RAID, an acronym for Redundant Array of Independent Disks (sometimes incorrectly referred to as Redundant Array of Inexpensive Disks), is a technology that provides increased storage functions and reliability through redundancy. -Wikipedia

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load balancing in multiple hardware raid arrays - soft raid 0 acceptable?

We have a central storage server (PowerEdge R720) serving shared files to an HPC cluster, and it has two hardware RAID controllers attached (PERC H810, each driving 2 MD1200 enclosures filled with ...
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39 views

why are zfs on linux transfer rtates reported incorrectly after expanding array?

I have upgraded the drives in a 4 drive Raidz array in a NAS server and the array has auto expanded to the new size. In testing transfer rates from the NAS server now I observe that when performing ...
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53 views

Raid 1 seeding to speed up identical installs

I was thinking of installing Ubuntu on one of our Dell servers in a RAID 1 configuration, then using the mirrored drive as the primary drive in a second identical server with another RAID 1 setup. ...
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524 views

CentOS 7: GPT and software RAID 1 without 'biosboot' partition

I have a CentOS 6 server with software RAID1 (2x3TB): - sda # parted /dev/sda unit s print Model: ATA TOSHIBA DT01ACA3 (scsi) Disk /dev/sda: 5860533168s Sector size (logical/physical): 512B/4096B ...
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326 views

Solaris 9: Degraded mirror unmanageable with raidctl after drive replacement

We have a pair of Sunfire v20z's (WITH LSI MPT raid) that have each had one drive in their mirrors die. bash-2.05# cat /etc/release Solaris 9 4/04 s9x_u6wos_08a x86 ...
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140 views

RAID1 disks “forked”, now duplicate

I have got a server hosted by OVH, which is configured to have a soft RAID1 array, /dev/md0, that holds a LVM PV. There is another /dev/md1 array, which was supposed to be the /boot, but which is ...
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4k views

How to recover an mdadm array on Synology NAS with drive in “E” state?

Synology has a customized version the md driver and mdadm toolsets that adds a 'DriveError' flag to the rdev->flags structure in the kernel. Net effect - if you are unfortunate enough to get a array ...
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545 views

mdadm error: found two disks with the number 0

Im running a server deep in the forest , and after a hard disco failure i got this error. error: found two disks with the number 0. It a server with 2, 1 TB disc in raid 1 with mdadm 0.9 SDA failed ...
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332 views

Windows Deployment Server Answer Files for PC's with RAID Controllers

I currently have a Windows Deployment Server running on Windows Server 2008 R2 Standard, and so far it has worked without any issues. I am able to capture and deploy images to the majority of the ...
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277 views

Convert single O/S disk to RAID 1 - Ubuntu 12.04 LTS

I have a server running Ubuntu 12.04 LTS with only a single drive. There are 2 more empty hot swap bays in the chassis. I want to add a little redundancy by adding a RAID 1 to the system. The ...
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233 views

HP DL380 G7 RAID controller detecting bays incorrectly - port or mobo?

I've been passed a DL380 G7 which appears to work fine (all usual checks come back OK, Linux boots OK, LV creation is OK and disk access is OK) -- except the left hand four bays connected to port 1 of ...
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221 views

raid 5 mdadm drive dropped whilst growing

I have a 4x 2tb raid 5 mdadm array which I had begun to grow onto a 5th disk. ~# mdadm --add /dev/md1 /dev/sdb ~# mdadm --grow /dev/md1 --raid-devices=5 midway through the grow I recieved this in ...
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158 views

FreeBSD raid issue

One of my machines (FreeBSD) has lost its raid (0/ stripe). If I go [root@torry /usr/home/bclark]# gstripe list Geom name: st0 State: UP Status: Total=3, Online=3 Type: AUTOMATIC Stripesize: 65536 ...
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2k views

Calculating correct stripe size for Linux mdadm RAID10 arrays in “far” layout

I'm creating RAID10 array from 6 drives. When created in near layout, e.g. mdadm --create /dev/md2 --chunk=64 --level=10 --raid-devices=6 --layout=n2 /dev/sda1 ... Checking stripe size as ...
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216 views

Is there an alternative for the Intel WebConsole for managing the RS2WG160 RAID controler on Ubuntu?

I have a server with 16 HDs connected on an Intel RS2WG160 Raid controller and I would very much like to know the state of the disks using the Web Console that Intel provides. The problem is that ...
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441 views

How do I create a RAID10 array using EBS on Amazon?

Basing this question on information I got in Why does df shows only half the size of a RAID10 array?, how should I create a RAID10 array using EBS volumes on Amazon, in a way that will not be ...
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174 views

mdadm LBA mapping

I am trying to write a script similar to mdtrim (https://github.com/Cyberax/mdtrim) for a raid 0 software raid through mdadm. The mdtrim is for raid 1 only at the moment, and it works by writing a ...
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52 views

Unexpected LSI SAS 9211-8i RAID x8 SSD Performance

After attaching 8 850 EVO SSD to my LSI 9211-8i and creating a Windows Server 2012 R2 Storage Spaces 8 column virtual disk I copied a VHD from and to the virtual disk and observed ~300 MB/s transfer ...
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39 views

Windows Server 2003 R2 - Adaptec Storage Manager email notification not working

I'm having problems with the Adaptec storage Manager email notification. It can't send emails to recipients, always showing an ERROR message. Seems that the problem it's related to some java voodoo ...
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31 views

HP P212 RAID + Tape Library = Kernel Panic

I have a HP DL320e g8 v2 server running CentOS 7.1 (kernel 3.10.0-229.4.2.el7.x86_64). The onboard B120i SmartArray was disabled, and a PCI-Express P212 SAS HBA was installed with two identical 3TB ...
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21 views

Systematic deletion of files from RAID drive

I have a client with a Mac Pro and an two undetermined RAID storage systems from Areca, running off of an internal MRAID card. They are currently using the primary RAID array for working files, and ...
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41 views

Stress Test Hard Drive attached to a LSI controller on Hyper-V

I have a LSI 9265-8i controller running on Hyper-V. How can I stress-test the hard disks in-situ? I'd like to test things like iOPS, seek times etc.
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49 views

File IO being slow

I've rented this root server with a RAID1 mdadm software raid setup. Using dd to benchmark the file IO speed it achieves 230MB/s write (default blocksize). Certain tasks such as mysql are way slower, ...
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40 views

Can I use external SFF-8088 connector as a inexpensive way to get 2 more internal SFF-8087 ports?

Here's the scenario: I'm shopping between the LSI MegaRAID 9280-16 and 9280-24. Both cards have a single external 8088 connector, but the difference is whether they have 6 or 4 8087 internal ...
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27 views

BTRFS new device cannot be added

I have a raid10 setup with btrfs with 5 disk currently: Total devices 5 FS bytes used 6.89TiB devid 1 size 3.64TiB used 2.83TiB path /dev/sde devid 2 size 3.64TiB used 2.83TiB path /dev/sdd ...
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84 views

Proxmox VMs Fail to start on reboot due to unmounted drives

For whatever reason, I have to re-assemble my RAID arrays on boot, I don't know why, and Ive banged my head against my desk over that issue to much already, so I put the RAID mdadm commands in ...
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176 views

Get disk serial number by smartctl under raid0 of LSI

I'm trying to get the disk serial number of disks attached to the Centos server. When there was no raid0 (under LSI), I can get the serial number and model of /dev/sdb by: smartctl -i /dev/sdb and ...
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73 views

Partitions not recognized when installing Kubuntu 14.04 over complex RAID setup

I have three identical HDDs. Using a ROM utility, I configured the use of 90% of each of them as a RAID 5 array, and the other 10% as a RAID 0 array. That is, each array uses some area on all three ...
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277 views

IBM x3950M2 server, no drives detected during windows install

I have an IBM x3950M2 (72236MU) server that was running Server 2012. I decided to swap some drives around and reinstall from scratch with Server 2012r2. However I am unable to get the windows ...
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94 views

added new drives to raid 5 with wrong format then removed them and broke raid 5

thanks in advance for any help. In summary: I added 3 new disks to raid 5 array. Then, thinking they were not added, I removed them. Now the array doesnt work. What can I do to get back the ...
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113 views

Clone a CentOS VM on IBM x3650M2 server using Clonezilla

First off very thanks to everyone for this portal. What is am trying to do is to clone a CentOS virtual machine in VMware Workstation 10 to a physical hdd on an IBM System x3650 M2 (It's a 2U Rack ...
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104 views

Adaptec 2820SA RAID 5 cannot rebuild

I have an 8 disk RAID-5 array in degraded state. One drive failed some time ago, I replaced it, and it rebuilt and all was fine (state of the logical drive became optimal). Now another disk has ...
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985 views

Ubuntu 14.04 mdadm issues on boot

I have a 14.04 Ubuntu machine which has: 2 x SSD in RAID 1 (md0) 3 x Sata HDD in RAID 5 (md1) The machine is set to boot from the md0 device. This machine has been running fine for a month or so, ...
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348 views

SuperMicro 119-7 - Install Problems 'no device driver found'

I have a set of servers that had Debian installed, and need to have Windows Server 2012 R2. Supermicro 119-7 / 10274-WRFT+ MegaRAID SAS 9266-8i Mount R2 in a flash drive, boot from it in UEFI mode ...
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566 views

Dell PERC 6 - virtual drive goes offline because a drive went into the “ready” state

I have a Dell PowerEdge 2950 with four drives, and this raid controller (Dell Perc 6/i): lspci -nn RAID bus controller [0104]: LSI Logic / Symbios Logic MegaRAID SAS 1078 [1000:0060] (rev 04) ...
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120 views

Upgrade Raid 1 to Raid 0+1 and bootloader issue

I am trying to convert my current RAID 1 to RAID0+1 and facing issue in installing bootloader - please have a look what i am doing. My current configuration is RAID1(2*10GB): [root@localhost ~]# ...
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1k views

HP Dl360e Gen8 Not Detecting Hard Drives

I have a new HP Proliant DL360e G8 and it is not detecting the hard drives. We are using both non-hp, and official hp hard drives from an older server (DL120). Hard drives are 3.5" and they are not ...
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85 views

Unable to access disks in rhel 6.5

I work for a biology lab. We recently bought a new microscope that produces an enormous amount of data - it is simply not feasible to store it on a desktop. So, we bought a storage server - the idea ...
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626 views

running commands on physical drives on different backplane with megacli

So when I run "MegaCli64 -PDlist -aALL -NoLog | egrep 'Slot|state|Inquiry|Enclosure'" to grab a list of disks and their status. I can see a total of 36 disks. The issue is that they have the same slot ...
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206 views

Why was the replacement drive for failed drive in RAID 1 (linux software raid) was added as a spare?

I have a two drive linux software raid 1 for a server. There are two raid devices. (Boot (md0) & OS (md1)) Last week one of the drives failed so i ordered a new one. Today i shutdown the server, ...
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66 views

I forget to record the physical disk sequence for MegaRAID before transfer. Is there any way to recover.

I was so careless when I send my server for repairing. I removed disks from chassis to protect the data, but I did not record the position sequence for each disk and my raid card failed to build RAID5 ...
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177 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 ...
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47 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<br> ...
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56 views

DIR $file “File Not Found” vs DIR $filedir shows it…not permissions, not USB

I was having this problem before on a USB drive, but now it's happening on my main RAID5-backed hard disk: 2013-10-17 9:37 C:\>dir "C:\Shares\Shared\Reference\Safety Management System\Vid eo ...
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495 views

Expand Raid 10 set on MegaRAID LSI 9261-8i

I have an existing Raid 10 drive with 8 drives. 4 in each span. I can't figure out how to expand the set by adding two more drives, one to each span. I'm using the MegaCLI command line tool. I ...
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381 views

Ubuntu Preseed Raid 1 with multiple partitions

I intend to create the following RAID 1: Partition Size Filesystem / 20GB ext4 /boot 500MB ext4 swap 2GB swap /backup 10GB ...
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233 views

Resize a RAID 5 Partition

I'm moving my VG to a RAID, i have 3 disk 600GB, the VG is in the partition /dev/sdc2 /dev/sdc1 1G type linux <-- Boot partition /dev/sdc2 599G type Linux LVM One disk have the VG and with the ...
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362 views

GRUB is not loading - error: two disks with number 3

After rebooting my Debian 6.0 server I am getting these errors on load (captured it through kvm console): error: found two disks with number 3 error: superfluous RAID member (2 found) error: file not ...
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187 views

Resize virtual disk raid 0 MD1000 Perc 5/e

I've created virtual disk raid 0 of total size 2TB (one physical hdd), what if I will want to add next 2TB hdd into my storage dell powervault MD1000? Can I resize my existing virtual disk without ...
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168 views

Are there any Triple Parity RAID cards commercially avaliable?

I am looking to setup a triple parity raid system. I was searching for a hardware triple parity RAID card to use with a SAS expander from the usual suspects, but could not find any. Are there any ...