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  • How can one associate a 3ware controller with the corresponding /dev/tw?? device?

    - by barbaz
    I have a few 3ware RAID controllers installed in a system. Is there any way to figure out the mapping between the following identifiers, each describing in a way the very same RAID controller? The tw_cli reported controller id (e.g. c0,c1,c2,...) The corresponding device nodes that allow smartctl access via the 3ware driver (e.g. /dev/twa0, /dev/twa1, /dev/twl0) The block device presented to the system representing a RAID unit (/dev/sda, /dev/sdb,...)

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  • XSLT Transforming sequential XML to hierarchical XML

    - by Jean-Paul Smit
    I have a requirement to transform a sequential XML node list into a hierarchical, but I run into some XSLT specific knowledge gap. The input XML contains articles, colors and sizes. In the sample below 'Record1' is an article, 'Record2' represents a color and 'Record3' are the sizes. The number of colors and sizes (record2 and record3) elements can vary. <root> <Record1>...</Record1> <Record2>...</Record2> <Record3>...</Record3> <Record3>...</Record3> <Record2>...</Record2> <Record3>...</Record3> <Record3>...</Record3> <Record3>...</Record3> <Record3>...</Record3> <Record1>...</Record1> <Record2>...</Record2> <Record3>...</Record3> <Record3>...</Record3> <Record2>...</Record2> <Record3>...</Record3> <Record3>...</Record3> <Record3>...</Record3> <Record3>...</Record3> </root> All fields are on the same hierarchical level, but still I have to create this structure as output: <root> <article> -> Record1 <color> -> Record2 <size>...</size> -> Record3 <size>...</size> -> Record3 </color> <color> -> Record2 <size>...</size> -> Record3 <size>...</size> -> Record3 <size>...</size> -> Record3 <size>...</size> -> Record3 </color> </article> <article> -> Record1 <color> -> Record2 <size>...</size> -> Record3 <size>...</size> -> Record3 </color> <color> -> Record2 <size>...</size> -> Record3 <size>...</size> -> Record3 <size>...</size> -> Record3 <size>...</size> -> Record3 </color> </article> </root> I've tried to iterate the nodes sequentially but for example the 'article' (=record1) node tag needs to remain unclosed while 'color' (=record2) nodes are processed. The same counts for processing 'size' (=record3) having 'color' unclosed, but that is not allowed by XSLT. My next idea was to call a template for every article, color and size level, but I don't know how to select for example all 'record3' nodes between the current 'record2' and the next article represented by 'record1'. I've also got a limitation on the XSLT version because I need this transformation in BizTalk Server which only supports XSLT 1.0 Can someone push me in the right direction?

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  • puppet variables

    - by Joey Bagodonuts
    I am trying to use variables in my modules manifest.pp with little luck class mysoftware($version="dev-2011.02.04b") { File { links => follow } file { "/opt/mysoftware": ensure => directory } file { "/opt/mysoftware/share": source => "puppet://puppet/mysoftware/air/$version", recurse => "true", } } This does not seem to be working when I assign this to a node via the nodes.pp file. I am running puppetmaster 2.6.4 puppetd clients are 0.25

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  • Disable password complexity rule in Active Directory

    - by Dan Revell
    Where do I go to disable the password complexity policy for the domain. I've logged onto the domain controller (Windows Server 2008) and found the option in local policies which is of course locked from any changes. However I can't find the same sort of policies in the group policy manager. Which nodes do I have to expand out to find it?

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  • High availability for databases (DRBD + GFS)?

    - by EvanAlm
    Does it work to have like an MySQL (or any other relational database) on the GFS (with DRBD) and have multiple nodes reading and writing to it? Is that the "best" way of providing a HA database/application setup if so? Is RHEL (cluster suite) a good way to set up this? (or centos)

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  • Local and public IPs on the same switch?

    - by Andrew
    It's all pretty much in the title. Is it possible to assign both local and public IPs to different nodes connected to the same switch? I have 4 servers with 2 gigabit ethernet ports each. I want one of each to have a public IP, and the remaining ports to have local IPs for server-to-server traffic. Sorry if it's a dumb question. I didn't see anything about it on here already.

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  • Does AWS resolve same-datacenter hostnames to 10.* addresses for different customer accounts?

    - by Scott Ritchie
    If I bring up two Amazon EC2 instances and run nslookup on one for the other's hostname, amazon will return a 10.* address. This is routable within amazon, and works just fine. But does this work between different accounts? If I use one of my nodes to nslookup a hostname belonging to another customer (but still in the same datacenter) will it resolve as a 10.* address or will it give the standard public IP?

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  • Best way to segment traffic, Vlan or subnet

    - by thebird
    We have a medium sized network of around 200 nodes and are currently in the process of replacing old daisy chained switches with stack-able or chassis style switches. Right now our network is broken up via subnet; production, management, IP, etc each on a separate subnet. Does anyone have an opinion on whether creating Vlan's instead of subnets would be more beneficial? Our general goal is to prevent bottlenecks, separate traffic for security, and to manage traffic with more ease.

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  • Change a Munin server and keep the data

    - by Khelben
    We are migrating some servers, and we need tp change our Munin server. Most of the Munin nodes are not changed, and we would want to keep track of the historical data, if possible. I can set up a new Munin server, but I like to know if it's possible to transfer the old data to the new server, and how to do it.

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  • Alternate Out of Order TCP Packets problem

    - by Sunil
    I am having a network of windows and embedded nodes connected on a series of cisco switch. I have been seeing some serious network problems from few days. Used wireshark to capture the network trace and see every alternate tcp packets being marked as "out of order". Any pointers on how to troubleshoot this problem?

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  • Accountability in a cloud infrastructure (Amazon, etc)

    - by WinkyWolly
    I was curious how companies such as Amazon would handle some sort of investigation that needed to look into data potentially stored on one of their on-demand nodes. What typically happens to data in an environment like this after the VM is destroyed (literally what happens on the disk / FS)? Would it actually be possible to recover data from a destroyed node? Just a curiosity :)

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  • Need help in using svn on ubuntu 9.10

    - by michael
    Hi, I have install svn on ubuntu 9.10. But when I try to use svn to checkout code for an open source project, i get this error: $ svn co svn://svn.valgrind.org/valgrind/trunk valgrind svn: Berkeley DB error for filesystem '/home/svn/repos/valgrind/db' while opening 'nodes' table: Cannot allocate memory svn: bdb: Lock table is out of available locker entries Can you please tell me how to fix it? Thank you.

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  • Why should I use a switched network over routed?

    - by SRobertJames
    Now that routers are affordable, why should I build a network using Layer 2 switches, which degenerate to broadcasting under poor conditions, and not just use real routing at Layer 3? Edit: Got some great replies. Let me clarify the question: Of course, at the lowest level, you want to plug your end nodes into a switch, not a router (as demonstrated by AlReece). I'm referring to switches which are used to bridge traffic between segments - that is, switches connected to other switches.

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  • What kind of scaling method is it, when you add new software to a single server to handle more users? [on hold]

    - by Phil
    I have read about scaling (in terms of terminology and methods). This got me confused about the following: On a single computer, running a web server (say apache), if the system administrator adds a front, caching, reverse-proxy such as Varnish, which in that scenario increase the amount of requests this server is able to handle. My question: Setting up such cache increases the capacity of the server to handle work, hence scales it, but without increasing neither the amount of nodes or the node's capacity. What is the name for this type of scaling?

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  • XSLT templates and recursion

    - by user333411
    Hi All, Im new to XSLT and am having some problems trying to format an XML document which has recursive nodes. My XML Code: Hopefully my XML shows: All <item> are nested with <items> An item can have either just attributes, or sub nodes The level to which <item> nodes are nested can be infinently deep <?xml version="1.0" encoding="utf-8" ?> - <items> <item groupID="1" name="Home" url="//" /> - <item groupID="2" name="Guides" url="/Guides/"> - <items> - <item groupID="26" name="Online-Poker-Guide" url="/Guides/Online-Poker-Guide/"> - <items> - <item> <id>107</id> - <title> - <![CDATA[ Poker Betting - Online Poker Betting Structures ]]> </title> - <url> - <![CDATA[ /Guides/Online-Poker-Guide/online-poker-betting-structures ]]> </url> </item> - <item> <id>114</id> - <title> - <![CDATA[ Beginners&#39; Poker - Poker Hand Ranking ]]> </title> - <url> - <![CDATA[ /Guides/Online-Poker-Guide/online-poker-hand-ranking ]]> </url> </item> - <item> <id>115</id> - <title> - <![CDATA[ Poker Terms - 4th Street and 5th Street ]]> </title> - <url> - <![CDATA[ /Guides/Online-Poker-Guide/online-poker-poker-terms ]]> </url> </item> - <item> <id>116</id> - <title> - <![CDATA[ Popular Poker - The Popularity of Texas Hold&#39;em ]]> </title> - <url> - <![CDATA[ /Guides/Online-Poker-Guide/online-poker-popularity-texas-holdem ]]> </url> </item> - <item> <id>364</id> - <title> - <![CDATA[ The Impact of Traditional Poker on Online Poker (and vice versa) ]]> </title> - <url> - <![CDATA[ /Guides/Online-Poker-Guide/online-poker-tradional-vs-online ]]> </url> </item> - <item> <id>365</id> - <title> - <![CDATA[ The Ultimate, Absolute Online Poker Scandal ]]> </title> - <url> - <![CDATA[ /Guides/Online-Poker-Guide/online-poker-scandal ]]> </url> </item> </items> - <items> - <item groupID="27" name="Beginners-Poker" url="/Guides/Online-Poker-Guide/Beginners-Poker/"> - <items> + <item> <id>101</id> - <title> - <![CDATA[ Poker Betting - All-in On the Flop ]]> </title> - <url> - <![CDATA[ /Guides/Online-Poker-Guide/Beginners-Poker/poker-betting-all-in-on-the-flop ]]> </url> </item> + <item> <id>102</id> - <title> - <![CDATA[ Beginners&#39; Poker - Choosing an Online Poker Room ]]> </title> - <url> - <![CDATA[ /Guides/Online-Poker-Guide/Beginners-Poker/beginners-poker-choosing-a-room ]]> </url> </item> + <item> <id>105</id> - <title> - <![CDATA[ Beginners&#39; Poker - Choosing What Type of Poker to Play ]]> </title> - <url> - <![CDATA[ /Guides/Online-Poker-Guide/Beginners-Poker/beginners-poker-choosing-type-to-play ]]> </url> </item> + <item> <id>106</id> - <title> - <![CDATA[ Online Poker - Different Types of Online Poker ]]> </title> - <url> - <![CDATA[ /Guides/Online-Poker-Guide/Beginners-Poker/online-poker ]]> </url> </item> + <item> <id>109</id> - <title> - <![CDATA[ Online Poker - Opening an Account at an Online Poker Site ]]> </title> - <url> - <![CDATA[ /Guides/Online-Poker-Guide/Beginners-Poker/online-poker-opening-an-account ]]> </url> </item> + <item> <id>111</id> - <title> - <![CDATA[ Beginners&#39; Poker - Poker Glossary ]]> </title> - <url> - <![CDATA[ /Guides/Online-Poker-Guide/Beginners-Poker/beginners-poker-glossary ]]> </url> </item> + <item> <id>117</id> - <title> - <![CDATA[ Poker Betting - What is a Blind? ]]> </title> - <url> - <![CDATA[ /Guides/Online-Poker-Guide/Beginners-Poker/poker-betting-what-is-a-blind ]]> </url> </item> - <item> <id>118</id> - <title> - <![CDATA[ Poker Betting - What is an Ante? ]]> </title> - <url> - <![CDATA[ /Guides/Online-Poker-Guide/Beginners-Poker/poker-betting-what-is-an-ante ]]> </url> </item> + <item> <id>119</id> - <title> - <![CDATA[ Beginners Poker - What is Bluffing? ]]> </title> - <url> - <![CDATA[ /Guides/Online-Poker-Guide/Beginners-Poker/online-poker-what-is-bluffing ]]> </url> </item> - <item> <id>120</id> - <title> - <![CDATA[ Poker Games - What is Community Card Poker? ]]> </title> - <url> - <![CDATA[ /Guides/Online-Poker-Guide/Beginners-Poker/online-poker-what-is-community-card-poker ]]> </url> </item> - <item> <id>121</id> - <title> - <![CDATA[ Online Poker - What is Online Poker? ]]> </title> - <url> - <![CDATA[ /Guides/Online-Poker-Guide/Beginners-Poker/online-poker-what-is-online-poker ]]> </url> </item> </items> </item> </items> </item> </items> </item> </items> The XSL code: <?xml version="1.0" encoding="ISO-8859-1"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output method="html" indent="yes"/> <xsl:template name="loop"> <xsl:for-each select="items/item"> <ul> <li><xsl:value-of select="@name" /></li> <xsl:if test="@name and child::node()"> <ul> <xsl:for-each select="items/item"> <li><xsl:value-of select="@name" />test</li> </xsl:for-each> </ul> <xsl:call-template name="loop" /> </xsl:if> <xsl:if test="child::node() and not(@name)"> <xsl:for-each select="/items"> <li><xsl:value-of select="id" /></li> </xsl:for-each> </xsl:if> </ul> </xsl:for-each> <xsl:for-each select="item/items/item"> <li>hi</li> </xsl:for-each> </xsl:template> <xsl:template match="/" name="test"> <xsl:call-template name="loop" /> </xsl:template> </xsl:stylesheet> Im trying to write the XSL so that every <items> node will render a <ul> and every <items> node will render an <li>. The XSL needs to be recursive because i cant tell how deep the nested nodes will go. Can anyone help? Regards, Al

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  • C# graph library to be used from Unity3D

    - by Heisenbug
    I'm looking for a C# graph library to be used inside Unity3D script. I'm not looking for pathfinding libraries (I know there are good one available). I could consider using a path finding library only if it gives me direct access to underlying graph classes (I need nodes and edges, and classic graph algorithms) The only product I've seen that seems intersting is QuickGraph. I have the following question: Is it possible to use QuickGraph inside Unity3d? If yes. Is this a good idea? Does it have any drawbacks? Is it a quite fast and well written/supported library? Does anyone has ever used it? Are available other C# graph library that can be easily integrated in Unity3d?

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  • Reset MAAS after loosing Juju configuration?

    - by Azendale
    I managed to delete my Juju client cofiguration without running a juju destroy-environment first, leaving my MaaS in a state where I could not deploy to it. I would get the following (conflicting) output $ juju bootstrap ERROR environment is already bootstrapped $ juju status ERROR Unable to connect to environment "". Please check your credentials or use 'juju bootstrap' to create a new environment. Error details: no instances found So, I tried running juju destroy-environment with the new config, to see if it would clean up the old Juju environment on the MaaS system. It gave me the error "ERROR gomaasapi: got error back from server: 409 CONFLICT". I went into the MaaS GUI and stopped the leftover machines, and then deleted all the nodes and had then go through the discovery and commissioning stages again, but I still got the same errors after all that! Is there a way to reset this?

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  • 409 CONFLICT : MAAS

    - by amir beygi
    I have some problem with my MAAS. juju bootstrap result: 2012-08-31 03:59:17,721 INFO Bootstrapping environment 'maas' (origin: distro type: maas)... Unexpected Error interacting with provider: 409 CONFLICT 2012-08-31 03:59:17,951 ERROR Unexpected Error interacting with provider: 409 CONFLICT Also i have 3 nodes in Commissioning status (delete node is disable and no start button) , DHCP seems working because LAN boot is working but boot but ends with : ALERT! /dev/disk/by-label/cloudimg-rootfs does not exist. Dropping to a shell! BusyBox.... (initramfs)

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  • Introducing a new Umbraco datatype for Multi-lingual websites.

    - by Vizioz Limited
    Over the last 6 months we have been building various multi-lingual sites for different clients and for some of the clients they have 1 to 1 relationships between some or all of their pages.Within Umbraco, you can copy a page ( or whole tree of pages ) and keep a relationship between each of the pages and their new copy, this allows content editors to subscribe to change notifications that Umbraco can create if one of the linked pages is changed.Unfortunately one thing that is missing in Umbraco is any way to see which pages are related to each other and to have a quick and easy way to jump between the related pages.We created a datatype that solves these problems and thought we would release it as an open source project ( which we are still maintaining )Currently you can:1) See current relationships2) Add relationships3) Limit the number of relationships that can be added ( by the data type )4) See the Country flag ( assuming a culture has been set on each of your top level site nodes for each country site )5) Link between the documents6) Change or delete the linksAn example where multiple languages are allowed:An example where only 2 languages exist (1 relationship):You can download the datatype from the Umbraco project page:Vizioz Relationships for UmbracoPlease do let us know what you think :)

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  • Partition Wise Joins

    - by jean-pierre.dijcks
    Some say they are the holy grail of parallel computing and PWJ is the basis for a shared nothing system and the only join method that is available on a shared nothing system (yes this is oversimplified!). The magic in Oracle is of course that is one of many ways to join data. And yes, this is the old flexibility vs. simplicity discussion all over, so I won't go there... the point is that what you must do in a shared nothing system, you can do in Oracle with the same speed and methods. The Theory A partition wise join is a join between (for simplicity) two tables that are partitioned on the same column with the same partitioning scheme. In shared nothing this is effectively hard partitioning locating data on a specific node / storage combo. In Oracle is is logical partitioning. If you now join the two tables on that partitioned column you can break up the join in smaller joins exactly along the partitions in the data. Since they are partitioned (grouped) into the same buckets, all values required to do the join live in the equivalent bucket on either sides. No need to talk to anyone else, no need to redistribute data to anyone else... in short, the optimal join method for parallel processing of two large data sets. PWJ's in Oracle Since we do not hard partition the data across nodes in Oracle we use the Partitioning option to the database to create the buckets, then set the Degree of Parallelism (or run Auto DOP - see here) and get our PWJs. The main questions always asked are: How many partitions should I create? What should my DOP be? In a shared nothing system the answer is of course, as many partitions as there are nodes which will be your DOP. In Oracle we do want you to look at the workload and concurrency, and once you know that to understand the following rules of thumb. Within Oracle we have more ways of joining of data, so it is important to understand some of the PWJ ideas and what it means if you have an uneven distribution across processes. Assume we have a simple scenario where we partition the data on a hash key resulting in 4 hash partitions (H1 -H4). We have 2 parallel processes that have been tasked with reading these partitions (P1 - P2). The work is evenly divided assuming the partitions are the same size and we can scan this in time t1 as shown below. Now assume that we have changed the system and have a 5th partition but still have our 2 workers P1 and P2. The time it takes is actually 50% more assuming the 5th partition has the same size as the original H1 - H4 partitions. In other words to scan these 5 partitions, the time t2 it takes is not 1/5th more expensive, it is a lot more expensive and some other join plans may now start to look exciting to the optimizer. Just to post the disclaimer, it is not as simple as I state it here, but you get the idea on how much more expensive this plan may now look... Based on this little example there are a few rules of thumb to follow to get the partition wise joins. First, choose a DOP that is a factor of two (2). So always choose something like 2, 4, 8, 16, 32 and so on... Second, choose a number of partitions that is larger or equal to 2* DOP. Third, make sure the number of partitions is divisible through 2 without orphans. This is also known as an even number... Fourth, choose a stable partition count strategy, which is typically hash, which can be a sub partitioning strategy rather than the main strategy (range - hash is a popular one). Fifth, make sure you do this on the join key between the two large tables you want to join (and this should be the obvious one...). Translating this into an example: DOP = 8 (determined based on concurrency or by using Auto DOP with a cap due to concurrency) says that the number of partitions >= 16. Number of hash (sub) partitions = 32, which gives each process four partitions to work on. This number is somewhat arbitrary and depends on your data and system. In this case my main reasoning is that if you get more room on the box you can easily move the DOP for the query to 16 without repartitioning... and of course it makes for no leftovers on the table... And yes, we recommend up-to-date statistics. And before you start complaining, do read this post on a cool way to do stats in 11.

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  • How to apply numerical integration on a graph layout

    - by Cumatru
    I've done some basic 1 D integration, but i can't wrap my head around things and apply it to my graph layout. So, consider the picture below: if i drag the red node to the right, i'm forcing his position to my mouse position the other nodes will "follow" him, but how ? For Verlet, to compute the newPosition, i need the acceleration for every node and the currentPosition. That is what i don't understand. How to i compute the acceleration and the currentPosition ? The currentPosition will be the position of the RedNode ? If yes, doesn't that means that they will all overlap ? http://i.stack.imgur.com/NCKmO.jpg

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