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  • On Solaris, how do you mount a second zfs system disk for diagnostics?

    - by Matt Ball
    I've got two hard disks in my computer, and have installed Solaris 10u8 on the first and Opensolaris 2010.3 (dev onnv_134) on the second. Both systems uses ZFS and were independently created with a zpool name of 'rpool'. While running Solaris 10u8 on the first disk, how do I mount the second ZFS hard disk (at /dev/dsk/c1d1s0) on an arbitrary mount point (like /a) for diagnostics?

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  • Why do disk images hosted on a read-only HFS+ partition behave differently?

    - by deceze
    I have come across the following phenomenon and would like to know how leaky Windows' file system abstraction is or if there's something else involved. I partitioned the hard disk of my MacBook Pro and installed Windows 7 (64 bit). The Boot Camp driver package includes file system drivers that enable Windows to access the Mac OS HFS+ partition. It's read-only access, but it works. Now, I have some disk images of stuff I usually install, so I grabbed a copy of Daemon Tools to mount them. When I mount an image saved on the HFS+ partition, about two out of three installers on these disks (usually InstallShield) crash with all sorts of weird errors. Most are just gibberish that lead to all sorts of non-solutions on Google, one was "This application is not the right type for your computer, check if you need 32 or 64 bit versions." When moving the image files to another Windows 7 computer on the network and mounting them from the network share, they work fine. My question now is, why do applications behave differently depending on whether the read-only image file, which should be abstracted away through the read-only virtual Daemon Tools drive, is located on a read-only HFS+ partition or on a Windows network share? And I'll just roll this into the question as well since I was wondering: Does the file system of a network share matter? Does the client system need to understand the file system of the share host or is that abstracted away in SMB?

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  • Make a drive from one machine appear as a physical disk in another machine.

    - by Roberto Sebestyen
    I want to take a physical disk (or part of a disk) in one machine (call it machine-A) and I want to make it available in another machine (machine-B). But I don't want to map a network drive. I want it to appear in machine-B as a physical drive. Even though it is not a physical drive. The reason I want to do this is i want the ability to create shares in machine-B on that drive. Since I cannot do that on mapped drives, I need to use some utility that fools machine-B to think that it is a physical drive, and treat it as such. Both of these machines are windows server 2003. I heard about NFS, It sounds like what could be the solution to my problem. But isn't that a Linux/Unix protocol? What tools can I use to make this happen? Are there any open source solutions? I don't care what the solution is, as long as it achieves the end result, preferably open source solution though. Thanks for reading guys and gals!

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  • Combining FileStream and MemoryStream to avoid disk accesses/paging while receiving gigabytes of data?

    - by w128
    I'm receiving a file as a stream of byte[] data packets (total size isn't known in advance) that I need to store somewhere before processing it immediately after it's been received (I can't do the processing on the fly). Total received file size can vary from as small as 10 KB to over 4 GB. One option for storing the received data is to use a MemoryStream, i.e. a sequence of MemoryStream.Write(bufferReceived, 0, count) calls to store the received packets. This is very simple, but obviously will result in out of memory exception for large files. An alternative option is to use a FileStream, i.e. FileStream.Write(bufferReceived, 0, count). This way, no out of memory exceptions will occur, but what I'm unsure about is bad performance due to disk writes (which I don't want to occur as long as plenty of memory is still available) - I'd like to avoid disk access as much as possible, but I don't know of a way to control this. I did some testing and most of the time, there seems to be little performance difference between say 10 000 consecutive calls of MemoryStream.Write() vs FileStream.Write(), but a lot seems to depend on buffer size and the total amount of data in question (i.e the number of writes). Obviously, MemoryStream size reallocation is also a factor. Does it make sense to use a combination of MemoryStream and FileStream, i.e. write to memory stream by default, but once the total amount of data received is over e.g. 500 MB, write it to FileStream; then, read in chunks from both streams for processing the received data (first process 500 MB from the MemoryStream, dispose it, then read from FileStream)? Another solution is to use a custom memory stream implementation that doesn't require continuous address space for internal array allocation (i.e. a linked list of memory streams); this way, at least on 64-bit environments, out of memory exceptions should no longer be an issue. Con: extra work, more room for mistakes. So how do FileStream vs MemoryStream read/writes behave in terms of disk access and memory caching, i.e. data size/performance balance. I would expect that as long as enough RAM is available, FileStream would internally read/write from memory (cache) anyway, and virtual memory would take care of the rest. But I don't know how often FileStream will explicitly access a disk when being written to. Any help would be appreciated.

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  • Can I recover a non-system disk deleted during 2008 R2 setup?

    - by serialhobbyist
    I've done a truly stupid thing and 'deleted' the data disk on a Server 2008 R2 box. Can I recover it? If so, how? I was rebuilding the box because a motherboard change had broken things. I've built loads of boxes and was going through the standard stuff without much concentration. I got to the disk screen which normally displays the two paritions on the drive: the recovery one and the system one. As normal, I deleted the two things I saw. It was only when two lots of unallocated space didn't merge into one that the full horror of what I'd done hit me. Yes, I've got backups... of the stuff I have space to back up. The real irony is that, earlier in the day, I'd ordered to 1 TB disks to deal with the problem. So, anyway, I'd really like to get this partition back because it'll save me a lot of time. How can I do it?

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  • Is it possible (and how if it is) dump two concatenaded disks in a new disk using DD?

    - by pedromarce
    Hi, I have a Lacie enclosure that has a setup with 2 500gb disks configured as 1 drive of 1TB, the only partition created for the whole drive is HFS+ journaled, but the controller in the enclosure is gone and so the drive refuses to mount anymore. I have been able to remove those two disks from the enclosure and connect them using USB ports and a program called R-studio (Raid recovery program) check that the setup the controller in the enclosure was using was both disks concatenated (Not Striped). And so configuring that option in R-studio I could be able to get back all the information. But before I got a license for r-studio for just one use, I would rather buying a new 1TB disk and try to write all the information of those two disks in this new one. I can use Mac or linux machines to do it, and I think it should be ok use DD command in linux to concatenate those two drives into the new one in the right order to get it working again in the new disk and I will reformat the old ones, but I am not sure. So, is it possible in this scenario to write both disks into a new one using DD? Any hints how the command would look? Thanks,

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  • Can't shrink Windows Boot NTFS disk: ERROR(5): Could not map attribute 0x80 in inode, Input/output error

    - by arcyqwerty
    Ubuntu 12.04 LTS, all updates current as of 7/3/2012 gksudo gparted Shrink /dev/sda2 from 367GB to 307GB GParted 0.11.0 --enable-libparted-dmraid Libparted 2.3 Shrink /dev/sda2 from 367.00 GiB to 307.00 GiB 00:32:57 ( ERROR ) calibrate /dev/sda2 00:00:00 ( SUCCESS ) path: /dev/sda2 start: 20,484,096 end: 790,142,975 size: 769,658,880 (367.00 GiB) check file system on /dev/sda2 for errors and (if possible) fix them 00:00:53 ( SUCCESS ) ntfsresize -P -i -f -v /dev/sda2 ntfsresize v2012.1.15AR.1 (libntfs-3g) Device name : /dev/sda2 NTFS volume version: 3.1 Cluster size : 4096 bytes Current volume size: 394065338880 bytes (394066 MB) Current device size: 394065346560 bytes (394066 MB) Checking for bad sectors ... Checking filesystem consistency ... Accounting clusters ... Space in use : 327950 MB (83.2%) Collecting resizing constraints ... Estimating smallest shrunken size supported ... File feature Last used at By inode $MFT : 389998 MB 0 Multi-Record : 394061 MB 386464 $MFTMirr : 314823 MB 1 Compressed : 394064 MB 1019521 Sparse : 330887 MB 752454 Ordinary : 393297 MB 706060 You might resize at 327949758464 bytes or 327950 MB (freeing 66116 MB). Please make a test run using both the -n and -s options before real resizing! shrink file system 00:32:04 ( ERROR ) run simulation 00:32:04 ( ERROR ) ntfsresize -P --force --force /dev/sda2 -s 329640837119 --no-action ntfsresize v2012.1.15AR.1 (libntfs-3g) Device name : /dev/sda2 NTFS volume version: 3.1 Cluster size : 4096 bytes Current volume size: 394065338880 bytes (394066 MB) Current device size: 394065346560 bytes (394066 MB) New volume size : 329640829440 bytes (329641 MB) Checking filesystem consistency ... Accounting clusters ... Space in use : 327950 MB (83.2%) Collecting resizing constraints ... Needed relocations : 13300525 (54479 MB) Schedule chkdsk for NTFS consistency check at Windows boot time ... Resetting $LogFile ... (this might take a while) Relocating needed data ... Updating $BadClust file ... Updating $Bitmap file ... ERROR(5): Could not map attribute 0x80 in inode 1667593: Input/output error ======================================== Windows has run chkdsk successfully (on boot) several times now

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  • How to know my free disk space on web hosting server?

    - by Abu
    I have got some work from my friend for updating his website. Earlier his website was made by some other person and he used to maintain all the stuff. Now that developer has given only the ftp username and password to my friend. He asks me to update his website. But the problem is I don't know how to access the things for this particular web hosting account like knowing the available free space, accesing email account, etc. I asked him about website control panel but he says that he doesn't know about. Is there any other site/client program/control panel that I can use to manage that website. So can any one help me out?

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  • How to run Ubuntu fully in initramfs?

    - by miernik
    I have a machine with 10 GB of RAM, and I would like to run Ubuntu on it (Debian also OK if its easier), fully in RAM in such a way: I boot from a compressed image on an USB flash disk, that is uncompressed into RAM, and then I can remove the disk from the USB slot, and use the system only with RAM, without any permanent disk. Whenever I make any changes that I want permanent, I would put the flash disk back into the USB slot (possibly not the same one as I used initially to boot, as I would like to keep many versions of the boot flash disk), and run some command that would save the current state into a compressed image on the disk. How can I set this up?

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  • How to apply disk quota in ubuntu server on a VPS?

    - by Pedram
    I have a VPS with ubuntu server 10.04 installed on it.Now I want to have some shell users with limited home folder size. It seems quota is the best way to do this, but all tutorials require editing /etc/fstab and add usrquota or grpquota to /home partition options. As my /etc/fstab looks like this: proc /proc proc defaults 0 0 none /dev/pts devpts rw 0 0 how can I apply quota?

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  • How migrate my keyring (containing ssh passprases, nautilus remote filesystem, pgp passwords) and network manager connections?

    - by con-f-use
    I changed the disk on my laptop and installed Ubuntu on the new disk. Old disk had 12.04 upgraded to 12.10 on it. Now I want to copy my old keyring with WiFi passwords, ftp passwords for nautilus and ssh key passphrases. I have the whole data from the old disk available (is now a USB disk and I did not delete the old data yet or do anything with it - I could still put it in the laptop and boot from it like nothing happened). On the new disc that is now in my laptop, I have installed 12.10 with the same password, user-id and username as on the old disk. Then I copied a few important config files from the old disk (e.g. ~/.firefox/, ~/.mozilla, ~/.skype and so on, which all worked fine... except for the key ring: The old methods of just copying ~/.gconf/... and ~/.gnome2/keyrings won't work. Did I miss something? 1. Edit: I figure one needs to copy files not located in the users home directory as well. I copied the whole old /home/confus (which is my home directory) to the fresh install to no effect. That whole copy is now reverted to the fresh install's home directory, so my /home/confus is as it was the after fresh install. 2. Edit: The folder /etc/NetworkManager/system-connections seems to be the place for WiFi passwords. Could be that /usr/share/keyrings is important as well for ssh keys - that's the only sensible thing that a search came up with: find /usr/ -name "*keyring* 3. Edit: Still no ssh and ftp passwords from the keyring. What I did: Convert old hard drive to usb drive Put new drive in the laptop and installed fresh version of 12.10 there (same uid, username and passwort) Booted from old hdd via USB and copied its /etc/NetwrokManager/system-connections, ~/.gconf/ and ~/.gnome2/keyrings, ~/.ssh over to the new disk. Confirmed that all keys on the old install work Booted from new disk Result: No passphrase for ssh keys, no ftp passwords in keyring. At least the WiFi passwords are migrated. 4. Edit: Boutny! Ending soon... 5. Edit: Keyring's now in ./local/share/keyrings/. Also interesting .gnupg

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  • Manic Monday - More OpenWorld Solaris Sessions: Developers, Cloud, Customer Insights, Hardware Optimization

    - by Larry Wake
    We're overflowing with Monday sessions; literally more than one person can take in. Learn more about what's new in Oracle Solaris Studio, hear about the latest x86 and SPARC hardware optimizations, get some insights on cloud deployment strategies, and find out from your peers what they're doing with Oracle Solaris. If you're an OpenWorld attendee, go to to Schedule Builder to guarantee your space in any session or lab. See yesterday's blog post and the "Focus on Oracle Solaris" guide for even more sessions. Monday, October 1st: 10:45 AM - Maximizing Your SPARC T4 Oracle Solaris Application Performance(CON6382,  Marriott Marquis - Golden Gate C3) Hear how customers and commercial software partners have reached peak performance on SPARC T4 servers and engineered systems with Oracle Solaris Studio and its latest tools for analyzing, reporting, and improving runtime performance: Autoparallelizing, high-performance compilers Performance Analyzer (used to find performance hotspots) Thread Analyzer (to expose data races and deadlocks) Code Analyzer (used to discover latent memory corruption issues) 10:45 Cloud Formation: Implementing IaaS in Practice with Oracle Solaris(CON8787, Moscone South 302) Decisions, decisions--at the same time, we've got a session that covers why Oracle Solaris is the ideal OS for public or private clouds, IaaS or PaaS, with built-in features for elastic infrastructure, unrivaled security, superfast installation and deployment, nonstop availability, and crystal-clear observability. This session will include a customer study on how Oracle Solaris is used in the cloud today to implement the Oracle stack. 12:15 PM - Customer Insight: Oracle Solaris on Oracle Exadata, Oracle Exalogic, and SPARC SuperCluster(CON8760, Moscone South 270) Hear from customers what benefits they have realized from using the Oracle stack on Oracle Exadata and Oracle’s SPARC SuperCluster and from using Oracle Solaris on those engineered systems, taking advantage of built-in lightweight OS virtualization (Zones), enterprise reliability and scale, and other key features. 1:45 PM - Case Study: Mobile Tornado Uses Oracle Technology for Better RAS and TCO?(CON4281, Moscone West 2005) Mobile Tornado develops and markets instant communication platforms, replacing traditional radio networks with cellular networks. Its critical concern is uptime. Find out how they've used Oracle Solaris, Netra SPARC T4, and Oracle Solaris Cluster, including Oracle Solaris ZFS and Zones, for their Oracle Database deployments to improve reliability and drive down cost. 3:15 PM - Technical Panel: Developing High Performance Applications on Oracle Solaris(CON7196, Marriott Marquis - Golden Gate C2) Engineers from the Oracle Solaris, Oracle Database, and Oracle Tuxedo development teams, and Oracle ISV Engineering discuss how they develop high-performance enterprise applications that take advantage of Oracle's SPARC and x86 servers, with Oracle Solaris Studio and new Oracle Solaris 11 features. Topics will include developer tools, parallel frameworks, best practices, and methodologies, as well as insights and case studies on parallelizing and optimizing application performance on Oracle Solaris. Bring your best questions! 3:15 PM -  x86 Power Management with Oracle Solaris: Current State, Opportunities, and Future(CON6271, Moscone West 2012) Another option for this time slot: learn about how Intel Xeon and Oracle Solaris work together to reduce server power consumption. This presentation addresses some of the recent power management improvements in Oracle Solaris, opportunities to further improve energy efficiency, and some future directions for Oracle Solaris power management.

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  • Mount: "The disk drive for UUID=<uuid for /> is not ready yet or not present."

    - by searchfgold6789
    I recently did the update from 12.04 to 12.10 on my old Dell Latitude CPx laptop (Pentium III). When I rebooted I got this error message with no response from keyboard input. Below it is says Wait to continue, press S to skip mounting, or M for manual recovery. I also see occasional errors pop up on the screen from mountall and Plymouth. I can still get into Recovery Mode. Can anyone shed some light on the matter?

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  • Disk Is Cheap! ORLY?

    People often conclude that the cheap price of storage is a license to use as much as possible, but there is a cost. Solomon Rutzky talks about the issues you may face if you are not careful with your storage decisions. Join SQL Backup’s 35,000+ customers to compress and strengthen your backups "SQL Backup will be a REAL boost to any DBA lucky enough to use it." Jonathan Allen. Download a free trial now.

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  • WebCenter Content Web Search Performance: Do you really need that folder path info?

    - by Nicolas Montoya
    End-users want content at their fingertips at the speed of thought if possible. When running search operations in the WebCenter Conter Web Interface every second or fraction of a second improvement does matter. When doing some trace analysis on the systemdatabase tracing on a customer environment, we came across some SQL queries that were unnecessarily being triggered! These were related to determining the folder path for every entry part of the search result set. However, this folder path was not even being used as part of the displayed information in the user interface.Why was the folder path information being collected when it was not even displayed in the UI? We found that the configuration parameter 'FolderPathInSearchResults' was set to 'true' under Administration > Admin Server > General Configuration > Additional Configuration Variables as shown below:When executing a quicksearch by keyword we were getting 100 out of 2280 entries in the first page of the result set.When thera 'FolderPathInSearchResults' configuration parameter is set to 'true', the following queries appear in the systemdatabase tracing:100 executions for a query on the FolderFiles table for each of the documents displayed in the first page:>systemdatabase/6       12.13 11:17:48.188      IdcServer-199   1.45 ms. SELECT * FROM FolderFiles WHERE dDocName='SLC02VGVUSORAC140641' AND fLinkRank=0[Executed. Returned row(s): true]382 executions for a query of the folders tables - most of the documents that match the keyword criteria are at a folder depth level of three or four:>systemdatabase/6       12.13 11:17:48.114      IdcServer-199   2.57 ms. SELECT FolderFolders.*,FolderMetaDefaults.* FROM FolderFolders,FolderMetaDefaults WHERE FolderFolders.fFolderGUID=FolderMetaDefaults.fFolderGUID(+) AND((FolderFolders.fFolderGUID = '1EB8E527E19B09ED3FE82EE310AEA13A' ) )[Executed.Returned row(s): true]By setting this 'FolderPathInSearchResults' configuration parameter to 'false', the above queries were no longer reported in the Server Output System Audit Information.Now, let's consider a practical scenario:Search result set page = 100Average folder depth der document in the search result set: 5The number of folder path related queries will be: 100 + 5*500 = 600If each query takes slightly over 3 ms. You would have 2000 ms (2 seconds) spent in server time to get this information.The overall performance impact goes beyond seerver time execution, as this information needs to travel from the server to the browser. If the documents are further nested into the folder hierarchy, additional hundreds of queries may be executed. If folder path is not being displayed in the end-user interface profile, your system may be better of with the 'FolderPathInSearchResults' configuration parameter disabled.

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  • At what point is asynchronous reading of disk I/O more efficient than synchronous?

    - by blesh
    Assuming there is some bit of code that reads files for multiple consumers, and the files are of any arbitrary size: At what size does it become more efficient to read the file asynchronously? Or to put it another way, how small must a file be for it to be faster just to read it synchronously? I've noticed (and perhaps I'm incorrect) that when reading very small files, it takes longer to read them asynchronously than synchronously (in particular with .NET). I'm assuming this has to do with set up time for things like I/O Completion Ports, threads, etc. Is there any rule of thumb to help out here? Or is it dependent on the system and the environment?

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  • Is there a command to "manually automount" an attached disk?

    - by cheshirekow
    I have an extra hard drive which I use for backups. The label on its one and only partition is "backup". When I open nautilus and click on "backup" it mounds the drive in "/media/backup", and then there's a little eject button next to it's icon in nautilus. If I manually mount the drive by creating a directory and using "sudo mount /dev/sdx /some/dir", the eject icon still shows up in nautilus, but when I press it I get an error because the device was not mounted via whatever it is that mounts it the other way. What I would like is to be able to do this "mount to /media/backup and enable the eject button" via the command line. The goal is to have the device mounted by a script which needs the drive, but then leave it mounted until I manually eject it... if I want to. P.S. I'm aware that I can have the drive auto mounted at startup, but that's not what I'm looking for here, and I'd like to know if this is possible. Clarification: I'm looking for a command to "mount the drive the way nautilus would". This should create the directory "/media/backup", mount the device to that directory, and then when I press the eject button from nautilus, it should unmount the device and delete the directory.

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  • How can I copy data from a windows disk to another partition?

    - by TardisGuy
    I have a new Solid State Drive, and it's very fast (but tiny, 128GB). But it seems to be much faster in Linux. Now, am I correct in assuming that if I Gparted copy paste the {_Boot MSreserved__][_________NTFS__________] in to (1st Empty space, same partition) and it will be bootable, right? Will this work? I also heard I should turn off 'journaling' for the SSD filesystem. Is that needed for this as well?

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  • Melhoria de Performance no .NET 4.5: Multicore Just-in-Time (JIT).

    - by anobre
    Olá pessoal! Dando uma lida nas melhorias de performance da plataforma .NET 4.5, me deparei com algo extremamente interessante: Multicore Just-in-Time (JIT). A teoria é muito simples: por que não utilizar vários núcleos para a compilação JIT? Além disto, será que seria possível compilar os métodos em uma determinada ordem, onde os primeiros fossem aqueles com maior probabilidade de execução? Isto parece meio loucura mas é o que o Multicore Just-in-Time (JIT) faz. E o melhor de tudo, de uma forma extremamente simples. As aplicações ASP.NET 4.5 já o fazem por default. Em outras ocasiões, basta executar duas linhas de código: uma indicando a pasta onde o arquivo que armazenará o profile ficará, e a outra para iniciar o procedimento. Este profile é o arquivo responsável por armazenar a ordem de compilação dos métodos, para que aqueles com maior chance de serem executados mais cedo sejam compilados antes. Código para este processo: ProfileOptimization.SetProfileRoot(@"C:\ProfileRoot"); ProfileOptimization.StartProfile("profile"); .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } Esta otimização na compilação só será notada após a criação do profile. Portanto, na primeira vez nada será percebido. Ao final do processo, um arquivo com o nome escolhido (no caso profile) será criado, na pasta indicada como root: Fica a dica! Abraços!

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  • How to grant standard users access to disk partitions and flash storage?

    - by JK04
    I have a partition that I need standard users (not administrators)to have read/write access to. However, this partition does not even appear to them as it does to me as an administrator. How can I make it so that standard users can read/write to this partition? It would be nice if they could have the ability to mount it if needed. I have the same problem with removable media - if I have a flash card in the computer, the standard users cannot see this storage media.

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  • My computer boots up with Ubuntu: How can I tell what's on my hard disk?

    - by Larry Harson
    I've acquired an old laptop (Acer TravelMate 4050 with an Italian keyboard) that boots up with the following options: Ubuntu, with Linux 3.0.0-12-generic Ubuntu, with Linux 3.0.0-12-generic (recovery mode) Memory test (memtest86+) Memory test (memtest86+, serial console 115200) When I choose the first option, the screen just goes blank with a flashing cursor. But I can go into grub command mode by typing 'c'. Now, I want to know what operating system is installed, and the files stored on my computer, so how do I do this? What can I do to maximise the use of this computer in its current state?

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