10
votes
3answers
946 views

Should I avoid putting two SSDs in a RAID1 configuration due to performance degradation?

I have a workstation system that will have two 64GB industrial SSDs, and the plan is to have both disks in a RAID1 configuration for redundancy which is set up in the kickstart. The system will be ...
5
votes
4answers
654 views

How do I configure RAID 5, especially stripe size, with 24 x 1.2 TB drives for CentOS 6?

For a Dell R920 with 24 x 1.2TB disks (and 1TB RAM), I'm looking to set up a RAID 5 configuration for fast IO. The server will be used to host KVM VMs that will be reading/writing files of all sizes, ...
0
votes
1answer
265 views

Kernel panic after boot Centos 6.5 HP DL320 B120i HPVSA

Im working with a new HPDL320 micro server (gen8-2) with a HP Dynamic array B120i My problem is after the setup. I provided the DiskDrive to the installer and everything is fine. at first i used kick ...
2
votes
2answers
3k views

How to monitor the hard disk status behind Dell PERC H710 Raid Controller with CentOS 6?

I have a Dell server running CentOS 6 using PERC H710 Raid Controller card with Raid 5 setup and I want to monitor the hard disk failure/working status behind the Raid Controller. Then I should be ...
2
votes
0answers
51 views

How is that possible that file was changed without date modification? [closed]

I'm using Blade Server with CentOS 6.5 (ext4) installed, disks combined in raid6, connected in a storage area network. Somehow some of my files become corrupted from time to time without updating the ...
0
votes
1answer
80 views

mdadm RAID 1 config deleted

one of our huge production servers crashed this morning due to a HDD failure on port 0 (the bootable one). That server was running CentOS 6.5 in RAID 1 with mdadm. Although, a trainee changed the HDD ...
4
votes
1answer
400 views

CentOS 6.5 mdadm Raid 1 - Kernel Panic during raid data check

I have a brand new CentOS 6.5 install with two (mounted to /mnt/data) 1tb Western Digital Black drives in raid 1 with mdadm, configured via the installer. Unfortunately every now and again the entire ...
3
votes
1answer
2k views

CentOS 6.5 with HP ProLiant DL360e Gen8

I have a chance to install a new HP ProLiant DL360e Gen8 server. There are three hard drives. How do I configure RAID 1 on this type of server. Will RAID already be configured so that it will look ...
0
votes
2answers
43 views

Can I add a disk outside raid?

CentOS 6.5, Software RAID1 with 2 x 160GB As I'm running out of disk space, I want to add a third disk (1TB) that will be used for non-critical data. How can I add a extra sata disk to the OS ...
1
vote
0answers
118 views

Need help recovering RAID 6 array

My CentOS 6.5 server had its primary drive fail the other day. Our hosting company replaced the primary drive and reinstalled the OS. The system is up and running, but the 15TB of RAID6 storage isn't ...
0
votes
0answers
34 views

What is the issue with the boot setup on this raid array?

After a secure erase of /dev/sda (Samsung 840 Pro) I had to setup grub on /dev/sda2 (for some unknown reason the /boot partition is the second one). So I ran something like this: grub root(hd0,1) ...
0
votes
1answer
537 views

RAID1 on existing CentOS6 Install

I have two 500GB hard drives in my server. Currently, there is no RAID configured, but CentOS6 is installed (as a bare install for now). Is it possible to set up a software RAID-1 so that both drives ...
2
votes
1answer
1k views

What is the correct way to install software RAID 1 in CentOS 6.4?

I'm going to install CentOS 6.4 on HP ProLiant ML310e Gen8 server. This server has fakeraid controller so i decided to use software raid. The problem is that i don't know how to correctly install GRUB ...
0
votes
1answer
616 views

CloudLinux server won't boot [closed]

I have a cPanel server, running Cloud Linux, it's a dedicated server that originally ran CentOS 6.4 and SoftRaid 1. I converted it to CloudLinux after a fresh re-install. I didn't have a need to ...
0
votes
2answers
381 views

Slow software raid with SSDs

We have moved a web application with an Oracle database to a new server because the old one was dying. The old server had two mirrored hard discs plus a separate non-mirrored SSD for the Oracle ...
0
votes
1answer
82 views

Does the built-in CentOS software RAID distribute writes?

Will I see a write performance increase going from single disk to CentOS Software RAID10? Any industry estimates on the % increase?
-2
votes
2answers
146 views

What if Areca 1212 Raid card fails?

So I have a basic server: i5, 4GB ram, Areca 1212 Raid card, 1x sata 40GB HDD (for OS) connected to motherboard sata, 4x 2TB HDDs all configured into RAID5 (for /home data) connected to Areca Raid ...
1
vote
1answer
730 views

Linux - dmraid (or mdadm) - Rebuild RAID 10

A while ago I had a raid10 config crap out on me, and am now just getting around to trying to salvage the array so I can rebuild and move on with my life. Basically a drive in each subset failed, ...
-2
votes
2answers
72 views

Centos RAID1 installation

I have installed Centos 6.2 with RAID1 support, after installation I have checked RAID1 by removing one by one Hard disk, Os booted and worked. So after I created new users, installed LAMP, ftp and ...
1
vote
1answer
216 views

Managing PERC 6/i and P800 in the same system under CentOS

I have a CentOS/Xen VM server running on a PE T710 with a PERC 6/i, which has a 6 disk RAID 10 + 1 hot spare. The chassis only holds 8 3.5" disks, and so I'm looking for an aftermarket (used/eBay) ...
-1
votes
1answer
223 views

How to check 3ware raid controller's health?

I have a 3ware controller and I would like to check the health of the drives and the raid itself. I found this blog: http://www.cyberciti.biz/faq/linux-check-health-of-3ware-raid-array/ but I ...
1
vote
1answer
152 views

100% SSD usage Linux

Every 20-30 seconds my HDD usage goes to 100% (iostat). iotop is showing that [flush-8:0] is using 99% HDD during these times. In between HDD usage is 1-10%. iostat output: 04/22/2013 08:58:44 AM ...
0
votes
1answer
360 views

Mirroring iSCSI target to slower drive, asynchronous RAID or block-level replication?

I'm planning on setting up a test iSCSI export on my NAS which will be used by a KVM virtualisation host to store all guest volumes and data. My NAS box is a self-build running CentOS. The device ...
1
vote
2answers
693 views

How to install CentOs 5.8 on 3TB disk with RAID 1 on Hetzner EX 4S (10 TB) server?

I have installed centos 5.8 with Hetzner server rescue mode but its disk parttion table is in MSDOS formate which does not support more than 2 TB space of disk so i need to change the partition table ...
-2
votes
1answer
183 views

─░nstall Linux server in 13TB hard disk

Hi i have a server which has a 13TB hard disk with Raid 5. My problem is when i try to install CentOs it sees only 2TB of disk. How can i use parted insted of fdisk in install process? Or if you have ...
0
votes
1answer
46 views

Server upgrade configuration - raid vs. multiple drives vs. combo raid / backup

We're upgrading our Linux box, and moving from CentOS (quad core AMD, 8GB RAM, SATA drive) to RedHat OS (dual quad core Xeon, 8GB RAM, SAS drives) and was wondering... what will provide the best ...
0
votes
1answer
401 views

How to disable the RAID in x3400 M2

Hi I just wanna disable the default RAID in my server IBM System X3400 M2 Server(7837-24X),i have 3 disk drives SAS. I want to make them a JBOD "Just a Bunch Of Disks", because I want to install in ...
2
votes
1answer
755 views

Linux server not booting after rebuilding software RAID

I have a dedicated server at 1and1 with a software RAID. I believe it's running CentOS. The hardware team at 1and1 replaced the secondary hard drive (sdb) and then I followed these instructions to ...
0
votes
1answer
334 views

Raid 10 - Very slow [closed]

I have Software Raid 10 setup, it has been working great a few months. When I did a quick HD speed test: dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync It is taking forever and I had to ...
1
vote
1answer
599 views

How to detect hard disk failure?

So, one of my servers has a hard disk failure. It's running software RAID, the system locked up and according to /proc/mdstat (and /var/log/messages), it's really down: Personalities : [raid1] md2 : ...
0
votes
1answer
148 views

Hardware RAID in CentOS 6.2

I have a ServeRAID-BR10il SAS/SATA PCIe Controller RAID O and 1 Standard. Do you have any suggestions how to install it in CentOS 6.2? All the tutorials I found are only software RAID. Hope you guys ...
1
vote
1answer
513 views

raid10 in mdadm reports incorrect “Used Dev Size”

I previously had a raid5 with mdadm using four 2TB drives. I've recently disassembled the raid and created a raid10 with six 2TB drives, but mdadm --detail is showing "Used Dev Size" as only 2TB (the ...
0
votes
1answer
217 views

file read performance degrades as number of files increases

We're observing poor file read IO results that we'd like to better understand. We can use fio to write 100 files with a sustained aggregate throughput of ~700MB/s. When we switch the test to read ...
-4
votes
2answers
85 views

Raid array showing only the capacity of one disk [closed]

I've a dedicated server with an raid array with two disks of 1TB each, this is what I get with mdadm --detail /dev/md1 /dev/md1: Version : 1.1 Creation Time : Wed Aug 1 20:20:14 2012 Raid Level ...
0
votes
2answers
964 views

smartd: Device: /dev/sda, FAILED SMART self-check. BACK UP DATA NOW

System: Centos 5.5 64bit RAID: Linux Soft RAID with 2 Disks Mirror Smartd complains about the disk failure in system log: [root@xxx ~]# tail /var/log/messages Jul 3 10:22:45 w11 smartd[6043]: ...
2
votes
1answer
1k views

dd oflag=direct 5x fast

I have Centos 6.2 in server with this specs: 2xCPU 16 Core AMD Opteron 6282 SE 64GB RAM Raid controller H700 1GB cache NV - 2HD 74GB SAS 15Krpm RAID1 stripe 16k (OS Centos 6.2) sda - 4HD 146GB SAS ...
0
votes
1answer
136 views

Raid 1 / Raid 10 - Disk Failure

I have setup Software Raid 1 and Raid 10 using VirtualBox for testing purpose. The partition and raid setup look like this: When I deliberately remove Disk2 and restart a server, it booted to OS ...
6
votes
1answer
1k views

Raid 1/10: Kernel panic- not syncing: attempted to kill init

I have setup Raid 1 & Raid 10 in Virtual Box for learning purpose. The following Partitions for 4 Hard Drives: I make a 100mb partition (/boot) on four drives and make that a raid 1 partition. ...
1
vote
1answer
2k views

How do I mount a raid disk

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 ...
9
votes
2answers
1k views

How to check CentOS 6 Server VM Host after a power falure?

This afternoon, someone at our office decided to pull the plug out of our server because it was storming outside. They didn't shut it down, they just pulled the plug out while it was running. The ...
2
votes
1answer
759 views

Where did the free space go?

I have installed CentOS 5.7 64 Bits in my server which has 4x300 GB SAS drives on hardware RAID 10. At the installation, I chose default partitions. Here are the commands output: [root@server ~]# ...
1
vote
2answers
498 views

Dead software RAID CentOS 6

I have a RAID 5 array (with LVM on top) on a CentOS 6 box. The array itself is an LSI StorageTek disk shelf with 14 drives connected to the server with a fibre channel cable. After rebooting the ...
2
votes
1answer
413 views

Does my server have software RAID 1 set up?

I recently got my dedicated server it has 2x 1TB HDD's, so I asked for software RAID 1 on set-up and my provider asured that server have RAID 1 (software). I tought that if I will run RAID 1, I will ...
1
vote
1answer
196 views

Linux software RAID-5: failed drive doesn't degrade the array

I have a CentOS 6.0 install sitting in a Hyper-V VM. I'm trying out some of the software RAID features of Linux and I've got a RAID-5 array made up of virtual SCSI disks. Most of it works fine: if I ...
1
vote
2answers
544 views

RAID1 and RAID5 configuration - LVM

I have a dedicated server, which has the following: 2 x 146GB drives in RAID1 - configured 3 x 600GB drives in RAID5 - unconfigured The 2 x 146GB drives are currently dealing with everything, such ...
2
votes
2answers
95 views

Move Web Directory to Raid Array

I want to improve the performance of a web application running on Apache, so I created a Raid Array on /dev/md0. Now I need to figure out how to move the application to the array and make sure that ...
2
votes
2answers
242 views

CentOS 5.5 doesnt boot - possible failed RAID controller or hard drives?

CentOS 5.5 does not boot past this point: This machine has an Areca RAID controller with the OS on a RAID 1 mirror made from 2 SATA drives. There is a second array as well; a RAID 5 group with 4 ...
3
votes
1answer
464 views

Software RAID1 ready to fail - How can I degrade manually?

I have a Centos 5.4 server in production with 2 drives in software RAID1. The last days /var/log/messages has a lot of messages, showing that one of the drives is ready to fail: Sep 23 00:48:38 ...
0
votes
3answers
361 views

How to add existing /home on MDADM RAID to new LVM based OS install

Have (32-bit) Centos 5.6 file server with 2x1TB HDD/ext3 in MDADM RAID-1 as follows: Disk /dev/sda: 1000.2 GB, 1000204886016 bytes Device Boot Start End Blocks Id System ...
1
vote
4answers
4k views

mdadm puts wrong devices in array on boot Correct mdadm.conf file

Upon boot it stuffs it up every time: [root][centos ~] cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] md127 : inactive sda[2] sdb[3] 1953524992 blocks unused devices: ...