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• How can I optimize my ajax calls to deliver at 60ms.

  - by Quintin Par

  I am building an autocomplete functionality for my site and the Google instant results are my benchmark. When I look at Google, the 50-60 ms response time baffle me. They look insane. In comparison here’s how mine looks like. To give you an idea my results are cached on the load balancer and served from a machine that has httpd slowstart and initcwnd fixed. My site is also behind cloudflare From a server side perspective I don’t think I can do anything more. Can someone help me take this 500 ms response time to 60ms? What more should I be doing to achieve Google level performance? Edit: People, you seemed to be angry that I did a comparison to Google and the question is very generic. Sorry about that. To rephrase: How can I bring down response time from 500 ms to 60 ms provided my server response time is just a fraction of ms. Assume the results are served from Nginx - Varnish with a cache hit. Here are some answers I would like to answer myself assume the response sizes remained more or less the same. Ensure results are http compressed Ensure SPDY if you are on https Ensure you have initcwnd set to 10 and disable slow start on linux machines. Etc. I don’t think I’ll end up with 60 ms at Google level but your collective expertise can help easily shave off a 100 ms and that’s a big win.

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• Partitioning of Ubuntu server which will use OpenVZ and encrypted partitions (unlocked through SSH l

  - by DeletedAccount

  Hi, I'm about to install a server. Some context: My HDD is 1 TB and I have 2 GB RAM Ubuntu Server Lucid Lynx AMD 64 I will use OpenVZ and have most functionality separated into containers. To support disk quotas I need to use ext3 (not ext4) for the container partition. Each time I reboot the server I want to be forced to login through SSH and mount the encrypted partitions by typing my password (if someone steals the server, no critical data should be available). I want to have as much as possible encrypted. Yet I want to be able to login through SSH as I don't have a monitor or keyboard at the server. I am not sure how big I need my partitions to be. Being able to resize them later would be nice. I guess it implies using LVM? But the manual partition mount using SSH is also very important (in fact it's more important, if I have to pick one). How do you recommend that I partition the HDD? If I have daemons which needs the encrypted partitions, will they fail and can I just restart them after mounting the needed partitions?

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• Same script, different behavior [migrated]

  - by Antoine_935

  I just stumbled upon an interesting bug... Still trying to figure out what is exactly happening. Maybe you can help. First, the context. I'm currently building yet another man to html converter (for some reasons I won't motivate here, but I need it). So, have a look at the screenshot below (see the link), more precisely at the outlined spots. See? On the upper shell, I have &lt ; and &gt ;, that is, escaped html. While on the shell below I have < and directly. But as you can see (or do I seriously need looking glass ?), the command man 2 semget | webmanneris the same on both sides, as is the which webmanner. The two are executed roughly at the same moment, with no modification made to the script between. [Oops, cannot post pictures just yet... Here comes the link] http://aspyct.org/media/webmanner-bug.png But the shell below is older (open about 1 hour ago). Newer shells all print out &lt ;. So my first guess was that it somehow had a cached reference to the old inode of the file, or old blocks or whatever. So I modified parts of the script, at the start and then at the end, to print different messages. And, surprise, the message shown up on both terminals. But still, same difference between &lt ; and <. I'm confused... How to explain that behavior? I'm working on a OSX 10.8 (Mountain Lion) EDIT: OK, there is one big difference: the shell below uses ruby 1.9.3, while above is 1.8.7. Is there any known difference in string handling between the two versions ?

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• Vim move cursor one character in insert mode without arrow keys

  - by bolov

  This might seem a little too overboard, but I switched to vim and I so happy about the workflow now. I try to discipline myself not to use the arrow keys, as keeping the hands on the alfa-keys all the time is such a big thing when writing. So when I need to navigate I get out of insert mode, move in normal mode and get back in insert mode. There is an exception where this is actually more disrupting: I use clang complete with snippets and super tab which is great. Except every time I get a function auto completed after I fill in the parameters I am left with the cursor before ) so to continue I have to move the cursor one character to the right. As you can imagine this happens very often. The only options I have (as far as I know) are : Escla or ?, and I am not happy about neither of them. The first one makes me hit 3 keys for just a simple 1 character cursor move, the second one makes me move my hand to the arrow keys. A third option would be to map CTRL-L or smth to ?. So what is the best way of doing this? //snippets (clang complete + supertab): foo($`param1`, $`param2`) //after completion: foo(var1, var2|) ^ ^ | | I am here | Need to be here | denotes cursor position

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• Wires from fan on side panel - where do they connect?

  - by Mick

  The side panel of my desktop PC has a small fan built in. There were two wires, one red one black that connected inside the PC. Unfortunately I had the bolts removed and the side door fell off ripping the cables such that the main length of cable remains attached to the fan. So there must be two short stubs of broken cable somewhere - but I can't find them! Any ideas where I should look? I can't see anything on the motherboard. the PC is running perfectly well - but I now have the side open to make sure the air can circulate. EDIT: The motherboard appears to be an "Asus P6T SE" EDIT: The manual shows the location of two "chassis fan" connectors. One is being used by a big chassis fan on the back face of the PC (underneath the pwer supply). The other appears to be unused - there is no stub of a connector with wires - its just the bare pins sticking directly out of the motherboard. There is also an unused "pwr_fan" connector. Would it be ok to simply connect the black and red wires from the fan to the black and red parts of a molex adapter?

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• Have some questions about setting up a VPN to my private cloud servers

  - by Pure.Krome

  I've got a number of Virtual Servers running at a pretty big Cloud provider. They are all running Windows 2008 R2. I have a CISCO ASA firewall in front of them. Currently, I've got all ports blocked except 80/443/21/3386 (for Remote Desktop). I asked to have a VPN enabled on the firewall and they said it's easy to do BUT I need to use the 3rd party Cisco software. Now, I don't want to get into a debate about it .. but we don't want to install anything extra on our -client- computers. We all use Windows 7 and we love using the built in VPN client to connect to other private LANS we have setup in other locations. So i'm wondering what options I have to create a VPN tunnel to our private cloud LAN? All our cloud servers are part of WORKGROUP, so there's no Active Directory .. nor do we want to install all that. Secondly, we know we can open up a firewall port - so any ports for starting a VPN is fine! Lastly, I was thinking of just using one of the existing servers as the VPN server (and using the Windows VPN software) .. but I'm not sure this is a good thing? Remember - we just want to use the baked in VPN software in Windows 7 .. which is PPTP or SSTP or L2TP/IPSEC. I would -LOVE- to use some free OSS software. For usernames/passwords? We'd probably just have one account .. like U:Hithere P:whatever.. so we don't need any hardcore account management, like Active Directory, etc. So does anyone have any ideas?

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• Let varnish send old data from cache while it's fetching a new one?

  - by mark

  I'm caching dynamically generated pages (PHP-FPM, NGINX) and have varnish in front of them, this works very well. However, once the cache timeout is reached, I see this: new client requests page varnish recognizes the cache timeout client waits varnish fetches new page from backend varnish delivers new page to the client (and has page cached, too, for the next request which gets it instantly) What I would like to do is: client requests page varnish recognizes the timeout varnish delivers old page to the client varnish fetches new page from backend and puts it into the cache In my case it's not site where outdated information is such a big problem, especially not when we're talking about cache timeout from a few minutes. However, I don't want punish user to wait in line and rather deliver something immediate. Is that possible in some way? To illustrate, here's a sample output of running siege 5 minutes against my server which was configured to cache for one minute: HTTP/1.1,200, 1.97, 12710,/,1,2013-06-24 00:21:06 ... HTTP/1.1,200, 1.88, 12710,/,1,2013-06-24 00:21:20 ... HTTP/1.1,200, 1.93, 12710,/,1,2013-06-24 00:22:08 ... HTTP/1.1,200, 1.89, 12710,/,1,2013-06-24 00:22:22 ... HTTP/1.1,200, 1.94, 12710,/,1,2013-06-24 00:23:10 ... HTTP/1.1,200, 1.91, 12709,/,1,2013-06-24 00:23:23 ... HTTP/1.1,200, 1.93, 12710,/,1,2013-06-24 00:24:12 ... I left out the hundreds of requests running in 0.02 or so. But it still concerns me that there are going to be users having to wait almost 2 seconds for their raw HTML. Can't we do any better here? (I came across Varnish send while cache , it sounded similar but not exactly what I'm trying to do.)

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• Server specification recommendation

  - by foo

  To cut the story short, I can't buy an item (server/cpu/motherboard/ram) that costs more than USD 330. However, I can combine them, meaning, I can buy a CPU that costs USD 330 and motherboard that costs USD 330. With this limitation, I can't buy a powerful 1U server which will definitely costs me more USD 330. With that in mind, I was hoping to build a powerful desktop PC which will be used as a database server. However, through my experience, desktop PC doesn't last very long, usually the motherboard will just die by itself after 1 or 2 years. So, what would you guys recommend me to buy with this kind of budget? Every item must be <= USD 330. Will be used as a MySQL server. RAID would be nice. 1TB is pretty big for my data. I do not need external graphic card (onboard would do just fine), mouse, keyboard, monitor. Linux friendly. One ethernet port is good enough. It's important that those hardware is made of components that will last long (at least 3 years or something). The server will be placed in an air conditioned room, but a good ventilation for the server is always preferred. I won't overclock it. Intel processor is preferred. Thanks in advance.

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• FDE / SSD - partition and leave some unencrypted?

  - by Web Design Hero

  Just bought a used beast of a desktop pc. The system drive is setup as a Raid 0 SSD (Intel 510 SSD Drives) with 128 each. I will probably not have to many programs beyond office and maybe Adobe CS if I spring for it, I will be keeping big data on a regular hdd. My question is about setting up TrueCrypt with my configuration. I have not previously done full disk encryption, but I feel that its probably a good idea. I have done some speed tests using file containers on the hdd and the sdd with truecrypt. While there is a huge hit with the SSDs and Truecrypt, it still outperforms the hdd on its own by a good margin, so I think i will be okay for my needs with truecrypt. I have seen in a few places that they recommend partitioning the drive and leavign some of the SSD not inside truecrypt, does this really make a difference? If so, how much should I leave? Will there be any issue in the Raid0 configuration? I am not really concerned about all the wear leveling issue, rather loose data and be secure, but since I don't need all that space neccesarily, I would like to optimize my setup for security and speed.

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• SQL Server 2012 memory usage steadily growing

  - by pgmo

  I am very worried about the SQL Server 2012 Express instance on which my database is running: the SQL Server process memory usage is growing steadily (1.5GB after only 2 days working). The database is made of seven tables, each having a bigint primary key (Identity) and at least one non-unique index with some included columns to serve the majority of incoming queries. An external application is calling via Microsoft OLE DB some stored procedures, each of which do some calculations using intermediate temporary tables and/or table variables and finally do an upsert (UPDATE....IF @@ROWCOUNT=0 INSERT.....) - I never DROP those temporary tables explicitly: the frequency of those calls is about 100 calls every 5 seconds (I saw that the DLL used by the external application open a connection to SQL Server, do the call and then close the connection for each and every call). The database files are organized in only one filgegroup, recovery type is set to simple. Some questions to diagnose the problem: is that steadily growing memory normal? did I do any mistake in database design which probably lead to this behaviour? (no explicit temp-table drop, filegroup organization, etc) can SQL Server manage such a stored procedure call rate (100 calls every 5 seconds, i.e. 100 upsert every 5 seconds, beyond intermediate calculations)? do the continuous "open connection/do sp call/close connection" pattern disturb SQL Server? is it possible to diagnose what is causing such a memory usage? Perhaps queues of wating requests? (I ran sp_who2, but I didn't see a big amount of orphan connections from the external application) if I restrict the amount of memory which SQL Server is allowed to use, may I sooner or later get into trouble?

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• 2 Web Servers, 2 Domains, 1 WAN IP configuration

  - by Tillman32

  The Problem: I have 2 domains, 2 web servers, 1 WAN IP. This is on a home network, so I don't have any crazy router or anything with the right tools, at least I don't think I do. I have a Dlink DIR-655 router. I need to be able to forward the website to the right box. 1 server is hosting www.site1.com, and the other should be hosting, www.site2.com. I forwarded the domain, to a port that is forwarded to that box. wanip:1235, 1235 is then forwarded to the internal IP of site2's server. But when I go to www.site2.com I get the 404 page of www.site1.com. I need www.site2.com to go to the right server. Is this something I can do in the virtual hosts of www.site1.com or is it something else. Also, if this isn't entirely possible, or if its a big process, I can just move www.site1.com to the www.site2.com's server, and use virtual hosts, that is an option that I would be okay with.

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• Different font SIZES in a Text Editor, based on Script(Alphabet) type (ie. per Unicode Code-Block)

  - by fred.bear

  Some non-Latin-based scripts(alphabets) have more detail in their glyphs than do the Latin-based-script equivalents, and typically need a larger font to give the same degree of legibility (resolution-wise). Sometimes, both script types need to be present in the same file. Notepad++ allows different font SIZES (and colour, etc) courtesy of syntax-highlighting. This allows me to display larger-fonted non-Latin-based script in a // BIG-FONT comment. Although this has been quite handy for me in some situations, it is quite limited. A Word Processor can handle this scenario, but I'm not interested in that. I want a nice simple(?) plain(?) Text Editor to do it... on a per script-type basis... eg. mixing Latin-1 and Devanagari (and Mandarin, and ... Such a thing may not exits, but Notepad++ has shown that a simple(?) plain(?) Text Editor is capable of it. Does anyone know of such a Text Editor? ...Q. Why not a Word Processor? ...A. Because GCC and Python don't like that format! but UTF-8 is fine.

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• Things to consider when building a continuous integration server?

  - by Dave

  I'm new to continuous integration, but immediately realize its value, and I want to get one set up right away. I have played with TeamCity and have it working in a VM great. Now, I don't want to spend money on another system, so I was planning on just doing the VM again on a faster machine (i.e. my dev system). There are a few questions that come to mind with this: Hard disk allocation - how big should it be? Sure, 60GB seems like more than enough, but people also used to think that we'd never need more than 64KB of RAM Backups - is it even important to back up the integration server? Sure, I guess it's nice so that one doesn't have to go through the entire configuration process again, but I would think that's about it. I could snapshot my VM every time I do a configuration change, and then do a backup of applications only (ignore the buildAgent stuff). Migration - if I want to go away from a VM on my dev system, to a new server, which maybe even runs Windows Server 2003, is it easy enough? Perhaps this is a particular point best suited for StackOverflow.

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• USB Hub vs. Dockinstation USB vs. Laptop USB

  - by Will

  I recently had thougts about my current setup in my office, especially about the UBS ports distribution. Here's my setup: I have a Lenovo T410 docked to a Lenovo Dockingstation Series 3, that providey me with 6 USB ports, which I use all (3 ext. drives, mouse, keyboard, USB Hub of monitor). The USB hub on my ext. monitor (most probably powered by the ext. monitor's power supply) provides me with 2 USB ports, where I use one for my webcam and another for USB sticks. On my T410 itself I have 4 USB slots, that are usually not used, as don't want to mess with USB plugs when undocking my laptop, now and then I plug my printer on one of these, just because I don't have any UBS ports left. Now I'm wondering how fast each of these slots are: I assume that all the 6 USB ports from the dockinstation somehow go through the docking connector on the bottom of my laptop. Does this connector has such a big bandwidth for all these 6 USB ports to perform like if they were dedicated ports as the 4 ones on my laptop? Also how is generally the performance of USB hubs (like the one on my ext. monitor?)?

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• where is my disk space?

  - by user166241

  I recently had a problem with .xsession-errors file - it became very big ( 90GB) and took all disk space: How I can check what takes disk space in /tmp?. I cleaned it with command > .xsession-errors but after an hour it became large again. So I deleted it (rm .xsession-errors) - it helped because it wasn't recreated but again after hour disk space disappeared - now there is no .xsession-errors anymore but I don't know where is the memory: df Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda1 106640456 101223392 4 100% / udev 8166744 8 8166736 1% /dev tmpfs 3270224 972 3269252 1% /run none 5120 0 5120 0% /run/lock none 8175552 152 8175400 1% /run/shm du -sc * .[^.]* | sort -n 0 initrd.img 0 initrd.img.old 0 proc 0 sys 0 vmlinuz 0 vmlinuz.old 4 cdrom 4 lib64 4 media 4 mnt 4 selinux 8 dev 12 srv 16 lost+found 68 tmp 1124 run 3396 lib32 5164 .rpmdb 5540 root 8888 sbin 9120 bin 17132 etc 106080 opt 116956 boot 861908 lib 3530584 usr 3821836 var 13371260 home 21859112 total So there is around 100GB used but executing du -sc * .[^.]* | sort -n in root directory finds only ~21 GB - so what takes 80GB?? How to check it? I suspect that when I deleted the `.xsession-errors' file the errors were redirected somwhere else - but where?

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• NGINX + PHP-FPM - Strange issue when trying to display images via php-gd / readfile - Connection wont terminate

  - by anonymous-one

  Ok, to get the details out of the way: The php script can be anything as simple as: <? header('Content-Type: image/jpeg'); readfile('/local/image.jpg'); ?> When I try to execute this via nginx + php-fpm what happens is the image shows up in the browser, here is what happens: IE - The page stays blank for a long period of time, and eventually the image is shown. Chrome - The image shows, but the loading spinner spins and spins for a long period of time. Eventually the debugger will show the image in red as in error, but the image shows up fine. Everything else on the server works great. Its pushing out about 100mbit steady serving static content. So this is definatly a php-fpm related issue. I THINK this may have something to do with the chunked encoding being sent back wrong? Also, I threw in a pause before the image was read, and got the pid of the fpm process, and it looks as tho its terminatly correctly (from strace): shutdown(3, 1 /* send */) = 0 recvfrom(3, "\1\5\0\1\0\0\0\0", 8, 0, NULL, NULL) = 8 recvfrom(3, "", 8, 0, NULL, NULL) = 0 close(3) = 0 The above was dumped long before ie/chrome decided to give up (even tho the image was shown) loading the image. Displaying HTML / text content is fine. Big bodies etc all load nice and fast and terminate right away (as they should). Doing something like: THIS IS THE IMAGE ---BINARY DUMP OF IMAGE--- Works fine too. Any ideas?

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• Rsync root files between systems without specifying password

  - by xpt

  This seems very tricky to me. I've set up my two systems so that I can rsync files between them as me, without specifying password. Now the the problem is to rsync files that belong to root. On both of my systems, there are no root passwords. The only way to become root is via sudo. So I can neither give a password for sudo rsyn local root@remote:, no use my ssh-agent to supply pass phrase. I don't want to set up a root password on any systems; and I do need the files to be owned by root on both systems. EDIT: Using the files that belong to root is just an example, I need a way for my unprivileged account to read/write system (including root-owned) files easily. One example is to copy my configured /root environment into the freshly-installed system. The two systems are actually two VMs under a single host, so it's not a big concern for me to copy root-owned files between them. EDIT 2: If I only want to copy my configured /root environment into the freshly-installed system, I can use tar: sudo tar cvzf - /root | ssh me@remote sudo tar xvzf - -C / But I do need rsync to update from time to time. Any easy way to make it happen? EDIT 3: Formally formulate the question Alright, it all began with the question, how to rsync files that belong to root between two systems as a normal unprivileged user, without specifying password, under the condition that, The root account is locked on both of systems. I.e., there are no root passwords. The only way to become root is via sudo (recommended security practice, see http://help.ubuntu.com/community/RootSudo) I don't want a completely passwordless sudo but don’t want to be typing passwords all the time either. The normal unprivileged user has entered their ssh pass phrase into the ssh agent. Thanks

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• Non-volatile cache RAID controllers: what kind of protection is there against NVCACHE failure?

  - by astrostl

  The battery back-up (BBU) model: admin enables write-back cache with BBU writes are cached to the RAID controller's RAM (major performance benefit) the battery saves uncommitted and cached data in the event of a power loss (reliability) If I lose power and come back within a day or so, my data should be both complete and uncorrupted. The downside to this is that, if the battery is dead or low, OR EVEN IF IT IS IN A RELEARN CYCLE (drain/charge loops to ensure the battery's health), the controller reverts to write-through mode and performance will suffer. What's more, the relearn cycles are usually automated on a schedule which may or may not happen in the middle of big traffic. So, that has to be manually disabled and manually scheduled for off-hours if it's a concern. Annoying either way. NV caches have capacitors with a sufficient charge to commit any uncommitted-to-disk data to flash. Not only is that more survivable in longer loss situations, but you don't have to concern yourself with battery death, wear-out, or relearning. All of that sounds great to me. What doesn't sound great to me is the prospect of that flash module having an issue, though. What if it's completely hosed? What if it's only partially hosed? A bit corrupted at the edges? Relearn cycles can tell when something like a simple battery is failing, but is there a similar process to verify that the flash is functional? I'm just far more trusting of a battery, warts and all. I know the card's RAM can fail, the card itself can fail - that's common territory, though. In case you didn't guess, yeah, I've experienced a shocking-to-me amount of flash/SSD/etc. failure :)

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• Server down at 23:26 every night

  - by miccet

  We are having a big problem with our sites stability the last couple of weeks and after endless hours of troubleshooting I don't get anywhere. So I turn to you dear community. Setup: 2 x VPS servers - Front end, 8 core, 8G RAM. - Database, 5 core, 3G RAM. Both running Ubuntu. Ruby on Rails EE with Passenger 3 and Rails 2.3.11. MySQL 5.1.67. The problem is that each night, at the exact same time (23:26) the SQL server suddenly shows a processlist full of COMMIT with an increasing Time. After 30-40 seconds (can go longer) a wave seems processed and the site responds for a few seconds before it repeats. During this hick up the database server load spikes while the front end is relaxing. I have looked at slow queries, but is not finding any locks or other unusual queries ran at this time. I have looked at iotop at the time of the halt and there is no activity from mysql. I also tried turning off query_cache and messed around with the mysql configuration file without much change. Any ideas?

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• How can I undo what I did when I accidentally booted linux host inside itself with VMware?

  - by ThomasGHenry

  Hello, I'm dual booting XP and Kubuntu. I wanted to boot to my existing raw scsi XP partition inside Kubuntu, not a virtual XP instance. I accidentally booted Kubuntu inside itself. I know this is a big mistake, so I interrupted the VM, which saved the state and closed. I rebooted the host and now I can't load the Kubuntu partition at boot time. I get a maintenance shell and the Kubuntu partition is read-only. I am able to boot XP as usual. I removed the HDD and tried to mount it on another computer as an external drive and neither partition (XP or Kubuntu) will be recognized, it just appears to be one device that still mounts and appears empty. From the maintenance shell I can see all the files are still on the Kubuntu partition. How can I undo what I did when I accidentally booted Kubuntu inside itself? Is it a matter of unlocking some files somewhere? how can I do that on a RO filesystem? Thanks!

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• Multiboot USB (OSX only): How to customize partition name?

  - by wrk2bike

  Trying to deal with all the Mac OSX recovery disks I've got by moving them to bootable USB images. I've got a big USB drive with multiple partitions for each recovery disk, and it's easy to use Disk Utility to "restore" the recovery DVD to a partition. When I boot my target Mac while holding down the Alt key, I can see all my bootable images and they work great. Problem is, they've all got the same name: "Mac OS X Install DVD." I manage Macs of various vintages. If my target Mac needs 10.6.3 for example, my only option seems to be to try each one until I get past the "Mac OSX can't be installed on this computer" message. I originally named my partitions with the OSX revision number, but that name is replaced by the disk image name during Disk Utility restore. Is there any way to customize the name during or after Disk Utility restore? I tried making a new DVD image on disk first and renaming it, but when I restore it to my recovery partition it has the original name. EDIT: After booting to the wrong partition, and getting the "..can't be installed" message, I can open the Startup Disk menu and see the other partitions - and as I select each one, the info at the bottom indicates which OS revision is on that partition. So I know the info is in there! Just want it at the boot screen if possible.

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• How to copy a large LVM volume (14TB) from one server to another?

  - by bruce

  I have to copy a very large LVM volume from server A to server B. Below is the filesystem of server A and server B Server A [root@AVDVD-Filer ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_avdvdfiler-lv_root 16T 14T 1.5T 91% / tmpfs 3.0G 0 3.0G 0% /dev/shm /dev/cciss/c0d0p1 194M 23M 162M 13% /boot /dev/mapper/vg_avdvdfiler-test 2.3T 201M 2.1T 1% /test /dev/sr0 3.3G 3.3G 0 100% /mnt server B [root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-LogVol00 20G 2.5G 16G 14% / tmpfs 3.0G 0 3.0G 0% /dev/shm /dev/cciss/c0d0p1 194M 23M 162M 13% /boot /dev/mapper/VolGroup00-LogVol00 16T 133M 15T 1% /xiangao/lv1 /dev/mapper/VolGroup00-LogVol01 4.7T 190M 4.5T 1% /xiangao/lv2 I want to copy the LVM volume /dev/mapper/vg_avdvdfiler-lv_root on server A to LVM volume /dev/mapper/VolGroup00-LogVol00 on server B. Server A and server B are in the same IP segment. In the LVM volume on server A, there is all average 500M avi wmv mp4 etc. I tried mounting /dev/mapper/vg_avdvdfiler-lv_root on server A to server B through NFS, then use cp to copy. It is clear I failed. Because the LVM volume is too big, I do not have good idea why. I hope a good solution here.

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• Is it possible to ack nagios alerts from the terminal on a remote workstation?

  - by cat pants

  I have nagios alerts set up to come through jabber with an http link to ack. Is is possible there is a script I can run from a terminal on a remote workstation that takes the hostname as a parameter and acks the alert? ./ack hostname The benefit, while seemingly mundane, is threefold. First, take http load off nagios. Secondly, nagios http pages can take up to 10-20 seconds to load, so I want to save time there. Thirdly, avoiding slower use of mouse + web interface + firefox/other annoyingly slow browser. Ideally, I would like a script bound to a keyboard shortcut that simply acks the most recent alert. Finally, I want to take the inputs from a joystick, buttons and whatnot, and connect one to a big red button bound to the script so I can just ack the most recent nagios alert by hitting the button lol. (It would be rad too if the button had a screen on the enclosure that showed the text of the alert getting acked lol) Make fun of me all you want, but this is actually something that would be useful to me. If I can save five seconds per alert, and I get 200 alerts per day I need to ack, that's saving me 15 minutes a day. And isn't the whole point of the sysadmin to automate what can be automated? Thanks!

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• How to minimize the risk of employees spreading critical information? [closed]

  - by Industrial

  What's common sense when it comes to minimising the risk of employees spreading critical information to rivalling companies? As of today, it's clear that not even the US government and military can be sure that their data stays safely within their doors. Thereby I understand that my question probably instead should be written as "What is common sense to make it harder for employees to spread business critical information?" If anyone would want to spread information, they will find a way. That's the way life work and always has. If we make the scenario a bit more realistic by narrowing our workforce by assuming we only have regular John Does onboard and not Linux-loving sysadmins , what should be good precautions to at least make it harder for the employees to send business-critical information to the competition? As far as I can tell, there's a few obvious solutions that clearly has both pros and cons: Block services such as Dropbox and similar, preventing anyone to send gigabytes of data through the wire. Ensure that only files below a set size can be sent as email (?) Setup VLANs between departments to make it harder for kleptomaniacs and curious people to snoop around. Plug all removable media units - CD/DVD, Floppy drives and USB Make sure that no configurations to hardware can be made (?) Monitor network traffic for non-linear events (how?) What is realistic to do in a real world? How does big companies handle this? Sure, we can take the former employer to court and sue, but by then the damage has already been caused... Thanks a lot

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• Partition Magic 8 made TrueCrypt partition invisible

  - by gmancoda

  Partition Magic 8 took a dump on my TrueCrypt partition... and I let it happen! And now I am left with cleaning up the mess. In short, my encrypted partition is now invisible. TestDisk analysis says of the disk containing the encrypted partition: "Space conflict between the following two partitions". From the googling and searching on various sites, I have learned the following: Hex editing is beyond me. Partition recovery tools are useless. I am not ready to drop the big bucks for professional help. ... that I should have kept an external backup of the Volume header. Now, to get back the volume header, I am planning on recreating the exact same partitions on a new disk of the exact same model, and then encrypting it with the exact same password/keyfiles, and then exporting its volume header to a file. Finally, I hope to be able to restore this volume header on to my damaged drive. Before I undertake this plan, I would like to know if anyone else out there has tried it and, if so, how successful they were. All other suggestions and tips and welcome!! Thanks.

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