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Backup tape compression

- by pufferfish

What things should I check to confirm that compression is actually happening on our tape backup system? Although the tapes are marked as 200G/520G (native/compressed) capacity, they seem to fill up before the 200G mark (some less than 100G). I'm using - Sony AIT-4 tape autochanger - Sony SDX4-200C (AIT-4) tapes - Ubuntu Lucid - Bacula I've tried checking hardware compression with: tapeinfo -f /dev/nst0, which gives Product Type: Tape Drive Vendor ID: 'SONY ' Product ID: 'SDX-900V ' Revision: '0102' Attached Changer API: No SerialNumber: '0001000036' MinBlock: 2 MaxBlock: 8388608 SCSI ID: 1 SCSI LUN: 0 Ready: yes BufferedMode: yes Medium Type: Not Loaded Density Code: 0x33 BlockSize: 0 DataCompEnabled: yes DataCompCapable: yes DataDeCompEnabled: yes CompType: 0x3 DeCompType: 0x3 BOP: yes Block Position: 0 Partition 0 Remaining Kbytes: 201778000 Partition 0 Size in Kbytes: 201779000 ActivePartition: 0 EarlyWarningSize: 0 NumPartitions: 0 MaxPartitions: 0 ... so I presume it's on. Notes: The Bacula documentation says hardware compression needs to be enable with "system tools such as mt"

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How do I make an encrypted disk image on Debian?

- by Blacklight Shining

I'm basically looking for an equivalent to OS X's encrypted sparsebundles. The solution should have support for file ACLs and should not force me to specify a size in the beginning (the image should only take up as much space as it needs) or require root access to mount and unmount. Ideally, I should be able to set two different passwords (both for the same data), but that's not too important. (I do have root access to the machine and so can install packages and such, but I would rather not have to sudo just to mount an image.)

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Install Windows7 on drive with Ubuntu 12.04 already on. Is my plan good?

- by John F

I have Ubuntu 12.04 working fine, but need W7 occasionally. I just wanted to check that my plan for installing would work? Any help appreciated. Current partitions are: Partition....@ File System @ Mount Point @ Size.....@ Used.....@ Flags /dev/sda1....@ ext4........@ /ext4a......@ 37 GiB...@ 776 MiB..@ boot /dev/sda2....@ extended....@.............@ 122 GiB..@ -........@ ./dev/sda5...@ ext4........@ / ..........@ 37 GiB...@ 6 GiB....@ .unallocated @ unallocated @.............@ 7 GiB....@ - ...... @ ./dev/sda6 ..@ ext4........@ /home.......@ 77 GiB...@ 32 GiB...@ .unallocated @ unallocated @.............@ 65 GiB...@ - .......@ /dev/sda3...@ linux-swap..@.............@ 7 GiB....@ - .......@ My plan is to: - boot to ubuntu from USB ISO - change sda1 to NTFS - install W7 to sda1 - use the "Master Boot Record repair" utility to configure dual boot so I can see my original ubuntu installation as well as W7. Have I missed something? I'm concerned as to what the 776MB is that will be overwritten by the change to NTFS. It seems large for just the MBR? Would also appreciate it if anyone can explain what sda5 and 6 are being used for? Is sda5 Ubuntu and sda6 my data? Thanks in advance.

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postfix smtps issue

- by DavidC

Im currently experiencing the following issue with postfix over ssl (smtps) Apr 7 13:43:55 server88-208-248-147 postfix/smtpd[5777]: connect from xxxxxxxxxxxxxxx[xxx.xxx.xxx.xxx] Apr 7 13:45:09 server88-208-248-147 postfix/smtpd[5777]: lost connection after UNKNOWN from xxxxxxxxxxxxxxx[xxx.xxx.xxx.xxx] Apr 7 13:45:09 server88-208-248-147 postfix/smtpd[5777]: disconnect from xxxxxxxxxxxxxxx[xxx.xxx.xxx.xxx] my main.cf is as follows: smtpd_tls_cert_file = /etc/postfix/smtpd.cert smtpd_tls_key_file = /etc/postfix/smtpd.key smtpd_use_tls = yes smtp_use_tls = yes smtpd_tls_auth_only = no smtpd_tls_CAfile = /etc/postfix/caroot.crt smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_tls_loglevel = 1 when accessing smtp and running start tls i get the following: # telnet xxxxxxxxxxxxxxx 25 Trying xxxxxxxxxxxxxxx... Connected to xxxxxxxxxxxxxxx . Escape character is '^]'. 220 xxxxxxxxxxxxxxx ESMTP Postfix ehlo localhost 250-xxxxxxxxxxxxxxx 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-STARTTLS 250-AUTH PLAIN LOGIN 250-AUTH=PLAIN LOGIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN STARTTLS 220 2.0.0 Ready to start TLS please help as i'm lost of places to look now. os is Ubuntu 10.4 and the SSL is a wildcard SSL, imap/pop and apache work flawlessly with the same certificate.

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Complex shading using one single (small) texture

- by teodron

Recently I stumbled upon a demo reel in UDK about how one can attain beautiful results using just one (rather tiny) texture that's being sent to the shader pipeline. The famous link is this one. Basically, the author states that they've used just one texture and give a snapshot of the technique here. I see that every RGBA channel contains different grayscale information.. and that info could be used to inside a shader to obtain a colour blended output. The problem is that the reel displays a fairly complex scene. To top that, the author even makes use of a normal map. How did they manage to fit a normal map in an already cluttered texture? It makes sense to have a half-space normal map by using only RG from an RGB texture, but what about the rest of the information? Since it was proven to be possible, could someone please explain how it was done (the big picture, not the dirty details!)!? Here's the texture being used. Click to see in full size.

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Phantom Local Disks appearing in my drive list

- by Paul

I seem to have several phantom Local Disks mapped to different letters that are of 0 bytes in size. Strangely, they do not show up when I view my drives through Windows Explorer. But if I open an application such as ACDSee Pro or MS Word and then go to open a file I can see all these Local Disks mapped to different letters. This means when I plug in my external hard disk it ends up mapped to letter R instead of its usual G which messes up any programs I have pointing to it by default. How did they get there and more importantly, how do I get rid of them? I'm on a Window 7 Home Premium 32 bit machine.

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System reserved

- by arun sidharth

I have a HP laptop. I upgraded to windows 7 ultimate from home basic. Now I'm trying to upgrade to Windows 8 but when I do I get a message saying not enough system partition. So I opened the disk manager and increased the size of system reserved partition and it was of no use I still got the same error. Then I unfortunately deleted the 100MB system reserved partition by right clicking it and clicking format in the disk manager! Now I am not able to boot any CD's from the startup including OS and recovery CD. Whenever I press esc it always goes to the login screen and it doesn't say anything about the boot from CD option. Now I could not even use my recovery CD. I have 3 questions: Is it necesseary to create a system reserved partition if so how to create it? How to use my recovery cd How to install win 8

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Recurring Apache 2.0.52 error on CentOS 4 - 'could not create `rewrite_log_lock`'

- by warren

I have been seeing a recurring issue on my web server: [Sun May 16 03:10:19 2010] [crit] (28)No space left on device: mod_rewrite: could not create rewrite_log_lock Configuration Failed [Sun May 16 04:10:05 2010] [crit] (28)No space left on device: mod_rewrite: could not create rewrite_log_lock Configuration Failed [Sun May 16 05:10:04 2010] [crit] (28)No space left on device: mod_rewrite: could not create rewrite_log_lock Configuration Failed [Sun May 16 05:17:13 2010] [crit] (28)No space left on device: mod_rewrite: could not create rewrite_log_lock Configuration Failed So far, the only fix I have found to this when it happens is to reboot my server. This is non-ideal :-\ Restarting httpd does not clear the error. df indicates I have 20+ gigs free, and top and free both report 800+ megs (or 1.2 gigs) > df -h Filesystem Size Used Avail Use% Mounted on /dev/simfs 40G 18G 23G 44% / # > free total used free shared buffers cached Mem: 1474560 300832 1173728 0 0 0 -/+ buffers/cache: 300832 1173728 Any ideas on why this would recur, and how to prevent/fix it?

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Why is my disk full?

- by Agmenor

I installed Ubuntu 12.04 by doing a fresh install where there was previously Ubuntu 11.10. My computer warns me now that my disk is nearly full. After having run apt-get purge, run apt-get autoremove and emptied the Trash can, I still have this problem as shown by this screenshot of Gparted: The disk /dev/sda7 is indeed full. I ran the Disk Usage Analyzer (Baobab) and I am still not sure of what is happening: One of my hypothesis is that when installing Ubuntu 12.04, I didn't configure my disks well and the disk /dev/sda6 is not mounted well as /home. Is this the reason indeed? What should I do to verify this and then to get the things fixed? Here are a few additional details to answer the questions I received (thank you everybody): My home directory is not encrypted. The Backup utility (Déjà Dup) is not set for automatic backups. (I do it myself and manually.) After I mount /dev/sda6, the command df -h gives Filesystem Size Used Avail Use% Mounted on /dev/sda7 244G 221G 12G 96% / udev 3,9G 4,0K 3,9G 1% /dev tmpfs 1,6G 904K 1,6G 1% /run none 5,0M 0 5,0M 0% /run/lock none 3,9G 164K 3,9G 1% /run/shm /dev/sda6 653G 189G 433G 31% /media/8ec2fa69-039b-4c52-ab1b-034d785132a1 (sorry but formatting this into code does not work, for an unknown reason) Thanks to izx's post, I realized /dev/sda6 was not even mounted before. It contains all the documents I used to have when I was running Ubuntu 11.10.

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Difference between key_buffers and recommendation

- by Typeoneerror

I'm looking to add a bit of memory to MySQL on a Linode VPS server on which I've got a small facebook (canvas app) PHP app using MySQL running. I'm not super familiar with MySQL optimization so I'm hoping to find a simple answer. I think I want to increase the key_buffer size (the default is 16M) to something like 32M to start, but I'm not sure if I need to tweak anything else as well. All I've done so far is increase the query_cache_size to 32M from 16M. There's also key_buffer under [mysqld] and key_buffer under [isamchk]. What are the difference between those two? If I have Linode 2048MB (http://www.linode.com) VPS, what would recommend I set the buffers to? I don't expect this site to have tons of visitors, but I'd like it to be as optimized as possible. Definitely way more heavy on the database access than PHP and very few HTTP requests.

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Pipe an infinite stream to internal loop?

- by Sh3ljohn

I've seen a lot of things about redirecting stdout to a TCP socket, but no real example of how to do it in practice, specifically when the output stream generated by the first "command" never ends. To talk about something concrete, let's take programs like servers that typically output their log endlessly to stdout (well, as long as they run). If you redirect the output to a log file on the disk, then this file is always open (therefore not readable by others?) and grows infinitely, which eventually is going to cause problems. This might be a nood question, but I don't know what it does or how to do it so. How to redirect the output of a command to the internal loop? I want to make sure that data is sent EVERY time something is written to stdout, and that the pipe won't wait for the command to end (never happens ideally!). Is that right? If 2 is true, is there a buffer system to send chunks of data once it reaches a certain size only? Could you give me concrete command line examples to do the above? Thanks in advance

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Unable to get to remote samba share

- by tubaguy50035

I have a remote VPS that I would like to setup samba on and only allow my IP access to it. I currently have in my smb.conf: [global] netbios name = apollo security = user encrypt passwords = true socket options = TCP_NODELAY printing = bsd log level = 3 log file = /var/log/samba/log/%m debug timestamp = yes max log size = 100 [hosting] path = /hosting/ comment = Hosting Folder browseable = yes read only = yes guest account = yes valid users = nick I have the ports (137,138,139,445) open in iptables (they're open to everyone right now while I debug) and I see nothing in the syslog about iptables blocking my requests. When I try to open a file browser to my address \\ipaddress, it hangs for a good thirty seconds, and then opens a log in box. I enter my user name and password for the server, hit okay. It then opens the same box, I enter my credentials again and hit enter. Windows then tells me it could not connect. My user account is added to Samba already. Anybody have any suggestions what I can do to get this working?

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2 HDs in RAID 1 with 2 partitions ?

- by Prix

Hi, i am not very familiar with raid partitons and am not even sure if this is the right place to ask about it, but i hope that if it is not that some one can point me on the right direction. This is my situation, i have 2 500 GB hds and a 3ware pci-e hardware for raid and i wanted to make a RAID 1 but i dont know if i can make more then one partition for it, for instance: MAIN HD: os partition: 100GB data partition: rest of left size and make the RAID 1 either work on all the HD or just on the data partition of it. that is on windows xp sp3 and the 3ware allows bootable raid.

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Upload large database SQL file

- by Devy

I've a database of more than 20Gb of size on my hard disk. What is the best way to upload it with the least (money) load possible on the server? - I'm on Windows 7. - I have FTP and SSH access on the server. I avoid using FTP because my connection cuts off a lot, I can't imagine I re-upload again the file after failing on 99%. I found some tools that split the large .sql file to small .sql files, but they didn't mention how to gather these files again into one file. Another way is to archive the big .sql file to .rar with -v option, upload them through FTP then unpack them. But unpacking will also cost, right? I know it will cost in any cases, but any best practice will be strongly appreciated.

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Samba + Centos (Share not working)

- by mplacona

I've done this a few times already, but for some reason this time it's not working. I have a folder called ruby (root:root - 0777) on /home/placona I'm trying to see this folder from my WindowsXP box, but keep getting permission denied. I can see the global share though, but whenever I try clicking on the ruby share, it won't let me in. Here's my smb.conf settings: [global] log file = /var/log/samba/samba.%m guest account = nobody netbios name = DEVBOX server string = DEVBOX CENTOS workgroup = WORKGROUP encrypt passwords = yes security = share max log size = 50 [ruby] path = /home/placona/ruby I want to be able to open this folder without using password (hence the guest account = nobody). I tried even with password, but never seems to work. Can anyone spot anything wrong with my settings?

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Error while mounting home directory on different logical volume

- by RCola

I created RAID 5 form 3 hard drives. Formatted as ext4 this raid array. Created VG0 group and lv_home logical volume in LVM. Then I tried to mount default /home directory on lv_home, while trying to mount logical volume lv_home to folder containing user profiles /home, getting error: mount: wrong fs type, bad option, bad superblock on /dev/mapper/VG0-lv_home next is seems to be symbolic link: # file -s /dev/VG0/lv_home /dev/VG0/lv_home: symbolic link to `../mapper/VG0-lv_home' then # file -s /dev/mapper/VG0-lv_home /dev/mapper/VG0-lv_home: data and lvm> pvs PV VG Fmt Attr PSize PFree /dev/md0 VG0 lvm2 a- 2.02g 68.00m lvm> lvdisplay --- Logical volume --- LV Name /dev/VG0/lv_home VG Name VG0 LV UUID WzJus7-2yV8-yhog-Ju1b-TpWH-IIAI-LIutwe LV Write Access read/write LV Status available # open 0 LV Size 1.17 GiB Current LE 300 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 251:0

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SAMBA and Linux ACLs -- "Permission denied" on write to share but file written nevertheless

- by MCH

I set up a writable share directory "/home/net/share" with acl like this: sudo mkdir -p "/home/net/share" sudo setfacl -m "u:localuser:rwx,u:remoteuser:rwx,g:users:rwx" "/home/net/share" My /etc/samba/smb.conf looks like this: [global] workgroup = w server string = server security = user load printers = no log file = /var/log/samba/%m.log max log size = 50 dns proxy = no printing = bsd printcap name = /dev/null disable spoolss = yes encrypt passwords = true invalid users = nobody root follow symlinks = yes wide links = yes [share] comment = Writable by localuser and remoteuser path = /home/net/share valid users = remoteuser read only = no public = no printable = no Locally, localuser and remoteuser have user accounts and smbpasswds and can both read, create and delete files in /home/net/share. But when I log on from a different machine (like this: sudo mount -t cifs //server/share mountpoint/ -o username=remoteuser ), I get "Permission denied" both when trying to create directories and files, oddly though, it does create files (not directories!) despite these messages! How can I get this working?

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video editing tool to color overlay a specific part

- by Santosh

I have downloaded a video from YouTube. But the uploader has put some link (their twitter and facebook) for promotional purpose. The links keeps coming up through out the video in the black area (up and down of the video which are black). Thank god that links are on the black part of the video otherwise it would be hard to remove. Also I want to remove the the last few seconds of the video. I don't want to crop that part. The video is in MP4 format. I don't want to lose the quality in anyway, I won't mind if the file size increases. I want a opensource and free tool. Good if it is available to both Windows and Ubuntu. Here is a link to the video.

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Multiple .bkf files created in Backupexec 12.5 or 2010 related to heavy I/O?

- by syuusuke

Hey everyone, I was wondering if anyone who has used backupexec 12.5 or 2010 have ever experienced multiple .bkf files created for a single job. To describe what I mean by multiple files, the .bkf are being created with random file sizes under 2GB even though I've assigned the setting to chop the file after 10GB size. Some jobs will create 20x .bkf files in 1 job with file chunks ranging from 50MB to 800MB sizes. Is this is a sign of heavy I/O issues? Bandwidth limitations? I'm not sure, I'm here to seek some advices and suggestions. I've setup another backup server with the same exact settings and they seem to create a new .bkf file when 10GB limit has been reached. Although I am backing up different machines but I know my settings are an exact match to the problematic or atleast I think it's a problem.

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Zip files way larger on a Mac using Finder than the 'zip' command.. 2x larger.

- by user33947

I have a directory of JPEG's. Each one is roughly 90k, as reported by Photoshop when saving, and also reported by the command line function 'ls'.. When I get the properties for the file with Finder, it's double that, over 220k. Zipping it with finder will also package this bulk as well. Doing the "zip -v test.zip ./dir" command will make a MUCH smaller zip file. Zipping the files on windows also results in a much smaller file size as well, roughly the same to that of the unix zip command. File sizes are also reported correctly on windows. I can't find any mention of this anywhere, so I'm asking here.

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Virtualbox, merging snapshots and base disk

- by Henrik

Hi, I have a virtual machine with about 30 snapshots in branches. The current development path is 22 snapshots plus the base disk. The amount of files is seemingly having an impact now on IO and the dev laptop I'm using (don't know if it is host disk performance issues with the 140GB total size over a lot of fragments, or just the fact that it is hitting sectors distributed across a lot of files). I would like to merge the current development branch of snapshots together with the base disk, but I am unsure if the following command would produce the correct outcome. I am not able to boot this disk after the procedure completes (5-6 hours). vboxmanage clonehd "C:\VPC-Storage\.VirtualBox\Machines\CRM\Snapshots\{245b27ac-e658-470a-b978-8e62137c33b1}.vhd" "E:\crm-20100624.vhd" --format VHD --type normal Could anyone confirm if this is the correct approach or not?

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using "touch" to create directories?

- by user66732

1) in the "A" directory: find . -type f a.txt 2) in the "B" directory: cat a.txt | while read FILENAMES; do touch "$FILENAMES"; done 3) Result: the 2) "creates the files" [i mean only with the same filename, but with 0 Byte size] ok. But if there are subdirs in the "A" directory, then the 2) can't create the files in the subdir, because there are no directories in it. Question: is there a way, that "touch" can create directories?

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using "touch" to create directories?

- by user62367

1) in the "A" directory: find . -type f a.txt 2) in the "B" directory: cat a.txt | while read FILENAMES; do touch "$FILENAMES"; done 3) Result: the 2) "creates the files" [i mean only with the same filename, but with 0 Byte size] ok. But if there are subdirs in the "A" directory, then the 2) can't create the files in the subdir, because there are no directories in it. Question: is there a way, that "touch" can create directories?

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What are some best practices for minimizing code?

- by CrystalBlue

While maintaining the sites our development team has created, we have come across include files and plugins that have proven to be very useful to more then one part of our applications. Most of these modules have come with two different files, a normal source file and a min file. Seeing that the performance and speed of a page can be increased by minimizing the size of the file, we're looking into doing that to our pages as well. The problem that we run into is a lot of our normal pages (written in ASP classic) is a mix of HTML, ASP, Javascript, CSS, and include files. We have some pages that have their JS both in include files and in the page, depending on if the function is only really used in that page or if it's used in many other pages. For example, we have a common.js and an ajax.js file, both are used in a lot of pages, but not all of them. As well as having some functions in a page that doesn't really make sense to put into one master page. What I have seen a few other people do online is use one master JS file and place all of their javascript into that, minify it, gzip it, and only use that on their production server. Again, this would be great, but I don't know if that fully works for our purposes. What I'm looking for is some direction to go with on this. I'm in favor of taking all of our JS and putting it in one include file, and just having it included in every page that is hit. However, not every page we have needs every bit of JS. So would it be worth the compilation and minifying of the files into one master file and include it everywhere, or would it be better to minify all other files and still include them on a need-to-use basis?

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Saving 16:9 video in Movie Maker without black border

- by Tschareck

I'm editing my video in Windows Live Movie Maker from Live Essentials 2011. My source video is from camera and is .mp4 format with size of 1280 x 720. After editing in Movie Maker, I save the movie. And no matter what option I chose, I always end up with .wmv file, that is either 4:3 image with black stripes above and below the video, or 16:9 with black frame all around the image. What settings should I use, to be able to export or save the video in 1280 x 720 without any black border?

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