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  • choosing the right RAID level

    - by student
    Recently, we bought a "HP-DL380 G6 Server" with 6 146GB (SCSI)HDD for our colleague course management application and website with 10000 daily visitors. we want to choose the best RAID level. how can we choose the right RAID level ? what is the best RAID level for our application ?

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  • choosing the right RAID level

    - by student
    Recently, we bought a "HP-DL380 G6 Server" with 6 146GB (SCSI)HDD for our colleague course management application and website with 10000 daily visitors. we want to choose the best RAID level. how can we choose the right RAID level ? what is the best RAID level for our application ?

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  • How do I mount a raid disk

    - by Devator
    So I screwed up my grub.conf file on a CentOS system and I'm in recovery right now (it's only a test dedicated server). My disks are /dev/sda1 and /dev/sdb1 (RAID 1). Now I need to mount /dev/sda1 and make changes to the grub file, however those changed need to be reflected on the second disk aswell. How do I mount these RAID disks? I can mount one using mount -t ext3however it will damage the RAID array.

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  • RAID - software vs. hardware

    - by Robert MacLean
    I have always used hardware based raid because it (IMHO) it's on the right level (feel free to dispute this) and that OS failures are more common to me than hardware issues. Thus if the OS fails the raid is gone and so is the data, where on a hardware level regardless of OS the data remains. However on a recent Stack Overflow podcast they stated they would not used hardware raid as the software raid is better developed and thus runs better. So my question is, is there any reasons to choose one over the other?

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  • Re-assembling the RAID-5 array reboots my CentOS-5 machine

    - by xraminx
    I have 3 HDD's, each divided into 3 partitions. I had created a RAID-1 for boot partition md0 created from sda0, sdb0 and had also created two RAID-5 arrays: md1 created from sda1, sdb1, sdc1 md2 created from sda2, sdb2, sdc2 It used to work fine but one day I had to power off the machine (cold reboot) to get any response from the machine. After that, when the system started booting, it tried for a while to reconstruct the RAID arrays but after a few minutes it crashed silently. I booted the system in linux rescue mode from the DVD and tried to re-assemble the RAID devices manually. I was able to re-assemble md0 and md1 using: mdadm --assemble --scan /dev/md0 mdadm --assemble --scan /dev/md1 But when I try to re-assemble md2 using: mdadm --assemble --scan /dev/md2 the system reboots silently again. How can I fix this problem?

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  • Replacing all disks in a non-OS RAID 5 volume

    - by molecule
    Hi all, We currently have a server with 8 x HDD slots. It is a HP DL380G5 with a P400 controller. 2 x HDD are in a RAID 1+0 config and this hosts the OS. 6 x HDD are in a RAID 5 config and holds an Oracle DB. Basically the RAID 5 volume is running out of space and we would like to swap all 6 with higher capacity disks. Excuse my ignorance as I am pretty new to this... I believe we will need to backup the data, delete the RAID volume, insert the new disks, recreate the volume, and restore the data. 2 questions: Do we need to worry about the OS partition or is it completely independent so we can simply take out the 6 and insert 6 new disks and get the controller to recognize the 6 new disks and form a new RAID 5 volume? We should not need to reinstall OS or Oracle correct? Since we are going to restore the data on the volume from another source (our vendor will take care of this) but we would like to keep the existing data on the 6 disks just in case we run into issues and want to fall back, is this possible? Thanks in advance.

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  • looking for a solution for a Software Raid on my XP computer

    - by Yigang Wu
    Recently, I purchase 2x1TB drives for my XP computer, I want to use RAID 1 for the redundancy, but the motherboard is little old and can't support that. Some articles introduce how to make it happen in windows xp, but all are failed in my machine. http://www.tomshardware.com/reviews/windowsxp-make-raid-5-happen,925.html I would like to know is there any existing software RAID solution available in market? Thanks in advance.

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  • Linux software RAID 10 implementation

    - by fabrik
    Hello there! I don't want to force anybody to make it on behalf of me but trust me: i've looked hundreds of sites and i can't find a good starting point for this. I have 4x500Gb HDD's which i want to set up in RAID 10. The most promising description is here, but it's a little old and unclear for me, above all i prefer Debian over Ubuntu (i know there are slight or no differences). Is it possible to build RAID 10 with Debian's installer or i need to build RAID 1 first in the installer then use mdadm later? What is the best practice for building software RAID 10 under Linux (Debian)? Thanks for your time, fabrik

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  • raid 6 vs raid 10? which would you choose.

    - by dasko
    my choice would be raid 6 for a file server since you can lose two drives and it does not matter which set of two can die. from what i understand with raid 10 you can lose two drives but if they happen to be off the same raid 1 then you are a out of luck? any suggestions? basic file server with about 200gb of data and it would act as a single point of backup for other workstations and servers. thanks in advance.

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  • Mac Pro Boot Camp w/ RAID card

    - by churnd
    If I configure a Mac Pro with a RAID card and two 15k RPM drives, and leave the drives JBOD (no RAID configured), can I install Windows on the second drive? I guess the question really is, does Windows recognize the RAID card? I know it's probably just a rebadged LSI or Adaptec but wanted to see if anyone's actually done it...

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  • Cannot load from raid with grub

    - by Andrew Answer
    I have a RAID1 array on my Ubuntu 12.04 LTS and my /sda HDD has been replaced several days ago. I use this commands to replace: # go to superuser sudo bash # see RAID state mdadm -Q -D /dev/md0 # State should be "clean, degraded" # remove broken disk from RAID mdadm /dev/md0 --fail /dev/sda1 mdadm /dev/md0 --remove /dev/sda1 # see partitions fdisk -l # shutdown computer shutdown now # physically replace old disk by new # start system again # see partitions fdisk -l # copy partitions from sdb to sda sfdisk -d /dev/sdb | sfdisk /dev/sda # recreate id for sda sfdisk --change-id /dev/sda 1 fd # add sda1 to RAID mdadm /dev/md0 --add /dev/sda1 # see RAID state mdadm -Q -D /dev/md0 # State should be "clean, degraded, recovering" # to see status you can use cat /proc/mdstat After bebuilding completion "fdisk -l" says what I have not valid partition table /dev/md0. So 1) "update-grub" find only /sda and /sdb Linux, not /md0 2) "dpkg-reconfigure grub-pc" says "GRUB failed to install the following devices /dev/md0" I cannot load my system except from /sdb1 and /sda1, but in DEGRADED mode... This is my partial fdisk -l output: Disk /dev/sdb: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000667ca Device Boot Start End Blocks Id System /dev/sdb1 * 63 940910984 470455461 fd Linux raid autodetect /dev/sdb2 940910985 976768064 17928540 5 Extended /dev/sdb5 940911048 976768064 17928508+ 82 Linux swap / Solaris Disk /dev/md0: 481.7 GB, 481746288640 bytes 2 heads, 4 sectors/track, 117613840 cylinders, total 940910720 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/md0 doesn't contain a valid partition table Anybody can resolve this issue? I have big headache with this.

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  • Ubuntu Software RAID 0 on AWS Does Not Survive Reboot

    - by Eric J.
    I'm experimenting with creating a software RAID 0 device from 4 EBS volumes on Ubuntu 9.10 running at Amazon AWS following this guide: http://alestic.com/2009/06/ec2-ebs-raid The device appears (and according to SysBench is 3.5x faster than a regular attached EBS volume). Problem is, when I reboot the instance, all files on the RAID device are gone. The device is available and mounted where expected, but contains no files. I am able to write new files to it, which survive until the next reboot.

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  • Raid 5 and Power Supply damage?

    - by Tronic
    Hi. Because I build a RAID 5 atm, I wanted to ask, what would happen if the server with a raid 5 in it (like 4-5 hdds) would have a power supply damage? Can I just switch the power supply and my data is safe and backup again or will there be a raid damage as well? Thanks in advance. Regards.

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  • Commercial NAS RAID1 disks moved to Software Raid system?

    - by Rolnik
    I've got a couple of commercial NAS boxes and I'm wondering if they (ReadyNas duo, DLink DNS-323) or any other NAS is suitable for having their RAIDed disks moved to a software-based NAS. To be specific, I'm a big fan of the (largely) Debian-based Ubuntu. Can the aforementioned NAS drives be migrated to Ubuntu (e.g. using the mdadm Linux command)? Secondly, is there any commercial NAS that can be migrated over? Incidentally, here is a link to somebody who succeeded in a migration: http://www.linuxquestions.org/questions/slackware-14/moving-raid1-drives-into-computer-with-same-md-numbers-862312/ My specific scenario I'd like to prepare for, is the eventual (sudden) death of one of the NAS motherboards.

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  • Raid 5 with hot spare or RAID 10 with no hot spare?

    - by Boden
    Yes, this is on of those "do my job for me" questions, have some pity:) I'm at the limit for what I can do with the number of hard drives in a server without spending a substantial amount of money. I have four drives left to configure, and I can either set them up as a RAID 5 and dedicate a hot spare, or a RAID 10 with no hot spare. The size of each will be the same, and the RAID 5 will offer enough performance. I'm RAID 5 shy, but I also don't like the idea of running without a hot spare. I'm not so interested in degraded performance, but the amount of time the system is without adequate redundancy. The server and drives are under a 13x5 4 hour response contract (although I happen to know that the nearest service provider is at least 2-3 hours away by car in the winter). I should note that the server also has two RAID 1 arrays which would also be protected by the hot spare. Why don't they make drive cages with 9 bays! Heh.

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  • Windows Server 2008 - RAID 5 Fails on Reboot

    - by Adam
    Hey, I've got an install of Windows Server 2008 Enterprise. It's running software RAID-5 with five disks. The disks were originally formatted under Windows Server 2003, but came up fine once I installed Windows Server 2008. The issue I'm having is that every time I reboot the server, the RAID comes up with a "Failed Redundancy" - the data stays available. I have 4 disks on a PCI SATA controller, and one of the disks connected to the motherboard's on-board SATA ports. (The other on-board port has the system disk connected.) I was having Disk #4 fail consistently, so I tried swapping the cables on the controller end. I swapped the on-board RAID disk with one on the PCI controller. Same issue now, expect with disk #1. Once the system's up, I can reactivate the RAID, it will resync for a while, then go to "Healthy", and will stay that way for an indefinite amount of time - until I reboot. As soon as I reboot, the disk drops again. I've ruled out disk + cable with the recabling. I don't believe it would be the controller as it seems to work fine most of the time - only failing on reboot, and the other port on the same controller connects the system disk - which is clearly working. I did look in the event log, but didn't see anything particularly relevant (although I didn't know what I was looking for - just looked for anything with a "Warning" or "Error" symbol that looked disk-related :)). I'm not particularly familiar with RAID on Windows, does anyone have any idea why this might be doing this? Any idea how to fix it? Any suggestions appreciated! -- Adam

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  • Removing raid 1 (mirroring) and leaving data on both drives

    - by ajma
    Hello, I have two drives in a raid 1 (mirroring) array. Hardware raid using whatever is built into an Intel motherboard. (asus P5BE) I'd like to remove one drive but keep the data in both (I want to put one of the drives into another machine). Can I go into the raid configuration and remove the array and have the data remain?

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  • Can a RAID 0 disk be rebuilt

    - by Rogue
    Recently one of the hard drives of one of my RAID 0 configuration gave an error. What do I do now I'm hoping that I can replace that faulty disk with a new hard drive and that the RAID can rebuild itself. (using Intel Matrix Storage Console) Is this possible? Though I doubt it. Is there anyway that I can rebuild the RAID? or have I lost all the matter on it. TECH INFO: I have a software raid on an Intel DG965WH motherboard and the current operating system is Windows

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  • Running RAID on an internal storage drive

    - by Johnny W
    I am running Windows 8 on an SSD, and it's all running swimmingly, but I want to put my documents on a "normal" HD running under RAID 1. I have four SATA 3GB/s ports on my motherboard (my Windows 8 SSD drive in on a different 6GB/s controller). All four are used (1 Bluray Optical Drive, 1 Spare HD, and the 2 I wish to turn into a RAID 1 drive. In my BIOS I can only change settings for the entire controller, not just ports. So my question is: If I turn these four ports into a RAID controller, will that negatively affect the non-RAID hardware plugged into it? I.e. Will a HD or Bluray drive be slower/incompatible with being plugged into a non AHCI SATA port? Thanks.

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  • Can a RAID 0 disk/config be rebuilt ?

    - by Rogue
    Recently one of the hard drives of one of my RAID 0 configuration gave an error. What do I do now I'm hoping that I can replace that faulty disk with a new hard drive and that the RAID can rebuild itself. (using Intel Matrix Storage Console) Is this possible? Though I doubt it. Is there anyway that I can rebuild the RAID? or have I lost all the matter on it. TECH INFO: I have a software raid on an Intel DG965WH motherboard and the current operating system is Windows

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  • downsides to running RAID on unmatched drives?

    - by NoCarrier
    I've got some generic RAID controller built into my motherboard and I want to build either a RAID 5 or RAID 0+1 array. What are the disadvantages of running unmatched drives? Like 4 different brand 7200rpm 500gb drives? This would determine whether I look around for whatever used drives I could get my hands on vs. paying extra for a set of matched identical drives.

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  • Linux RAID: Replacing Failed Drive...permanantly

    - by user137519
    Okay, odd question here. I have a server with RAID 5. A drive failed, in a really physically in a really odd way. On the machine it boots and is seen by the BIOS but...no partition can be seen on the drive consistantly (in and out). 2 out of 3 drives working...I made new spare disk and added it, RAID 5 rebuilt clean. All appears well but...when I reboot it keeps trying to use the 2nd drive which doesn't give any partition data, so of course the RAID 5 gets 2 out of 3...again. The status of my drive is as follows: /dev/sda2:Good /dev/sdb2 (drive has physical problem so no partition data) bad, /dev/sdc2:good /dev/sdd2:good. Every time I reboot the mdadm system seems to keep trying to use /dev/sdb which has physical failure (although spins and is detected). /dev/sdd is the new drive I created. I added /dev/sdd to the raid and it rebuilds the raid but this action isn't memorized upon reboot so it keeps listing /dev/sda and /dev/sdc but doesn't use the perfectly good /dev/sdd until I re-add manually. I've tried removing the dead drive with the mdadm tool, but as it cannot see /dev/sdb paritions it will not fail or remove it (says partition doesn't exist). the /etc/mdadm.conf was automatically made on the original OS install which only lists: DEVICE partitions MAILADDR root ARRAY /dev/md2 super-minor=2 ARRAY /dev/md0 super-minor=0 ARRAY /dev/md1 super-minor=1 Basically just the raids to use on boot. I need to remove this semi-dead drive (/dev/sdb) but I'd prefer to know why this is happening before I do. any ideas or suggestions. I supposed I could attempt to clone/replace /dev/sdb (the partitions on drive show up, then disappear shortly after) but given the partition "chester cat" behaviour this seems risky to me and as I have a working "spare" it seems unnecessary. Thanks in advance for your insight.

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