I my usage pattern, I tend to send a lot of pdfs, and am unable to do that!

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  • VMWare Pre-Allocated vs. Growable, which is faster?

    - by tekiegreg
    In an effort to increase speed in my Vmware setup, I was thinking about converting a Windows XP Guest 32 bit I have from growable to pre-allocated, I'm currently running VMWare Workstation 7 with Windows 7 64 bit as the host. Specs: Dual Core CPU, one allocated to guest 4GB of RAM, 2GB to guest HD max capacity is 500GB, 150GB allocated to guest (I have 300GB left and don't mind parting with the space, currently HD is 80GB and converting would obviously add another 70GB of space), HD that guest is running on is separate from Host OS Either that or any other suggestions you have might be appreciated, thanks!

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  • Is U.P.S necessary to have for PC?

    - by Jitendra vyas
    otherwise can my PC component ( Monitor, Motherboard, RAM, HDD, CPU, SMPS) get damage dues to suddenly power gone and come and due to power fluctuation. or it's only needed to shut down windows Properly. Can i face both Hardware and Software problems without UPS?

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  • How long will it take to create an OS backup image?

    - by user23950
    How much time will it take to backup 49GB? Here are the details: Windows 7 Dual core CPU 2.50 GHz 2GB memory I'll use the free version of Macrium Reflect. I will back it up to a Seagate portable hard-drive. I have installed: Microsoft Visual Studio 2008, NetBeans, and some CS4 Master Collection products. I only need to backup one partition.

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  • Thinkpad Edge e320 thermal sensors description

    - by koressak
    I have a quite specific question concerning description of thermal sensors of my notebbok Thinkpad Edge E320. I have a debian linux installed with lm_sensors package and running command sensors show eight different values without any description of course (temp1 through temp6). I would like to know which one is which (cpu, gpu, hdd, etc.) Using google I didn't find any specific material concerning this exact model. Coult someone point me in the right direction? Thank you in advance.

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  • MS Publisher 2003 - hangs when saving to desktop

    - by Chris
    We have a win 7 home prem pc, amd cpu, 8G ram, plenty of free disk space. Whenever user is working in publisher 20003, and tries to save a publisher 2003 document to the desktop, the save as dialog hangs and takes 2-3 minutes to display the desktop save location. I've tested excel 2003, it has no problems immediately displaying the desktop save as location and saving the file.

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  • installation of mac 10.6.2

    - by mahesh
    hi i installed vmware workstation 7.0 in windows,and it working well.i installed mac os 10.4.8 in it as a guest it is alo working well,but while installin mac os 10.6.2 it dont installed and shows an error as "invalid front-side bus freqency 66000000 hz. disablin the cpu." please help me how to solve this and please suggest any link to easyly understand installation if mac os 10.6.2

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  • Problems creating service using sc.exe

    - by Shoko
    I have this command to create a service: sc create svnserve binpath="\"C:\Program Files (x86)\Subversion\bin\svnserve.exe\" --service --root C:\SVNRoot" displayname="Subversion" depend=tcpip start=auto obj="NT AUTHORITY\LocalService" Unfortunately, it seems not to work, even though the syntax is correct. When I run it, I get the usage instructions (which I guess is a way of telling me that I've supplied incorrect arguments, although I have no idea what incorrect argument I might have supplied). Can anyone help me out of my difficulty? Thanks!

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  • What desktop boards support VT-D or IOMMU?

    - by Jeff Shattock
    I'm looking for a desktop board that supports either VT-D (Intel) or IOMMU (AMD) technology. This is the IO virtualization technology, not VT-x for CPU virtualization. I've found a list of chipsets that are purported to have this, but every board I look at, the vendor has decided to not support that feature. I would really prefer a desktop board over a server board for this. Does anyone have a specific model that is known to support this technology?

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  • Deleting Temporary Internet Files through Group Policy

    - by Kami
    I have a domain controller running on Windows 2008 Server R2 and users login to application servers on which Windows 2003 Server SP2 is installed. I have applied a Group Policy to clean temporary internet files on exit i.e to delete all temporary internet files when users close the browser. But the group policy doesn't seem to work as user profile size keeps on increasing and the major space is occupied by temporary internet files therefore increasing the disk usage. How can i enforce automatic deletion of temporary internet files?

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