Server :: Final Destination - Raid Level 5

Jul 23, 2011

I currently store my backup files onto 2 HDDs that I have in external USB enclosures, one is 1.5TB and the other is 2TB. They both basically mirror each other, but is done by manually copying files onto one and then the other. My goal is to have a Raid level 5 system and I know that level of Raid is a minimum of 3 disks so I'm wondering what my current options are with Raid level 5 in mind.

I can immediately wipe out one of the two drives I currently have with the second requiring some time to offload data from if it is not possible to proceed with Raid unless I have this second disk free. So my situation is this. Is it possible to do something right now with two disks and then convert to Raid level 5 later once I have a third disk without starting from scratch?

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Ubuntu Servers :: Changing RAID Level On An Existing Server

Mar 9, 2011

We have been using Ubuntu Server at our department since several months now. It hosts a website, e-mail and nfs(only intra).

It was set-up as RAID 0 with two 1TB Hard drives but I want to change it to RAID 1 for fault tolerance. Is it possible to change existing RAID level? If yes can someone point me to the proper place?

I tried "mdadm" documentation and level set option is available but no explanation available that whether it is only while creating the array or it can change the level too.

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Red Hat / Fedora :: RAID Level For Servers?

Sep 1, 2010

How can we know which Raid level is useful for the server E.g Mail, Web, Database server. Also things we can keep in mind before configuring RAID / LVM on live servers.

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Fedora Servers :: Convert A Running System To RAID Level 1?

Sep 30, 2009

I was recently requested to try and convert a running system to RAID level 1. I did not succeed in this task. However, I am still interested in accomplishing this task in a test environment.What I did was create a RAID device with a device missing e.g.

mdadm --create /dev/md0 --level=1 --raid-devices=2 missing /dev/sdb2

Once the RAID was up and running I created the /etc/mdadm.conf file so that it would activate the RAID device on boot. Once the device was created I copied all the data from the running root filesystem to the /dev/md0 device. The only directory that I didn't copy was the /proc directory. When I rebooted the machine I had a kernel panic and the system couldn't find /dev/root. I would greatly appreciate it if someone could provide some information/tips regarding the problem.

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General :: Hard Drives Information / Can To Find RAID Level?

Apr 22, 2010

I know my Linux Servers have RAID but I want to know

1. Can I find RAID level?
2. how to find Disk information...I mean if it's not possible to get RAID Can I get how many hard drives and the real size?

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Sep 16, 2010

How can I mirror drives on the hardware level? I have a Sun X2270 server with 4 1 terabyte hard drives and need to mirror two drives.

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General :: Squid Proxy Server In Centos 5.5 Final Configuration?

Apr 12, 2011

today i encountered centos 5.5 final server with a squid configured to block facebook from 9am to 4pm. i have tried to follow up the steps but am stack where time restriction is done and there is no proxy configuration done in the browser. the ip address of the server is being used as the default gateway.

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Feb 23, 2010

I'm running Mandriva 2010.0 as a web server, i had 2 HDD in the erver. i dedicate 1 HDD just for LOGS and system backup (160 GB). i would like to change the log destionation directory from /var/log/httpd (defaults) into /backup/log/httpd how can i do that.? coz i couldn,t find the configuration in the webmin. that log would be useful for webalizer/awffull statistic in several days ahead.

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Feb 16, 2010

I'm using rsync for a backup-sript at the moment and want to keep all files. The files are always unique, so I want to rsync without delete any file on the destination.

I've tried with --no-delete and --max-delete=0 but nothing seens to work. Is there even a possibility to do so?

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Server :: How Long Does Hardware Raid Card (raid 1) Take To Mirror 1 TB Drive (500gb Used)

Mar 22, 2011

How long does hardware Raid card (raid 1, 2 drives)take to mirror a 1 TB drive (500gb used)?Is there a general rule of thumb for this?4 hours? 12 hours? 24 hours?

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CentOS 5 Hardware :: Connect A RAID Box To The Server Via LSI 8880EM2 RAID Controller

Aug 3, 2010

I am trying to connect a RAID Box to the server via LSI 8880EM2 RAID controller.The raid box is FUjitsu Externus DX60 with raid 1 configured.The server is Fujitsu Primergy SX300 S5 with LSI 8880EM2 RAID card.The external raid box is being recognised by the raid controllers bios.

The server runs CentOS 5.5 64bit. I have installed the megaraid_sas driver from LSI website and MegaCLI utility but CentOS still fails to see the box.MegaCLI utility, when launched from CentOS, recognises the raid box, CentOS does not(no mapping being created in /dev).

I have also tried to create a logical RAID0 HDD on one physical HDD(as seen by MegaCLI) with MegaCLI utility in CentOS.The result was success and the new logical drive could have been used, but when restarting the server, the controllers' bios fails with an error (not surprised(one logical RAID0 on one physical HDD)) and configuration is being erased.

Has anyone tried connecting 8880EM2 controller to a raid box with raid configured on the box, running it all under CentOS and what were the results.

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General :: Run The Same Command(s) On The Many Destination Servers From Source Server?

Jan 4, 2011

I am trying to run the same command(s) on the many destination servers from my source server.source server user "report" ssh keys are added to all destination hosts.

hosts.cfg:
----------
gadikota_dev01

[code]....

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Server :: Backup / Restore - Importing LVM Setup At Destination

Jun 8, 2009

I am doing a LVM replicate to another server.
Example: server1.foo.com has / , /boot , swap and few LVM partitions. All are in /dev/sda disk of size 80GB. /dev/sda5 is a LVM partition which has only one vg00 and it has 2 LV's (/var and /usr) and a SAN storage connected to this server which has around 500GB of single partition(a LV partition) called /data and its under vg00 .

Now I have build another server called "server2.foo.com" with same RedHat OS version - RHEL 4 and want to import the same LVM setup at destination. Down time or unmounting the filesystem is not a problem (but am trying to reduce the down time as much as possible). Is there any way that I can take a proper snapshot of whole LVM disk and restore with same setup at destination without losing the data and the lvm file system layout?

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Ubuntu Networking :: Internet Connection In 8.04 Server Edition - Destination Host Unreachable

Jun 8, 2010

i have a problem with my internet connection in ubuntu 8.04 server edition. if i ping to: [URL]... i get: Destination Host Unreachable but when i ping to my gateway or other pc's in my network no problems occur.

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OpenSUSE :: Move Transparently Between Run Level 3 And Run Level 5 As Autologin User?

Aug 10, 2010

I've been able to kludge a kill script which finds the correct pid for the kdeserver (or gnome server) after my system comes up in run level 5 so I can drop back to run level 3 mode. Lots of experimentation showed me that using telinit 3 and telinit 5 would occasionally leave the video memory in a mess and I would have the black screen of death.

I set the security parameter setting to autologin for me since I am the only user of my machine, but I still have to kludge the default setting under sysconfig (the DEFAULT_WM) under Window Manager to pick a certain window manager, so it takes time to manually switch the desktop.

Right now I can leave the gui and drop back to cli, but painful experimenting showed me that killing the X server is a no no. Right now I kill the kde server, which sends the SIGTERM to the X windows manager, which then figures out that it has to shut down.

Questions: Is there a better way of doing this? Apparently openSUSE figures that we have multiple users logging into the gui desktop, so the gui is always kept running and a login window with the desktop manager option forces the user to login in. With autologin, this never happens, but no choice of desktop is possible on the fly.

Can some type of script be set up to painlessly enable this to happen? And what is the best way of bringing either the Gnome or KDE desktop manager down gracefully? I do get lots of error messages as the system attempts to recover and X shuts down. It appears that apparently the single user with autologin is left out in the cold.

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Feb 6, 2010

I want to install a software called TinyOS which is an operating system designed for wireless sensor embedded networks in my account. The problem is it has instructions to install the software as an administrator since i'm not an admin of the department network i can not able to install. Is there any method to install this software as an user level rather than admin level.

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May 8, 2010

How can I adjust the levels at which the battery is considered to be critically low?ight now it seems this is set at 5 or 10%. I want to make it 20 or 25%This is for Gnome. I am using Lucid x86

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Jan 15, 2011

hello everyone, im having a problem when my computer enters in the run level 4 as the default when i start slackware. The strange thing is that it not seems that is a X window problem, it looks like more like a configuration problem in some part of the kde script to initialize the log in, because if i manually start the X service it works fine, i dont know what is the source. Thank you in advance for the help.

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Jan 6, 2009

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Sep 24, 2009

I need to know how to configure the address of the next level DNS server in my BIND server. im in a FEDORA 10 system.

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Server :: Convert Raid 1 To Raid 10?

Jul 21, 2011

I am looking to convert a raid 1 server I have to raid 10. It is using software raid, currently I have 3 drives in raid 1. Is it possible to boot into centos rescue, stop the raid 1 array. Then create the raid 10 with 4 drives, 3 of which still has the raid 1 metadata, will mdadm be able to figure it out and resync properly keeping my data? or is there a better way to do it?

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Server :: Tur A Non-RAID System To RAID?

Mar 24, 2011

I have a box that doesn't have a Raid controller or a software raid running currently. I would like to make it a RAID 1. Since it seems there isn't any IDE RAID controllers hardly around, I have another HD that is the exact model as the drive currently in the box running CentOS. Can I some how add the second drive and get the box to mirror from here own out? The box gets really hot and I want to be ready for a HD failure.

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Server :: Administration - Get Entry Level Job

Jun 13, 2011

I am a M.C.S.E certified professional and i want to become a linux admin, presently i am pursuing rhce from a reputed institute , how can i get entry level job in linux , which topics i should be very clear.

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Ubuntu Servers :: RAID-5 Recovery (spare/active) / Degraded And Can't Create Raid ,auto Stop Raid [md1]?

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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OpenSUSE Network :: "iwlist S" Output - Quality / Signal Level And Noise Level Mean?

Jul 21, 2010

[code]...

you can find a cutout of an output generated by "iwlist s" command for a cell. Does anybody know what Quality, Signal level and Noise level mean? What is the definition of them? I searched for it and could not find good information on it. What do these Extra:*** fields for? What does it show in the example above? How were those values computed?

[code]...

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Fedora :: Can't Switch To TTY Or Run Level 3 From Run Level 5

May 12, 2009

Hi Guys,
here is my scenario:

I am running F10 x86_64 with Nvidia Quadro FX 3400.
I installed the drivers and it worked just fine. No errors generated according to Nvidia log files.
However, while in run level 5 when I try to switch to run level 3 by typing "telinit 3" or "init 3" the X server goes down and I get a blank screen. Same thing happens when I try to switch to a different tty session by <ctrl>+<alt>+F2 (or any F key for that matter).
I also noticed that when I shut down my system I can't see any more the screen where services are shutting down and their status ([OK] or [failed]).

Would appreciate your help on solving this issue.

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Red Hat :: Keyboard Not Working At Run Level 3 And 5, But Ok At Level 2

Jun 17, 2010

Hey Guys, I'am new here and request your help on this:
After installing emacs and a few dependencies on my RHEL 5, on restarting the system, the keyboard was not able to work. I restarted several times in vein.

However, when I start in single mode, it works perfectly. I have tried looking for a solution from google, but in vein.

Kindly help...

Regards, Andrew

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Mar 21, 2011

I am trying to edit /etc/inittab so that I can make run level 3 as my default runlevel but whenever I try to edit it, it opens in read only mode. I am logging in as root still not be able to edit the file. It still shows read only. Also tried chown/chmod to change the file permission but it won't let me change anything related to inittab. Also checked the /boot/grub/grub.conf to see if the file system is mounting as ro. Also tried with rw but didn't work.

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General :: Delete Top Level Directory And Have Contents Simply "move Up A Level"?

May 27, 2010

I have a directory that has a another directory inside it. The top directory is rather redundant since it only contains the one other one. Is there a way to delete the top level directory and have the contents simply "move up a level"?

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Jun 10, 2011

I played the apprentice sorcerer trying to install mysql workbench by my own and I messed up the system 11.1 by removing accidentally some libraries and decided to jump on 11.4 by using the update feature from the DVD. It worked all good (it seems at least: I didn't lost any datas and all my servers are running ok) but there is no more X11 server (kde) running for the run level 5.

I checked the inittab file and it is set to 5. I can log on root account and now I'm searching how to install kde on this new 11.4 system. I didn't yet tried the failsafe option at boot. Is there a way to set up kde from the internet, my wifi connection is ok ? I saw that yast was not installed nore zypper nore yum. Do I first try another update to fix it (if possible) from DVD?

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