RAID, an acronym originally for Redundant Array of Inexpensive Disks (today usually interpreted as referred to as Redundant Array of Independent Disks), is a technology that provides increased storage performance and reliability through redundancy by spreading data across multiple disks using various algorithms (RAID-levels). RAID can be implemented in hardware storage controllers, or in software, usually as operating system/kernel features.
Questions tagged [raid]
3655 questions
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What counts as a 'large' raid 5 array?
A recent issue with a Buffalo TeraStation NAS here in my office has got me investigating Raid 5.
I've found a few different articles talking about the unsuitability of using raid 5 in large arrays, or with large disks
Here is one example article…
Rob
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Are consumer class hard disks okay for zfs?
I just recently bought a new server an HP DL380 G6. I replaced the stock smart array p410 controller with an LSI 9211-8i.
My plan is use ZFS as the underlying storage for XEN which will run on the same baremetal.
I have been told that you can use…
AtomicPorkchop
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How to utilize spare workstation drive space for server storage/backup
So, given the fact that you can only get hard drives of about 160GB now for the cheapest price, I find i have a ton of extra drive space on workstations spread throughout my office. I'd like to utilize this space as a redundant RAID-like array of…
Erik Funkenbusch
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Hot spare or extra parity drive in RAID array?
In a different question about configuring a RAID array, the author is building a RAID array with 8 drives.
One answer suggests using 7 drives in RAID 5 with one left over as a hot spare. Since RAID 6 protects against two failures, even if they are…
Nic
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Do disks in Raid-1 function outside of the raid?
Raid-1 is mirroring two disks (if I haven't messed up completely here :p). Does that mean that I could take one disk out and put it into another machine and it would work like a normal disk? Or does it still only work in the raid? I can understand…
Svish
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iDRAC Enterprise vs iDRAC Express on Dell Server
I have a Dell PowerEdge server with iDRAC6 Express and a PERC 6/iR (LSI 1068e) SAS RAID Controller.
I'm a bit confused about what this means.
Is it possible to login remotely to change bios/RAID configuration?
If this is not possible what can the…
monkeyking
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SQL Server setup check list
What are the things I have to consider when I have to install SQL Server (2005/2008) on a new server?
Storage setup
TempDB
Security
What are some common mistakes made in that process?
splattne
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RAID 5/6 rebuild time calculation
I plan to build some storage schema but I have to anticipate downtime, maintenance and rebuild Time.
Some guys said to me that a 10 disk RAID6 of 10To (SATA) rebuild will last for about a week ! and some company policy ask for stopping activity on…
dominix
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After hardware RAID array expansion fdisk wont allow me to use additional available sectors
We have a large ~18TB hardware raid array on a Dell R720xd. Currently the RAID5 array consists of 6x4TB and I needed to extend it.
Step 1 expand the hardware raid array.
Simple enough if you have the dell admin tools installed.
omconfig storage…
Vagnerr
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xfs on lvm on hardware RAID: correct parameters?
I have 10 disks with 8 TB each in a hardware RAID6 (thus, 8 data disks + 2 parity). Following the answer of a very similar question, I hoped for an automatic detection of all necessary parameters. However, when creating the XFS file system at the…
sebschub
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Windows Server Backup Error - Volumes Larger than 16.7TB cannot be protected?
I'm trying to use Windows Server Backup to backup a RAID array on my new server. But, when I do, I run into this error:
The server is running Windows Server 2012 R2 and the array in question is 20TB in size (with 18TB usable); less than 1TB is…
Chris Powell
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Why is my RAID1 read access slower than write access?
I have done some simple performance tests and it seems that reading from my RAID1 is slower than writing:
root@dss0:~# for i in 1 2 3; do dd if=/dev/zero of=/dev/sda bs=1048576 count=131072; done
137438953472 bytes (137 GB) copied, 192.349 s, 715…
nn4l
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Which block sizes for millions of small files
I have 2x 4TB Disks in hardware RAID1 (it might be a LSI MegaRaid) on Debian Wheezy. The physical block size is 4kB. I'm going to store 150-200 million of small files (between 3 and 10kB). I'm not asking for performance, but for best filesystem and…
rabudde
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Removing raid metadata from drives
Normally when I have a drive which contains raid metadata e.g. from fakeraid or a hardware raid card I can get rid of it with:
dmraid -r -E /dev/sdX
Or if that doesnt work, doing a simple dd if=/dev/zero of=/dev/sdX normally works
But I have four…
Tiffany Walker
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Disk/RAID Monitoring for HP Proliant Servers and Ubuntu 12.04
How can I monitor the status of the hard disks and the RAIDs of an HP Proliant server using Ubuntu 12.04. In Ubuntu 10.04 I could use the cciss-vol-status to query the RAID status periodically but cciss-vol0-status doesn't work on 12.04 anymore. In…
Drew
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