Red Hat :: Loading RHEL 6 On Machine With Two RAID Arrays
Apr 15, 2011
Have a customer who is due for a new system. AS they just renewed their RHEL entitlement, they plan on ordering a Dell server without a OS preload. Two questions:
- Will RH let them download RHEL6 just by maintaining the entitlement when their current version is RHEL 3?
- The server will have two RAID arrays - one intended for /home, one for "everything else". As I've never done a clean load with two arrays, how do I select what file systems go on which array?
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Jun 10, 2011
With mdadm was only able to add a new drive to the using the --force function. I do not feel comfortable with using the function that way though. When I remove a disk in VMWare, it perfectly says that the drive is lost and the array is degraded (mdadm --detail /dev/md0). Although after re-adding the drive, it immediately shows device as busy for both mdadm and sfdisk when I don't use --force.
Recovery and repairation of degraded array worked fine with sfdisk --force, mdadm --add --force, it automatically started recovering and took not so long. What are best practises to manage software raid-1 arrays?
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Jan 3, 2010
I am in a situation where I am stuck with a LVM cleanup process. Although I know a lot about AIX LVM , but this is first time I am working with Linux LVM2. Problem is that I created two RAID arrays on storage, which appeared as mpath0 & mpath1 devices (multipath) on RHEL. I created logical volumes and volume groups and every thing was fine till I decided to clean the storage arrays and ran following script:
#!/bin/sh
cat /scripts/numbers | while read numbers
do
lvremove -f /dev/vg$numbers/lv_vg$numbers
vgremove -f vg$numbers
pvremove -f /dev/mapper/mpath$numbersp1
done
Please note that numbers was a file in same directory, having numbers 1 and 2 in separate line. Scripts worked well and i was able to delete definitions properly (however I now think I missed one parted command to remove the partition definition from mpath device. When I created three new arrays, I got devices from mpath2 to mpath5 on linux and then I created vg0 to vg2. By mistake, I ran above script again for cleanup purpose and now I got following error message
Cant remove physical volume /dev/mapper/mpath2p1 of volume group vg0 without ff[/B]
Now after doing mind search, I now realize that I have messed up (particularly because mpath devices did not map in sequence to vg devices and mapping was like mpath2 --- to ---- vg0 and onwards). Now how I can cleanup the lvm definitions? should i go for pvremove -ff flag or investigate further? I am not concerned about data, I just want to cleanup these pv/vg/lv/mpath definations so that lvm can be cleaned up properly and I can start over with new raid arrays from storage?
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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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Mar 30, 2010
I have created software raid 5 configurations on the second harddrive its working fine and i have edited fstab file for auto mounting when it reboot but when i reboot the computer raid doesn't work i have to re-create the arrays by typing "mdadm --create" command again and mount again manually ,is there anywhere i can do this once without retyping the commands again after rebooting and i am also using redhat 5
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Jun 21, 2011
what do I have:2x 150GB drives (sda) on a raid card (raid 1)for the OS (slack 13.37)2x 2TB drives (sdb) on that same raid card (raid 1, too)2x 1.5TB drives (sdc,sdd) directly attached to MoBo2x 750GB drives (sde,sdf) attached to MoBo too.if i got about it the normal way, i'd create softRAID 1 out of the the 1.5TB and the 750GB drives and LVM all the data arrays (2TB+1.5TB+750GB) to get a unified disk.If I use btrfs will I be able to do the same? mean I have read how to create raid arrays with mkfs.btrfs and that some lvm capability is incorporated in the filesystem. but will it understand what I want it to do, if i just say
Code:
mkfs.btrfs /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1
probably not, eh?
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Jun 5, 2010
I have never preformed a rebuild of an RAID array. I am collecting resources, which details how to build an RAID 5 array when one drive has failed. Does the BIOS on the RAID controller card start to rebuild the data on the new drive once it is installed?
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Mar 30, 2010
i want to remove the raid 1 arrays on our server centos and use standalone drive
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Jun 10, 2011
With mdadm was only able to add a new drive to the using the --force function. I do not feel comfortable with using the function that way though.
When I remove a disk in VMWare, it perfectly says that the drive is lost and the array is degraded (mdadm --detail /dev/md0). Although after re-adding the drive, it immediately shows device as busy for both mdadm and sfdisk when I don't use --force.
Recovery and repairation of degraded array worked fine with sfdisk --force, mdadm --add --force, it automatically started recovering and took not so long.
What are best practises to manage software raid-1 arrays?
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May 13, 2010
I have two SAS RAID controller cards in a Dell server in slots 2 & 3, both with an array hanging off them. I went to install a third card into slot 1, but then when it boots it says two of my sd's have bad magic number in the super-block and it wants me to create an alternative one, which I don't want to do. If i remove the new card, the server boots perfectly like it did before I added the new card. Is the new card trying to control stuff that isn't hooked up to it because its in slot 1, so its confusing RHEL?
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Jul 6, 2010
So I have a system that is about 6 years old running Redhat 7.2 that is supporting a very old app that cannot be replaced at the moment. The jbod has 7 Raid1 arrays in it, 6 of which are for database storage and another for the OS storage. We've recently run into some bad slowdowns and drive failures causing nearly a week in downtime. Apparently none of the people involved, including the so-called hardware experts could really shed any light on the matter. Out of curiosity I ran iostat one day for a while and saw numbers similar to below:
[Code]...
Some of these kinda weird me out, especially the disk utilization and the corresponding low data transfer. I'm not a disk IO expert so if there are any gurus out there willing to help explain what it is I'm seeing here. As a side note, the system is back up and running it just runs sluggish and neither the database folks nor the hardware guys can make heads or tails of it. Ive sent them the same graphs from iostat but so far no response.
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Sep 14, 2010
I just started testing a redhat enterprise linux 5 installation. This installation took place in a Latitude D630 labtop which currently has Ubuntu Desktop in (sda1) and Ubuntu Server in (sda3). My goal was to install Redhat Enterprise Linux 5 into (sda4). Both of the Ubuntu installation boot fine and work, but when I try booting the RHEL it shows a panic in the loading phase as follow VFS: Cannot open root device "sda4" or unknown-block(0,0)Please append a correct "root=" boot optionKernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)I am wondering what this means, maybe some of you would have a better clue than I do
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Apr 22, 2010
how to create RAID-1 in rhel-5
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Feb 25, 2010
I'm having a problem installing RHEL-5 on my system. I have Windows 7 installed so far on a Dell XPS workstation that came with hardware RAID 0. I have 2 x 500 gb hard drives. So I went in Win 7 and partitioned my disk to leave about 75 gb of unallocated space to install RHEL-5 on. I load the RHEL-5 DVD into my disk, restart my comp, and just follow installation steps. Use about 73 GB as an ext3 partition for the RHEL-5 and have about 2 GB reserved for swap space. RHEL-5 installs, and I'm all done. However, when I reboot the computer, the GRUB boot loader fails to load. I'm directly taken into Windows. How do I recover GRUB so I have the option of loading into RHEL-5?
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Mar 15, 2011
Recently I came across this error while booting up our RHEL 5 server:
Starting send mail:/ user/ sbin/sendmail:error while loading shared libraries libdb-4.3.so cannot open shared object. error-27
sm-client:/ user/ sbin/sendmail:error while loading shared libraries libdb-4.3.so cannot open shared object. error-27
Also, while creating a new squid user, I get the same error: htpasswd /etc/squid/squid_passwd alok
htpasswd: error while loading shared libraries: libdb-4.3.so: cannot open shared object file: Error 27
The libdb-4.3.so file exists in my /usr/lib. When I looked up for error code 27, it says " File too large ". I thought maybe its because of the number of users. But even after removing some duplicate user accounts, I still can't figure out why the error remains.
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May 10, 2009
I want to Install RHEL 4.7 64 bit on one my server (Supermicro Super Server) having RAID controller1. Intel2. AdaptecWe are using Adaptec.We are using RAID 1 with 2x320GB Hard disksPOINT: If we Install RHEL 5.3 it recognize RAID controller and show single Logical volume of 298 GB, Means working fine but when we try to install RHEL 4.7 it shows two hard disks of 298GB and 298GB,meanz its unable to recognize RAID controller.So, the issue is Driver of it, CD which we got from super micro having driver for RHEL 4 to RHEL 4 update 6We are making our DR site and its necessary for us to Install RHEL4.7 to make it identical.I searched a lot and spent more than three days on it continuously, And still unable to find the solution.
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Dec 14, 2010
I wanna configure RAID 1 within TWO HDD in RHEL-5 during installation moment .I have the following questions regarding software raid vs hardware raid :
1) What is the basic difference between hardware and software raid
2) In software raid , If I use two HDD as RAID1 , then if one HDD is failed , can I boot it from another HDD ?
3)In software RAID , Between two HDD , If One HDD is failed then if I remove bad HDD and add a spare HDD then is it automatically synchronized with FIRST HDD ?
4) In software raid is it possible to keep '/boot' partition in two HDD (I use 2 HDD as RAID1) as separate partition ?
5) Finally is there any documnets or sites where I get software raid configuration during INSTALLATION moment in using GRAPHICAL mode , plz give me the address.
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Nov 28, 2009
I recently setup a software RAID1 with two hard drives for testing. I manually unplugged one hard drive to test redundancy and it was fine. I then did the same to the second and plugged back in the first and it was fine. But when I plugged both back in it is only loading one of the mirrors instead of both. I am guessing when the mirror (failed), at least as far as the system knew it removed it from the load sequence to prevent data corruption... how do I go about re-enabling it?.
cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb1[1]
[code]....
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Jan 13, 2009
I have a fancy new Quad Core Xeon machine here that I'm trying to install F10 x64 on. The installation went fine. When it reboots the first time, though, I get the dreaded Error Loading OS.
So I dug up my bookmark of the awesome Grub HOWTO here and followed the steps to install Grub manually. Alas, I get the same result after installing it. Even tried doing a makeactive (hd0) just in case, but no luck.
I did more searching and searched for "raid install" but didn't find anything helpful. So here I am... hoping somebody has some insight.
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Jul 27, 2009
Currently I am attempting to install Centos 5.2 64bit onto a Supermicro X7DCL-3 motherboard based machine. The Raid recognizes the HDD that's been installed into it, however, the drivers for the raid are not included in the install. After contacting Supermicro I've been supplied with a driver package that should fix the problem.[URL]However, I am still having trouble using the package in order to find the HDD (The only HDD in the machine) that is on the raid.I think I'm doing something that's should be fairly simple, but am screwing it up pretty bad.
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Jan 18, 2011
I am trying to install RHEL 6 on a machine without a monitor. After reading through their installation guide I have decided to try a vnc installation using my laptop. The guide says: To activate the VNC connect mode, pass the vncconnect boot parameter:
boot: linux vncconnect=HOST
The problem is that I have never had to do this before, I have no idea what "pass a boot parameter" means.
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Oct 5, 2010
Is VirtualBox on RHEL a good Idea? I am running rhel 5.5 on and amd 64 machine. The internet reviews rated VirtualBox pretty high. What is the real scoop?
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Jan 11, 2010
How can I install Xen server on RHEL 5.3 machine?
The server is: AMD 64bit (supports virtualization)
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Feb 1, 2010
I am preparing for the RHCE and would like to get some feedback on network installation.
1. How can we practice network installation on the Vista? I have installed CentOS installed using VMware desktop on Vista windows?
2. In exam do we get network server installed or we have to install it?
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Jun 16, 2010
I am not very new to LINUX. I was using UBUNTU for the last 1 year and I have switched to Redhat now because I am thinking of taking a RHCE certification now. Actually the problem is that I am unable to install RHEL 5.2 i386 on my i686 machine, I have bought it recently 1 week ago. I tried to use the boot parameter "linux noprobe" then it said drivers not found after 2 steps when it loads drivers.
When I tried to make a GUI install it hanged after "loading /sbin/loader" and said "kernel panic - not syncing". And when I tried to make a text install it said hanged agin after "loading /sbin/loader" and said something like "Oops: 0000 [#1] SMP". If drivers are needed then when can I get those and how can I install those drivers? here is my hardware information as "lspci" says:
00:00.0 Host bridge: Intel Corporation 82G33/G31/P35/P31 Express DRAM Controller (rev 10)
00:02.0 VGA compatible controller: Intel Corporation 82G33/G31 Express Integrated Graphics Controller (rev 10)
00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 01)
00:1c.0 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 1 (rev 01)
00:1c.1 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 2 (rev 01)
00:1c.2 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 3 (rev 01)
00:1c.3 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 4 (rev 01)
00:1d.0 USB Controller: Intel Corporation N10/ICH7 Family USB UHCI Controller #1 (rev 01)
00:1d.1 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #2 (rev 01)
00:1d.2 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #3 (rev 01)
00:1d.3 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #4 (rev 01)
00:1d.7 USB Controller: Intel Corporation N10/ICH 7 Family USB2 EHCI Controller (rev 01)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1)
00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01)
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 01)
00:1f.2 IDE interface: Intel Corporation N10/ICH7 Family SATA IDE Controller (rev 01)
00:1f.3 SMBus: Intel Corporation N10/ICH 7 Family SMBus Controller (rev 01)
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 02)
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Jan 4, 2011
How do i create two partition on my hdd and install rhel on one and windows xp on the other
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Feb 2, 2010
view all the software installed on my RHEL 5 machine. Can we find any utility like Add/Remove Programs in Windows?
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Dec 14, 2009
I can create a virtual machine I named vm1 and the virtual-machine manager says it's running.
I don't know how to load windows XP.
The vm1 virtual machine console is frozen with the message "Booting from hard drive." But I know it can't boot from hard drive because I haven't loaded windows XP yet. When I created the vm1 virtual machine I put the windows XP CD in the optical drive and directed the menu to the CD. I heard it running, but still the console is trying to boot from the hard drive. I never got to the point where it asked me any windows XP software loading questions.
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Dec 7, 2010
I have tripwire enterprise (not open source) agent running on one of my rhel4.8 web servers (I have actually tried with two servers with same results). The agent is a simple install rpm bin file and appears to be running as it should and the server for tripwire enterprise is set up accordingly. A windows tripwire enterprise agent is also on a windows machine that works perfectly well. But I cannot seem to get the tripwire server to talk to the agent on the red hat machine.
I can connect to port 9898 on the server, but the agent who also talks over the same port doesn't appear to be responding to the server on this port. There are no iptables set up to block the requests, there is no firewall set up (disabled) . Network team can see the packet requests being sent over the routers fine... So can't see why there would be a problem. So i reverted to the use of net cat.
Nc -l 9898 (on the agent machine)
Telnet <agent> 9898
But I get connection refused. Is there anything I could be missing here? Redhat is not my Linux of preference and it may be something obvious!
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Feb 4, 2010
How to resolve a standalone RHEL machine under Windows Domain Controller?
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