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• How can I tell if ZFS (zfs-fuse) dedup/compression is applied to a particular file?

  - by asari

  I have a zfs formatted partition using zfs-fuse for linux (Ubuntu). I had used it for a while, and then enabled dedup and compression on it (zfs set compression=on/dedup=on). Now I think I have some files that are dedup'ed and compressed, and file that are not yet. It was OK, but sometimes I was confused. Let's see, following command would consume almost 4GB of my zfs storage: cp oldfile.4GB newfile.4GB .. and this would consume almost zero: cp newfile.4GB newfile.4GB.2 This is because the old file is not yet compressed, so dedup not happened, I think. My idea is -- if I can find old files that are not yet dedup/compressed, I can perform batch copy/rename/remove them to eliminate duplicity and redundancy. But how I can check that? I know I can re-copy whole contents of my storage should work (even better with checking the time stamp of each file), but I'd be happier if I have zfsstat-like tool that shows some file properties.

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• How to reference other locations in making multi-boot live cd

  - by Nrew

  There is a tool in pen drive linux that allows you to boot directly with multiple iso files. And here is a sample in the menu.lst which allows you to choose which iso file you want to boot. title Fedora 13 find --set-root /Fedora-12-i686-L.iso map /ubuntu-10.04-desktop-i386.iso (0xff) map --hook root (0xff) kernel /casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper persistent iso-scan/filename=/ubuntu-10.04-desktop-i386.iso splash initrd /casper/initrd.lz I'm just using it on my 8gb flash drive and the location of the iso file is in the flash drive itself. Is it possible to reference other locations. So that I could boot from it, without limitations. because the flash drive can only contain 8gb of data. Is it possible? Anyone here tried this before?

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• Missing autochk program during boot

  - by a sandwhich

  I just resized a windows partition which involved shifting about 160GB to the left. After that it couldn't find the boot like normal so I ran the system repair tool like normal(I resize this partition a lot and each time I have to use the repair disk). But, this time, when I rebooted into the recovered 7 partition, it displayed the windows logo like normal but then flashed up autochk program not found -- skipping autocheck After that being on the screen for about 8 seconds, there was a flash of a bluescreen with white text and it rebooted. I have tried running the repair disk multiple times, but it returns and fixes the same problem each time, and the same thing happens on boot each time. Is there anything I can do to fix this short of reinstalling Windows? I have also ran two chkdsks from my vista partition with no errors reported and when viewing all the files on the drive everything seems to be in place.

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• How can I send a Wake on Wireless LAN (WoWLAN) / Wake on Demand request manually?

  - by pioto

  This is similar to, but not the same as, http://serverfault.com/questions/1721/is-wireless-wake-on-lan-possible. I know it is supposed to be possible. The question is, how do I do whatever the AirPort Basestation will do? All I can find so far is that supposedly I need to send something with Wireless Multimedia Extensions (WMM): Basically, I want to be able to wake up my Mac Mini remotely, probably using my Linux laptop. Does anyone know of a tool to do this? Basic Wake on LAN tools do not seem to be the right thing. I don't need the Sleep Proxy Service bit, because I already know the MAC address of the system I want to wake up.

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• How can I rip a DVD but merge/join episodes

  - by Nifle

  Some background. I have the Pink Panther Collection, they have about 30 episodes on each DVD. Now I want to watch this on my $MobileDevice. So I went and converted it to m4v or avi. This of course went splendid with both Handbrake and AutoGK but the problem is that I want ONE file per DVD, both Handbrake and AutoGK creates one file per episode. So here finally is my question. Does anyone know how to persuade Handbrake or AutoGK to create one video file with all the episodes? Or can anyone recommend another (free/cheep) tool for the job? Oh and no cheating by telling me to join the files after conversion. I have never found a video joiner that did not disappoint me (usually bad audio sync).

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• Truecrypt or default Disk Utility on Mac?

  - by Kaushik Gopal

  Windows by default doesn't come with a password protect folder option (other that Win7 ultimate), so I used to swear by Truecrypt which was great. But I've read in a couple of places that Mac OS X by default has a way of protecting folders using the Default Disk Utility. So my question is which is better, using TrueCrypt on the Mac or just sticking with the default Disk Utils app? Can somebody let me know the advantages of one over the other? A summary from the very helpful answers below: if you're looking for cross-platform usage Truecrypt is the obvious tool of choice if you're looking for convenience, and intend to stick only to the Mac platform, use the default Disk Utils app.

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• Recover Intel Matrix Raid Configuration

  - by Catalin DICU

  Hello, I had 2 HDDs in Intel Matrix Raid configuration on a motherboard with intel ICH9R. I had some RAID 0 partitions and one RAID 1 partition. Somehow when replacing my videocard I partially unpulugged the power connector from one of the HDD. I booted and only one disk was showing. So I turned off the PC and correctly plugged the power connector and how both HDDs are showing as "Non-Raid Disk" Is there a way to restore the raid configuration from before ? In fact I don't really remember how my partitions where configured, I had 2x100Gb + 1x296Gb in RAID 0 and one 50Gb in RAID 1 (using 2x320Gb HDDs) but I'm not sure how many volumes and how the partitions where allocated on the volumes. Is there a tool to find that ? Thanks

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• Convert from port numbers to protocol names in wireshark

  - by Berkay

  i'm simply using tshark -r botnet.pcap -T fields -E separator=';' -e ip.src -e tcp.srcport -e ip.dst -e tcp.dstport '(tcp.flags.syn == 1 and tcp.flags.ack == 0)' to see the all initiated "legal TCP" connections. However, i need the destination port number conversion to "http" "netbios" etc. i'm not using -n option, but still i get: 128.3.45.128;62259;208.233.189.150;80 This is what i'm trying to get: 128.3.45.128;62259;208.233.189.150;http or 128.3.45.128;62259;208.233.189.150;80;http is better option for me. any idea from tshark users? or any other tool suggestions?

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• Can I find which script outputs which error?

  - by ibrahim

  There is a script which calls other scripts and they call others... I don't know exactly which scripts are called and how many of them. I only know that some of them are adding iptables rules and I get this error when I call root script. iptables: No chain/target/match by that name. iptables: No chain/target/match by that name. My problem is that I can not find which script outputs this errors. Is there any way or tool to learn that?

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• Can I ? - Develop C/C++ in Fedora 14 using GCC 4.4 and deploy in CentOS 5.2 using GCC 4.4

  - by Amit Phatarphekar

  Hello - My production env runs CentOS 5.2 and 5.5 versions. I have to develop a new tool using C/C++ and deploy it on this production env. I was planning to use Fedora 14 on my desktop with GCC 4.4 to do the development with Eclipse IDE. And then later I want to deploy the executables to CentOS 5.2 or 5.5 The production env will have GCC 4.4 as well. Since both Fedora and CentOS are RHEL based, I thought this is possible. So can I do this? Or do I need to have CentOS 5.2/5.5 on my development desktop as well? Thanks Amit

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• Test disk recovery

  - by AIB

  I had a 250GB hard disk having several NTFS partitions. The disk was a dynamic disk (created in windows). Now when I formatted windows (which was in another disk), the dynamic disk is shown as offline. I tried using the testdisk tool to recover the data and created a partial backup. Testdisk is able to list all partitions in the disk. All partitions are shown as type 'D' (Deleted). I want to change the 'D' to 'P' (Primary), 'L'(Logical), 'E' (Extended) appropriately and build a new partition table. If I can write the partition table to disk, the disk will be of 'basic' type and should be readable in all OS. What should be the appropriate partition types? I checked the files on the partitions and no OS was ound. So none of the partitions were bootable. Will randomly selecting P,L,E hurt the data in anyway?

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• Windows 7 x64 how to verify integrity of ALL files on an NTFS disk?

  - by kilves76

  Looking for a tool that would verify integrity of ALL files on a Windows 7 x64 NTFS disk reliably? This is for testing of experimental defrag software, so it really needs to be secure and foolproof. I know it will take a long time, there's millions of files on the disk, but safety just cannot be compromised in a situation like this. Freeware solution much preferred. Can be either Windows software (=inducing pitfalls about files changing due to booting Windows) or a stand alone boot (for example linux boot cd + usb key for storing chksum/metadata).

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• What is the best software to capture full-screen 3h programming session in Windows?

  - by Hugo S Ferreira

  Hi, I'm planning a laboratorial experiment to assess behavior of groups when programming using some tools under study. For that, I'll need to capture their entire screen to disk. Mostly, what will be displayed is code, so I'm not to worried with image quality. However, it's paramount that the team is not able to stop the recording by accident, and the tool should be rebust enough to hold at least 3h of video. If possible, it would be nice for researchers in other rooms to "watch" the video as it is recording. Actually, this last requirement reminded me that I could use a VNC recording software, and install a VNC client in each laboratory computer. Anyway, what is your experience with this? Which software do you recommend? Thanks.

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• How does iperf calculate throughput and jitter?

  - by Someone

  I've read that iperf basically tries to send as much information down a connection as quickly as possible reporting on the throughput achieved. This tool is especially useful in determining the volume of data that links between two machines can supply. is it possible to gather the same results by sending regular data, as in not testing data? what I'm trying to do is this; sending data in the foreground while in the back ground gather statistics (throughput and jitter). so can anyone tell me how iperf calculates these two values ?

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• Is there a "Run Level Configurator" for Windows XP?

  - by djangofan

  I have been having trouble with something causing my Windows XP system to take 6-8 minutes to startup from a cold boot. Something is happening during startup that is causing the system to crawl. I have a lot of Linux experience , especially configuring run levels so that some programs start before others do. I also know how to do that on Windows XP but its really complex, and with 50 services I'd have to keep a giant spreadsheet to keep it all organized. Is there such a thing as a Windows XP Tool that "emulates" the Linux run-level editors that I can use to control the order than services start on my system?

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• Convert a gray PNG with alpha to a 1-bit black rectanble with 8-bit alpha

  - by jcayzac

  I use a tool to render LaTeX equations as PNG. The resulting images are in RGBA8888 format. I would like to extract the luminance (grayscale from RGB channels, multiplied by the A channel) as my new alpha channel, set the picture fully black, and save the result in Gray1Alpha8 (G1A8) format. So far I've only managed to get G1A4 or G8A8 but not G1A8. Also, the resulting picture looks like it's not multiplied correctly… convert original.png \ \( -clone 0 -alpha extract \) \ \( -clone 0 -clone 1 -compose multiply -composite \) \ -delete 0 +swap -alpha off -compose copy_opacity -composite -colorspace Gray -depth 4 result.png What am I missing?

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• dead man's switch for remote networking interventions

  - by ascobol

  Hi, As I'm going to change the network configuration of a remote server, I was thinking of some security mechanisms to protect me from accidentally loosing control on the server. The level-0 protection I'm using is a scheduled system reboot: # at now+x minutes > reboot > ctrl+D where x is the delay before reboot. While this works relatevly well for very simple tasks like playing with iptables this method has at least two drawbacks: It's not very reactive, ie a connectivity problem should be detected automatically if for example an automatic remote ssh command fails does not work anymore for x seconds. It can obviously not work if one need to modify some configuration files and then reboot to test the changes. Are you guys using some tool for the second point ? I would love to have something able to revert the system configuration in a previously known stable state if I can't join the server X minutes after reboot. Thanks!

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• Monitoring Maximum Process Network Activity

  - by user125973

  We have a collocated server on which we run some OpenVZ hosts. Recently, we have had to pay a lot extra we keep exceeding our bandwidth quota. Our quota is 5 Mb/s but we have spike to almost 50. I looked at the graphs and there are some spikes happening at some intervals. I want to know which process is causing this so I need a tool that monitors the processes and gives me the one with the maximum instant traffic (It doesn't matter how much traffic we have as long as we don't exceed the 5Mb/s quota). Does anyone have a recommendation for this? My hosts are CentOS 5 with OpenVZ so I can see all the containter processes from the host, if that helps in any way.

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• Sonicwall settings for Polycom TFTP

  - by Michael Glenn

  I'm switching our VoIP phones (Polycom 301s and 501s) to our data network. They were previously segmented to their own network. This means disabling the DHCP on the Trixbox (Asterisk) server and configuring the Sonicwall TZ 210 DHCP to indicate that Trixbox is the TFTP server. The Polycom phones are stating "could not contact boot server". All phones are configured to TFTP and were confirmed working when previously using the Trixbox server for DHCP. Trixbox DHCP is now turned off. I've configured options 66(as String), 128(as IP) and 150(as IP) in DHCP and added them to a TFTP Option Group. I've enabled "Allow BOOTP Clients to use Range" for the Dynamic IP range and assigned the Option Group TFTP as the DHCP Generic Option Group. Any idea what I'm missing? Is there a separate tool to inspect the DHCP response to compare Trixbox to the Sonicwall?

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• Recover RAID 5 data after created new array instead of re-using

  - by Brigadieren

  Folks please help - I am a newb with a major headache at hand (perfect storm situation). I have a 3 1tb hdd on my ubuntu 11.04 configured as software raid 5. The data had been copied weekly onto another separate off the computer hard drive until that completely failed and was thrown away. A few days back we had a power outage and after rebooting my box wouldn't mount the raid. In my infinite wisdom I entered mdadm --create -f... command instead of mdadm --assemble and didn't notice the travesty that I had done until after. It started the array degraded and proceeded with building and syncing it which took ~10 hours. After I was back I saw that that the array is successfully up and running but the raid is not I mean the individual drives are partitioned (partition type f8 ) but the md0 device is not. Realizing in horror what I have done I am trying to find some solutions. I just pray that --create didn't overwrite entire content of the hard driver. Could someone PLEASE help me out with this - the data that's on the drive is very important and unique ~10 years of photos, docs, etc. Is it possible that by specifying the participating hard drives in wrong order can make mdadm overwrite them? when I do mdadm --examine --scan I get something like ARRAY /dev/md/0 metadata=1.2 UUID=f1b4084a:720b5712:6d03b9e9:43afe51b name=<hostname>:0 Interestingly enough name used to be 'raid' and not the host hame with :0 appended. Here is the 'sanitized' config entries: DEVICE /dev/sdf1 /dev/sde1 /dev/sdd1 CREATE owner=root group=disk mode=0660 auto=yes HOMEHOST <system> MAILADDR root ARRAY /dev/md0 metadata=1.2 name=tanserv:0 UUID=f1b4084a:720b5712:6d03b9e9:43afe51b Here is the output from mdstat cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid5 sdd1[0] sdf1[3] sde1[1] 1953517568 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU] unused devices: <none> fdisk shows the following: fdisk -l Disk /dev/sda: 80.0 GB, 80026361856 bytes 255 heads, 63 sectors/track, 9729 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000bf62e Device Boot Start End Blocks Id System /dev/sda1 * 1 9443 75846656 83 Linux /dev/sda2 9443 9730 2301953 5 Extended /dev/sda5 9443 9730 2301952 82 Linux swap / Solaris Disk /dev/sdb: 750.2 GB, 750156374016 bytes 255 heads, 63 sectors/track, 91201 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000de8dd Device Boot Start End Blocks Id System /dev/sdb1 1 91201 732572001 8e Linux LVM Disk /dev/sdc: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00056a17 Device Boot Start End Blocks Id System /dev/sdc1 1 60801 488384001 8e Linux LVM Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000ca948 Device Boot Start End Blocks Id System /dev/sdd1 1 121601 976760001 fd Linux raid autodetect Disk /dev/dm-0: 1250.3 GB, 1250254913536 bytes 255 heads, 63 sectors/track, 152001 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/dm-0 doesn't contain a valid partition table Disk /dev/sde: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x93a66687 Device Boot Start End Blocks Id System /dev/sde1 1 121601 976760001 fd Linux raid autodetect Disk /dev/sdf: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xe6edc059 Device Boot Start End Blocks Id System /dev/sdf1 1 121601 976760001 fd Linux raid autodetect Disk /dev/md0: 2000.4 GB, 2000401989632 bytes 2 heads, 4 sectors/track, 488379392 cylinders Units = cylinders of 8 * 512 = 4096 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 524288 bytes / 1048576 bytes Disk identifier: 0x00000000 Disk /dev/md0 doesn't contain a valid partition table Per suggestions I did clean up the superblocks and re-created the array with --assume-clean option but with no luck at all. Is there any tool that will help me to revive at least some of the data? Can someone tell me what and how the mdadm --create does when syncs to destroy the data so I can write a tool to un-do whatever was done? After the re-creating of the raid I run fsck.ext4 /dev/md0 and here is the output root@tanserv:/etc/mdadm# fsck.ext4 /dev/md0 e2fsck 1.41.14 (22-Dec-2010) fsck.ext4: Superblock invalid, trying backup blocks... fsck.ext4: Bad magic number in super-block while trying to open /dev/md0 The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it really contains an ext2 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 8193 Per Shanes' suggestion I tried root@tanserv:/home/mushegh# mkfs.ext4 -n /dev/md0 mke2fs 1.41.14 (22-Dec-2010) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=128 blocks, Stripe width=256 blocks 122101760 inodes, 488379392 blocks 24418969 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=0 14905 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 102400000, 214990848 and run fsck.ext4 with every backup block but all returned the following: root@tanserv:/home/mushegh# fsck.ext4 -b 214990848 /dev/md0 e2fsck 1.41.14 (22-Dec-2010) fsck.ext4: Invalid argument while trying to open /dev/md0 The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it really contains an ext2 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 8193 <device> Any suggestions? Regards!

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• Updating from OSX Lion 10.7.2 to 10.7.4

  - by Ozair Kafray

  I just got my Mac upgraded to 10.7.2, just to be able to install Xcode 4.3.3. However, when I try to install Xcode 4.3.3, it says that it requires a minimum of OSX 10.7.3. Then using the "Software Upgrade" tool it detects successfully for me that a combined upgrade to 10.7.4 is available. As I select Install Item, the download starts however, it fails after complete download (taking two hours) saying something like "the update cannot be saved". I have done this twice already, and followed it up until 5 minutes were left. I have also checked that there is enough space (60 GB) available on my hard disk, while the update requires around 1.5 GB. The question is what is causing the problem mentioned in bold above.

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• Whatsup gold reporting

  - by rotard

  I work for an IT consulting company, and we use WhatsUp Gold to monitor our and our clients' servers. WUG works, and provides all the data we need in a reasonably useful format. However, management wants to use it as a sales tool. They want more attractive reports that they can hand off to clients and prospective clients to show off how slick our monitoring software is. Is there a third-party solution that will generate more attractive reports based on data in the WUG database? I have already suggested using reporting services to build our own reports, but that idea was rejected.

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• What is the S.M.A.R.T. page?

  - by Mads Skjern

  I've just listened to Steve Gibson talk about his SpinRite software, on the Security Now podcast episode 336 (transscript). At 33:20 he says: I can show and do show on the SMART page that sectors are being relocated and that errors are being corrected. That SMART analysis page sometimes scares people because it shows, wait a minute, this thing says we're correcting so many errors per megabyte. What is this SMART page? 1) Some information saved on the HD by SMART, that I can access with a SMART tool like smartmontools? 2) A page (tab) in his SpinRite software? In any case, can I see, in any way, what sectors are marked as bad, without using SpinRite? Preferably using smartmontools!

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• Linking RSA with Logstash etc

  - by Anuj

  i was wondering whether we can use logstash or any other opn source or free Log management too to collect,index the data and then feed this index into RSA envision or any other enterprise SIEM tool. Will this be beneficial in any way? Also are the indexes of various Log Management and SIEM tools -- splunk,RSA envision,HP Arcsight Logger and Logstash etc compatiable with each other. My organization is planning to buy RSA envision appliance and is there any way to restrict or select only certian type of log files eg: security logs or apache logs .. so that onlt those are monitored and this will reduce the EPS(events per second).

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• Windows 7 backup to 3TB Seagate external drive got 0x8078002A error [migrated]

  - by Zhang18

  I'm using the Windows 7 backup and restore utility to create a system image and personal file backup to an external Seagate GoFlex 3TB disk. I got the following error: One of the backup files could not be created. Details: The request could not be performed because of an I/O device error. Error code: 0x8078002A I searched all over the internet and found these two related discussions (discussion 1 and discussion 2). Note the 1st discussion is for a Western Digital drive, which seem to have a solution with the WD Quick Formatter tool. But I downloaded that software and it cannot detect my Seagate drive. The 2nd discussion is directly relevant but it does not offer a solution. I've spent days on this and am at a loss... Please help if you know what to do to make it work! Thank you!

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