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  • Is there a compression method for compressing a group of very similar files, without archiving them?

    - by awiebe
    I want to compress a large nuber of files that have near identical headers, and also some data, however I do not wish to archive them, nor do I wish to zip them individually(because the copression ratio would be much higher if substitutions of similar blocks could be done using a single table). Does a compression method exist to do this already, or should I implement it myself. Note: Don't say "Disk space is cheap", because I may want to use this on an embedded system.

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  • What is the best way to archive (spider) a site that is going to be removed?

    - by Guy
    Three different blogs that I read have recently announced that they are going to be discontinued and removed from the web. Although the archived pages will probably be in Google's cache for a few weeks after they've gone and some of the pages will be in the Way Back Machine I'd like to archive those sites to my hard disk for future reference. What is the best way to do this? Is there any software that transforms a blog (e.g. Blogspot) into a chronological PDF?

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  • Trouble in Nginx hotlink protection

    - by Ayaz Malik
    I am trying to implement image hotlink protection problem in nginx and I need help. I have a huge issue of my site's images being submitted to social networks like StumbleUpon with a direct link like http://example.com/xxxxx.jpg Which sometimes gets huge traffic and increases CPU usage and bandwidth usage. I want to block direct access to my images from other referrers and protect them from being hotlinked. Here is the code from my vhost.conf server { access_log off; error_log logs/vhost-error_log warn; listen 80; server_name mydomain.com www.mydomain.com; # uncomment location below to make nginx serve static files instead of Apache # NOTE this will cause issues with bandwidth accounting as files wont be logged location ~* \.(gif|jpg|jpeg|png|wmv|avi|mpg|mpeg|mp4|htm|html|js|css)$ { root /home/username/public_html; expires 1d; } root /home/mydomain/public_html; } location / { client_max_body_size 10m; client_body_buffer_size 128k; proxy_send_timeout 90; proxy_read_timeout 90; proxy_buffer_size 4k; # you can increase proxy_buffers here to suppress "an upstream response # is buffered to a temporary file" warning proxy_buffers 16 32k; proxy_busy_buffers_size 64k; proxy_temp_file_write_size 64k; proxy_connect_timeout 30s; proxy_redirect http://www.mydomain.com:81 http://www.mydomain.com; proxy_redirect http://mydomain.com:81 http://mydomain.com; proxy_pass http://ip_address/; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; expires 24h; } } For hotlink protection I added this code location ~* (\.jpg|\.png|\.gif|\.jpeg)$ { valid_referers blocked www.mydomain.com mydomain.com; if ($invalid_referer) { return 403; } This is the current nginx code for this domain, but it didn't work: server { access_log off; error_log logs/vhost-error_log warn; listen 80; server_name mydomain.com www.mydomain.com; # uncomment location below to make nginx serve static files instead of Apache # NOTE this will cause issues with bandwidth accounting as files wont be logged location ~* \.(gif|jpg|jpeg|png|wmv|avi|mpg|mpeg|mp4|htm|html|js|css)$ { root /home/username/public_html; expires 1d; } root /home/mydomain/public_html; } location ~* (\.jpg|\.png|\.gif|\.jpeg)$ { valid_referers blocked www.mydomain.com mydomain.com; if ($invalid_referer) { return 403; } location / { client_max_body_size 10m; client_body_buffer_size 128k; proxy_send_timeout 90; proxy_read_timeout 90; proxy_buffer_size 4k; # you can increase proxy_buffers here to suppress "an upstream response # is buffered to a temporary file" warning proxy_buffers 16 32k; proxy_busy_buffers_size 64k; proxy_temp_file_write_size 64k; proxy_connect_timeout 30s; proxy_redirect http://www.mydomain.com:81 http://www.mydomain.com; proxy_redirect http://mydomain.com:81 http://mydomain.com; proxy_pass http://ip_address/; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; expires 24h; } } How can I fix this?

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  • Missing ISOBurn context menu

    - by Tim Jarvis
    This is a slightly updated version of the question I asked here I have isoburn.exe in the system32 directory of my machine, however I am missing the context menu when right clicking an ISO image ("Burn Disk Image") Does anyone know how I can restore the context menu?

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  • How to boot a partition using a virtual pc.

    - by Fantomas
    I have backed up my failing hard drive using a ddrescue Linux command to two partition files - p1 and p2 5GB and 90GB each. Now, without saving this back to an actual disk - is there a way for me to boot my old computer virtually, using Virtual PC or Parallels or VMWare? How? Thank you.

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  • Best way to partition 1TB (Linux&Windows7)

    - by Simon
    Any intelligent way to partition 1TB and be prepared for resizing/adding/deleting partitions? I was thinking about LVM, but as far as i remember, Windows7 can't be installed on logical volume right? For now my plan is: - ~150GB for Windows7 and other stuff (VisualStudio..., maybe I'll split it 100/50 or something like that) - simple NTFS - 850GB = LVM - disk for linux (Ubuntu) and other stuff virtual machines etc. I'm mostly interested in how and what tools should I use to get easy in maintain partitions for both systems.

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  • Linux Software RAID1 Rebuild Completes, but after reboot, its degraded again

    - by zimmy6996
    I have been beating my head with an issue here, and I'm now turning to the internet for help. I have a system running Mandrake Linux, with the following configuration: /dev/hda - This is a IDE drive. Has some partitions on it that boot the system and make up most of the file system. /dev/sda - This is drive 1 of 2 for a software raid /dev/md0 /dev/sdb - This is drive 2 of 2 for a software raid /dev/md0 md0 gets mounted but fstab as /data-storage, so it is not critical to the systems ability to boot. We can comment it out of fstab, and the system works just fine either way. The problem is, we have a failed sdb drive. So I shut the box down, and have pulled the failed disk and installed a new disk. When the system boots up, /proc/mdstat shows only sda as part of the raid. I then run the various command to rebuild the RAID to /dev/sdb. Everything rebuilds correctly, and upon completion, you look at /proc/mdstat and it shows 2 drives sda1(0) and sdb1(1). Everything looks great. Then you reboot the box ... UGH!!! Once rebooted, sdb is missing again from the RAID. It is like the rebuild never happened. I can walk through the commands to rebuild it again, and it will work, but again, after reboot, the box seems to make sdb just vanish! The real odd thing is, if after reboot, I pull sda out of the box, and try to get the system to load with the rebuilt sdb drive in the system, and when I do, the system actually throws and error just after grub, and says something about drive error, and the system has to shut down. Thoughts??? I'm starting to wonder if grub has something to do with this mess. That the drive isn't being setup within grub to be visible at boot? This RAID array isn't necessary for the system to boot, but when the replacement drive is in there, without SDA it won't boot system, so it makes me believe there is something to that. On top of that, there just seems to be something wonky here the drive falling off of RAID after reboot. I've hit the point of pounding my head on the keyboard. Any help would be greatly appreciated!!!

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  • BOOTMGR is compressed Windows Server 2008

    - by AbdulAziz
    This is my first question to "superuser", hope you guys help me. I have Windows server 2008 R2 Enterprise installed in my system, by mistake I clicked the "Compress disk" of my C drive. Now when I am restarting, I met a message at start up that "BootMGR is compressed, Press Ctrl + Alt + Del to restart" Its been 2 days I am searching every where to solve the problem, but all I found only for Vista and windows 7 only. Can any one help?

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  • EBS with RAID0 (striping) and restoring snapshots

    - by grourk
    We have a MySQL database on EC2 and are looking at the disk IO performance there. Currently we have a single EBS volume with XFS and take snapshots for backup. It seems that a lot of people have seen significant performance gains by striping across multiple EBS volumes with software RAID. If this is done, how does one take snapshots and ensure the consistency of the file system? It seems to me that restoring the file system from multiple snapshots could be tricky.

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  • Forgotten account password

    - by blade
    I kept my passwords recorded but the location on my PC where I kept this went missing. I now can't get into Windows Server 2008 R2 as I can't remember the administrator or named account credentials and have no password reset disk. This is on a VM (VM Player - which btw is temp till I get Hyper-V). How can I get back in? If I make AD can I join the server to AD and then set a domain account?

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  • Can I use BitLocker on a Windows 8 Tablet? How?

    - by Coderer
    I hear that Windows 8 Pro can use full disk encryption. I also understand that Win8 is targeting the "slate" / "tablet" form factor specifically. But all my previous experience with BitLocker requires you to put in some kind of PIN or password at boot time -- how can I do this without a (hardware) keyboard? This preview of an upcoming Win8 tablet mentions BitLocker but doesn't address the PIN issue. Am I missing something?

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  • RHEL6 kick start fails with kernel panic - not syncing error

    - by mrchampe
    On a brand new (just unboxed) Dell Precision 7500 computer, I began a kickstart using a red hat boot disk and a kickstart file hosted at an http address. There is a picture of the full error below with trace information I believe this is different than the other questions relating to kernel panic errors. What I would like to know is What causes the kernel panic How does one fix this such that the kickstart finishes Additional information can be provided as necessary.

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  • File Locked on Flash Drive

    - by AtomFury
    I'm completely frustrated. I'm an owner of a OCZ 8GB Rally2 which I've used flawlessly for about 4 months now, and all of a sudden this week I begin getting errors telling me that I can't delete a file due to "make sure the disk is not write-protected, full or and the file is not in-use" dialog. Here's what I've tried: Deleting the file using FileASSASSIN (it's worked on everything else but files on this darn flash drive) Formatting the flash drive and then restoring the backed up information (I format to NTFS, FYI) Any suggestions on what to do?

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  • IE9 freezes with Protected Mode enabled

    - by Peter Wone
    After a disk failure and a new build of Win7, IE9 locks up on most web pages including Bing. Running it as Admin works, and turning off Protected Mode also works. Neither of these was necessary prior to the rebuild and examination of colleagues' workstation config show that it's only my workstation with this quirk. Can anyone suggest a remedy? I have tried bcdedit /set {current} nx AlwaysOff and a reboot, with no effect.

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  • How to disable or tune filesystem cache sharing for OpenVZ?

    - by gertvdijk
    For OpenVZ, an example of container-based virtualization, it seems that host and all guests are sharing the filesystem cache. This sounds paradoxical when talking about virtualization, but this is actually a feature of OpenVZ. It makes sense too. Because only one kernel is running, it's possible to benefit from sharing the same pages of filesystem cache in memory. And while it sounds beneficial, I think a set up here actually suffers in performance from it. Here's why I think why: my machines aren't actually sharing any files on disk so I can't benefit from this feature in OpenVZ. Several OpenVZ machines are running MySQL with MyISAM tables. MyISAM relies on the system's filesystem cache for caching of data files, unlike InnoDB's buffer pool. Also some virtual machines are known to do heavy and large I/O operations on the same filesystem in the host. For example, when running cat *.MYD > /dev/null on some large database in one machine, I saw the filesystem cache lowering in another, monitored by htop. This essentially flushes all the useful filesystem cache in guests (FIFO) and so it flushes the MySQL caches in the guests. Now users are complaining that MySQL is very slow. And it is. Some simple SELECT queries take several seconds on times disk I/O is heavily used by other machines. So, simply put: Is there a way to avoid filesystem cache being wiped out by other virtual machines in container-based virtualization? Some thoughts: Choosing algorithm for flushing filesystem cache in the kernel. (possible? how?) Reserving a certain amount of pages for a single VM. (seems no option for filesystem cache type of pages that reading man vzctl) Will running MySQL on another filesystem get me anywhere? If not, I think my alternatives are: Use KVM for MySQL-MyISAM running VMs. KVM actually assigns memory to the VM and does not allow swapping out caches unless using a balloon driver. Move to InnoDB and tune the buffer pools, dirty pages, etc. This is now considered to be 'nice to have' on the long-term as not everyone responsible for administration of the system understands InnoDB. more suggestions welcome. System software: Proxmox (now 1.9, could be upgraded to 2.x). One big LV assigned for the VMs.

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  • How to encrypt dual boot windows 7 and xp (bitlocker, truecrypt combo?) on sdd (recommended?)

    - by therobyouknow
    I would like to setup a dual boot Windows 7 and Windows XP laptop/notebook computer where each operation system's partition is fully encrypted. I would like to do this on a SSD - a 128Gb Crucial M4. My research Dual boot of truecrypt encrypted OSs on one drive (not possible - in Truecript 7.x at time of writing) This cannot be done on a standard Truecrypt setup - it will only support encrypting one of the operating systems. I have tried this and also read about it here on superuser.com However, I did see a solution here that uses grub4dos as the initial bootloader to chain to separate truecrypt encrypted OSs, in my case Windows 7 and Windows XP: http://yyzyyz.blogspot.co.uk/2010/06/truecrypt-how-to-encrypt-multiple.html I am not going to consider this solution as it relies upon some custom code for use in the bootloader that is provided by the author. I would prefer a solution that can be fully understood so that I can be sure that there is nothing undesirable occuring (i.e. malware or just simply bugs in the code). I would like to believe such a solution doesn't have those risks but I can't be sure. BitLocker and Truecrypt combination - possible solution? So I am now considering a combination of encryption programs: I now aim to encrypt Windows XP with Truecrypt and Windows 7 with BitLocker. Assuming Truecrypt bootloader can boot into non-Truecrypt OSs (e.g. via hitting Escape to go to another menu), then this solution may be viable. SSDs and Encryption (use fastest possible spinning hard disk instead (?)) I read on various superuser.com posts and elsewhere that current SSDs are not suited to whole drive encryption for various reasons: impact of performance algorithms that give SSDs advantage over spinning harddisks. Algorithms used in compression of data for example. Wear on the SSD, shortening its life Security issues whereby data is repeated, as indicated in some Truecrypt documentation So I am now considering not using SSD. But with the aim to have the fastest drive possible, I am considering using the Western Digital Scorpion black 2.5" 7200rpm harddisk as this appears to be top rated among spinning platter-based harddrives (don't work for Western Digital). Summary So to achieve whole drive encrypted dual boot Windows 7 and Windows XP with minimal performance impact I intend to use a combination of Truecrypt and Bitlocker on a top-rated conventional spinning platter-based harddisk. Questions Will my summary: achieve whole disk encryption of the dual-boot Windows XP, Windows 7? OR an you suggest a simpler solution, including one that only requires only Truecrypt (BitLocker not available on XP). Or another encryption tool, including paid-for? provide the highest performance. Am I correct to avoid using SDD with encryption for the reasons I discovered? Are the concerns about SSDs and encryption still very real (some articles I read go back to 2010) Thanks for your input!

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  • Using Ubuntu switch a failing windows 7 harddrive?

    - by firefusion
    My laptop harddrive has developed some serious read errors in the windows partition. Windows 7 still boots but every single action takes an aeon, and it is definitely due to a harddisk error not due to any spyware. I'm using the Ubuntu partition now. I've ordered a new harddrive but my laptop didn't come with a Windows 7 install disk (I think I was meant to make one with the windows 7 tools). So how can I install Windows 7 on my new harddrive?

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  • How do I transfer a Windows 7 installation to a new HDD?

    - by Nidonocu
    I've just got all the parts I need to build a new PC but the SATAII hard drive I ordered did not come and I've received an IDE drive instead. While I wait to get the correct drive type and send the new IDE drive back, is it possible to install Windows 7 on to an existing IDE drive that I have and then transfer the contents of that drive over to the new SATA disk when it arrives without Windows having any issues?

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  • Downloading video from SWF

    - by Niger
    If I am seeing a SWF video in my web browser (sample: http://www.somename.com/swf/x92154) how can I download the video to disk? If I use Save As it is saving .swf, not the video.

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  • Secure, efficient, version-preserving, filename-hiding backup implemented in this way?

    - by barrycarter
    I tried writing a "perfect" backup program (below), but ran into problems (also below). Is there an efficient/working version of this?: Assumptions: you're backing up from 'local', which you own and has limited disk space to 'remote', which has infinite disk space and belongs to someone else, so you need encryption. Network bandwidth is finite. 'local' keeps a db of backed-up files w/ this data for each file: filename, including full path file's last modified time (mtime) sha1sum of file's unencrypted contents sha1sum of file's encrypted contents Given a list of files to backup (some perhaps already backed up), the program runs 'find' and gets the full path/mtime for each file (this is fairly efficient; conversely, computing the sha1sum of each file would NOT be efficient) The program discards files whose filename and mtime are in 'local' db. The program now computes the sha1sum of the (unencrypted contents of each remaining file. If the sha1sum matches one in 'local' db, we create a special entry in 'local' db that points this file/mtime to the file/mtime of the existing entry. Effectively, we're saying "we have a backup of this file's contents, but under another filename, so no need to back it up again". For each remaining file, we encrypt the file, take the sha1sum of the encrypted file's contents, rsync the file to its sha1sum. Example: if the file's encrypted sha1sum was da39a3ee5e6b4b0d3255bfef95601890afd80709, we'd rsync it to /some/path/da/39/a3/da39a3ee5e6b4b0d3255bfef95601890afd80709 on 'remote'. Once the step above succeeds, we add the file to the 'local' db. Note that we efficiently avoid computing sha1sums and encrypting unless absolutely necessary. Note: I don't specify encryption method: this would be user's choice. The problems: We must encrypt and backup 'local' db regularly. However, 'local' db grows quickly and rsync'ing encrypted files is inefficient, since a small change in 'local' db means a big change in the encrypted version of 'local' db. We create a file on 'remote' for each file on 'local', which is ugly and excessive. We query 'local' db frequently. Even w/ indexes, these queries are slow, since we're often making one query for each file. Would be nice to speed this up by batching queries or something. Probably other problems that I've now forgotten.

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  • Why doesn't video run smoothly on my laptop anymore?

    - by andygrunt
    This might be an impossible question to answer remotely but I figure there may be some common causes that people can suggest so I think it's worth asking... Video no longer plays smoothly on my laptop. It used to but not for a while now. For example, playing a video on YouTube is pretty typical: I press play (making sure it's not on HD or even HQ) and the video buffers a little then starts to play. At first it plays fine then the video starts to stutter, turning into a slideshow while the sound continues to play smoothly. If I try playing the same video on my Playstation 3 (which is linked to the same network) it plays smoothly so it can't be the connection. Another example is streaming DivX videos. Again, I wait while it buffers and it starts but very soon, instead of a slideshow, this time the video just plays slowly while the sound continues as normal (instantly getting out of sync). Even if I let the video fully load before pressing play (i.e. it's no longer streaming), it still behaves the same way. I can even let it load 100% then save the file to hard disk and use VLC player to view it, and the same thing happens. I'm using an old laptop running Windows XP. For the past several years it's been connected to the router via Wi-Fi but in the past few days I've changed that to a network cable (like my PS3) but that hasn't helped. Yes, I regularly install various bits and pieces of software but nothing that I can identify as being the cause. So, are there known causes of this sort of behaviour and if so, what can I do to fix it? Thanks. Update to answer a few questions... Laptop Spec' (note: video has played back fine for the majority of time I've had the laptop) Toshiba Satellite 1900-603 (possibly called something else outside the UK) Intel Pentium 4 2.2 Ghz Processor Originally had 512Mb memory but recently doubled that to 1 Gig of memory Graphics: ATI Mobility Radeon 16Mb DDR VRAM Windows XP SP3 (Home edition) Over the years I've done several things to speed it up (disabling indexing etc) and am generally happy with the performance. I also regularly have a clear out of old software (if for no other reason than the laptop only has a 40Gb hard disk) and use CCleaner and Glary Utilities to strip out much of the crap from my system. Also recently (after doubling the memory), I've tried a few new things which might be likely candidates for slowing the video down such as Rocketdock, Jingle keyboard (which gives an old style 'clacky' typewriter sound when I type - love it), SugarSync, Taskbar Shuffle. However, the video doesn't play smoothly even when I try quit all these apps.

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