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• Linux RAID0 - relocating member disk

  - by qdot

  I've got an issue I would rather handle with the array online - I am using RAID0 for temporary video storage - data that is low-cost to restore, but that is used frequently. The software array looks like this: md1 : active raid0 sdb1[2] sdc1[3] sdd1[0] sde1[1] 1953487616 blocks 64k chunks I have another partition (sda1) in this system, that I want to use to replace sdc1 (The drives are of varying age, and sdc1 is definitely the slowest one, limiting the entire array's sequential read performance to only 300MB/s). Is there a way to migrate the data from sdc1 to sda1 while the array is still online?

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• Why is my email server in AT&T's blacklist?

  - by legoscia

  I just got this bounce message: <¦¦¦¦¦¦¦¦@att.net>: host scc-mailrelay.att.net[204.127.208.75] said: 521-88.208.246.34 blocked by sbc:blacklist.mailrelay.att.net. 521 DNSRBL: Blocked for abuse. See http://att.net/blocks (in reply to MAIL FROM command) So I'm trying to figure out why our server ended up on their blacklist. The web page link doesn't tell me why, as far as I can see. From a few multi-RBL tools I conclude that our IP is only on the collateral damage lists of uceprotect.net (you can be exempt from that with a paid subscription), and I dearly hope that AT&T doesn't use that. From the mail server logs I see that an email to another @att.net address went through two days ago without being blocked. Does anyone have any ideas how I can find out what went wrong?

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• How can I use a Windows 2003 server as a HTTP proxy?

  - by Will

  I'd like to set up an HTTP proxy on a windows 2003 server so that I can access blocked websites such as YouTube from behind a corporate firewall (DAMN THE MAN!). I've never done this before, so I'm not even sure if the picture I have in my head is valid or possible. So I'm stuck behind a firewall that blocks sites that I need to access occasionally but that are blocked because of abuse by slackers. I've got a Windows 2003 server hosted out on the internet (i.e., outside of this odious firewall). I know I can configure my browser to use a proxy for my HTTP traffic, so why not use my server? What I'd like to know is: Is my concept valid? Can this be done, and will it work? How do I configure my server to act as a proxy? What applications may I have to install? Free is fine but don't leave out commercial software TIA

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• How do you synchronise huge sparse files (VM disk images) between machines?

  - by chrisdew

  Is there a command, such as rsync, which can synchronise huge, sparse, files from one linux server to another? It is very important that the destination file remains sparse. It may be longer (but not bigger) than the drive which contains it. Only changed blocks should be sent across the wire. I have tried rsync, but got no joy. groups.google.com/group/mailing.unix.rsync/browse_thread/thread/94f39271980513d3 If I write a programme to do this, am I just reinventing the wheel? http://www.finalcog.com/synchronise-block-devices Thanks, Chris.

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• VFS and FS i-node difference

  - by gaffcz

  What is the difference between VFS i-node and FS (e.g. EXT) i-node? Is it possible that EXT i-node is persistent (contains/points to data blocks), but VFS i-node is created just in i-node cache after read/use of EXT i-node? Or the VFS i-node is just an image of FS i-node (it's the same) and i-nodes in those systems, which are not working with i-nodes (e.g. FAT, NTFS) has to be emulated (HOW?) to allow VFS work with those FS like they would support i-nodes?

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• A space-efficient filesystem for grow-as-needed virtual disks ?

  - by Steve Schnepp

  A common practice is to use non-preallocated virtual disks. Since they only grow as needed, it makes them perfect for fast backup, overallocation and creation speed. Since file systems are usually based on physical disks they have the tendency to use the whole area available1 in order to increase the speed2 or reliability3. I'm searching a filesystem that does the exact opposite : try to touch the minimum blocks need by an aggressive block reuse. I would happily trade some performance for space usage. There is already a similar question, but it is rather general. I have very specific goal : space-efficiency. 1. Like page caching uses all the free physical memory 2. Canonical example : online defragmentation 3. Canonical example : snapshotting

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• Blocked Chrome by Company's Proxy

  - by gol.d.ace

  Chrome has just suddenly being blocked by my company for accessing internet. Instead, IE still works fine. It blocks the connection, the error says that my Chrome connection is timeout & the server is not responding Error 118 (net::ERR_CONNECTION_TIMED_OUT): The operation timed out). I guess the reason behind this is to standardize all user's browser for only using IE for security reason. I have tried to change the user-agent string (--user-agent="... ") so that the Chrome will pretend to be as IE. and yet, still not working! Could anyone shed my problem here? IE is just not comfortable so-called for surfing the web!

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• Mounting Solaris UFS partition on Debian(with FreeBSD kernel)

  - by hayalci

  I have some disks that were being used on a Solaris system. The disks are formatted as UFS. I attached them to a Debian system (with FreeBSD kernel. Debian/kFreeBSD), but I cannot mount them. $ mount -t ufs /dev/da2s1 /mnt/diska mount: /dev/da2s1 : Invalid argument Also the tunefs.ufs does not work; $ tunefs.ufs -p /dev/da2s1 tunefs.ufs: /dev/da2s1: could not read superblock to fill out disk Is there an incompatibility between FreeBSD UFS and Solaris UFS? Is it possible to mount one, under the other OS ? Note: tunefs.ufs works on the root partition $ tunefs.ufs -p /dev/da7s2 tunefs.ufs: ACLs: (-a) disabled tunefs.ufs: MAC multilabel: (-l) disabled tunefs.ufs: soft updates: (-n) disabled tunefs.ufs: gjournal: (-J) disabled tunefs.ufs: maximum blocks per file in a cylinder group: (-e) 2048 tunefs.ufs: average file size: (-f) 16384 tunefs.ufs: average number of files in a directory: (-s) 64 tunefs.ufs: minimum percentage of free space: (-m) 8% tunefs.ufs: optimization preference: (-o) time tunefs.ufs: volume label: (-L)

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• Cant remove/delete symlink

  - by user477519

  I have tried to create a symlink and it threw this error: ln: accessing `.test': Permission denied Now I can't unlink or delete the symlink file. Tried Googling for help but could not find a solution. Please find the results of following commands. stat .test : File: `.test'stat: cannot read symbolic link `.test': Permission denied Size: 26 Blocks: 0 IO Block: 16384 symbolic link Device: 1fh/31d Inode: 312075453 Links: 1 Access: (0777/lrwxrwxrwx) Uid: (11160/ chatt) Gid: (11307/ pgr) Access: 2012-11-12 11:36:51.167327500 +0000 Modify: 2012-11-12 11:36:51.163331700 +0000 Change: 2012-11-12 11:36:51.163331700 +0000 Birth: - chattr -i .test: chattr: Permission denied while trying to stat .test lsatter .test lsattr: Operation not supported While reading flags on .test Any help would be appreciated. Thanks

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• Cannot connect to internet with Clearwire modem

  - by ide

  I'm currently using a Motorola WiMAX modem (CPEi 25725) and cannot connect to the internet. I can connect to the modem at 192.168.15.1 and check its status. It says that it has good/excellent connectivity to the internet and shows all five signal bars. Additionally it has sent and received some WiMAX packets so I believe it is connected to a tower. I'm at a loss for what the problem is. Unplugging the modem, restarting it from software, and restarting my computer (Windows 7) have not helped. Windows still reports that it is not connected to the internet. Alternatively, could this be an ISP issue? I have heard that Clearwire is a not-so-reputable ISP that blocks VoIP, and I was using Skype recently. EDIT: I called Clear's tech support and apparently their network is having significant problems at the moment. Guess there's nothing an end-user can do about it.

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• Tomcat and HTTPS connect timeout (local Proxy resolves it)

  - by smas

  I have web application on the Tomcat with webservices. I've noticed that all web services connected to https get timeout. I run this app on my localhost in my company. When I redirect all my connections through Fiddler (local proxy) everything works correctly. I don't want to execute fiddler all the time. my computer -> [FIDDLER local proxy] -> [remote proxy] // WORKS my computer -> [remote proxy] // timeout How to increase tomcat logging to get more technical logs than only "timeout". Is there any other way to get more information what blocks the https URL?

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• SMTP redirecting to other port than 25

  - by Roalt

  How can you redirect your smtp traffic to another port than 25? My ISP blocks incoming traffic to port 25. I've been using ZoneEdit.com for this purpose for years (incoming mail traffic goes to another port and I redirect it via my firewall internally to port 25), but with the new system I cannot do it anymore. I'm not sure if I can do this by configuring MX and A records in the right way or if I need a SMTP redirecting service (such as rollernet.us)? I'm not an expert in Zone records but generally I know my way around for website traffic.

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• Enlarge partition on SD card

  - by chenwj

  I have followed Cloning an SD card onto a larger SD card to clone a 2G SD card to a 32G SD card, and the file system is ext4. However, on the 32G SD card I only can see 2G space available. Is there a way to maximize it out? Here is the output of fdisk: Command (m for help): p Disk /dev/sdb: 32.0 GB, 32026656768 bytes 64 heads, 32 sectors/track, 30543 cylinders, total 62552064 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000e015a Device Boot Start End Blocks Id System /dev/sdb1 * 32 147455 73712 c W95 FAT32 (LBA) /dev/sdb2 147456 3994623 1923584 83 Linux I want to make /dev/sdb2 use up the remaining space. I try resize2fs /dev/sdb after dd, but get message below: $ sudo resize2fs /dev/sdb resize2fs 1.42 (29-Nov-2011) resize2fs: Bad magic number in super-block while trying to open /dev/sdb Couldn't find valid filesystem superblock. Any idea on what I am doing wrong? Thanks.

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• Unreadable sectors reported by smartd, is it serious?

  - by stribika

  I have a RAID 5 array of 4 disks. In the last 2 days I began to see these messages in the log: Jun 13 23:01:05 localhost smartd[4537]: Device: /dev/sda [SAT], 1 Currently unreadable (pending) sectors Jun 13 23:01:05 localhost smartd[4537]: Device: /dev/sdb [SAT], 2 Currently unreadable (pending) sectors If I have 2 faulty disks then the array should not show all disks OK: md0 : active raid1 sdd1[3] sdb1[1] sdc1[2] sda1[0] 64128 blocks [4/4] [UUUU] Strangely there are no other problems just the log messages. I am worried because sda is new and I previously had problems with sdb. (Completely died but the guy who sold it to me fixed it somehow.) Am I in danger of losing data? What should I do now?

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• Selectively routing traffic via ethernet or wifi, with proper DNS (Mac OS X 10.6)

  - by Dan

  When I'm at work, I access various intranet pages as well as the wider Internet through ethernet. However, the company LAN blocks some ports (e.g. Google Calendar). I can get to those through WiFi. So, I gave the Airport priority, and then using route add, I set up selective routing: all intranet traffic goes through the ethernet and everything else via WiFi: sudo route add 10.0.0.0/8 <intranet gateway>. However, there are a number of intranet sites that have their own DNS; i.e., hr.company.com only resolves on the intranet. The only way that I can get the DNS to work properly is to add the internal DNS server to the Airport DNS listing, however I fear that when I go elsewhere and forget, this will break things. What's the right way to get the DNS to resolve using this setup?

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• Can NFS be forced to refresh stale files/directories when not using noac on the mount?

  - by johnnycrash

  We mount without using noac. I have a file that I append to once every 20 minutes. Then it will be read with mmap about 5,000 times a minute. We only mmap a couple blocks for each read. Needless to say, noac just kills the access performance, so we don't use it. I add data to the end of the file using a mount with noac and read from a mount without noac. The mounts that are reading are not seeing the new data. I want to know if there is a function I can call from c to refresh the attributes of a path and all its files. EDIT: I should add we cannot mount and unmount since there are 16 servers running on each system and they are constantly accessing the files. Well...maybe we could mount and unmount if each server used their own mount. I'd like to avoid that if possible. thanks!

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• Apache2: How do I restrict access to a directory, but allow access to one file within it?

  - by Nick

  I've inherited a poorly designed web app, which has a certain file that needs to be publicly accessible, but that file is inside a directory which should not. In other words, I need a way to block all files and sub-directories within a directory, but over-ride it for a single file. I'm trying this: # No one needs to access this directly <Directory /var/www/DangerousDirectory/> Order Deny,allow Deny from all # But this file is OK: <Files /var/www/DangerousDirectory/SafeFile.html> Allow from all </Files> </Directory> But it's not working- it just blocks everything including the file I want to allow. Any suggestions?

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• two shops network

  - by edward

  okay so, I just opened up two shops in my hometown. The two stores is about 6 blocks apart, connecting them by wire is not really feasible in cost wise. What kind of network topology should I use for my small shops, there will be 5 computers, one is the sales computer ,another 4 as mentioned is the guest computer. I want the sales and guest computers network to be seperated. Both shops have same computers. The guest computers serves up simple website that has my shop catalog on it, I'm thinking of using a web server. So, how am i suppose to setup these networks, im planning to add in more computers in the future. Is it I need to station a single server at a shop, and all the computer connected to it? or is there any more effective methods? I'm no networking expert, would love to hear some advice.

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• Asus Z8NA-D6, not powering up/no signal for monitor

  - by s093294

  I have a Asus Z8NA-D6 motherboard. Been running fine so far with one E5504 Xeon processor. I have added another Xeon E5504 CPU to the second slot and it will not power up (or there is no signal to the monitor). The status lights turn on as normal. no error led. Nothing happens other then the leds start and both cpus/fans power up. HDD power up. I tried clearing CMOS. Any sugestions? http://www.asus.com/Server_Workstation/Server_Motherboards/Z8NAD6/#download Update. Removing ram for second cpu makes it boot atleast. itboots with memory pluged in for cpu 1. (2 4gb modules) when addin one more to the second cpu it still boots but bios only see the 2 blocks at cpu 1)

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• Is there a way to create a copy-on-write copy of a directory?

  - by BCS

  I'm thinking of a situation where I would have something that creates a copy of a directory, tweaks a few files, and then does some processing on the result. This wold be done fairly often, maybe a few dozen times a day. (The exact use case is testing patch submissions; dupe the code, patch it, build/test/report/etc.) What I'm looking for could be done by creating a new directory structure and populating it with hard links from the origonal. However this only works if all the tools you use delete and recreate files rather than edit them in place. Is there a way to have the file system do copy-on-write for a file? Note: I'm aware that many FSs use COW at a block level (all updates are done via writes to new blocks) but this is not what I want.

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• node.js server not running

  - by CMDadabo

  I am trying to learn node.js, but I'm having trouble getting the simple server to run on localhost:8888. Here is the code for server.js: var http = require("http"); http.createServer(function(request, response) { response.writeHead(200, {"Content-Type": "text/plain"}); response.write("Hello World"); response.end(); }).listen(8888); server.js runs without errors, and trying netstat -an | grep 8888 from terminal returns tcp4 0 0 *.8888 *.* LISTEN However, when I go to localhost:8888 in a browser, it says that it cannot be found. I've looked at all the related questions, and nothing has worked so far. I've tried different ports, etc. I know that my router blocks incoming traffic on port 8888, but shouldn't that not matter if I'm trying to access it locally? I've run tomcat servers on this port before, for example. Thanks so much for your help! node.js version: v0.6.15 OS: Mac OS 10.6.8

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• VPC on Windows 7 very slow network

  - by Shigg

  I have a Windows 2003 virtual machine which I use for website testing. I've just installed Windows 7 and am using the new version VPC (not xp mode). When I try to copy a file - I need to copy some big databases across - I get a file copy speed of about 20k per sec. Copying from one PC to another on the real network transfers files at 13mb per second. Any ideas what may be causing this? I've turned off differential network compression on win 7. The Virtual HD is on a seperate physical drive to the OS. Running Windows 7 64 bit on a dual xeon with 16gb ram and 10,000 rpm drives. Tried installing VPC 2007 but windows blocks it running saying its not compatable. Many thanks for any ideas.

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• Windows Firewall 2008 Server - Allow only given IP in, block all others

  - by chumad

  I've got a Windows 2008 Server. It has the built-in windows firewall on it. I've played around with the Advanced settings where I can setup inbound/outbound rules, but it doesn't appear that I can create a rule that would say "Block All incoming traffic except traffic coming from this IP address" I created a rule that Blocks All, but there's no way that I've found to create a rule that will "override" the block rule and allow 1 or more IP's to get in. I accomplished this on a Win2k box using IPSEC, but it seems that IPSEC is now built-in to windows firewall. Any tips?

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• Accessing a broken mdadm raid

  - by CarstenCarsten

  Hi! I used a western digital mybookworld (SOHO NAS storage using Linux) as backup for my Linux box. Suddenly, the mybookworld does not boot up any more. So I opened the box, removed the hard disk and put the hard disk into an external USB HDD case, and connected it to my Linux box. [ 530.640301] usb 2-1: new high speed USB device using ehci_hcd and address 3 [ 530.797630] scsi7 : usb-storage 2-1:1.0 [ 531.794844] scsi 7:0:0:0: Direct-Access WDC WD75 00AAKS-00RBA0 PQ: 0 ANSI: 2 [ 531.796490] sd 7:0:0:0: Attached scsi generic sg3 type 0 [ 531.797966] sd 7:0:0:0: [sdc] 1465149168 512-byte logical blocks: (750 GB/698 GiB) [ 531.800317] sd 7:0:0:0: [sdc] Write Protect is off [ 531.800327] sd 7:0:0:0: [sdc] Mode Sense: 38 00 00 00 [ 531.800333] sd 7:0:0:0: [sdc] Assuming drive cache: write through [ 531.803821] sd 7:0:0:0: [sdc] Assuming drive cache: write through [ 531.803836] sdc: sdc1 sdc2 sdc3 sdc4 [ 531.815831] sd 7:0:0:0: [sdc] Assuming drive cache: write through [ 531.815842] sd 7:0:0:0: [sdc] Attached SCSI disk The dmesg output looks normal, but I was wondering why the hardisk was not mounted at all. And why there are 4 different partitions on it. fdisk showed the following: root@ubuntu:/home/ubuntu# fdisk /dev/sdc WARNING: DOS-compatible mode is deprecated. It's strongly recommended to switch off the mode (command 'c') and change display units to sectors (command 'u'). Command (m for help): p Disk /dev/sdc: 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: 0x00007c00 Device Boot Start End Blocks Id System /dev/sdc1 4 369 2939895 fd Linux raid autodetect /dev/sdc2 370 382 104422+ fd Linux raid autodetect /dev/sdc3 383 505 987997+ fd Linux raid autodetect /dev/sdc4 506 91201 728515620 fd Linux raid autodetect Oh no! Everything seems to be created as a mdadm software raid. Calling mdadm --examine with the different partitions seems to affirm that. I think the only partition I am interested in, is /dev/sdc4 (because it is the largest). But nevertheless I called mdadm --examine with every partition. root@ubuntu:/home/ubuntu# mdadm --examine /dev/sdc1 /dev/sdc1: Magic : a92b4efc Version : 00.90.00 UUID : 5626a2d8:070ad992:ef1c8d24:cd8e13e4 Creation Time : Wed Feb 20 00:57:49 2002 Raid Level : raid1 Used Dev Size : 2939776 (2.80 GiB 3.01 GB) Array Size : 2939776 (2.80 GiB 3.01 GB) Raid Devices : 2 Total Devices : 1 Preferred Minor : 1 Update Time : Sun Nov 21 11:05:27 2010 State : clean Active Devices : 1 Working Devices : 1 Failed Devices : 1 Spare Devices : 0 Checksum : 4c90bc55 - correct Events : 16682 Number Major Minor RaidDevice State this 0 8 1 0 active sync /dev/sda1 0 0 8 1 0 active sync /dev/sda1 1 1 0 0 1 faulty removed root@ubuntu:/home/ubuntu# mdadm --examine /dev/sdc2 /dev/sdc2: Magic : a92b4efc Version : 00.90.00 UUID : 9734b3ee:2d5af206:05fe3413:585f7f26 Creation Time : Wed Feb 20 00:57:54 2002 Raid Level : raid1 Used Dev Size : 104320 (101.89 MiB 106.82 MB) Array Size : 104320 (101.89 MiB 106.82 MB) Raid Devices : 2 Total Devices : 1 Preferred Minor : 2 Update Time : Wed Oct 27 20:19:08 2010 State : clean Active Devices : 1 Working Devices : 1 Failed Devices : 1 Spare Devices : 0 Checksum : 55560b40 - correct Events : 9884 Number Major Minor RaidDevice State this 0 8 2 0 active sync /dev/sda2 0 0 8 2 0 active sync /dev/sda2 1 1 0 0 1 faulty removed root@ubuntu:/home/ubuntu# mdadm --examine /dev/sdc3 /dev/sdc3: Magic : a92b4efc Version : 00.90.00 UUID : 08f30b4f:91cca15d:2332bfef:48e67824 Creation Time : Wed Feb 20 00:57:54 2002 Raid Level : raid1 Used Dev Size : 987904 (964.91 MiB 1011.61 MB) Array Size : 987904 (964.91 MiB 1011.61 MB) Raid Devices : 2 Total Devices : 1 Preferred Minor : 3 Update Time : Sun Nov 21 11:05:27 2010 State : clean Active Devices : 1 Working Devices : 1 Failed Devices : 1 Spare Devices : 0 Checksum : 39717874 - correct Events : 73678 Number Major Minor RaidDevice State this 0 8 3 0 active sync 0 0 8 3 0 active sync 1 1 0 0 1 faulty removed root@ubuntu:/home/ubuntu# mdadm --examine /dev/sdc4 /dev/sdc4: Magic : a92b4efc Version : 00.90.00 UUID : febb75ca:e9d1ce18:f14cc006:f759419a Creation Time : Wed Feb 20 00:57:55 2002 Raid Level : raid1 Used Dev Size : 728515520 (694.77 GiB 746.00 GB) Array Size : 728515520 (694.77 GiB 746.00 GB) Raid Devices : 2 Total Devices : 1 Preferred Minor : 4 Update Time : Sun Nov 21 11:05:27 2010 State : clean Active Devices : 1 Working Devices : 1 Failed Devices : 1 Spare Devices : 0 Checksum : 2f36a392 - correct Events : 519320 Number Major Minor RaidDevice State this 0 8 4 0 active sync 0 0 8 4 0 active sync 1 1 0 0 1 faulty removed If I read the output correctly everything was removed, because it was faulty. Is there ANY way to see the contents of the largest partition? Or seeing somehow which files are broken? I see that everything is raid1 which is only mirroring, so this should be a normal partition. I am anxious to do anything with mdadm, in fear that I destroy the data on the hard disk. I would be very thankful for any help.

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• local wordpress installation not accessible from the outside world

  - by hello

  I have a working installation of wordpress located in /var/www/html/wordpress It is accessible in my local network at [local-machine-ip]/wordpress/ There is also a test page located in /var/www/html/test.html It is also accessible in my local network at [local-machine-ip] I would like the wordpress website to be accessible from the outside world. I know that my ISP blocks incoming requests on port 80, so I set my router to redirect requests from port 8080 to 80. This feature appears to be working correctly since I can access the test.html page using my public ip address as follows: [public-ip]:8080 However, I cannot access [public-ip]:8080/wordpress Here is my Apache config : <VirtualHost *:80> ServerAdmin webmaster@localhost DocumentRoot /var/www/html ServerName [my.domain.com] <Directory /var/www/html/> Options FollowSymLinks Indexes MultiViews AllowOverride All Order allow,deny allow from all </Directory> ErrorLog ${APACHE_LOG_DIR}/error.log CustomLog ${APACHE_LOG_DIR}/access.log combined </VirtualHost> Thanks!

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