CentOS 5 :: Is The Separation Of OS Drive And Data Drive Recommended
Jan 13, 2010
- 160gb is where i install CentOS (pretty much the hard drive for operation system) - Lets call this drive A
- Two 1TB drives run in RAID 1, using software RAID (this is where i will store personal data, pictures, movies, music, etc...) - Lets call this RAID 1 setup drive B
I am planning to run a virtual Win Server 2008 using Xen and have that be my domain controller. I will use samba to share drive B and have the network drive map when user login to the domain.
- If for some reasons i have to reinstall CentOS, this pretty much mean drive A will be formatted and reinstalled. Knowing my self i probably will goof up some config in CentOS and will need to reinstall the OS to fix it. Since drive B will be the centralize location for my home network, i dont want to lose the data. Will i be able to re-setup the RAID setup of drive B and still have all the data stored on it intact after a reinstall?
- Is the separation of OS drive and data drive recommended?
- Are there any better way to accomplish my setup? I am pretty much just looking to make a linux file server and windows on client's end.
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Mar 12, 2009
I am hosting some VPS, and I am wondering the best way to copy the VPS data to a secondary hard drive mounted on /backup on a daily basis.
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Nov 26, 2009
I have a new system using an Intel DG451D main board. I have been trying to get a RAID 1 mirror set working as the main drive in this system and for some reason, my SATA drives - three of them all new have had their SMART data changed to show the drives as failing and in need of replacement. Eventually the drive reports failure to the degree that the BIOS no longer recognises it. When loading the Centos os I was getting differing results because of this issue. I am not sure if this is a hardware issue even - I know that the drives were all very much OK and brand new - no good now! Just putting a feeler out to see if anyone has had a similar issue or to see if anyone knows of any possible known causes for this?
Failing any explanation, can anyone suggest a good desktop style Main Board that supports RAID well for Centos 5.4? I plan to sue this as a small server system so graphics etc are not important here.
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Mar 31, 2009
I exchanged my CDROM drive for DVD drive. The DVD is recognized in the BIOS (will boot to DVD install disc) and in CentOS 5.2 (when I list the hardware), but CentOS must still think it's a CDROM drive. When I run VLC in a terminal it kicks back these errors code...
I think this means that "hdc" is linked to a CDROM configuration somewhere, but I don't know where to find it to change it (or out it). It also appears thee is no DVD module loading. (Of course, I could be making poor guesses.)
I thought there might be something in the fstab, but it doesn't appear there is anything there (for the CDROM or DVD drive)?
Is there somewhere else I should be looking? /dev/*** ?
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Mar 21, 2009
Sometimes when I do anything write heavy such as transferring backup or downloading large files from the net, the machine crashes almost completely.
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Aug 13, 2010
I currently have a 1.5TB sata drive connected to my system, with data already on it. In the next few days I am planning to use mdadm to create a raid5 array with another 2 1.5TB drives along with the one I already have. Is it possible to create the raid without losing the data on my current hard drive? Obviously it will be backed up before hand just in case, but it would be nice not to have to restore nearly a TB of data after raid'ing the drives.
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Jun 12, 2009
I have a server which had one drive in it that was using LVM. I removed it and moved it to the secondary bay in the same server, then installed a fresh new blank drive in the primary bay on this server.
I then installed CentOS 5.2 on the new drive. During the partition phase of the install, I partitioned my new drive and MAY or MAY not have removed the LVM from the second drive and left the partition there, not sure exactly what I did.
After install I wanted to try to mount the old drive so I could access the files on the old drive. The /boot partition shows up when I do a df -h but not the / partition where everything I need is stored.
When I look at the drives in Webmin, the second drive is there and shows up as LVM but has not LVM name.
Basically what I need is on /dev/sdb2.
How I might be able to mount this partition which seems to still exist when looking at webmin.
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Aug 8, 2009
I have an XD card with lots of pictures in it which suddenly stopped working, it gives me "card error" messages in my camera (and any other one) and it refuses to mount on my laptop's card reader (which does work in F11 for XD cards, I've tried other ones).So I'm trying to use some program to make an image of what's in the card, like ddrescue or dd_rhelp. But they all need me to mount the disk, which I just can't. I have tried to mount it manually, but I'm not even sure what device I should point to.
So my question is, how can I mount a faulty drive in such a way that any of these programs can make an image? Or maybe there is a smarter way to try to get my pictures back? (There are some non-free programs in Windows which may seemingly help, but I'd like to figure out how to do this in Linux).
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Dec 3, 2009
The following quote is the sad, sad story of a thumb drive with the partition table nuked, as told by a friend of mine:
Quote:
Data was recovered from an XP system by booting with a BartPC CD and copying onto a USB thumb drive. Nothing unusual.
System was rebooted into the XP install CD.
The first drive that was found was the 16gb thumb drive (AKA flash drive) and the person (re) installing XP didn't catch the fact that XP presented the 16gb thumb drive instead of the 160gb hard drive.
The drive partition function in XP deleted the partition table - on the thumb drive.
A freeware utility in Windows shows the data but can't recover the file names, so that everything is gobbledygook. Does anybody know of a utility or program under Linux that can help? I have a laptop running F 12 and can do the work if needed, but don't know what program to use.
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Jun 9, 2010
My OS hard drive crashed on my file server. and now I am trying to "restore" my drives.
I am having problems re-creating without erasing data my Linux LVM drive. I would like some instructions on how to re-create my logicalVolumeGroups and phisical groups so I can re-mount my Linux LVM partition.
Here is my specific information.
when I do a pvdisplay I only get my boot vg_files group listed
pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name vg_files
PV Size 74.33 GB / not usable 577.00 KB
Allocatable yes (but full)
[Code]...
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Aug 19, 2010
I have a laptop with Fedora 12 on it and I accidentally did an dd if=/dev/zero of=/dev/sda (since then I learned to think before I type)
anyway, I stopped it in time (I hope), it only zeroed first 60 MB. So, it killed partition table and boot partition. What I need is home partition, and it should be untouched. home is on a LVM device (fedora default install settings), and I tried testdisk (supposedly handles LVM) but it found only one partition (I guess it's a LVM physical device, as there should be 3 partitions, /, /home and swap) and said it's not recoverable.
Is there a way to get access to files on that partition (partition itself, including file table should be untouched). Partition contains various data (video, audio, and text) I need back (and it's my data, not backed up, and not something I can redownload). Is there any software that can help me with this, and if not, is it theoretically doable (I believe it should be, as the partition itself is not damaged, so it should be possible to read file names and link them with data on disk, am I right)? what is a good way to image the disk, so I can reinstall the laptop while trying to rescue data from image?
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Jan 8, 2011
I've accidently begun installing Ubuntu Studio onto my OpenSUSE drive I stupidly forgot to to swap my hard drive cables around.
Luckily, the Ubuntu Studio install failed before I noticed the problem, but I need to access the SUSE drive to pull some date off of it. Whats the best way of doing this?
I used a program in windows XP to try and pull the data (mainly holiday snaps) off the drive, but it only works on NTFS file systems, so didn't get me what I need.
How can I access the data on the linux partitions? I'm fairly certain I was using 11.2, which after a bit of googling seems touse the EXT3 file format. Correct?
I'm in over my head here really, as you can probably tell, but what my limited knowledge leads me to believe is that the Ubuntu installer overwrote my partition table (is that right?) but left all the data there still.
Ideally I need a program very similar to the one that I used, but which works for the SUSE filesystem, and runs under XP (my only working OS at the moment)
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Dec 29, 2010
An external 3½" HDD seems to be in danger of failing” it's making ticking sounds when idle. I've acquired a replacement drive, and want to know the best strategy to get the data off of the dubious drive with the best chance of saving as much as possible. There are some directories that are more important than others. However, I'm guessing that picking and choosing directories is going to reduce my chances of saving the whole thing. I would also have to mount it, dump a file listing, and then unmount it in order to be able to effectively prioritize directories. Adding in the fact that it's time-consuming to do this, I'm leaning away from this approach.
I've considered just using dd, but I'm not sure how it would handle read errors or other problems that might prevent only certain parts of the data from being rescued, or which could be overcome with some retries, but not so many that they endanger other parts of the drive from being saved. I guess ideally it would do a single pass to get as much as possible and then go back to retry anything that was missed due to errors.
Is it possible that copying more slowly — e.g. pausing every x MB/GB — would be better than just running the operation full tilt, for example to avoid any overheating issues? For the "where is your backup" crowd: this actually is my backup drive, but it also contains some non-critical and bulky stuff, like music, that aren't backups, i.e. aren't backed up. The drive has not exhibited any clear signs of failure other than this somewhat ominous sound. I did have to fsck a few errors recently — orphaned inodes, incorrect free blocks/inodes counts, inode bitmap differences, zero dtime on deleted inodes; about 20 errors in all.The filesystem of the partition is ext3.
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Apr 7, 2010
I am trying to create a RAID data drive for my system but I am having setting it up since I am a total linux noob.
The system has 3 physical HDD-s:
1. 320 GB (has functional Ubuntu 9.10 installation) attached to a PCI SATA card
2. 2TB on motherboard
3. 2TB on PCI SATA card
I want to create a software RAID1 of disks 2 and 3. So far I have used the Palimpsest Disk Utility:
- Created a GUID Partition table on both disks (2, 3)
- Used File -> New -> Software Array, made sure both my drives were included
- Once Palimpsest listed the RAID Drive as a Software RAID Array, I told it to create Ext3 filesystem on it
Well.. at least thats what I thought I did. At this point I have been able to mount the RAID drive and put files on it. However when I look at its information in Palimpsest, I am told that the drive is not partitioned. Both RAId components /dev/sda1 and /dev/sdc1 are reported to be in Sync, but the RAID Drive's own state is 'Running, Resyncing @ 45%' (and lowly growing).
My questions are: Is this a normal setup or did I do something incorrectly? Why is the drive reporting to have no partition? And howcome I can use it if it does not have a partition? I have found the command line based configurations to be a tad too confusing to follow, so I have tried to stick to graphical tools - is this a hopeless cause in Ubuntu or is it possible to achieve what I want to do without command line? I will list some info on my disks below - perhaps this offers more insight to those of you more familiar with Linux.
Code:
mindgamer@mind-server:~$ sudo lshw -C disk
[sudo] password for mindgamer:
*-disk:0
description: ATA Disk
product: WDC WD3200BEVT-0
vendor: Western Digital
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Apr 7, 2010
How can I do partition of my drive without losing the data?
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May 27, 2010
A friend of mine somehow managed to accidentally format her USB key the other day. It had all the photos of her daughter on it and she's more than a little upset about it.
I've told her not to fret too much just yet and that I'll have a look to see if there's any way to recover any of the data (specifically the photo's, she's not overly fussed about the rest)
I've had a look through the web, and foremost looks like it's the most promising option but I don't want to start messing around with it until I've asked my fellow ubuntu users for advice and thoughts.
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Jul 4, 2010
I have recently gotten hold of a device that helps me plug my old ATA/IDE hard drive to my computer and view my old files that I wish to recover. I am using Ubuntu and the harddrive that I wish to retrieve the data from also has an Ubuntu install on it. The files I wish to recover are old .doc files, which I want to keep to remember my old writings.
The problem I have encountered arises when I wish to open some of the files. The icon for some of the files, which happen to be my best writings, has an X on the top right, indicating that I cannot view the contents. When I click on the files, the following error message pops up: "Access to /media/c885571b-a6e5-4a2d-937a-78af7050910/george/Courses/hist388/Passion.doc was denied."
Now, I am guessing that I need to be able to log in as superuser or something to be able to access these files, so I logged in my terminal as super user by following the instructions outlined on this page: [url]
I still did not have the sufficient access required to be able to open the files that I would like to retrieve.
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Jul 10, 2010
Could I please have some recommendations for Data Recovery of a Formatted Drive. There are so many choices out there that I don't know which one I wanna use.
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Sep 27, 2010
I have the strangest issue where my HDD reports full, but I can only account for about a tenth of the data.
Specs:
Ubuntu 10.4
laptop Toshiba Tecra A11
HDD 250GB
4Gb RAM
/home 20.3GB
/usr 2.4GB
/var 742MB
/lib 132.9MB
/opt 71.3 MB
/boot 15.4MB
/etc 14.2MB
sbin 7.4MB
bin 6.4MB
The rest are below a MB. This system is not a dual boot so 241Gb is ext4 and 8.9Gb is Extended and 8.9GB is Swap. This system has been loaded for about a month, when I initially loaded it there was 230GB free.
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Jan 28, 2011
I have installed ubuntu 10.10 inside windows using wubi installer on drive "D".Now inside ubuntu I can excess contents of all other drives except drive "D". Why it is so? Is there an way to access the data on drive "D" within ubuntu?
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Mar 24, 2011
let me know is there any package available in ubuntu for recovering data from the usb drive
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Apr 13, 2011
I will admit i dont know how partitions work in ubuntu. I installed 10.10 on a fresh disk with just 40gb for the OS. I was planning on using the rest as a data drive.
[Code]...
If i go places > computer i do see a drive "250GB harddisk: 189gb filesystem"... I assume this is the free space mounted. However, inside that folder is "lost & found" with a x on it and i dont have permissions to write to the folder/space. I'm just looking for some advice on how i can use/access this free space. I have gparted live cd and i've tried several things but 2bh i don't know what i am doing.
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Jun 17, 2011
I have a 1Tb Western Digital Network drive. I was showing someone the photos on this on their XP computer and noticed that each file also had a capitalized version beside. I assumed this was a copying mistake and highlighted all the capitalized copies and deleted them. To my horror all files have vansihed. The next horror came in that XP apparently doesn't move deleted files to the recycle bin it just deletes them. I rapidly went back to my ubuntu machine and mounted the network drive. However none of my normal recovery file methods work on network drives. PhotoRec doesn't list the drive. and sudo ddrescue -r 3 ~/.gvfs/SFTP for [myname] on [address]/[path] ~/LOGFILE tells me permission is denied.
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Jul 28, 2011
So, I recently acquired a second hard drive (1.5 TB) and I wish to partition Ubuntu 11.04 with Windows 7. I've set everything up properly and using the Disk Utility in my System Settings I've created a 1 TB partition which I want to use for Linux. I think it has the proper partition type but how do I exactly go about transferring all my files from the hard drive I'm using now to the partition I would like to have?
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Oct 3, 2009
Im using rhl 5 on my new hard drive,i want to transfer data from my older hardrive (which has windows xp installed,one partition has fat32 and another has ntfs filesystem) to the new hardrive...
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Oct 17, 2010
I was using a Buffalo LinkStation Duo to store pictures and the OS in the unit failed. As far as I know, the data on the two 1 TB drives is fine, and since Buffalo uses a Linux kernel in their LinkStation and the format is xfs, it should be possible to get the data off if I can mount one of the drives on a Linux box. I've put one of the drives into an external USB enclosure and attached it to my Linux system, but I cannot get the drive to mount, probably because it is one element of a Raid 1 array.
Most of what I can find on the Web concerns setting up a new Raid array, not creating an array around a drive that already contains data. I have installed mdadm, and I'm running Mint Linux release 9 (Isadora) on an Intel box. When I run mdadm -D /dev/sdb or sdb6, the device and the partition where the data is located, it reports that the device does not appear to be an md device. I'm not sure what that means. Any help would be greatly appreciated, as I've got around 13,000 photos on these disks that have no backup (I figured what could go wrong with mirrored copies?).
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Sep 1, 2010
I am constantly replacing server drives at work. Our terminals use Transcend 2gb Compact Flash Drives. Sometimes we run into drives that need to be replaced due to IO errors. Which brings me to my questions.
I have heard that you cannot restore data from a drive that has IO errors. Is this true with Compact Flash Drives? It is to my understanding that IO errors are due to bad sectors on a harddrive and not the file it self. Is this true? Why can I not use the old drive to restore from?
My process is to mount the Old Server as dev/hdb and the new server as /dev/hda. Then restore the customers data. Every server card already has our software on it. We are just restoring sales info and that stores specific data.
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Jul 19, 2010
I have a Seagate 1TB external USB 2.0 hard disk which contains 740 GB of data. Everytime I connect, it shows the memory occupied and the remaining memory(190GB)..but when i try to access the folders inside they read empty... nothing is seen in the folders.. I am unable to read any data from it or write to it... Same is the case with Windows When I run self-test in Linux ubuntu I get
Reallocated sector count
threshold: 36
Normalized: 61
Worst: 61
value: 6488
Current pending sector count:
Normalized:1
threshold: 0
worst: 1
value:2036
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Oct 4, 2010
My friend just got a gaming laptop that he won't let anyone else use (his last one got infected when his girlfriend surfed on it for just one hour -- he refuses to use antivirus since he claims he knows how to keep clean, but he doesn't trust others).
Because I used Linux a bit once, I said to him what if I could promise not to make any changes to your hard drive, and I told him that I was pretty sure I could boot to a live cd and then only write files to a usb key. He's actually willing to let me try (I showed him some linux sites I was looking at, and he believes me that we can do this).
1) Is there anything I either MUST do or else must NOT do to make sure I make no changes to his laptop's hard drive? And so that any changes are only going to go on the usb drive I hook up?
2) Since he's got an i7 processor, I assume I should get a version of ubuntu that supports 64 bits, right?
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Feb 21, 2011
the software will go through the motions and say burn successful and all the disc itself will even have look like its been written (with the burn circle and all), but when its put into the drive afterwards its still empty. My fstab has
Code:
/dev/sr0 /mnt/cdrom0 auto users,rw 0 0
/dev/sr1 /mnt/cdrom1 auto users,rw 0 0
for my drives. Both of them do this, wondering if anyone has any idea why it might do this. I know the drives both work fine.
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