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• perfmon reporting higher IOPs than possible?

  - by BlueToast

  We created a monitoring report for IOPs on performance counters using Disk reads/sec and Disk writes/sec on four servers (physical boxes, no virtualization) that have 4x 15k 146GB SAS drives in RAID10 per server, set to check and record data every 1 second, and logged for 24 hours before stopping reports. These are the results we got: Server1 Maximum disk reads/sec: 4249.437 Maximum disk writes/sec: 4178.946 Server2 Maximum disk reads/sec: 2550.140 Maximum disk writes/sec: 5177.821 Server3 Maximum disk reads/sec: 1903.300 Maximum disk writes/sec: 5299.036 Server4 Maximum disk reads/sec: 8453.572 Maximum disk writes/sec: 11584.653 The average disk reads and writes per second were generally low. I.e. for one particular server it was like average 33 writes/sec, but when monitoring in real-time it would often spike up to several hundreds and also sometimes into the thousands. Could someone explain to me why these numbers are significantly higher than theoretical calculations assuming each drive can do 180 IOPs? Additional details (RAID card): HP Smart Array P410i, Total cache size of 1GB, Write cache is disabled, Array accelerator cache ratio is 25% read and 75% write

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• Encryption of external HDD -- accessible from windows without installation

  - by Rainer

  I would like to use encryption on my external HDD but I would like to be able to access the encrypted data from Windows as well. As suggested in other questions, TrueCrypt is one option here, or I am using momentarily encfs, which is not available for Windows. But my question goes further: I would like to be able to access the encrypted partition from Windows without installation as I will be using it from different Windows machines for which I have no administrator access. My main OS is Linux and I have full root access to that computer. Is there a full disk or file based encryption which I can use cross platform and which does not require installation under Windows? ADDITION: It seems that TrueCrypt provides a portable mode which fulfills my requirements partly: http://www.truecrypt.org/docs/?s=truecrypt-portable, but still the TrueCrypt driver needs to be installed by an administrator... pitty Thanks

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• How to interpret IOZone results?

  - by homer5439

  Here are the resuts of running IOZone on an ext3 filesystem on an LVM volume residing on a SAN LUN (it was ran with 5 parallel processes). "Throughput report Y-axis is type of test X-axis is number of processes" "Record size = 4 Kbytes " "Output is in Kbytes/sec" " Initial write " 81628.55 " Rewrite " 83354.72 " Read " 115595.02 " Re-read " 119306.09 " Reverse Read " 47684.20 " Stride read " 10011.09 " Random read " 16751.27 " Mixed workload " 5659.77 " Random write " 1661.85 " Pwrite " 36030.83 Now this is all nice and dandy, but my question is: how do I know whether the values are as good as they could be or there is something to tweak (and if so, what?) The actual usage I will have for that Logical Volume is to act as virtual disk for a VM.

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• Why am I seeing excessive disk activity when installing applications?

  - by Kev

  I'm running Windows 7 Ultimate 64 bit on a Dell Vostro 1720 with 8GB of RAM, 7200RPM Disk, 2.53 GHz Core2Duo (Windows 7 64 bit is a supported option and the laptop came with the OS pre-installed). I'm noticing some fairly excessive disk activity when running installers. For example the Visual Studio 2010 RC installer constantly accessed the disk for ~10 minutes. It was so excessive that I was unable to use the machine until this ceased. Today I installed Trillian Astra 4.1 for Windows (latest build from the website). Again when I ran the installer I was pretty much locked out of the machine until the disk activity calmed down. In both cases when I eventually managed to launch task manager I could see that the CPU was sitting at around 5% to 7% utilisation whilst this was going on. All other disk related activity is fine, the machine is snappy and applications launch without delay. It's just when I run an installer I see this odd behaviour. Why would this be?

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• Is Software Raid1 Using mdadm with a Local Hard Disk and GNDB Possible?

  - by Travis

  I have multiple webservers which use many small files to created dynamic web pages. Caching the web pages isn't an option. The webserver also performs writes so I need a synchronous filesystem. I'm looking to maximise performance as it's my understanding that small files is the weakness (to varying degreess) of a cluster filesystem over ethernet. Currently I'm using Centos 5.5, 64 bit. Since it's only about 300MB of data, I'm looking at mdadm using RAID-1 with the GNBD and a local hard disk using the "--write-mostly" option so the reads are done using the local hard disk. Is this possible? If so, is there any advantage to making it a tmpfs disk instead of a local hard disk? Or will the files on the local hard disk just get cached in RAM anyway so I won't see a performance gain by using tmpfs, assuming there's enough RAM available?

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• Average mail quota usage: tricks to implement unlimited email quota.

  - by Marco Demaio

  I suppose that hosters who provides unlimited mail quota are only claiming it unlimited, and hope that they won't run out of disk space. Correct me if I'm wrong. In order to do such trick they will have probably to calculate the average real quota used by the average user. Let's say on a 100 GB space hosting I offer to 20 x 1GB emails, obviously if all user fill their mail my server would stop working cause they would require 200 GB, but I think I can expect this trick to work cause it will never happen (or it's extermly unprobable) that all user fills up all their mails. But the QUESTTIONS are: What's the average email usage? Can we say that a user normally fills up 1/2 or 1/3 of the quota you provide him? Thanks to any answers/suggetions you might provide.

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• How do I know if my disks are being hit with too many I/O reads or writes or both?

  - by Mark F

  I know a bit about disk I/O and bottlenecks relating to this especially when relating to databases. How do I really know what the max I/O numbers will be for my disks? What metric might be available to me for working out roughly (but needs to be a good approximation) of how much capacity (if you will) have I got left available in I/O. I've seen it before where things are bubbling along nicely and then all of a sudden, everything screams to a halt, and it ends up being an I/O bound problem. Is there a better way to predict when I/O is reaching its limits? This article was interesting but not giving the answer I desire. So, is my best bet surrounding just looking at 'CPU I/O WAIT'? There must be a more reactive method than this.

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• Phantom Local Disks appearing in my drive list

  - by Paul

  I seem to have several phantom Local Disks mapped to different letters that are of 0 bytes in size. Strangely, they do not show up when I view my drives through Windows Explorer. But if I open an application such as ACDSee Pro or MS Word and then go to open a file I can see all these Local Disks mapped to different letters. This means when I plug in my external hard disk it ends up mapped to letter R instead of its usual G which messes up any programs I have pointing to it by default. How did they get there and more importantly, how do I get rid of them? I'm on a Window 7 Home Premium 32 bit machine.

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• Is it normal for a SAS drive to have a few bad blocks, or should I replace my drive ASAP?

  - by Nate

  I have a drive—part of a RAID 1 mirror—that has two bad blocks. Adaptec Storage Manger e-mailed me when it detected the blocks. It shows 4 medium errors for that drive, but state is still “optimal”. This is my first time using Adaptec RAID controllers. I don’t know if an occasional bad block is normal, or if I should immediately replace that drive. Update: The drive failed later the same day! The disk subsystem is: Adaptec 6405 with ZMM (2) Seagate near-line SAS drives (ST31000424SS) The other drive hasn’t reported any bad blocks yet. I am running a consistency check.

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• Xen find VBD id for physical disks

  - by Joe

  I'm starting a xen domU using xm create config.cfg. Within the config file are a number of physical block devices (LVs) which are added to the guest and can be accessed fine when it boots. However, at a point in the future I need to be able to hot unplug one of these disks using the xm block-detach command. This command, however, requires the vbd id of the device to be detached and I can't find a way to find the device id for a particular disk 'plugged in' at start up. Any help is much appreciated!

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• USB Drive cannot detect in Windows 7

  - by Perdana Putra

  Have you ever plugged in a USB drive or any external device with a hard drive and wondered why you cannot see it in My Computer? I often have, I believe my USB is not broke .. because if I plugin the USB to another computer could be seen / detected. I tried following this tutorial http://www.howtogeek.com/howto/22251/find-your-missing-usb-drive-in-windows-7-vista/ but I am afraid of going wrong, and caused my data is lost. is there any easy way around this problem? many thank's for your attentions Guys ..

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• Is it possible to put only the boot partition on a usb stick?

  - by Steve V.

  I've been looking at system encryption with ArchLinux and i think I have it pretty much figured out but I have a question about the /boot partition. Once the system is booted up is it possible to unmount the /boot partition and allow the system to continue to run? My thought was to install /boot to a USB stick since it can't be left encrypted and then boot from the USB stick which would boot up the encrypted hard disk. Then I can take the USB key out and just use the system as normal. The reason I want to do this is because if an attacker was able to get physical access to the machine they could modify the /boot partition with a keystroke logger and steal the key and if they already had a copy of the encrypted data they could just sit back and wait for the key. I guess I could come up with a system of verifying that the boot has been untouched at each startup. Has this been done before? Any guidance for implementing it on my own?

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• Will UUID be the same if a disk moved from one machine to another?

  - by Sunry

  While in Linux every disk got a UUID. I just wondering will the UUID be the same if I moved the same disk from one Linux box to another? Is it the same UUID in different machines with the same disk? Or for a disk the UUID will change with attached machine? Also a similar question: Will the UUID be the same after Linux distribution reinstalled in the same machine with the same disk? For example: First is CentOS 5, then reinstalled it to CentOS 6.

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• Storage sizing for virtual machines

  - by njo

  I am currently doing research to determine the consolidation ratio my company could expect should we start using a virtualization platform. I find myself continually running into a dead end when researching how to translate observed performance (weeks of perfmon data) to hdd array requirements for a virtualization server. I am familiar with the concept of IOPs, but they seem to be an overly simplistic measurement that fails to take into account cache, write combining, etc. Is there a seminal work on storage array performance analysis that I'm missing? This seems like an area where hearsay and 'black magic' have taken over for cold, hard fact.

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• Windows always logs in to temporary profile (thinks it is in D while it is in C)

  - by asdf

  I have Windows on C: Disk 0 Partition 1 When I start it works fine until the login screen. When I log in, it starts to display "preparing your desktop.." and logs in to a temporary profile. I have to run explorer.exe manually then using task manager. If I execute %SystemRoot% it tells me that Windows could not find D:\Windows. (while Windows is in C:) I have no such drive as D then why Windows is thinking it is in D? I've tried this Bootmanager is missing but it did not work. Bootrec /ScanOS from Windows setup gives me Total identified Windows installations: 0 Also note that Windows Setup correctly thinks windows is installed on C but Windows itself thinks it is on D.

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• Should I store my code/projects on my SSD or my secondary drive?

  - by user37467

  I just got a new box. It has an SSD for the primary drive, and a 1TB SATA for the secondary drive. I'm going to run windows and my binaries on the SSD and keep all my downloads/documents/music/etc on the secondary drive. My question is should I also keep my Visual Studio Projects and code on the SSD or keep them on the secondary drive? The faster SSD would presumably be better for compiling and indexed searches, but would it be better to keep it on the 2nd drive for a more parallel disk IO situation?

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• swapon --all --verbose : 'read swap header failed: Invalid argument'

  - by user66088

  Recently ran through EnableHibernateWithEncryptedSwap and ran the following command: swapon --all --verbose and received: 'read swap header failed: Invalid argument' How do I fix this? Here's some more pertinent output... Output of sudo fdisk -l: Disk /dev/sda: 80.0 GB, 80026361856 bytes 255 heads, 63 sectors/track, 9729 cylinders, total 156301488 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00006d20 Device Boot Start End Blocks Id System /dev/sda1 * 2048 499711 248832 83 Linux /dev/sda2 501758 156301311 77899777 5 Extended /dev/sda5 501760 156301311 77899776 8e Linux LVM Disk /dev/mapper/ubuntu--t10194-root: 75.5 GB, 75539415040 bytes 255 heads, 63 sectors/track, 9183 cylinders, total 147537920 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/mapper/ubuntu--t10194-root doesn't contain a valid partition table Disk /dev/mapper/ubuntu--t10194-swap_1: 4227 MB, 4227858432 bytes 255 heads, 63 sectors/track, 514 cylinders, total 8257536 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x08040000 Disk /dev/mapper/ubuntu--t10194-swap_1 doesn't contain a valid partition table Disk /dev/mapper/cryptswap1: 4225 MB, 4225761280 bytes 255 heads, 63 sectors/track, 513 cylinders, total 8253440 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xd2236983 Disk /dev/mapper/cryptswap1 doesn't contain a valid partition table Thanks for any and ALL help!

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• Optimizing sorting container of objects with heap-allocated buffers - how to avoid hard-copying buff

  - by Kache4

  I was making sure I knew how to do the op= and copy constructor correctly in order to sort() properly, so I wrote up a test case. After getting it to work, I realized that the op= was hard-copying all the data_. I figure if I wanted to sort a container with this structure (its elements have heap allocated char buffer arrays), it'd be faster to just swap the pointers around. Is there a way to do that? Would I have to write my own sort/swap function? #include <deque> //#include <string> //#include <utility> //#include <cstdlib> #include <cstring> #include <iostream> //#include <algorithm> // I use sort(), so why does this still compile when commented out? #include <boost/filesystem.hpp> #include <boost/foreach.hpp> using namespace std; namespace fs = boost::filesystem; class Page { public: // constructor Page(const char* path, const char* data, int size) : path_(fs::path(path)), size_(size), data_(new char[size]) { // cout << "Creating Page..." << endl; strncpy(data_, data, size); // cout << "done creating Page..." << endl; } // copy constructor Page(const Page& other) : path_(fs::path(other.path())), size_(other.size()), data_(new char[other.size()]) { // cout << "Copying Page..." << endl; strncpy(data_, other.data(), size_); // cout << "done copying Page..." << endl; } // destructor ~Page() { delete[] data_; } // accessors const fs::path& path() const { return path_; } const char* data() const { return data_; } int size() const { return size_; } // operators Page& operator = (const Page& other) { if (this == &other) return *this; char* newImage = new char[other.size()]; strncpy(newImage, other.data(), other.size()); delete[] data_; data_ = newImage; path_ = fs::path(other.path()); size_ = other.size(); return *this; } bool operator < (const Page& other) const { return path_ < other.path(); } private: fs::path path_; int size_; char* data_; }; class Book { public: Book(const char* path) : path_(fs::path(path)) { cout << "Creating Book..." << endl; cout << "pushing back #1" << endl; pages_.push_back(Page("image1.jpg", "firstImageData", 14)); cout << "pushing back #3" << endl; pages_.push_back(Page("image3.jpg", "thirdImageData", 14)); cout << "pushing back #2" << endl; pages_.push_back(Page("image2.jpg", "secondImageData", 15)); cout << "testing operator <" << endl; cout << pages_[0].path().string() << (pages_[0] < pages_[1]? " < " : " > ") << pages_[1].path().string() << endl; cout << pages_[1].path().string() << (pages_[1] < pages_[2]? " < " : " > ") << pages_[2].path().string() << endl; cout << pages_[0].path().string() << (pages_[0] < pages_[2]? " < " : " > ") << pages_[2].path().string() << endl; cout << "sorting" << endl; BOOST_FOREACH (Page p, pages_) cout << p.path().string() << endl; sort(pages_.begin(), pages_.end()); cout << "done sorting\n"; BOOST_FOREACH (Page p, pages_) cout << p.path().string() << endl; cout << "checking datas" << endl; BOOST_FOREACH (Page p, pages_) { char data[p.size() + 1]; strncpy((char*)&data, p.data(), p.size()); data[p.size()] = '\0'; cout << p.path().string() << " " << data << endl; } cout << "done Creating Book" << endl; } private: deque<Page> pages_; fs::path path_; }; int main() { Book* book = new Book("/some/path/"); }

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• How can I keep a folder synchronized to an external USB hard drive in Ubuntu?

  - by Cesar

  I have a growing music collection which I manually keep in sync with an external USB drive. Sometimes I edit their ID3 tags, add or delete a file in either the hard drive or the USB drive, and I would like to keep those changes synchronized between both. Does Ubuntu has something available that would help me with this scenario? Preferably something easy to use with a UI. Update: To clarify my question, changes may happen on both the local hard drive or the USB drive, so the sync process must be on both directions.

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• How do I mount a USB floppy disk drive?

  - by Jocky B

  I have tried to mount my usb floppy disk drive in 11.04 Natty. So far I have managed to use the udisks --mount/dev/sdf command in terminal, but get a message that I have not stated a filetype john@john-desktop:~$ udisks --mount /dev/sdf Mount failed: Error mounting: mount: you must specify the filesystem type This is the result I get when trying to mount the usb floppy disk drive. Anyone know how to proceed?

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• How many disk should I use to meed the capacity and IOPS need?

  - by facebook-100005613813158

  An application needs 1.6 TB of storage capacity and performs 1000 IOPS. How many disks are required to meet the application requirement and offer acceptable response time? The disk specifications are as follows: - Drive capacity = 100 GB - 15K RPM - Each disk can perform 50 IOPS 4 candidate , 10,12,16,20, which one is the most likely answer? in my opinion,16 disks can only meet the capacity need ,but cannot meet the IOPS need, so ,the right answer should be 20 disks?right?

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• How can i turn a virtualbox disk partion to be my main boot system? (read description)

  - by user75975

  I recently had windows xp installed on my pc and chose to try ubuntu but i did a full install with ubuntu. I luckily chose to create a backup windows iso before the install and now want to reinstall windows but i couldnt find a sufficient program to mount the iso to my cd disk. My question is how can i burn the disk using VirtualBox or even how can i transform a virtual box partion to my main OS system?? thx in advance

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• Search Engine Optimization - Why it is So Hard to Get More Rankings When You Are Starting Out?

  One of the biggest frustrations that a lot of people have is the fact that getting more rankings to their site when they are starting out is really hard. In this article I want to show you exactly why it is so hard and show you what you can do about it to make it easier.

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• Snow Leopard doesn't repair permissions, despite showing / saying its fixed them?

  - by Jules

  Sometime ago, I used carbon copy as I was replacing my hard drive in my Mac Mini running Snow Leopard. Afterwards, on my new drive I had some permission problems. I've tried several times running a repair permissions / repair disk from disk util. It shows that there are problems and I think it says its correceted the problems. However the problems remain, what can I do to fix them ? It doesn't seem to cause me any problems, that I can tell EDIT Repairing permissions for “Macintosh HD” Permissions differ on "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/Italian.lproj/UIAgent.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/Italian.lproj/UIAgent.nib". Permissions differ on "System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Classes/jconsole.jar", should be -rw-r--r-- , they are lrwxr-xr-x . Repaired "System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Classes/jconsole.jar". User differs on "System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home/lib", should be 95, user is 0. Repaired "System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home/lib". User differs on "System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Libraries", should be 95, user is 0. Repaired "System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Libraries". Permissions differ on "System/Library/Frameworks/JavaVM.framework/Versions/A/Resources/Deploy.bundle/Contents/Home/lib/security/cacerts", should be -rw-r--r-- , they are lrwxr-xr-x . Repaired "System/Library/Frameworks/JavaVM.framework/Versions/A/Resources/Deploy.bundle/Contents/Home/lib/security/cacerts". Permissions differ on "System/Library/Frameworks/JavaVM.framework/Versions/A/Resources/Deploy.bundle/Contents/Resources/Java/deploy.jar", should be -rw-r--r-- , they are lrwxr-xr-x . Repaired "System/Library/Frameworks/JavaVM.framework/Versions/A/Resources/Deploy.bundle/Contents/Resources/Java/deploy.jar". Permissions differ on "System/Library/Frameworks/JavaVM.framework/Versions/A/Resources/Deploy.bundle/Contents/Resources/Java/libdeploy.jnilib", should be -rwxr-xr-x , they are lrwxr-xr-x . Repaired "System/Library/Frameworks/JavaVM.framework/Versions/A/Resources/Deploy.bundle/Contents/Resources/Java/libdeploy.jnilib". Permissions differ on "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreenLeopard386.app/Contents/Resources/Italian.lproj/MainMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreenLeopard386.app/Contents/Resources/Italian.lproj/MainMenu.nib". Permissions differ on "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/zh_TW.lproj/RemoteDesktopMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/zh_TW.lproj/RemoteDesktopMenu.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/zh_TW.lproj/UIAgent.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/zh_TW.lproj/UIAgent.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/zh_TW.lproj/MainMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/zh_TW.lproj/MainMenu.nib". Permissions differ on "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/zh_CN.lproj/RemoteDesktopMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/zh_CN.lproj/RemoteDesktopMenu.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/zh_CN.lproj/UIAgent.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/zh_CN.lproj/UIAgent.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/zh_CN.lproj/MainMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/zh_CN.lproj/MainMenu.nib". Permissions differ on "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/ko.lproj/RemoteDesktopMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/ko.lproj/RemoteDesktopMenu.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/ko.lproj/UIAgent.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/ko.lproj/UIAgent.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/ko.lproj/MainMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/ko.lproj/MainMenu.nib". Permissions differ on "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/Dutch.lproj/RemoteDesktopMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/Dutch.lproj/RemoteDesktopMenu.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/Dutch.lproj/UIAgent.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/Dutch.lproj/UIAgent.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/Dutch.lproj/MainMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/Dutch.lproj/MainMenu.nib". Permissions differ on "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/Italian.lproj/RemoteDesktopMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/Italian.lproj/RemoteDesktopMenu.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/Italian.lproj/MainMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/Italian.lproj/MainMenu.nib". Permissions differ on "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/Spanish.lproj/RemoteDesktopMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/Spanish.lproj/RemoteDesktopMenu.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/Spanish.lproj/UIAgent.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/Spanish.lproj/UIAgent.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/Spanish.lproj/MainMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/Spanish.lproj/MainMenu.nib". Permissions differ on "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/French.lproj/RemoteDesktopMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/French.lproj/RemoteDesktopMenu.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/French.lproj/UIAgent.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/French.lproj/UIAgent.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/French.lproj/MainMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/French.lproj/MainMenu.nib". Permissions differ on "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/German.lproj/RemoteDesktopMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/German.lproj/RemoteDesktopMenu.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/German.lproj/UIAgent.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/German.lproj/UIAgent.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/German.lproj/MainMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/German.lproj/MainMenu.nib". Permissions differ on "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/Japanese.lproj/RemoteDesktopMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/Japanese.lproj/RemoteDesktopMenu.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/Japanese.lproj/UIAgent.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/Japanese.lproj/UIAgent.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/Japanese.lproj/MainMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/Japanese.lproj/MainMenu.nib". Permissions differ on "System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Resources/JavaPluginCocoa.bundle/Contents/Resources/Java/deploy.jar", should be -rw-r--r-- , they are lrwxr-xr-x . Repaired "System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Resources/JavaPluginCocoa.bundle/Contents/Resources/Java/deploy.jar". Permissions differ on "System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Resources/JavaPluginCocoa.bundle/Contents/Resources/Java/libdeploy.jnilib", should be -rwxr-xr-x , they are lrwxr-xr-x . Repaired "System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Resources/JavaPluginCocoa.bundle/Contents/Resources/Java/libdeploy.jnilib". Permissions differ on "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/English.lproj/RemoteDesktopMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/Menu Extras/RemoteDesktop.menu/Contents/Resources/English.lproj/RemoteDesktopMenu.nib". Warning: SUID file "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent" has been modified and will not be repaired. Permissions differ on "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/English.lproj/UIAgent.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Support/Remote Desktop Message.app/Contents/Resources/English.lproj/UIAgent.nib". Permissions differ on "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/English.lproj/MainMenu.nib", should be drwxr-xr-x , they are -rwxr-xr-x . Repaired "System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Support/LockScreen.app/Contents/Resources/English.lproj/MainMenu.nib". Group differs on "private/var/log/kernel.log", should be 80, group is 0. Permissions differ on "private/var/log/kernel.log", should be -rw-r----- , they are -rw-r--r-- . Repaired "private/var/log/kernel.log". Group differs on "private/var/log/secure.log", should be 80, group is 0. Permissions differ on "private/var/log/secure.log", should be -rw-r----- , they are -rw-r--r-- . Repaired "private/var/log/secure.log". Group differs on "private/var/log/system.log", should be 80, group is 0. Permissions differ on "private/var/log/system.log", should be -rw-r----- , they are -rw-r--r-- . Repaired "private/var/log/system.log". Permissions repair complete

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• To clone or to automate a system installation?

  - by Shtééf

  Let's say you're setting up a cluster of servers performing the same task. Or say you're just setting up a bunch of different servers, but you expect to use a base configuration on all of your servers. Would it be better practice to create a base image and clone it, or to automate the installation and configuration? I occasionally end up in this argument with my boss, in situations where we're time-pressed. When he sees me struggle with perfecting the automation, his suggestion is often to clone the entire disk to the other machines. But my instinct has always been to avoid cloning. This is mostly from an Ubuntu perspective, but the question is fairly general. My reasons for avoiding cloning are: On a typical install, even if it's fresh, there are already several unique identifiers installed: filesystem UUIDs, SSH host keys, among others. These would have to be regenerated. Network needs to be reconfigured for each clone. This would need to be done off-line, of course, or the settings will conflict with other machines on the network. On the other hand, some of the cloning advantages are quite clear as well: (Initially?) less effort required than automating configuration. Tools exist to quickly address (some) of the above disadvantages. (I can see right through my own bias there.)

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