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• LVM2 vs MDADM performance

  - by archer

  I've used MDADM + LVM2 on many boxes for quite a while. MDADM was serving for both RAID0 and RAID1 arrays, while LVM2 where used for logical volumes on top of MDADM. Recently I've found that LVM2 could be used w/o MDADM (thus minus one layer, as the result - less overhead) for both mirroring and stripping. However, some guys claims that READ PERFORMANCE on LVM2 for mirrored array is not that fast as for LVM2 (linear) on top of MDADM (RAID1) as LVM2 does not read from 2+ devices at a time, but use 2nd and higher devices in case of 1st device failure. MDADM reads from 2 devices at a time (even in mirrored mode). Who could confirm that?

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• How to modify JSSE / How to do custom build

  - by Steffen Heil

  Hi I have a special requirement for one of my applications where I need the servers nounce (Handshaker.srv_random) when verifying the client certificate. Yet JSSEs X509TrustManager only passes me the certificate, no other information of the handshake. I have located the place, where checkClientTrusted is called (inside ServerHandshaker) and it would be easy to extend it to also allow some X509CustomTrustManager to be called with all required information. Yet this would require me to recompile JSSE... I also found jsse sources in openjdk. Now for my questions: What is the easiest way to compile jsse from openjdk? Can the resulting jsse.jar be used as a replacement for the (original) sun jre as a replacement for the included jsse.jar? Is there another (more standard compliant) way to archive what I am trying to do? I did not find a hook to use my own handshaker... Regards, Steffen

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• VMWare vmfs vs NFS datastore with vmdk?

  - by CarpeNoctem

  I want to add a new harddisk to an existing VM and want the best performance possible. The new hard disk will exist on an NFS datastore. Currently I did the following: Created new vmdk on NFS datastore Created new lvm partition using fdisk Create new physical volume, volume group, and logical volume (2TB) Created ext3 partition on logical volume Is there a better way to do this? Should I be doing some vmware-ish file system instead?

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• windows 2008 server vs 2003 server

  - by Yves

  We're building a new network with 5 locations and 200 users and would like to know if we should be building it on 2008 or 2003 servers.

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• lighttpd VS Apache

  - by Tristan

  Hi, could you pelase tell me what's the difference (i never heard of lighttpd before) ? pro / cons ? and what would you pick for a website who have to deal with a lot of querys (like 20,000 min per day) ? Thanks

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• On Server Disk Storage VS SAN Storage

  - by Justin

  Hello, I am looking at buying three servers, and trying to figure out which storage solution makes the most sense in terms of performance and cost. Total budget is around: $10,000. OPTION 1: Dell servers with RAID 10 (4 Drives) each 7200RPM SAS 500GB, for a total capacity of 1TB. Each server is approx: $3000. Total storage then across all three servers is 3TB. OPTION 2: Same Dell servers with a cheap single drive no RAID for $2000 and go with a centralized SAN solution. The biggest problem is that I haven't been able to even find a SAN solution that is a reasonable price. Dell entry level storage servers are like $15,000. I am thinking just iSCSI, not fiber (too expensive). What do you guys recommend?

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• Difference between "Redirect permanent" vs. mod_rewrite

  - by Stefan Lasiewski

  This is an Apache httpd 2.2 server. We require that access to this webserver be encrypted by HTTPS. When web clients visit my site at http://www.example.org/$foo (port 80), I want to redirect their request to the HTTPS encrypted website at https://www.example.org/$foo . There seem to be two common ways to do this: First method uses the 'Redirect' directive from mod_alias: <VirtualHost *:80> Redirect permanent / https://www.example.org/ </VirtualHost> Second method uses mod_rewrite: <VirtualHost *:80> RewriteEngine On RewriteCond %{HTTPS} off RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} </VirtualHost> What is the difference between a "Redirect permanent" and the mod_rewrite stanza. Is one better then the other?

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• ZFS: Mirror vs. RAID-Z

  - by John Clayton

  I'm planning on building a file server using OpenSolaris and ZFS that will provide two primary services - be an iSCSI target for XenServer virtual machines & be a general home file server. The hardware I'm looking at includes 2x 4-port SATA controllers, 2x small boot drives (one on each controller), and 4x big drives for storage. This allows one free port per controller for upgrading the array down the road. Where I'm a little confused is how to setup the storage drives. For performance, mirroring appears to be king. I'm having a hard time seeing what the benefit would be of using RAIDZ over mirroring would be. With this setup I can see two options - two mirrored pools in one stripe, or RAIDZ2. Both should protect against 2 drive failures, and/or one controller failure...the only benefit of RAIDZ2 would be that any 2 drives could fail. The storage should be 50% of capacity in both cases, but the first should have much better performance, right? The other thing I'm trying to wrap my mind around is the benefit of mirrored arrays with more than two devices. For data integrity what, if any, would be the benefit of a RAIDZ over a three-way mirror? Since ZFS maintains file integrity what does RAIDZ bring to the table...doesn't ZFS's integrity checks negate the value of RAIDZ's parity?

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• Dell R510 vs R710

  - by AX1

  Hello, the Dell R510 and R710 can both hold regular configurations (e.g. X5650, 24 GB RAM, etc.) and these usually come out to about the same price. Is there a particular reason why one would choose the R510 over the R710 or vice versa? There really appears a lack of differentiating factors. The only 'major' factor I found, which doesn't apply to me though, is that the R510 can hold up to 12 3.5in HDDs while the R710 (which is slightly more expensive) can only hold up to 6 3.5in HDDs. Maybe you guys have some input and bought either of these machines (or both) to shed some light on other differences and why someone should choose one over the other as the pricing is pretty much the same with my configuration. Thanks!

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• 64 bit vs 32 bit

  - by user53864

  When I was doing my course MCSA, I'm taught the following: With a 32-bit processor only 32-bit operating system can be installed. with a 64-bit processor both 32-bit & 64-bit operating system can be installed It's said 64-bit os cannot be installed on a 32-bit processor. I just want to make sure the above points because recently I'm asked to installed Windows Server 2008 R2 Enterprize and while installation it showed only x64 and it simply installed it. I was thinking all the computers in my office having a 32-bit processor. If so how it could be possible to install a x64 bit os on a 32-bit processor? or I'm wrong with the 1st point or the processor may be of 64-bit(I don't know how to check). I'm confused... One thing what I know the benefits of 64-bit over 32-bit is faster operation. If anyone could tell me other benefits, it could be helpful for me. Thanks!

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• 64 bit vs 32 bit

  - by user51737

  When I was doing my course MCSA, I'm taught the following: With a 32-bit processor only 32-bit operating system can be installed. with a 64-bit processor both 32-bit & 64-bit operating system can be installed It's said 64-bit os cannot be installed on a 32-bit processor. I just want to make sure the above points because recently I'm asked to installed Windows Server 2008 R2 Enterprize and while installation it showed only x64 and it simply installed it. I was thinking all the computers in my office having a 32-bit processor. If so how it could be possible to install a x64 bit os on a 32-bit processor? or I'm wrong with the 1st point or the processor may be of 64-bit(I don't know how to check). I'm confused... One thing what I know the benefits of 64-bit over 32-bit is faster operation. If anyone could tell me other benefits, it could be helpful for me. Thanks!

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• Windows 7 Disk Management Spanned Volume vs Striped Volume

  - by Kairan

  Im looking for a reason why a person would use a Spanned volume rather than a Striped volume? If my understanding is correct Striped: Faster read/write speed than spanned, but I "assume" more wear+tear Spanned: No speed benefit like striped, but data is written sequentially and fills up Drive1 before filling up Drive2, so it saves on wear+tear Beyond that Im not sure if there is any other deciding factor on which to use. Definition found below: A striped volume uses the free space on more than one physical hard disk to create a bigger volume. Unlike a spanned volume, a striped volume writes across all volumes in the stripe in small blocks, distributing the load across the disks in the volume. The portions of disk used to create the volume need to be the same size; the size of the smallest free space included in the striped volume will determine.

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• Build associative array based on values of another associative array

  - by macek

  I'm looking for an elegant way to turn this array: Array ( [foo] => 1 [bar] => 1 [zim] => 3 [dib] => 6 [gir] => 1 [gaz] => 3 ) Into this array: Array ( [1] => Array ( foo, bar, gir ), [3] => Array ( zim, gaz ), [6] => Array ( dib ) ) Note:, there is no relationship between the keys or values. They are completely arbitrary and used as examples only. The resulting array should be an associative array grouped by the values of the input array. Thanks!

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• Copying files SSH vs sFTP

  - by jackquack

  I'm a bit of a unix noob, but this question seems super basic, yet I can't find an answer anywhere. Basically, to my knowledge, sFTP is just FTP over ssh. So, why can't I drag and drop files from one folder to another on the server side like I can on ssh. Why when I want to unzip a .tar in a server folder, does it first want to copy it to my machine and then back? Why can't it just unzip like it can when I'm using the command line. I know that when I use the command line it is using the resources of the remote machine, but why can't sFTP do that too? Is there a way to execute commands which I would normally do over SSH, but in a gui? I'm tried mapping to the drive to my own machine, I've tried so many sFTP clients that it's silly. Is there another class of program that I just don't know of?

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• Reverse DNS does not match SMTP banner vs Reverse DNS mismatch

  - by MadBoy

  I have to make decision whether my Reverse DNS should match SMTP banner but Reverse DNS to DNS and vice versa stays different or vice versa. Which one to choose? I have an 2x Exchange 2010 server with one SMTP Sender with TMG 2010. TMG has 2 links connected so that we have 2 separate internet providers. The problem is I have no way to control TMG behavior on which link is used to send emails as it picks it randomly. I have 2 MX records: - mail.test.com which resolves to IP and IP resolves to mail.test.com - mail2.test.com which resolves to IP2 and IP2 resolves to mail.test.com This was done to prevent smtp banner issues but it provides problems with Reverse DNS if the server on the other side is eager enough to do comparison. But I've checked with Google and they also don't have that in perfect condition.

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• Using terminal vs KDE in linux?

  - by Ke

  Hi Im used to using nautilus within centos but have recently just got a VPS and quickly realising that using a KDE is unacceptable in this environment. Although I do find it so much quicker doing things like folder permissions in KDE rather than typing it all out in the terminal? Everyone I speak to says, use the terminal and I should learn this way as opposed to using the KDE, but theres certain things I just dont get How is it possible to make quick changes to scripts and viewing them in a browser etc , without a mouse or using KDE? and only using a terminal?? I am wondering how to develop websites just using the terminal??? How can it be quicker to type out/view permissions etc in the terminal when its instant and just a few clicks in the KDE? Any thoughts are much appreciated. I would love to understand the benefits but just cant seem to see them right now. Cheers Ke.

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• Windows Server 2008 Standard vs. Web

  - by Andreas

  I'm currently comparing Windows Server 2008 versions to see what to use. What i found is this, that might affect me: RAM: 32GB. (the same) Sockets: 4 (the same) Remote Desktop: 2 (the same) IIS: true (the same) Application Server: Only standard. I will run my server as a single CPU (4 core) 8GB RAM, 2x raid1 web-server running: IIS Asp.net .Net 4 Third part mail server. (Only for sending mail from my web-application) SQL Server Express (My data is not more then 10 GB) Some minor applications for import and export of data. I might use external load balancer if I install a second machine in the future. My question is if you see any reason for me to go for standard that is 4 x price compared to web. BR Andreas

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• Removable vs fixed mount points in Linux

  - by Dave

  What makes a mount point removable in Linux? I am using Gentoo Linux with Gnome 3.2, and I find it annoying that some of my drives (ex: /dev/sdb) appear as removable but not the others (ex: /dev/sdc, /dev/sdd). They are all in /etc/fstab, with the same options. They are all mounted properly at startup, they all work fine under my own folders /mnt/drive2 /mnt/drive3 /mnt/drive4. But only one of them (the first) appears in Nautilus (and in the Gnome 3 notification tray) as mountable/removable, not the others. Can I add options to my fstab to hide it? Or can I probe using udevadm or whatever? It looks strange to be able to remove/unmount fixed drives that I never need to unmount nor remove. Any pointer would be good, thanks.

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• Intel i7 vs Xeon quad core processor?

  - by jasondavis

  I know the Xeon processors have been around for a long time and are mostly used in servers but I am curious, why do people not use the xeon's in a high performance desktop? As far as I know about the best desktop processor out there now is the i7 line. The i7's and xeons are both quad-core processors, what is the main difference in these? I just saw that the mac pro's are using the quad core xeons instead of the i7's

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• apache rewrite debian vs windows

  - by user1079002

  I have simple rewrite rules as I just learned about them RewriteEngine On RewriteRule ^dl/(.*)/.*$ dl/$1/index.php [L] RewriteRule ^index.php$ upload.js [L] both are working on Windows for url localhost/upload/dl/mkdji/index.php, but on Debian works only second rule for url www.domain.com/index.php, but not for www.domain.com/dl/oksoks/index.php After dl is some random string. Obviously I'm missing something regarding directory depth, but don't know what. file htacces is in localhost/upload and root of domain.com folders. What am I missing here?

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• Windows 2008 CAL vs RDS CAL

  - by g8keepa82

  Looking at the Win2k8 licensing page here and it appears to me that if I want to have a server to accept Remote Desktop Connections from say 30 users concurrently, I would require: Windows 2008 Server License & Windows 2008 CAL Is this correct logic? Or would I require RDS CALs instead? Or would I actually require RDS CALs on top of that? From what I can gather the RDS CALs are only required if I was to use the additional RDS services like App-V, etc. This question may have been answered here before but just wanted to clarify. Can anyone help?

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• Denyhosts vs fail2ban vs iptables- best way to prevent brute force logons?

  - by spiffytech

  I'm setting up a LAMP server and need to prevent SSH/FTP/etc. brute-force logon attempts from succeeding. I've seen many recommendations for both denyhosts and fail2ban, but few comparisons of the two. I also read that an IPTables rule can fill the same function. Why would I choose one of these methods over another? How do people on serverfault handle this problem?

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• ASP.net 2.0 Gridview with Expanding Panel Rows -- How to build Panel "on the fly"

  - by jlrolin

  I'm currently building a Gridview that has expandable rows. Each row contains a dynamically created Panel of Form elements. Right now, I have a javascript function that expands (or in my case, makes visible) the panel when an Image is clicked on the Gridview row. My question is... is there a more efficient way of doing this. Instead of pulling all my data to begin with and building each new row as I Databind, is there a way to simple create the row with the Panel full of textboxes and dropdownlists on the fly when the user clicks the Expand button?" I'd like to limit the server calls by doing it that way instead of how I'm currently doing it, looping through every row and creating a new panel with form elements and inserting that into a row that is hidden.

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• bash vs sh | What is the difference

  - by Saif Bechan

  In using i see 2 types of code #!/usr/bin/sh and #!/user/bin/bash I have Googled this and the opinions vary a lot. The explanation I have seen on most websites is that sh is older than bash, and that there is no real difference. Does someone know the difference between these and can give a practical example when to use either one of them. I highly doubt that there is no real difference, because then having to things that do the exact same thing would be just

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• WAMP Server vs LAMP Server

  - by Rob A

  Hi All, Just wondering, I want to set up a basic web server at home. I run Windows (XP on the machine to be a server), however I also have Ubuntu on hand if I need to run that. Basically I was wondering if there are any large difference between WAMP servers and LAMP servers? I know the run virtually the same software, but does one perform better than the other? Are there hidden benefits of running it in Ubuntu instead of XP, or the other way around? I know its a basic question, but I havent done anything with Ubuntu, and Ive done about the same amount with web server-ing. Thanks!

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