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• How to convert ext3 partition to use encrypted file system without loosing data?

  - by User1

  My embedded Linux device have 2 partitions: small root partition containing OS. big data partition which uses ext3 I want to encrypt the data partition by using encrypted file system. I don't want loose any data of the partition. Size of the root partition is too small to hold all data of the data partition. It is not possible to use any external data storage. Is there any tools that can convert filesystem of the data partition from ext3 to encrypted fs without copying all files to other place?

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• Tips on self-learning boot-time fundamentals (grub, disks, partitions, LVMs, etc)?

  - by Harry

  Is there any good resource which I can use to self-learn all the low-level system administration details on Grub, Grub2, disks, partitioning, LVM, etc? I'm comfortable with system admin tasks post-boot but I lack knowledge about both the fundamentals and actuals of all that happens during boot on a Linux system such as Fedora. Any recommendations on how to setup a testbed on my desktop for learning the above? I may not be able to get another machine / harddisk, so may have to rely on something like VirtualBox. But don't know if there are other (better) options... so asking for tips from those who have self-learned / mastered this track themselves.

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• IBM Thinkpad 240 - Best way to boot from floppy to USB - Best Linux for 300 MHz 128 MB RAM 800x600 s

  - by zillion

  Mostly I still have that old 'ultraportable' laptop that is mostly like a pre-netbook era laptop and a friend and programmer needs a computer because the one he was using just broke and he has to wait until the new one arrive in 4-6 weeks ... This laptop has no LAN connection and CD-ROM so be prepared for a real challenge! All hardware is well supported on Windows XP (included drivers on the Windows XP CD) and on Linux out-of-the-box (but the screen need a special configuration.) Mostly any Linux that will work well with Skype (USB or regular headset), any MSN client and a text writer for code will do. What I have tested so far: Slitaz 2 don't boot because the floppy of GRUB4DOS don't see the USB drive (fully working and tested on my regular laptop), Damn Small Linux was working but was needing a special screen configuration that I don't remember (in the boot options of the floppy) and now I'm thinking about Puppy Linux that is seen to work totally out of the box with it but I will need an old Puppy version (1 or 2 I think) and the Wakepup floppy ... If you got some ideas to help or to try I'm open!

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• USB key to pass password in Centos 6

  - by Andrew

  I had a room mate that put a livecd in my desktop and looked around on my machine. I caught him in the act and threw him out. I haven't had a room mate for a while now and so as to avoid the livecd issue again I encrypted the hard drive, the machine is running centos 6.3. Is there anyway that I can avoid typing the password in each time if I have usb key in the machine to feed the password to the system? Additional question. Is there anything you can suggest to solve the problem I have ? Thanks

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• where is my free space

  - by doug

  Hi there I'm using Pinnacle Studio 12 to edit some videos and as you can guess it use a lot of resources. The problem is that it eats all my free space from the C drive and after i close the application i don;t get back my free space. I assume it does some swap files but where and why it doesn't delete them? I don't store the project and saved files on C drive. I'm running Pinnacle Studio 12 on a XP sp3 Windows machine. I've tried to clean my system with CClean, but it doesn't find/see where my space is lost! TY

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• SUBST for OSX? Error when trying to map local folder as network drive on Mac OSX 10.9

  - by Taylor Wright

  I would like to map a local folder as a drive (similar to Window's SUBST). One solution I found was to map a shared folder, but I get the following error when using a local folder: There was a problem connecting to the server “MyDrive.local”. This file server is available on your computer. Access the volumes and files locally. I was using this guide: Mapping Drives (Shared Folders) on Mac OS X

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• Why does storage's performance change at various queue depths?

  - by Mxx

  I'm in the market for a storage upgrade for our servers. I'm looking at benchmarks of various PCIe SSD devices and in comparisons I see that IOPS change at various queue depths. How can that be and why is that happening? The way I understand things is: I have a device with maximum (theoretical) of 100k IOPS. If my workload consistently produces 100,001 IOPS, I'll have a queue depth of 1, am I correct? However, from what I see in benchmarks some devices run slower at lower queue depths, then speedup at depth of 4-64 and then slow down again at even larger depths. Isn't queue depths a property of OS(or perhaps storage controller), so why would that affect IOPS?

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• Drobo not mounting. Disk repair doesn't work either.

  - by kohei

  Hi, While transferring data to my 2nd gen Drobo power went out. Now my Drobo is not mounting to my OS X 10.6.3 I have tried Disk Repair and this error message appears: Verify and Repair volume “disk1s2” Checking Journaled HFS Plus volume. Invalid key length Invalid record count Catalog file entry not found for extent The volume could not be verified completely. Volume repair complete.Updating boot support partitions for the volume as required.Error: Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files. I tried DiskWarrior too but it doesn't work either. It gives me that I need more memory to continue and software shuts down. Any one know solution to this one?

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• Detecting a TPM chip?

  - by Danielb

  I have a HP Mini 311-1000CA netbook running Windows 7 Ultimate. I'd really like to encrypt the harddrive using BitLocker but I am unsure as to how to work out if the Mini has a TPM chip or not. Any ideas?

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• ubuntu server slowly filling up

  - by Crash893

  We had our samba server (ubuntu 8.04 ltr) share fill up the other day but when I went to look at it I cant see any of the shares have to much on them we have 5 group shares and then each users has an individual share one users has 22gigs of stuff a few others have 10-20mb of stuff and everyone else is empty so maybe like 26gigs total I deleted a few files yesterday and freed up about 250mb of space today when i checked it it was completely full again and i deleted some older files and freed up about 170mb of stuff but i can watch it slowly creep down in free space. I keep running a df -h Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda1 241690180 229340500 169200 100% / varrun 257632 260 257372 1% /var/run varlock 257632 0 257632 0% /var/lock udev 257632 72 257560 1% /dev devshm 257632 52 257580 1% /dev/shm lrm 257632 40000 217632 16% /lib/modules/2.6.24-28-generic /volatile what can I do to try to hunt down whats taking up so much of my hdd? (im fairly new to unix in general so i apologize if this is not well explained)

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• 16GB winsxs folder on windows vista

  - by Jigs

  I know there are lots of posts about the winsxs folder, but I have yet to find any useful information about shrinking it. I have already tried running the two service pack removal tools. The folder totals a massive 16GB (about 10% of the entire drive!) If anyone has any pearls of wisdom then please share them.

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• write-through RAM disk, or massive caching of file system?

  - by Will

  I have a program that is very heavily hitting the file system, reading and writing randomly to a set of working files. The files total several gigabytes in size, but I can spare the RAM to keep them all mostly in memory. The machines this program runs on are typically Ubuntu Linux boxes. Is there a way to configure the file system to have a very very large cache, and even to cache writes so they hit the disk later? I understand the issues with power loss or such, and am prepared to accept that. Crashing aside, in normal operation the writes should eventually reach the disk! Or is there a way to create a RAM disk that writes-through to real disk?

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• Compiling the Linux kernel, how much size is needed?

  - by ant2009

  I have downloaded the newest most stable Linux kernel, 2.6.33.2. I thought I would test this using VirtualBox. So I create a dynamically sized harddisk of 4 GB. And installed CentOS 5.3 with just the minimum packages. I setup the make menuconfig with just the default settings. After that I ran make and got the following error: net/bluetooth/hci_sysfs.o: final close failed: No space left on device make[2]: *** [net/bluetooth/hci_sysfs.o] Error 1 make[1]: *** [net/bluetooth] Error 2 make: *** [net] Error 2 The amount of space I have left is: # df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 3.3G 3.3G 0 100% / /dev/hda1 99M 12M 82M 13% /boot tmpfs 125M 0 125M 0% /dev/shm My virtual size is 4 GB, but the actual size is 3.5 GB. $ ls -hl total 7.5G -rw-------. 1 root root 3.5G 2010-04-13 14:08 LFS.vdi How much size should I give when compiling and installing a Linux kernel? Are there any guidelines to follow when doing this? This is my first time, so just experimenting with this.

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• SQL Server: One 12-drive RAID-10 array or 2 arrays of 8-drives and 4-drives

  - by ben

  Setting up a box for SQL Server 2008, which would give the best performance (heavy OLTP)? The more drives in a RAID-10 array the better performance, but will losing 4 drives to dedicate them to the transaction logs give us more performance. 12-drives in RAID-10 plus one hot spare. OR 8-drives in RAID-10 for database and 4-drives RAID-10 for transaction logs plus 2 hot spares (one for each array). We have 14-drive slots to work with and it's an older PowerVault that doesn't support global hot spares.

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• Ghost Image - windows asks for activation on when deployed to VM

  - by Chris Sobolewski

  I have several images created with Ghost Solution Suite (v11 I believe), the images have been in use for a few years now, but I am finally to the point where I have enough time to attempt to virtualize them for easier updates. I am running VMWare and attempting to image the virtual machines with my ghost image files. For my images I am running sysprep with minisetup and using reseal. The image deploys successfully, however when I start the VM for the first time, it demands windows activation. This doesn't happen when I image a physical computer, even a different model with different hardware. The idea of virtualizing my images becomes rather worthless if I am unable to deploy the images without having to activate every time (especially as Microsoft keeps declaring our volume licence key as invalid for activations). Does anyone know why it is asking for activation on a virtual machine, but not a physical PC? How can I prevent this?

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• How to improve Primary hard disk rate on Windows 7 Experience Index?

  - by Abdullah BaMusa

  I’m getting confused with window 7 experience index; because on one of my home computers with 2 hard disks 7200 rpm configured with RAID 0 I got 5.9 as score on “ Disk data transfer rate “, while on another computer which had only one hard disk 7200 rpm got also 5.9 as score on “ disk data transfer rate “. Shouldn’t RAID 0 configuration means high read right IO?

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• ESX 4.0 space: DASD, NAS, or ?

  - by thormj

  I put together an ESX box for better management, but its performance is a WTF item; I'm a noob at dealing with ESX, so I'm looking for a laundry-list of reading material to help me straighten this out so I can go back to .NET programming. Current storage system: We're running Raid5+Hotspare (8x500 GB spindles) on a PERC6i on a Dell 2910. Due to ESX limitatios, the PERC is showing the storage as 1x2TB + 1x800GB "partitions." I'm not sure of the setup's configuration (stride / stripe / ???) at all. Our Applications We have a SBS server as well as a minor (2x50 GB, but growing at 10GB/month) database server... Our application that lives on the database VM is CPU and I/O insense; it's a database churning excercise mixed in with a lot of computation on the data (fixing that performance is what I'm supposed to be working on)... Perfomance Issue When I do a backup, restore, or worse (copy a backup from 1 vm to another to move it to the QA VM), the entire system slows to a crawl (even "unrelated" VMs). I originally thought a DASD situation would be quite good since you had PCI-x bandwidth, but the systemwide slowdown is killing productivity. Questions What should I do to make an intelligent decision about NAS vs RAID vs SAN vs DASD? Are there sweet spots/ugly spots in the storage setup? Can you use a SSD PCI-X card in ESX for the tempdb? Good/Bad idea? Is there any way to "share" some image in a copy-on-write fashion? Most of the "Backup-Copy-Restore" is to "put a clean image on the dev boxes"; if I could have them "share" the master image, the "big copy" (2x50 GB) would only need to be done once per week instead of once per dev per week...[runtime performance isn't a concern with the dev boxes, but the backup/copy/restore kills production, SBS, and everything else on the box]

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• Identifying Hard Drive as performance bottleneck for desktop machines

  - by Programming Hero

  I'm working in a development team where we all use laptops so we can work in multiple locations. These laptops are proving notoriously slow for development work, but at a glance they all look to have the specification for a much faster experience: CPU - Intel Core 2 Duo T7500 Memory - 2GB of RAM We all experience the biggest delays when the hard-drives are being accessed, particularly when swap-files are being thrashed. After doing a little bit of profile, a colleague discovered that our HDDs are seeing Read/Write speeds of about 10MB/sec. This seems abnormally low and we believe it the cause of the problem. Sensibly (though somewhat annoyingly) our business wont blow money on faster drives just to see if it fixes the problem; we need to illustrate this is definitely the problem and that buying some solid-state drives will make it go away. I need some way of showing how 90% of the system resources aren't being used over the course of a day, and that whenever there is utilization, it's all in HDD reads or writes. Are there any tools I could use to provide this information? Does it seem likely the problem is going to be fixed by a faster drive? Should I be looking for alternatives?

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• RAID10 without write-back cache = horrible write performance?

  - by Harry Mexican

  I have just provisioned a dedicated server on singlehop. I'm running it through some tests to know what to expect performance-wise. On the I/O side (with 4 1TB disks in RAID 10) I get: write-cache disabled 200 MB/s read throughput 30 MB/s write throughput I thought that was really low compared to my desktop HD which gets 150-150 or so. So I had a chat with them and they suggested enabling the write cache. New results: write-cache enabled 280 MB/s read 260 MB/s write which is great and all but means I'd have to add a BBU for an additional monthly cost. Is it normal for the write throughput to be 1/4 of a regular drive on RAID10, if you don't have write cache? It almost feels like its intentionally bad to force you to pony up for the BBU. I'd be happy with normal non-raid performance of 150/150.

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• CentOS 5.4: HDD drive support with sector size of 4096 bytes

  - by FractalizeR

  I'm going to replace damaged HDDs in my server with new drives, which have sector size of 4096 bytes instead of 512. Does CentOS natively support such drives? If yes, since which version? If no, what actions should I take to correctly prepare such a drive to work. How to check that such a drive is correctly recognized by OS?

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• Missing HDD space - says 65GB used, selecting all folders shows 30GB used

  - by Igor K

  Hi Running Windows Server 2008, 74GB raptor drive and noticed we only had about 500MB left - yikes! So deleted some old backups we don't need, but can't track down where about 30GB seems to be taken up. If I go to C: and select all folders and go to properties, this comes to around 30GB but in My Computer I can see 65GB is used. How can I find out whats eating the space? Just IIS + MSSQL Express + Smartermail on the server

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• Simple Workstation Imaging Solution?

  - by Will

  Hey guys, I need a fairly cheap imaging solution for Windows XP corporate desktops. Ideally, I'd be able to set up a desktop exactly as we want it, create an image, deploy this image to a server, then boot a new desktop to a CD/USB Drive/Network and quickly set up the workstation. Ideally, each computer would also have a unique workstation name. Any ideas? Right now I'm using a custom built Linux DD solution, but it's slow, not network-based, can't image multiple computers at the same time as there's only one copy on a USB drive, and can't uniquely name the computers. Thanks, Will

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• Simultaneous read/write to RAID array slows server to a crawl

  - by Jeff Leyser

  Fairly beefy NFS/SMB server (32GB RAM, 2 Xeon quad cores) with LSI MegaRAID 8888ELP controlling 12 drives configured into 3 different arrays. 5 2TB drives are grouped into a RAID 6 array. As expected, write performance to the array is slow. However, sustained, simultaneous read/write to the array (wether through NFS or done locally) seems to practically block any other access to anything else on the controller. For example, if I do: cp /home/joe/BigFile /home/joe/BigFileCopy where BigFile is 20G, then even a simple ls /home/jane will take many 10s of seconds to complete. In addition, an ls /backup will also take many tens of seconds, even though /backup is a different array on the same controller. As soon as the cp is done, everything is back to normal. cp /home/joe/BigFile /backup/BigFile does not exhibit this behavior. It's only when doing read/write to the same array.

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• Can't access USB drive anymore

  - by marie

  I have a 32 GB Lacie Cookey USB flash disk that doesn't show in the Computer window but it's visible as a device. cmd > diskpart DISKPART> list disk Disk ### Status Size -------- ------------- ------ Disk 0 Online 149 G Disk 1 No Media 0 DISKPART> select disk 1 Disk 1 is now the selected disk. DISKPART> clean Virtual Disk Service error: There is no media in the device. It also appears in the Disk Management tool, but the box is empty. Is there anything I can do or is it dead? ............................................................ output from ChipGenius: Description: [F:]USB Mass Storage Device(LaCie CooKey) Device Type: Mass Storage Device Protocal Version: USB 2.00 Current Speed: High Speed Max Current: 200mA USB Device ID: VID = 059F PID = 103B Serial Number: 070535924B170C18 Device Vendor: LaCie Device Name: CooKey Device Revision: 0100 Manufacturer: LaCie Product Model: CooKey Product Revision: PMAP Controller Vendor: Phison Controller Part-Number: PS2251-67(PS2267) - F/W 06.08.53 [2012-09-26] Flash ID code: 983AA892 - Toshiba [TLC] Tools on web: http://dl.mydigit.net/special/up/phison.html

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• How to re-do the hard disks in a WD Word Book Edition II ?

  - by jfmessier

  I recently purchased a WD World Book II, a 2 TB one. I call it the "White Box". It has those 2 1TB drives, and they were in this RAID 1 config, only giving me about 1 TB. I could not delete the raid array, and I took the drives in a Linux box. But I also deleted the entire partitions of the disks, and I cannot even et the existing RAID array on this WD White Box. The drives are fine, but I cannot get them to work on the WD White Box. My goal was to get back to a real 2 TB storage space. If I cannot get those drives back in the White Box, I can re-use them elsewhere, but this would mean a waste of the firmware and network connection. After the fact, I read that, anyway, the network performance is rather poor. Thanks :-)

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