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• What to see in India as a developer and student

  - by lasseespeholt

  Hi, I'm planning a trip to India around July-August. And I want to hear Indian developers or developers traveled to India if there are something interesting to see in India (around Bombay) for developers in general. Maybe a conference etc. I have looked at http://www.conferencealerts.com/computing.htm I have studied computer science in a year now but have been a spare time and independent developer for some years now. Furthermore, I have tried finding summer courses but that is properly too late now and computer science summer courses is hard to find in India. Best regards, Lasse Espeholt

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• Changed array composition, mdadm --detail still shows the old array size

  - by Prody

  I have a machine with 8 disks. I installed it with my hoster's install automation (it's OVH, I don't have physical access to it). The machine installed correctly, but it made an array that I wanted to change. It created a raid5 array across 5/8 disks and I've changed it to raid10 across 8 disks. I've done this by first --stopping the old array and then --creating the new array. It warned me that a previous array was there, but I chose to continue. So it created the array, spent 10ish hours syncing it and now that it's ready I get this strange behavior: When I fdisk p on it, I see the correct size. But when I mdadm --detail it I see the old array's size even tho I get the new composition and level. When I try to pvcreate on it, i get the old size again for some reason. Did I have to do something else? Did I miss something?

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• How do I swap audio output of the left and right speakers?

  - by Manga Lee

  I have two speakers stereo speakers but when I use the sound control panel applet to test my audio configuration I get sound in the right speaker when the user interface indicates the right speaker and vice versa. Is there a way to swap the audio output from left to right and right to left? UPDATE: The reason for this question is that I've recently rearranged my workspace and because of physical constraints the left speaker has to go on the right side and vice versa. I could of course solve this problem with a hardware solution but I'd rather use a software solution if one is available.

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• NTFS write speed really slow (<15MB/s)

  - by Zulakis

  I got a new Seagate 4TB harddrive formatted with ntfs using parted /dev/sda > mklabel gpt > mkpart pri 1 -1 mkfs.ntfs /dev/sda1 When copying files or testing writespeed with dd, the max writespeed I can get is about 12MB/s. The harddrive should be capable of atleast 100MB/s. top shows high cpu usage for the mount.ntfs process. The system has a AMD dualcore. This is the output of parted /dev/sda unit s print: Model: ATA ST4000DM000-1F21 (scsi) Disk /dev/sda: 7814037168s Sector size (logical/physical): 512B/4096B Partition Table: gpt Number Start End Size File system Name Flags 1 2048s 7814035455s 7814033408s pri The used kernel is 3.5.0-23-generic. The ntfs-3g versions I tried are ntfs-3g 2012.1.15AR.1 (ubuntu 12.04 default) and the newest version ntfs-3g 2013.1.13AR.2. When formatted with ext4 I get good write speeds with about 140MB/s. How can I fix the writespeed?

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• Efficiently compute the row sums of a 3d array in R

  - by Gavin Simpson

  Consider the array a: > a <- array(c(1:9, 1:9), c(3,3,2)) > a , , 1 [,1] [,2] [,3] [1,] 1 4 7 [2,] 2 5 8 [3,] 3 6 9 , , 2 [,1] [,2] [,3] [1,] 1 4 7 [2,] 2 5 8 [3,] 3 6 9 How do we efficiently compute the row sums of the matrices indexed by the third dimension, such that the result is: [,1] [,2] [1,] 12 12 [2,] 15 15 [3,] 18 18 ?? The column sums are easy via the 'dims' argument of colSums(): > colSums(a, dims = 1) but I cannot find a way to use rowSums() on the array to achieve the desired result, as it has a different interpretation of 'dims' to that of colSums(). It is simple to compute the desired row sums using: > apply(a, 3, rowSums) [,1] [,2] [1,] 12 12 [2,] 15 15 [3,] 18 18 but that is just hiding the loop. Are there other efficient, truly vectorised, ways of computing the required row sums?

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• Dell Power Edge R515 - Replacing a Bad Hard Drive in a RAID

  - by LonnieBest

  I've ordered a new hard drive to replace a bad one in a Dell Power Edge R515. The manual covers obvious topics regarding physical replacing of hard drives, but I've never done this before on a production server where RAID is involved. I've heard people talk about this topic, and I've heard that some servers have RAID controllers that are smart enough to allow you to just put in the new drive (hot swap), and then the server will know automatically how to rebuild that drive to be what the old one was to the system. Where do I find the proper procedure for replacing a failed hard drive on a live production Dell Power Edge R515? Can someone with experience tell me how easy or hard this usually is?

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• Understanding ESXi and Memory Usage

  - by John

  Hi, I am currently testing VMWare ESXi on a test machine. My host machine has 4gigs of ram. I have three guests and each is assigned a memory limit of 1 GB (and only 512 MB reserved). The host summary screen shows a memory capacity of 4082.55 MB and a usage of 2828 MB with two guests running. This seems to make sense, two gigs for each VM plus an overhead for the host. 800MB seems high but that is still reasonable. But on the Resource Allocation Screen I see a memory capacity of 2356 MB and an available capacity of 596 MB. Under the configuration tab, memory link I see a physical total of 4082.5 MB, System of 531.5 MB and VM of 3551.0 MB. I have only allocated my VMs for a gig each, and with two VMs running they are taking up almost two times the amount of ram allocated. Why is this, and why does the Resource Allocation screen short change me so much?

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• what constitutes out-of-band access to a server?

  - by broiyan

  The first time I access my server with a new installation of Filezilla or Putty, I will get prompted that I should continue only if the RSA key shown to me is correct. The cloud provider has advice on their website that I ought to use their AJAX console to get a key out-of-band with which to compare to the one shown by Filezilla. The AJAX console is launched from a link on the cloud provider's website which requires a login. Exactly how is this AJAX console considered to be out-of-band when it obviously is not a form of physical access to the server?

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• What is the effect on LVM snapshot size when a file block is rewritten with it's original contents?

  - by NevilleDNZ

  I'm exploring using LVM snapshot's to off site incremental archives from a snapshot "master" file system. In essence: simply copy across only the files on the "master" that have changed since the last incremental copy to the "archive". Then snapshot the "archive" to retain the incremental. I am a bit puzzled as to the block usage behaviour of the archive's own incremental snapshot. I'm expecting that LVM is not smart enough to know that the "file block" is actually unchanged, and the a new copy will be allocated and written for the fresh "archive" file system. Can anyone confirm this, or point me to a document/page that gives some hints? BTW: the OS hard disk cache, hard disk physical cache and hard disk itself also doesn't need to do any actual "disk writes" as the "disk block" likewise is unnecessary. Any pointers to discussion of this style of optimisation would also be ineresting.

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• Memory management (segmentation and paging) in 80286 and 80386: How does it work?

  - by Andrew J. Brehm

  I found lots of Web sites and books explaining how memory management worked on the 8086 and later x86 CPUs in Real Mode. I understand, I think, how two 16 bit values, segment address and offset are combined to get a linear 20 bit physical address (shift segment four bits to the left, add offset; segments are 64K and start every 16 bytes). But I couldn't find any good Web sites or books that explained how memory management works in Protected Mode, specifically the differences between 80286 and 80386. Can anyone point me to a good Web site or book (or explain it right here)? (For extra credit, i.e. an upvote, how does it work in Long Mode?)

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• Why does my netbook have more USB controllers than ports?

  - by yodaj007

  My netbook has three USB ports, but when I look in the device manager: Five are listed. Does this matter in the least (or, why are five listed)? The reason I bring this up: See, if I know that two of the devices in the device manager don't actually have physical ports, I can disable then and up that percentage on the other three, correct? I'm constantly being told that my devices can perform faster if I connect them to a USB 2.0 port, but this netbook is less than a year old. Thanks.

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• How to connect 2 virtual hosts running on the same machine?

  - by Gabrielle

  I have 2 virtual hosts running on my Windows XP laptop. One is Ubuntu running inside vmware player. The other is MS virtual PC (so I can test with IE6 ). The Ubuntu virtual host is running my web application with apache. I can point my browser on my laptop at the Ubuntu IP and view my web app. I read this post http://stackoverflow.com/questions/197792/how-to-connect-to-host-machine-from-within-virtual-pc-image and was able to get my Virtual PC to ping my physical machine using the loopback adapter. But I'm stuck on getting my Virtual PC to see my web application running in the Ubuntu vmware player host. I appreciate any suggestions.

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• LVM, Soft RAID1, and Replication?

  - by mtkoan

  Hi all, I am practicing putting together a HA file server. It is a linux server with 2 1.5TB Hard drives. My plan is to use LVM to manage the physical volumes into logical volumes for /, /home, and /var. Then use md (soft RAID 1) to mirror the image onto the second HDD, THEN use DRDB to mirror the entire setup another server. Is this overkill? Would I just be okay with just md and DRDB? The system will serve user's homedirs (~100) and probably some groupware or other local intranet. On my own machines I've always separated root and /home partitions in case I break something, I can easily reinstall the OS. Should I follow that same theory here? If so I need LVM, because I really can't predict where we'll need more space, /var or /home.

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• VMware virtual network adapters and Windows Firewall

  - by anonymous

  I am running VMware Workstation 7.1.4 on Windows 7 Enterprise SP1-U (x64). Aside from the physical network adapter, I have created a single virtual network adapter (VMware Virtual Ethernet Adapter for VMnet1) which is connected to (can be seen by) the host and the guests. My problem is, even after applying the "*NdisDeviceType = 1" tweak to the virtual adapter, making it disappear from the Network and Sharing Center, I still can't connect to programs running in the host from the guests, unless I specifically "allowed the program to communicate with the public network" using the Windows Firewall (which I don't want to do). This happens to all the programs and services running in the host (File and Printer Sharing, Database server, HTTP proxy, etc.) I am getting the impression that applying the "*NdisDeviceType = 1" tweak only hides a network from the Network and Sharing Center but not actually making it private. Any hints and suggestions?

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• Use System Restore to rescue lost user profile in Win XP?

  - by im_chc

  Hi! My win XP account profile has recently been "reset". Many app settings are lost. For example, the "recent project" list in VS 2005 is empty. There should be lots of other stuffs that are painfully lost without me knowing! What can I do? Can I retrieve the app settings from System Restore? I don't have much confidence on this util, even tho I think restoring to a point when the profile still works, and back up away the C:\Documents and Settings (is it where all the app setting files are located?), that should work... Is it reliable to restore to a previous restore pt and then goes back to the latest RP? I've googled on System Restore, looks like what the util does is just back up some physical files, and restore them when doing System Restore. That sounds quite safe, but I am still uncomfortable to this. Thx for u guys' help in advance!

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• Slowness on Exchange 2007 Server (network related we think)

  - by Az

  We are seeing some odd behavior out of our exchange 2007 server. I believe it is network related as during the slowness in response from the exchange server. During these times downloading files to server is fraught with connection resets and extreme slow download speeds that are not affecting other servers right on the same subnet with the same gateway and ISP. We have about 50 users at a time using Outlook 2003 from a terminal server not displaying any other signs of slowness, all network slowness is confirmed trying downloads on the exchange server itself. Checked for virus issues, there are none. Checked for hardware issues, none found I am noticing between 200-400 TCPv4 connections established I am seeing around 100k tcpv4(active) connections according to perfmon are these numbers odd? Has anyone run into anything similar? Our server has a gigbabit NIC linked to a gigabit switch using cat6 so I do not believe it is "physical". Thanks!

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• Flow of packets in network

  - by user58859

  I can't visualize in my mind the network traffic flow. eg. If there are 15 pc's in a LAN When packet goes from router to local LAN, do it passes all the computers? Does it go to the ethernet card of every computer and those computers accept the packet based on their physical address? To which pc the packet will go first? To the nearest to the router? What happens if that first pc captures that packet(though it is not for it)? What happens when a pc broadcast a message? Do it have to generate 14 packets for all the pc's or only one packet reach to all pc's? If it is one packet and captured by first pc, how other pc's can get that? I can't imagine how this traffic is exactly flows? May be my analogy is completely wrong. Can anybody explain me this?

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• How to control remote access to Sonicwall VPN beyond passwords?

  - by pghcpa

  I have a SonicWall TZ-210. I want an extremely easy way to limit external remote access to the VPN beyond just username and password, but I do not wish to buy/deploy a OTP appliance because that is overkill for my situation. I also do not want to use IPSec because my remote users are roaming. I want the user to be in physical possession of something, whether that is a pre-configured client with an encrypted key or a certificate .cer/.pfx of some sort. SonicWall used to offer "Certificate Services" for authentication, but apparently discontinued that a long time ago. So, what is everyone using in its place? Beyond the "Fortune 500" expensive solution, how do I limit access to the VPN to only those users who have possession of a certificate file or some other file or something beyond passwords? Thanks.

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• Support-function in the GJK-algorithm.

  - by Marcus Johansson

  I am trying to implement the GJK-algorithm but I got stuck instantly. The problem is to implement the Support-function that isn't O(n^2). As it is now I'm computing the complete Minkowski difference, and then there is really no point in doing the GJK-algorithm. (or is it?) What I mean by Support-function is the function that returns the point in the Minkowski difference that is furthest away in a specified direction. I assume this shouldn't be O(n^2) as it is in my current implementation.

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• ESXi 5.1 - Unable to register host

  - by deanvz

  I download and successfully installed ESXi 5.1. I am however unable to get the licence key I received installed. An error occurred when assigning the specified licence key: The system Memory is not satisfied with the 32 GB of Maximum memory limit. Current with 80.00 GB of Memory. Is there now way around this? A quick google revealed that this is a global problem with no real answer or resolution. The only workaround is to remove the physical RAM chips, but as this is in going to be in production I dont want to do that as it would mean down time when I have to reinsert the memory

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• JFFS2 poor mount performance

  - by Marcin Polkowski

  I run multiple ARM boards with Debian Linux installed. Board is equipped with 512 MB of NAND memory. I've observed that after ~3 months of continuous run booting time increased significantly - it takes over 3 minutes to mount filesystem (JFFS2). System was using about 35% of available storage so I’ve removed unnecessary files (got to ~18%) but this didn't change anything. Then I realized that my software produces directories that are left empty so I’ve removed ~500 empty and unnecessary dirs. This didn’t help either. After system is started I see JFFS2 garbage collector (jffs2_gcd_mtd4) running and occupying over 90% of CPU. Now my question: is there a way to „optimize” JFFS2 filesystem for better performance - faster booting (my system have limited timid to boot up)? It would be great if this optimization could be done remotely - I have no physical access to boards.

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• Move the ESXi service console from eth0 to eth1.123

  - by Mircea Vutcovici

  I have an VMware ESXi 4.0.0 with 2 physical network cards. First one, eth0, has only the Service Console and the other one, eth1, is a trunk with all VLANs (including the management VLAN used by the Service Console). I would like to free eth0 port to be able to connect a network storage and I would like to move the management IP from eth0 to eth1/VLAN123. Can I do this remotely? Is it possible from vSphere client? Should I do it from the ESXi console?

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• No method 'get' on backbone model save

  - by user888734

  I'm using backbone for a reasonably complicated form. I have a number of nested models, and have been computing other variables in the parent model like so: // INSIDE PARENT MODEL computedValue: function () { var value = this.get('childModel').get('childModelProperty'); return value; } This seems to work fine for keeping my UI in sync, but as soon as I call .save() on the parent model, I get: Uncaught TypeError: Object #<Object> has no method 'get' It seems that the child model kind of temporarily stops responding. Am I doing something inherently wrong? EDIT: The stack trace is: Uncaught TypeError: Object #<Object> has no method 'get' publish.js:90 Backbone.Model.extend.neutralDivisionComputer publish.js:90 Backbone.Model.extend.setNeutralComputed publish.js:39 Backbone.Events.trigger backbone.js:163 _.extend.change backbone.js:473 _.extend.set backbone.js:314 _.extend.save.options.success backbone.js:385 f.Callbacks.o jquery.min.js:2 f.Callbacks.p.fireWith jquery.min.js:2 w jquery.min.js:4 f.support.ajax.f.ajaxTransport.send.d

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• How to disable 3G USB Modem internal storage from being loaded by linux kernel?

  - by Krystian

  Hi, I've got a problem with my 3G modem [Huawei E122]. It has internal storage and kernel assigns a device [/dev/sdX] to it. Because of that, every second time my machine will not boot - kernel panic - as my usb hdd gets assigned /dev/sdb instead of /dev/sda. I cannot use LABEL nor UUID in root= kernel parameter, as it is only available when using initrd, and I can't use it - I am using Debian on my router - mips architecture machine. I have to prevent this from happening, as my router has to start everyday and I have to be sure it works ok. I don't have physical access to restart it when something goes wrong. I don't use my modem internal storage, there's no SD card inserted. However kernel detects the reader and loads it. I can not prevent loading od usb drivers since my hdd is on USB as well. I will appreciate any ideas.

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• VMware postfix server drops connection

  - by nicoX

  Our physical server godzilla forwards mails to our virtuall VMware server b4. They are on the same net. Often connection drops, we can't ping godzilla with our b4. That means mails from godzilla won't reach b4 and the mails will be in handed into the mailq. Sometimes it takes some hours and the issue will auto fix itself, b4 will wake up and the mail will be delivered. Another thing if we remotely ssh into the b4, the b4 will wake up and and receive any mailq mails from godzilla and deliver them. netadmin@b4:/var/log$ arp -a ? (192.168.209.80) at 00:1E:C9:AE:79:9D [ether] on eth0 root@godzilla:/usr/local/bin# arp -a ? (192.168.209.20) at 00:50:56:91:7d:b2 [ether] on eth0

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