Ubuntu Servers :: Custom RAID Setup ?
Jul 12, 2010
I'm setting up a web server but I have no experience with RAID. I would like to try this configuration if possible:
2 x HDD 500GB RAID1
1 x HDD 20GB (logs and tmp)
The old 20GB drive I would like to use it to store logs and temporally files (mounted in /var/log and /tmp respectively). With this I'm trying to reduce some disk usage in the RAID drives. In my idea, it would be better to write the access/error logs of the web server in a separated drive to the one serving the files which may increase speed... sounds crazy?
One problem is that during the installation, If I set the RAID automatically it will try to use my 20GB HDD as well in the RAID... Does it will work if I set the RAID first (removing the 20GB HDD) and then set the mount points in it after the installation?
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Oct 6, 2010
Can I use UUIDs to setup a raid with mdadm?
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Apr 4, 2011
I have the current disk setup :
disk1 :
Code:
sda:
(primary) sda1 ntfs
(primary) sda2 ext3 (mounted as / )[code]....
Before i set up the raid, but with this exact partitioning, the system booted perfectly. When i installed mdadm and created the raid1 mirroring on sda6 and sdb1, the init got screwed up, and all i get is a shell on initramfs, from where i can inspect that sda is binded on md, and cat /proc/mdstat tells me that i have an inactive sda[4].I can't mount the root partition (sda2), because it's busy (i suspect dmraid to lock it), which is, i guess, why init cannot be found.
I wonder if my error is to setup a raid array using a logical partition contained in an extended partition (but i hardly see why it would not work - but the sda bind and the sda[4] in mdstat seems to tell me that it does not), or it's just the initrd that is improperly configured. The other things that bothers me, is that changing the partition type of the raid partitions (fd to 0 - Empty), to disable raid autodetection, resulted in the same behavior on boot. Which might lead me again to think about configuration file problem instead of improper setup.The live cd doesn't not seem to recognize raid, so i can't inspect problems any further, but i could inspect system configuration, but i don't really know where to start.
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Apr 15, 2010
I am rebuilding two microsystems servers and I need some advice to make my dreams come true.I want to setup the servers in a RAID configuration and want to install a GUI Linux application to manage a file server, manage a subnet, and host a Moodle on my subnet.I am planning to use Asus eee netbooks running Linux as my client computers. I basically need to be able to get my kids on the web and be able to have them use some open source office suite tools. No major crunching. I'll have two Macs for that.
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Oct 3, 2010
i installed ubuntu server on a 4-hard disk system, i installed with the RAID 10 support that comes with 10.04 server optioon. my raid swap is /dev/md0 and my raid data partition is /dev/md1
hard drives are /dev/sda /dev/sdb /dev/sdc /dev/sdd
the instalation goes fine, from the 8TB im getting 4TB mirrored which is what i want,
but the instalation setup goes up to the point where it asks me to install grub boot loader, There i choose the default option and it does a fatal error.
my main goal is just to make it bootable, any method is welcome. this went beyond my RAID knowledge (more conceptual than technical)
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Jan 22, 2009
I have had no problem installing Fedora OS on any of my Dell servers prior to this post. Anyway, I wouldn't call this a problem but recently, we bought another DELL server with Quad Core, 4GB, etc... AND this model has 2 swappable SAS Harddrives.
I wouldn't call myself an expert but then again I am not a newbie too. However, I have never setup any RAID before and now I am forced to setup RAID1 on this server. So, in a way, I am a newbie in setting up RAID
Would someone please point me in the right direction as I have no idea what I am supposed to do to setup the RAID. FYI, I will be installing Fedora 10 64bit on this server. I would appreciate if you can start from the very beginning, ie. partitioning, formatting the harddrives during OS installation, etc..
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Jun 7, 2010
I'm looking to set up a bit of a home server, and am wondering about storage. What I'd like is something like RAID 6, which has good redundancy built-in, but with this being a home server, I'd prefer to start a little smaller and leave room to build it up in future. I'd been looking at commercial products like the 'drobo', which seems fairly ideal, but I'd really like to see if I can do it myself. I understand that throwing the RAID into an LVM will allow for some expansion, but the last time I checked, most RAID setups called for the same sized disks, or at least limited the array by the size of the smallest disk present.
What I'd like is the ability to build a basic framework with a few cheap disks, and then as things start filling up, to be able to add larger ones (perhaps eventually pulling out smaller ones as though they'd failed and replacing them with big ones)
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Mar 12, 2010
I have a total of 4 hdd's, 500gb 7.2rpm that I would like mirrored using raid 10. As you can see from the image, ubuntu 9.10 server isn't recognizing the full 2tb's. In fact, I'm not even sure about the configuration as I was thinking the HDD's would come up as four 500gb hdds. Instead I have the configuration above set and ready for Ubuntu to be installed on.
1. Is this typical of a server pre-configured from Dell(perc6 raid controller.
2.Why is ubuntu not recognizing the full capacity of the drives especially when it's a server install?
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Feb 1, 2011
Could any RAID gurus kindly assist me on the following RAID-5 issue?I have an mdadm-created RAID5 array consisting of 4 discs. One of the discs was dropping out, so I decided to replace it. Somehow, this went terribly wrong and I succeeded in marking two of the drives as faulty, and the re-adding them as spare.
Now the array is (logically) no longer able to start:
mdadm: Not enough devices to start the array.Degraded and can't create RAID ,auto stop RAID [md1]
I was able to examine the disks though:
Code:
root@127.0.0.1:/etc# mdadm --examine /dev/sdb2
/dev/sdb2:
Magic : a92b4efc
Version : 00.90.00
code....
Code:
mdadm --create --assume-clean --level=5 --raid-devices=4 /dev/sda2 /dev/sdb2 /dev/sdc2 /dev/sdd2
As I don't want to ruin the maybe small chance I have left to rescue my data, I would like to hear the input of this wise community.
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Nov 3, 2010
This is a strange problem. I have Ubuntu server installed on a proper server hardware. My RAID card reports all four HDDs to ubuntu as single drives, which is how i set it up because Ubuntu does not recognize the raid card on the server. Now you might say if thats the case, why dont i remove the raid card and have the BIOS report to ubuntu as four single drives then i can perhaps setup software raid. Well my board has only one sata port.Ubuntu is all setup. on the first drive and i have set the other three up using software RAID.
System works great only problem is it freezes sometimes. Not everytime, just on the odd occassion I use the same Hardware without the raid card and of course just one HDD and it great. No freezes.That leads me to believe its the RAID card.My question is why will it run great for days and sometimes just freeze on me? Probably silly but if theres an issue with the RAID card, it should not work at all, should it?
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Jun 4, 2010
I've been all afternoon trying to install Ubuntu Lucid on my fakeRAID 0 configured (2) HDDs and am unable to set GRUB up. The fake RAID setup is provided by Intel Matrix Storage Manager, it is correctly enabled and the BIOS is also correctly set up -- in fact, I've managed to install Windows 7 with no significant hitch. After struggling with partioning the drives (had to follow advice I found on a very helpful guide online [0]), creating the filesystems AND getting Ubuntu's installer to actually do what it is supposed to do, I now cannot seem to set GRUB up. My system, as it stands, is unbootable at all; via live CD only.
This is how the RAID0 dev is partitioned:
Code:
# fdisk -l /dev/mapper/isw_ecdeiihbfi_Volume0
Disk /dev/mapper/isw_ecdeiihbfi_Volume0: 1000.2 GB, 1000210694144 bytes
255 heads, 63 sectors/track, 121602 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 131072 bytes / 262144 bytes
Disk identifier: 0x6634b2b5 .....
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Dec 15, 2010
So I didn't notice when I setup my CentOS 5.5 server that I left / as RAID 0 on md1. All the rest are RAID 1. Is there a way I can modify the array to RAID 1 without a risk of data loss? I'm glad I caught this before I setup any other services. I've only setup smb so far...
[root@ftpserver ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/md1 16G 3.0G 13G 20% /
[code]....
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Sep 1, 2009
Background: Took a while to get this working correctly, so figured I'd save you all some time... I (finally) received the beta invite from iPredator. I wasn't happy with the NetworkManager-pptp implementation, I'm running the stock kernel, I stopped the NetworkManager service at this point.
Goals:
1. To be able to control the PPTP tunnel from a remote location over ssh
2. To have services I run from my box accessible via my public IP on the internet (sshd, httpd etc) whilst the tunnel is up
3. To route all Torrent traffic from Vuze out of the encrypted PPTP tunnel, and have it return over that interface
4. To route all other traffic, by default, to my ISP unencrypted
5. To block all Vuze traffic if the tunnel is down
Method:1. PPP config
First, I entered my login details (altered in the below output, of course!!) into chap-secrets and then used "chmod 600 chap-secrets" to make it read/write for root only:
Next, I created a peer file (644 permissions) for the VPN connection, the file name has to match the "iPred" I used above:
I stuck with the defaults in /etc/ppp/options.pptp
To initiate the tunnel, I use: pppd call iPred mtu 1435 mru 1435 persist nolog
Regarding the options used... I'll get onto the MTU/MRU later, persist has the tunnel attempt to reconnect 10 times if it drops, nolog reduces the high volume of syslog messages. The logs for the connection process are written to /var/log/messages, interface ppp0 was created and routing entries were set up (internal network stuff has been cut out below; we'll call 192.168.100.104 my WAN IP, though I've got a static internet-routable IP and wanted to mask it here). The (dynamic) endpoint of the tunnel is 93.182.164.2: you need two routes to this, one via eth0 (my WAN interface) for internet routing of the encrypted packets, and one through the tunnel itself to tunnel and encrypt the traffic:
References:[url] [url]
2. Firewall Setup
I'm a "belt-and-braces" kinda guy ("belt-and-suspenders" if you're from the US), and I've got a custom firewall setup. As I've brought a new interface into the equation, I needed to add some rules.
In order, the rules:
A. NAT the outgoing packets to the ppp0 interface IP
B. Allow established sessions back in
C. Allow the default ports for Vuze through, even if unsolicited, on port 63255 (TCP and UDP)
D. Drop traffic that originates from Vuze (identified by the IP of interface lo:0, which we'll see later) if it tries to exit via eth0 (useful if the tunnel drops or hasn't yet been started)
You can view the rules in place by issuing: iptables -nL
References:man iptables [url]
3. Routing Setup
Obviously, I didn't know who the Vuze peers are going to be and setting a default route via ppp0 means that all traffic would be encrypted. Instead, I created a new, distinct, routing table called IPRED in iproute.
Then I added a default route, via ppp0, into the IPRED routing table and checked that it was there:
The main (default) routing table is still there and has it's routes:
4. Traffic Identification
I tried setting the DSCP (ToS) in Vuze, but that didn't make it into the packets (checking the output packets with Wireshark). So, I created a new Loopback interface lo:0 on my box (later I entered this line into /etc/rc.local so it'll survive a reboot):
I then added a rule to pass traffic from this new lo:0 IP to the IPRED table:
There are a number of other ways to pick out traffic with "ip rule", but this seemed the most elegant solution in this situation.
5. Vuze Config
I looked down the list for the local IP addresses, then bound Vuze to the lo:0 interface which, in Vuze, is lo[1]
Whilst in here, I also dropped the Line MTU to 1435. You'll notice that this matches the MTU and MRU set when using pppd to establish the tunnel... I'm on DSL and have the MTU set to 1478 for the DSL link, the difference between the 1478 and 1435 is the overhead of the additional headers used with PPTP tunnelling (both PPP and GRE headers encapsulate the packets). With the MTUs set up in this way, I shouldn't get any fragmentation of packets on the link, packets with the DontFragment bit set shouldn't get dropped. I gave Vuze a restart.
6. Verifying Operation
I closed any apps that were using the internet, fired up Vuze, loaded a torrent, then opened two Wireshark windows.... Started Wireshark#1 on the eth0 WAN interface and Wireshark#2 on the ppp0 tunnel interface. I saw a long list of PPP and GRE packets (in white) scrolling on the eth0 window, showing that Vuze is going through the tunnel. Checking the ppp0 Wireshark window, I saw the actual Vuze traffic on the ppp0, with SYN's, ACK's, http packets etc as it's being sent down/back through the tunnel.
Starting firefox and visiting www.whatismyip.com, the IP reported was my eth0 address, I saw the http traffic on Wireshark on eth0. Starting e-mail, I saw the packets on eth0.
Dropping the tunnel, I checked Vuze, saw that torrents had stopped and confirmed that I couldn't connect to the net with it.
7. DNATing
Reconnecting everything, I sat and watched the Wireshark outputs on ppp0 and eth0 for a while to make sure everything was working. I noticed that the ppp0 interface was creating a lot of ARP requests for external IP's and sending them out, unencrypted, through eth0 - BAD news!! I'd forgotten that I would need to Destination NAT the unsolicited inbound connections... D'Oh!
As the unsolicited inbound connections are directed at the internet-routable tunnel IP of ppp0, we need to point these to the lo:0 interface that Vuze is listening on. Replies to these will be NAT'd back to the ppp0 address by the MASQUERADE rule we've already entered in iptables and, since the source IP will 172.27.72.64, the packets will match the ip rule pointing them to the IPRED routing table, thus they won't generate ARP requests.
Retrying everything with the firewall updated, everything is working 100% :-D
8. Misc
As the iptables rules have been saved, and lo:0 will survive a reboot in /etc/rc.local, the only commands that need to be run each time you want to bring up the tunnel are (easily scripted with a sleep statement of about 10 seconds after pppd call...):
And, if you wanted to just send all traffic over ppp0, this would be:
Conclusion: I love Linux, an intellectual challenge, having complete control over my PC; iPredator rocks and I hope this howto is of use to anyone running Fedora and iPredator :-D
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Mar 14, 2010
I ended up setting up a basic linux file server as a pdc for that office. Our main office is a windows 2000 ads domain. The two offices are connected with a vpn. I only have two users at the new location so I simply have the linux and samba usernames/passwords setup manually. I would like to know if it is possible to setup a domain trust between the two sites so I don't have to create a username/password in the remote site for every user at the main office to access. I did some searching but came up empty.
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Feb 5, 2011
I've recently setup a custom home server running openSUSE 11.3 64-bit in terminal mode. I've since successfully setup and configured it to act as an iSCSI target using the iscsitarget package and the corresponding kernel module, along with the YaST module for the configuration. Prior to setting up my hard drive accordingly, however, I noticed that when I ran 'zypper up' in a terminal I got the following:
Code:
pph-server:~ # zypper up
Loading repository data...
Reading installed packages...
[Code]....
At the time I accepted, and found later that it removed the setup I had, meaning I had to start over. However when I ran YaST in a terminal it then wanted to re-install the iscsitarget package, which subsequently removed the tgt package, and so this continued for a bit. (Thankfully no actual data was stored on the target at this stage .) For the time being I've locked the iscsitarget package and the kernel module to prevent zypper from wanting to remove it and install tgt instead since I now have my target working as I want.
The question I have is why zypper was trying to remove iscsitarget and install tgt, and yet the corresponding YaST module was wanting to do the opposite. Is tgt considered a better option by the openSUSE developers, in some way, for setting up an iSCSI target? Is iscsitarget development/availability being ceased by them in favour of tgt? Is there something else I'm missing? Neither of these packages seems old to me: the latest version of iscsitarget was released on SourceForge last July, while tgt was only updated this month.
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Apr 25, 2010
I have set up a RAID1 array and am trying to test if its is set up correctly/if errors are detected, reported and recoverable.
Started up the mdadm monitor with:
Code:
I set the RAID array to a faulty state by doing:
Code:
However I do not get any problem reports to my e-mail address. When I test the mdadm I get this result:
Code:
When I look in the postfix folder, sure enough.. there is no main.cf file there... but there IS a file named 'master.cf'. I am running Ubunto 9.10 with default components - have postfix but no sendmail.
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Aug 2, 2011
I have a situation where I need to setup some sort of storage solution with Raid 5 redundancy. I was thinking that Linux would be the way to go but I am not certain what platform would be best.
I was thinking running two SATA RAID controllers to get me somewhere between 4 - 6 TBs in Raid 5. I am very comfortable with ubuntu now and would love to use it. I have also used FreeNas in the past but would love to have a full OS on the machine if at all possible.
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Feb 10, 2011
I got a motherboard asus m2a-vm that has support for raid 0, 1 and 10 and I was just curios if anybody has used a fakeraid for raid 0 with ubuntu. If so did it work out as planed?
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May 16, 2011
I've just finished setting up a RAID 1 on my system. Everything seems to be okay, but I have a very slow boot time. It takes about three minutes between the time I select Ubuntu from GRUB and the time I get to the login screen.
I found this really neat program called bootchart which graphically displays your boot process.
This is my first boot (after installing bootchart). I'm not an expert at reading these, but it appears there are two things holding up the boot, cdrom_id and md_0_resync. I tried unplugging my CD drive SATA cable, and this is the new boot image.
It's faster, but it still takes about a minute, which seems pretty slow on this system. The md0 RAID device is my main filesystem. Is it true that it needs to get resynced on each boot?
I'm not sure how to diagnose my CD drive issue. The model is a NEC ND-3550A DVD RW drive. I should also note that there's a quick error message at startup about the CD rom. It's too quick for me to read it, just one line on a black screen saying "error: cdrom something something".
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Aug 19, 2010
I have the latest ubuntu V10 and trying to set up a raid 5 to use as storage. I have 3 1 TB drives along with the 160 GB OS drive. Is what I want to do possible and is there a gui interface to perform this or clear instructions on how to accomplish this? I am a novice when it comes to Linux but trying to ween myself off of Microsoft.
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Dec 2, 2009
I have 2 drives and wish to use the following partition setup.
sda1 /boot 1GB ext4
sda2 / 50GB ext4 raid 0
sdb1 / 50GB ext4 raid 0
Unfortunately only Ubuntu server has the option to make a raid in the install. Can somebody point me to a howto on something like this up. I'm thinking I will want to install onto a sdb2 set up the raid and copy the file system to the raid.
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Jan 9, 2011
I'm trying to setup a RAID 5 array of 3x2TB drives and noticed that, besides having a faulty drive listed, I keep getting what looks like two separate arrays defined. I've setup the array using the following :
sudo mdadm --create /dev/md01 --verbose --chunk=64 --level=5 --raid-devices=3 /dev/sdb /dev/sdc /dev/sde
So I've defined it as md01, or so I think. However, looking in the Disk Utility the array is listed as md1 (degraded) instead. Sure enough I get :cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md1 : active raid5 sde[3](F) sdc[1] sdb[0]
3907028992 blocks level 5, 64k chunk, algorithm 2 [3/2] [UU_]
So I tried getting info from mdadm on both md01 and md1 :user@al9000:~$ sudo mdadm --detail /dev/md1
/dev/md1:
Version : 00.90
Creation Time : Sun Jan 9 10:51:21 2011
Raid Level : raid5 ......
Is this normal? I've tried using mdadm to --stop then --remove both arrays and then start from scratch but I end up in the same place. I'm just getting my feet wet with this so perhaps I'm missing some fundamentals here. I think the drive fault is a separate issue, strange since the Disk Utility says the drive is healthy and I'm running the self test now. Perhaps a bad cable is my next check...
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Sep 1, 2011
I want to customize the installation and I'm following the instructions here.I added my packages but now the iso is much larger(about 770 MB)Now I know I can simply delete from cd-image/dists/ but then the installer fails on missing deps.How can I do this safely ?
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Mar 11, 2011
I am just getting into the Raid world with my home server. what i have:
Asus M3A78-CM (may be wrong, cant remember for sure) Motherboard with 6 Sata2 Connectors
3 2TB Sata2 Drives
2GB of DDR2 Ram set in bank A
AMD Dual Core (i'll know what it is when i get the system booted)
What i am trying to figure out is when i build this system, I will put in the HDD's into Sata Ports 1-3 and in the BIOS i will setup a RAID 5 Array. Now, do i just format and partition like normal? Would it be better to have a smaller, and better performing Sata2 for the system so i can have the raid be only for file storage?
In what i have read about this, i need to format each drive into two partitions at least but i do not know what needs to be done, The guides just vaguely say something about two partitions and then move on (trick of the trade? keep all of us in the dark? LOL) I would like to have a raid for my storage and a faster disk for the OS and home directories. But if it cannot be done then thats how it is. So do i put the TB drives in Sata Ports 4-6 and my other drive in Sata Port 1?
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Jul 21, 2009
I looking to setup a CentOS server with RAID 5 i was wondering what the best way to set it up and How with the ability to add more HDD to the RAID system later on if needed?
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Dec 9, 2009
I'm setting up a backup server using Centos 5.3 and an Adaptec 5805 raid card and discovered that I can't use a raid setup that is over 2TB in size as the boot drive. What I eventually did was set up 2 raids on the same set of 4 drives so that I have a 200Gb 'drive' for booting and a 2.6TB 'Drive' for data. I want to keep the OS in the raid setting so I have some protection instead of having a dedicated stand alone drive for the OS. This will be for a company wide backup server and I want to minimize the possibility of drive failure for the OS as well as the Data.
I was able to install and reboot the system and everything seemed to be working but after some working on it a bit I did a reboot and wound up with a non-booting system. I can boot to the rescue mode with the install dvd and mount the original system and I even tried to reinstall the grub setup per instructions I found on the net but still I get a system that hangs up after it asks if I want to boot from the CD. If I take out the CDROM option from the boot lineup in the bios I stop at the same place minus the boot cd prompt.
I'm guessing it is something to do with one of the raid drives being over 2TB but I'm booting from a 200gb sized raid so I'm really at a loss for what to do next??
Is what I've described the correct way to handle booting up with a large raid or is there another way to reconfigure the drives as one big 2.8TB raid and use something other than grub to boot to it?
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Feb 14, 2010
I setup a HTPC about a month ago, and just expanded my storage by adding two 750GB drives in addition to my OS drive. I am using Ubuntu 9.10 as my OS and need help setting up a raid 1 on the two 750GB drives.
gparted shows the two drives as /dev/sdb and /dev/sdc
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May 27, 2011
My system includes two 120GB disks in fake raid-0 setup. Windows vista is installed on these.For Debian I bought a new 1 TB disk. My mission was to test Debian and I installed it to the new disk. The idea was to remove the disk afterwards and use windows as it was before. Everything went fine. Debian worked perfectly but when I removed the 1 TB disk from system grub will show up in boot in grub recovery mode.
Is my RAID setup now corrupted? Grub seems to be installed on the other raid disk? Did grub overwrite some raid metadata? Is there any way to recover the raid setup?
dmraid -ay:
/dev/sdc: "pdc" and "nvidia" formats discovered (using nvidia)!
ERROR: nvidia: wrong # of devices in RAID set "nvidia_ccbdchaf" [1/2] on /dev/sdc
ERROR: pdc: wrong # of devices in RAID set "pdc_caahedefdd" [1/2] on /dev/sda
ERROR: removing inconsistent RAID set "pdc_caahedefdd"
RAID set "nvidia_ccbdchaf" already active
ERROR: adding /dev/mapper/nvidia_ccbdchaf to RAID set
RAID set "nvidia_ccbdchaf1" already active
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Dec 7, 2010
I have a Dell workstation, 2 HDD, HDD 1 setuped Red Hat 5.3 with LVM, and that HDD 2 is empty, not install RAID 1. And, I want to setup RAID 1 (hardware RAID)...but, have a problem. I don't want to lost data on HDD 1 when I setup raid, I try ghost or backup it, but when I restore, it error because LVM is setup on that.
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Jan 11, 2011
I was wondering what is the proper way to setup a hardware based mirrored raid. I have two 2TB drives and a nvidia based raid on the motherboard. I used the nvidia raid manager to setup a Mirrored array consisting of those two drives. The total shows as 1.81TB array.
I boot into OpenSuSe 11.3 and in the partitioner I see two drives (dev/sda and dev/sdb each 1.82TB) listed instead of a single RAID drive. Am I doing something incorrectly that two drives show up instead of the array? Does something need to be enabled?
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