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• Why does a zip file appear larger than the source file especially when it is text?

  - by PeanutsMonkey

  I have a text file that is 19 bytes in size and having compressed the file using zip and 7zip, it appears to be larger. I had a read of the question on Why is a 7zipped file larger than the raw file? as well as Why doesn't ZIP Compression compress anything? but considering the file is not already compressed I would have expected further compression. Attached is a screenshot. EDIT0 I took the example further by creating a file that contained random data as follows dd if=/dev/urandom of=sample.log bs=1G count=1 and attempted to compress the file using both zip and 7zip however there were no compression gains. Why is that?

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• compressing dd backup on the fly

  - by Phil

  Maybe this will sound like dumb question but the way i'm trying to do it doesn't work. I'm on livecd, drive is unmounted, etc. When i do backup this way sudo dd if=/dev/sda2 of=/media/disk/sda2-backup-10august09.ext3 bs=64k ...normally it would work but i don't have enough space on external hd i'm copying to (it ALMOST fits into it). So I wanted to compress this way sudo dd if=/dev/sda2 | gzip > /media/disk/sda2-backup-10august09.gz ...but i got permissions denied. I don't understand.

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• SSH from Windows Vista to Ubuntu (using cwrsync)

  - by user39141

  Newbie questoin but I can't seem to figure it out. Using cwrsync which in turn calls ssh.exe from a Windows Vista box to Ubuntu. For below, user in ubuntu is 'linuxuser' and user on Windows box is 'winuser' - remote box is 'linuxhost' and windows box is 'winhost' Exported keys such that on the remote box /home/linuxuser/.ssh/authorized_keys is correctly populated. Problem is when I launch ssh it tries to write to /home/winuser/.ssh instead of /cygdrive/home/users/winuser/.ssh as below. c:\Program Files (x86)\cwRsync\binssh linuxuser@linuxhost Could not create directory '/home/winuser/.ssh'. The authenticity of host 'linuxhost (192.168.1.105)' can't be establish ed. RSA key fingerprint is 67:10:a9:49:6e:a3:2b:4a:a0:e0:b7:75:76:da:c3:04. Are you sure you want to continue connecting (yes/no)? Host key verification failed.

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• Did bittorrent sync take advantage of multiple peers

  - by NachoChip

  I am currently testing BT sync, and really like it. However, I cannot find much of the technical detail regarding to how it works. I wonder did anyone know that is the program take advantage of multiple peers connection? For example, if I have a File A(FA), which exist in Computer 1 (C1) and Computer 2 (C2). If I set up a sync from C1 and C2 to a folder in Computer 3 (C3), will I get a better sync up time because I can get FA from 2 sources at the same time (of course, assume I have enough downstream)?

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• Data recovery after user profile corruption on Windows XP

  - by m68z8mi

  I'm away from home for college, and my computer back home has been having some issues. My dad took it to a computer store, and apparently the user profiles somehow got corrupted, so they're locked out of the computer. This is a Windows XP box, but I changed the default administrator account password, so that backdoor isn't a possibility. Now, that computer's HDD has a whole bunch of data on it which my dad would hate to lose, so I suggested that they take the HDD out, plug it into some other computer, and just copy all the data off that way (keeping in mind that the data itself wasn't encrypted). However, the computer store people said that wouldn't be possible unless they had the administrator account password (which I can't remember for the life of me), and that they'd either have to reformat and reinstall Windows, or else use some complicated sounding recovery process costing a decent amount of money. That sounds like complete BS to me, but I'm not 100% sure about it, so I thought I'd get some more opinions. Could someone more knowledgeable about this stuff suggest a good course of action to take?

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• ext4 loopback device, Buffer I/O Error on reboot

  - by cvb

  I am trying to mount a loopback device on my ext4 formatted ssd drive. I get these errors when I reboot on Linux kernel 2.6.38.8 Buffer I/O error on device loop1, logical block 0 Here is what I do: dd if=/dev/zero of=/mnt/s/lodev bs=4096 count=250000 mkfs.ext4 /mnt/s/lodev mount -n -o loop,rw /mnt/s/lodev /mnt/test The loopback mount is successful, but on reboot I get errors as mentioned above. Even mouting with 'sync','data=writeback' does not help. I tried to losetup a device, but see the same behavior. I also reformatted the base device and created the loopback device and mounted as above, I still see these errors. I do not see them when I format them as vfat. Appreciate any suggestions on this problem.

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• gitosis public key

  - by mbursill

  On my client I am attempting to run: git clone gitosis@DevServer:gitosis-admin.git I get a warning: The authenticity of host '10.1.1.13 (10.1.1.13)' can't be established. RSA key fingerprint is a2:c3:fd:d7:f7:75:df:dd:49:64:ce:64:cc:98:e6:2c. Are you sure you want to continue connecting (yes/no)? It appears to be picking up the public key from: /etc/ssh/ssh_host_rsa_key.pub I want it to use the key located in: /srv/gitosis/.ssh/authorized_keys How do I get my server to hand out the correct public key?

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• Why using swap file over a SMB/NFS mounted filesystem is not possible in Linux?

  - by Avio

  I'd like to use another machine's unused RAM as swapspace for my primary Linux installation. I was just curious about performance of network ramdisks compared to local (slow) mechanical hard disks. The swapfile is on a tmpfs mountpoint and is shared through samba. However, every time I try to issue: swapon /mnt/ramswap/swapfile I get: swapon: /mnt/ramswap/swapfile: swapon failed: Invalid argument and in dmesg I read: [ 9569.806483] swapon: swapfile has holes I've tried to allocate the swapfile with dd if=/dev/zero of=swapfile bs=1024 (but also =4096 and =1048576) and with truncate -s 2G (both followed by mkswap swapfile) but the result is always the same. In this post (dated back to 2002) someone says that using a swapfile over NFS/SMB is not possible in Linux. Is this statement still valid? And if yes, what is the reason of this choice and is there any workaround to have this working?

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• Improve efficiency when using parallel to read from compressed stream

  - by Yoga

  Is another question extended from the previous one [1] I have a compressed file and stream them to feed into a python program, e.g. bzcat data.bz2 | parallel --no-notice -j16 --pipe python parse.py > result.txt The parse.py can read from stdin continusuoly and print to stdout My ec2 instance is 16 cores but from the top command it is showing 3 to 4 load average only. From the ps, I am seeing a lot of stuffs like.. sh -c 'dd bs=1 count=1 of=/tmp/7D_YxccfY7.chr 2>/dev/null'; I know I can improve using the -a in.txtto improve performance, but with my case I am streaming from bz2 (I cannot exact it since I don't have enought disk space) How to improve the efficiency for my case? [1] Gnu parallel not utilizing all the CPU

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• ionice idle is ignored

  - by Ferran Basora

  I have been testing the ionice command for a while and the idle (3) mode seems to be ignored in most cases. My test is to run both command at the same time: du <big folder> ionice -c 3 du <another big folder> If I check both process in iotop I see no difference in the percentage of io utilization for each process. To provide more information about the CFQ scheduler I'm using a 3.5.0 linux kernel. I started doing this test because I'm experimenting a system lag each time a daily cron job updatedb.mlocate is executed in my Ubuntu 12.10 machine. If you check the /etc/cron.daily/mlocate file you realize that the command is executed like: /usr/bin/ionice -c3 /usr/bin/updatedb.mlocate Also, the funny thing is that whenever my system for some reason starts using swap memory, the updatedb.mlocate io process is been scheduled faster than kswapd0 process, and then my system gets stuck. Some suggestion? References: http://ubuntuforums.org/showthread.php?t=1243951&page=2 https://bugs.launchpad.net/ubuntu/+source/findutils/+bug/332790

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• Recover partition table after DD command

  - by Shreedhar

  I executed the following command from a Ubuntu live cd terminal (dont ask why). dd if=/dev/zero of=/dev/sdb2 bs=512 count=1 Where sdb2 is a NTFS partition (third partition) on a disk. Suffice to say it is now messed up. When I boot into windows 7, it does show me E drive but when I click on it it asks me to format it. I am not ever sure what I did, did I mess up partition table or only the MFT? Is there any way to get the data back PLEASE HELP! this is very important :(

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• Why is my /dev/random so slow when using dd?

  - by Mikey

  I am trying to semi-securely erase a bunch of hard drives. The following is working at 20-50Mb/s dd if=/dev/zero of=/dev/sda But dd if=/dev/random of=/dev/sda seems not to work. Also when I type dd if=/dev/random of=stdout It only gives me a few bytes regardless of what I pass it for bs= and count= Am I using /dev/random wrong? What other info should I look for to move this troubleshooting forward? Is there some other way to do this with a script or something like makeMyLifeEasy | dd if=stdin of=/dev/sda Or something like that...

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• How to avoid loop limitation in a openvz container?

  - by mat.viguier

  On a openVZ containing Deb7 I need to lock the maximum size of a folder, which is used to upload on a php based web server. The directory is synced, so I have to lock the maxsize. MAXSIZE should be upgradable by adding some physical disk later ... I want to use a file as a block device for a file system. So I have done : dd if=/dev/zero of=/disk2/filesystem.dat bs=1M count=100 Then, I made the filesystem on it mkfs.ext4 filesystem.dat Then I tried to mount it : mkdir /opt/filesystem ; mount /disk2/filesystem.dat /opt/filesystem My OpenVZ (it is on a VPS) has no loop module in the kernerl. So I got Could not find any loop device as usual under OpenVz So i think I have to use FUSE, but I really do not know HOW .... Any idea on locking the size of directory under OpenVZ ?

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• Can't use a network CD-ROM

  - by user53814

  Hi, there! I have a computer with Windows XP and I'm trying to use my local network to use the CD-ROM of my notebook with Windows 7. In windows XP computer with VLC I can open the menu of the DVD but after choose the option for the first chapter the movie window shuts down (but the VLC stays open). With BS-Player when trying to start the first chapter it freezes... Is this possible to fix? Thanks in advance!

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• MBA versus MSIS

  - by user794684

  I am considering going back to school for my masters and I've been looking at several avenues I can take. I've been considering either an MBA or an MSIS degree. Overall I know that an MBA is going to give me a solid skill set that can help me become an executive. However they seem to be a dime a dozen these days and the University I can get into is good, but it's not exactly in the top 100 anything. My undergrad MINOR was in Business Information Systems. I'm rusty as hell, considering I haven't touched it, but an MSIS would be more in the direction of my past academic experience and seems to touch both on business management and IT. Question... With an MSIS will I just be a middleman? Will I really be an important person with a real skill set or will I merely be someone who isn't quite cut out to be a manager and who is clueless about the tech side? Is an MSIS degree going to give me a real chance to move up the pay scale quickly or am I better off learning programing, networking through another BS degree? What will give me more upward mobility career wise? An MBA or an MSIS?

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• Is “Application Programming Interface” a bad name?

  - by Taylor Hawkes

  Application programming interface seems like a bad name for what it is. Is there a reason it was named such? I understand that people used to call them Advanced Programming Interfaces and then renamed to Application Programming Interface. Is that why it is poorly named? Why is it not named Application (to) Programmer Interface. I guess I'm just confused of the meaning behind that name? I write more about my confusion around the name here: BREAKING DOWN THE WORD “APPLICATION PROGRAMMING INTERFACE” This is a very confusing word. We mostly understand what the word Interface means, but “Application Programming”, what even is that. Honestly I'm confused. Is that suppose to be two words like “Application”, “Programming” and then the “Interface” is suppose to mean between the two? Like would a “Computer Human Interface” be an interface between a “Computer” and a “Human” (monitor , keyboard, mouse ) or is a “Computer Human” a real thing - perhaps the terminator. So a CHI is our boy Kyle Reese who is the only way we are able to work with the computer human. I think more likely “Application Programming Interface” was simply poorly named and doesn't really make sense. It was originally called an “Advanced Programming Interface” , but perhaps being a bit to ostentatious merged into the now wildly accepted “Application Programming Interface”. So now, not wanting to change an acronym has confused the living heck out everyone.... Any thoughts or clarification would be great, I'm giving a lecture on this topic in a month, so I would prefer not to BS my way through it.

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• Open Source Security packages for Rails

  - by Edwin

  I'm currently creating a complete web application using Rails 3 to familiarize myself with its inner workings and to gain a better appreciation of a working web application's moving parts. (Plus, since I'm still working on my degree, I hope that it will give me a better idea of what's BS in my education requirements and which weaknesses/skills I should focus on.) The example application I'm working on is an ecommerce site, and I've already configured the backend, routes, controllers, and so on. As part of the application, I'd like to integrate a second layer of security on top of the one Rails already provides for user authentication. However, I've been unable to find any on Google, with the exception of OAuth - which, from my understanding, is meant to secure API calls. While I could roll my own secure authentication system, I'm only in my second year of college and recognize that A) I know little about security, and B) there are developers that know much more about security that are working on open-source projects. What are some actively developed open-source security packages or frameworks that can be easily added to Rails? Pros and cons are not necessary, as I can do the research myself. P.S. I'm not sure whether I posted this in the right SE site; please migrate to SO or Security if it is more appropriate there.

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• Oracle Enterprise Manager sessions on the last day of the Oracle Open World

  - by Anand Akela

  Hope you had a very productive Oracle Open World so far . Hopefully, many of you attended the customer appreciation event yesterday night at the Treasures Islands.   We still have many enterprise manager related sessions today on Thursday, last day of Oracle Open World 2012. Download the Oracle Enterprise Manager 12c OpenWorld schedule (PDF) Oracle Enterprise Manager Cloud Control 12c (and Private Cloud) Time Title Location 11:15 AM - 12:15 PM Application Performance Matters: Oracle Real User Experience Insight Palace Hotel - Sea Cliff 11:15 AM - 12:15 PM Advanced Management of JD Edwards EnterpriseOne with Oracle Enterprise Manager InterContinental - Grand Ballroom B 11:15 AM - 12:15 PM Spark on SPARC Servers: Enterprise-Class IaaS with Oracle Enterprise Manager 12c Moscone West - 3018 11:15 AM - 12:15 PM Pinpoint Production Applications’ Performance Bottlenecks by Using JVM Diagnostics Marriott Marquis - Golden Gate C3 11:15 AM - 12:15 PM Bringing Order to the Masses: Scalable Monitoring with Oracle Enterprise Manager 12c Moscone West - 3020 12:45 PM - 1:45 PM Improving the Performance of Oracle E-Business Suite Applications: Tips from a DBA’s Diary Moscone West - 2018 12:45 PM - 1:45 PM Advanced Management of Oracle PeopleSoft with Oracle Enterprise Manager Moscone West - 3009 12:45 PM - 1:45 PM Managing Sun Servers and Oracle Engineered Systems with Oracle Enterprise Manager Moscone West - 2000 12:45 PM - 1:45 PM Strategies for Configuring Oracle Enterprise Manager 12c in a Secure IT Environment Moscone West - 3018 12:45 PM - 1:45 PM Using Oracle Enterprise Manager 12c to Control Operational Costs Moscone South - 308 2:15 PM - 3:15 PM My Oracle Support: The Proactive 24/7 Assistant for Your Oracle Installations Moscone West - 3018 2:15 PM - 3:15 PM Functional and Load Testing Tips and Techniques for Advanced Testers Moscone South - 307 2:15 PM - 3:15 PM Oracle Enterprise Manager Deployment Best Practices Moscone South - 104 Stay Connected: Twitter | Facebook | YouTube | Linkedin | Newsletter

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• Why did Embarcadero make me sign a waiver?

  - by Peter Turner

  Just signed in to the Embarcadero Developer Network and got this: EXPORT CONTROLS ON EMBARCADERO SOFTWARE Your EDN membership and access to Embarcadero Software is subject to your agreement to and compliance with the following terms: -You agree that U.S. export control laws govern your use of the Embarcadero Software. -You are not a citizen, national, or resident of, and are not under control of, the government of Cuba, Iran, Sudan, North Korea, Syria, nor any country to which the United States has embargoed or prohibited export. -You will not provide or export Embarcadero Software, directly or indirectly, to the above mentioned countries nor to citizens, nationals or residents of those countries. -You are not listed on the United States Department of Treasury lists of Specially Designated Nationals, Specially Designated Terrorists, and Specially Designated Narcotic Traffickers, nor are you listed on the United States Department of Commerce Table of Denial Orders. -You will not provide or export the Embarcadero Software, directly or indirectly, to persons on the above mentioned lists. -You will not use the Embarcadero Software for, and will not allow the Embarcadero Software to be used for, any purposes prohibited by United States law, including for the development, design, manufacture or production of nuclear, chemical or biological weapons of mass destruction. I think it's BS, but what craziness is forcing companies like Embarcadero to hold developers to these very high standards? Also, what is "Embarcadero Software"? Does that mean I can't put a benign videogame on a website that may have a runtime that might be downloaded by a Iranian who love scrabble. Or does "Embarcadero Software" refer to anything I develop using Delphi.

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• Encrypting a non-linux partition with LUKS.

  - by linuxn00b

  I have a non-Linux partition I want to encrypt with LUKS. The goal is to be able to store it by itself on a device without Linux and access it from the device when needed with an Ubuntu Live CD. I know LUKS can't encrypt partitions in place, so I created another, unformatted partition of the EXACT same size (using GParted's "Round to MiB" option) and ran this command: sudo cryptsetup luksFormat /dev/xxx Where xxx is the partition's device name. Then I typed in my new passphrase and confirmed it. Oddly, the command exited immediately after, so I guess it doesn't encrypt the entire partition right away? Anyway, then I ran this command: sudo cryptsetup luksOpen /dev/xxx xxx Then I tried copying the contents of the existing partition (call it yyy) to the encrypted one like this: sudo dd if=/dev/yyy of=/dev/mapper/xxx bs=1MB and it ran for a while, but exited with this: dd: writing `/dev/mapper/xxx': No space left on device just before writing the last MB. I take this to mean the contents of yyy was truncated when it was copied to xxx, because I have dd'd it before, and whenever I have dd'd to a partition of the exact same size, I never get that error. (and fdisk reports they are the same size in blocks). After a little Googling I discovered all luksFormat'ted partitions have a custom header followed by the encrypted contents. So it appears I need to create a partition exactly the size of the old one + however many bytes a LUKS header is. What size should the destination partition be, no. 1, and no. 2, am I even on the right track here? UPDATE I found this in the LUKS FAQ: I think this is overly complicated. Is there an alternative? Yes, you can use plain dm-crypt. It does not allow multiple passphrases, but on the plus side, it has zero on disk description and if you overwrite some part of a plain dm-crypt partition, exactly the overwritten parts are lost (rounded up to sector borders). So perhaps I shouldn't be using LUKS at all?

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• Oracle Tuxedo at Oracle Open World 2012

  - by Deepak Goel

  Oracle Open World is almost here. There is quite a bit of Tuxedo to talk about at this year’s OOW. Primary focus will be on Tuxedo 12c, which was announced in August 2012 and is now generally available. Tuxedo 12c is a major release which many-many new and exciting features in almost all components of Tuxedo. You will not only hear about these features in various conference  sessions, you will also have an opportunity to see these features in action at demo grounds or play with these yourselves in hands-on-labs. Following is listing of Tuxedo related activities at OOW 2012: Conference Sessions Mon 1 Oct, 2012 10:45 AM - 11:45 AM, Oracle Tuxedo: What’s New in 12 c, Strategy, and Roadmap, Moscone South - 309 4:45 PM - 5:45 PM, Simplify Operations, Administration, and Management of Oracle Tuxedo Applications, Marriott Marquis - Golden Gate C3 Wed 3 Oct, 2012 3:30 PM - 4:30 PM, The Art and Practice of Mainframe Migration and Modernization, Moscone South - 309 Thu 4 Oct, 2012  2:15 PM - 3:15 PM, High-Performance, Scalable Enterprise Messaging for C/C++/COBOL Applications, Marriott Marquis - Salon 7 HOL (Hands-on Lab) Tues 2 Oct, 2012 5:00 PM - 6:00 PM Deploy, Manage, and Monitor Oracle Tuxedo Applications in the Enterprise Cloud, Marriott Marquis - Salon 3/4 Wed 3 Oct, 2012 1:15 PM - 2:15 PM, Develop C/C++ Applications for the Cloud with Oracle Tuxedo and Oracle Solaris Studio, Marriott Marquis - Salon 5/6 BOF (Birds-of-a-Feather) Mon 1 Oct, 2012 6:15 PM - 7:00 PM, Develop Scalable, Highly Available Enterprise Services in Java with Oracle Tuxedo, Marriott Marquis - Golden Gate C1 Demos Oracle Tuxedo: #1 Enterprise Cloud Platform for C/C++/COBOL Apps,  Moscone South, Right - S-215 Mainframe Rehost with Oracle Tuxedo Runtimes for CICS, IMS, and Batch, Moscone South, Right - S-216 Tuxedo Customer Appreciation Dinner Monday 1 Oct, 2012 7:30 PM - Please contact your Oracle Account Representative to attend. Limited seating. Deepak Goel Sr. Director, Software Development Oracle

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• Wired Network not working on Ubuntu 11.10 + Strange Behavior with Manual Conf

  - by Mauricio Cruz

  I'm new to Ubuntu - to be honest this is my very first day trying it... and I've already spent hours trying to make my wired connection work. I've been using this wired network with Windows and OSX, and in both systems I also had some trouble trying to connect in the past (and the troubleshooters did their magic and helped me get connected). Today, this is what I got: I'm running Ubuntu 11.10; ifconfig: eth0 Link encap:Ethernet HWaddr 78:2b:cb:c3:bf:8f UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:1 errors:0 dropped:0 overruns:0 frame:0 TX packets:343 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:70 (70.0 B) TX bytes:63273 (63.2 KB) Interrupt:20 Memory:e2e00000-e2e20000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:1859 errors:0 dropped:0 overruns:0 frame:0 TX packets:1859 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:149368 (149.3 KB) TX bytes:149368 (149.3 KB) wlan0 Link encap:Ethernet HWaddr 10:0b:a9:82:55:c0 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:15484 errors:0 dropped:0 overruns:0 frame:0 TX packets:16871 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:12048377 (12.0 MB) TX bytes:2677679 (2.6 MB) I also have some information from Windows ipconfig /all that I ran at my friend's machine Ipv6 Address: <address> preferential Ipv4 Address: 172.26.65.23 <preferential> Netmask: 255.255.254.0 Default Gateway: 172.26.64.1 DHCP Server : <address> DNS Servers : <address> DNS Suffix : <suffix> The weird thing is that I've tried to configure everything manually, using "Network Connections". When I add everything inside IPv4 Settings, the connection is finally successful, but only for 4~5 seconds before getting disconnected again... Update:I just changed the Connection Method to "Local-Link Only", and the same described above happens: At first, it says "Connection Stablished", but after a few seconds, the wired network gets disconnected. I hope someone can help me get connected! Thanks!

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• B.S.in Computer Science, weak eyes => career change

  - by Prometheus

  So I am going to earn B.S. in Computer Science soon. I like computers. I like programming. The problem is that my eyes are very weak. Depending on their condition, I can only put in about 6 hours in front of computer a day. If I push myself, I have trouble even keeping my eyes open because of soreness/pain, consequently headaches. My eyes do not have medical conditions. I was just born with weak eyes. I tried many different approaches to work around this problem - better monitor, breaks every 10 minutes, supplements... I even memorized a lot of shortcuts to reduce my time on computers! But I am finally giving up. I do not think I can be a programmer for the rest of my life. I was the top of my class in high school because all works were paper-based, I did average in college due to the nature of my eyes and the difficulty of the material. So what do you recommend I do? Or, Is there a career that is similar to programming but requires interacting with computers less?

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• Very slow write access to SSD disks on some Asus P8Z77 motherboards

  - by lenik

  I have Asus P8Z77-V LK motherboard, that ran Mint 13 (based on Ubuntu 12.04) just perfectly, but recently I've tried to install Mint 17 and noticed abysmal write performance. Write speed on SSD disk was about 1.5MB/sec, when it's supposed to be in 150-250MB/sec range. For write testing I've used dd if=/dev/zero of=/dev/sda bs=10M count=10 while booted up from LiveCD. I have also tested the read speed with hdparm -tT /dev/sda and got about 440MB/sec -- that's normal. I can tell, the read performance has not degraded at all and is not an issue here. Since I had a few different SSD disks and few motherboards, I've tested and tested and here are results: Asus P8H77 works fine with Mint13, has very slow write speed starting from Mint14. Asus P8Z77-V LK works with Mint13, has very slow write speed starting from Mint14. Asus P8Z77-V PRO works with Mint13, and works just fine with Mint14, 15, 16 and 17. The only difference between "PRO" version and others is that it has extra SATA controller onboard (in addition to the Z77 chipset SATA controller) providing extra 2 SATA ports. SSD disks work fine with "PRO" version when connected to the native SATA ports as well as to the ports provided by extra SATA controller, so this does not look like a hardware issue. As far as I can tell, there's something changed in the kernel while going from 3.2 to 3.5, that affects the detection of onboard SATA controller for Asus P8*77 motherboards, that screws up the write speed for SSD drives. Could anyone shed some light on how to fix this issue or, possibly, give a pointer to a more suitable place to ask this question?

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• Can't ssh to instance

  - by megas

  I have a linode instance, I was successfully connecting to it via ssh. But I've decided to rebuild my instance and then I can not connect to that instance via ssh. The linode works correctly because I can get access via Lish (lonode ssh) I've tried to clear known_hosts with: ssh-keygen -R 212.71.xxx.xx But I still getting message: ssh [email protected] -v OpenSSH_5.9p1 Debian-5ubuntu1.1, OpenSSL 1.0.1 14 Mar 2012 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug1: Connecting to 212.71.238.74 [212.71.238.74] port 22. debug1: Connection established. debug1: identity file /home/megas/.ssh/id_rsa type 1 debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048 debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048 debug1: identity file /home/megas/.ssh/id_rsa-cert type -1 debug1: identity file /home/megas/.ssh/id_dsa type -1 debug1: identity file /home/megas/.ssh/id_dsa-cert type -1 debug1: identity file /home/megas/.ssh/id_ecdsa type -1 debug1: identity file /home/megas/.ssh/id_ecdsa-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1.1 debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1.1 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1.1 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: sending SSH2_MSG_KEX_ECDH_INIT debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug1: Server host key: ECDSA c5:c3:a7:c0:5a:25:a1:64:c4:04:0c:42:bb:46:f6:96 debug1: Host '212.71.238.74' is known and matches the ECDSA host key. debug1: Found key in /home/megas/.ssh/known_hosts:1 debug1: ssh_ecdsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Offering RSA public key: /home/megas/.ssh/id_rsa debug1: Authentications that can continue: publickey,password debug1: Trying private key: /home/megas/.ssh/id_dsa debug1: Trying private key: /home/megas/.ssh/id_ecdsa debug1: No more authentication methods to try. Permission denied (publickey,password). How to resolve this problem? Thanks

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