RAID 10 is a combination of RAID 1 and RAID 0. RAID 10 can also be referred as RAID 1+0

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LSI Cachecade Pro 2.0 with RAID10 SSD Cache?

I'm trying to add a RAID10 SSD Cache to a VD by this command: [root@livecd storcli]# ./storcli64 /c0 add vd cachecade type=r10 drives=252:4,252:5,252:6,252:7 assignvds=0 Controller = 0 Status = ...
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315 views

How to recreate a RAID 10 array with mdadm

So our virtual machine has broken (it's actually a Linux machine in Azure) on which we were running a RAID10 array of 4 disks. It's an ubuntu box. From what I can tell the four data disks are fine, ...
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1k views

How to create Raid 10 with megacli

I have OpenFiler storage server. Without installing Windows and MSM, I want to create raid10 array from disks 2 to 21. I have already successfully installed MegaCli to OpenFiler but I'm stuck in ...
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51 views

6 times slower disk write in RAID10 on Ubuntu 14.04 after rebuild

OS: Ubuntu 14.04 LTS Software Raid 10: 4x120Gb Intel 530 SSDs Initial tests: 1.2 GB/s Write 5.2 GB/s Read I did some tests to check if everything will go alright with a failed disk: I set as ...
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194 views

FreeBSD 9 (amd64) reboot/shutdown process is very slow

I have a Dell Poweredge 2900 III with FreeBSD 9 (amd64), the server uses mfi wich handles a raid10, I had to reboot the server, but notice that either when rebooting or shutting down the server, ...
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54 views

Shared storage solution for our sql server backups

We have 3 clustered sql servers. We have 5+ multi terrabyte databases and their backup files (compressed using quest litespeed) are hitting over 600gb each, We are required to keep at least a week or ...
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168 views

Expand VD in Raid PERC H710, Dell R720 mini

I have purchased Dell R720 server with PERC H710 Raid Controller. Initially I have configured RAID-10 with 6 SAS 300GB Drives. Installed Win2008 R2. Raid10: After deployment I come to add 2 more ...
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190 views

How do I check if server really has RAID 10 enabled?

I have a dedicated server with 4 hdd and RAID 10, with Cent OS 6.4 How can I check if RAID is really enabled. I'm in doubt because on another server with RAID 10 enabled, I can see in /dev sg0 sg1 ...
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280 views

Capacity Expansion on PERCH700 RAID-10

I have Dell Poweredge R710 server with PERC H700 Integrated RAID controller. Currently there are 4 SAS 300GB disks in RAID-10 array exposing single volume of 600GB. Server is running VMware ESXi 5.1. ...
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261 views

How to re-add a RAID-10 failed drive on Ubuntu?

I have a problem that I can't seem to solve. We have a Ubuntu server setup with RAID-10 and two of the drives dropped out of the array. When I try to re-add them using the following command: mdadm ...
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65 views

Fast backup and restore on RAID10

to test a software update on a server with 4 hd in RAID10, I'm going to remove two of the 4 hd to use them again to restore the system to its previous state. The controller is a Smart Array 6400 with ...
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Why don't enterprise RAID controllers support migration from RAID 5 to RAID 10?

I've been doing some research on the possibility of live migration from RAID 5 to RAID 10 and I'm curious as to why it seems that most RAID controllers (particularly Dell's PERC controllers) don't ...
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423 views

Very poor disk performance on KVM node - mdadm raid10

For a long period of time, i'm experiencing performance issues on CentOS servers that are used for KVM virtualization. I'm running software RAID-10 with 4 disks (Seagate ST2000DM001, 2TB, 7200rpm ...
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923 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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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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184 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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Preseed RAID10 does not seem to work

I have this config (excerpt) for my preseed d-i partman-auto/method string raid d-i partman-auto/disk string /dev/sda /dev/sdb /dev/sdc /dev/sdd d-i partman-auto/expert_recipe string \ ...
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What RAID policies should be used for a XenServer host?

I have a server with a PERC6/i card and a RAID-10 array running XenServer 6.1 with 6x VMs, one of which is SBS 2008 and the rest are a mix of file server, video-on-demand and SQL database server. The ...
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Is it possible to modify the raid volumes once the OS is installed? RAID10 Windows Server 2008

My problem is the following: I've rented a dedicated server with RAID10, but they have set only one volume in raid -> Disk0. The Disk0 has 12 Tbs but with MBR i can only use the OS partition 100Gb ...
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four-disk md raid10-far can be assembled and ran as “clean, degraded” with only 2 disks. Bug or i'm missing something?

Today i was solving raid failure on raid10-far with four disks. One disk failed and another wasn't re-added after a hard reboot. The mdadm -D was reporting it's clean and running with only two out of ...
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General software RAID operation question

I'm using dmraid on Ubuntu Maverick, and I am trying out some tests using RAID10 - I would like to confirm if I should be seeing the following: When I cause one RAID member disk to fail (so I've got ...
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Corrupted parity in the Raid header

Has anyone here experienced a problem with 'corrupted parity in the Raid header'? We regularly find that a Consistency Check on our Raid 1+0 array detects inconsistencies. It has been suggested by ...
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205 views

LSI MegaRAID LINUX got Optimal after degradation but strange POST message

Linux server box with LSI MegaRAID controller got degraded. But after some time RAID status changed to Optimal. Adapter 0 -- Virtual Drive Information: Virtual Drive: 0 (Target Id: 0) Name ...
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How many Spans for RAID 10 with 4x500GB SAS Physical Disks for Virtualization Server Data part

I'm setting up a PowerEdge R420 as a Hyper-V server. Windows Server 2012 will be on RAID 1 (2x 160GB SSDs) and Data part I would like to put securely on 4x 500GB SAS HDDs. The question is what would ...
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Mdadm RAID10 far layout 2, fault tolerence and extendability

I plan to build an mdadm raid10 f2 using 2x1Tb and 2*3Tb hard disks. I have read the wikipedia page but I am not sure I understood everything properly. For what I have read I can loose at the same ...
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Changing default cache policy online on LSI Megaraid

I am having a RAID 10 with 6 Harddiscs in my server. I had set the default cache policy to write through. After setting up the OS, i came to know the I/O rates are too slow. I read in some forums that ...