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
19
votes
6 answers
Should I 'run in' one disk of a new RAID 1 pair to decrease the chance of a similar failure time?
I'm setting up a RAID1 array of two new 4TB hard drives.
I heard somewhere previously, that making a RAID1 array of new identical hard drives bought at the same time, increased the chance that they would fail at a similar point in time.
I am…
a_henderson
- 291
- 1
- 6
19
votes
3 answers
How do I list which drives are part of each RAID array?
I have a linux software RAID using md. I want to list all of my RAID arrays and each hard drive attached to them. Is there an easy way to do that?
fatal_error
- 1,152
- 1
- 11
- 18
19
votes
7 answers
How many SMART sector reallocations indicate problems?
I have a NAS appliance that is just over a month old. It is configured to email me alerts generated from the hard drives' SMART data. After one day, one of the hard drives reported that a sector had gone bad and been reallocated. Over the first…
Jeremy
- 651
- 3
- 11
- 17
18
votes
3 answers
How to re-add a drive when RAID is in degraded mode?
I am running an unmanaged Ubuntu server and due to recent performance issue and sent a request to the provider only to receive the following response:
"Dear Client,
as requested we have checked your drives. Both drives pass a test without any…
captain lizard
- 371
- 1
- 3
- 11
18
votes
3 answers
Suddenly slow RAID performance
We recently noticed our database queries have been taking much longer than usual to run. After some investigation, it looks like we're getting very slow disk reads.
We've run into a similar problem in the past caused by the RAID controller…
danpelota
- 361
- 1
- 3
- 11
18
votes
6 answers
Why is RAID 1+6 not a more common layout?
Why are the nested RAID levels 1+5 or 1+6 almost unheard of? The nested RAID levels Wikipedia article is currently missing their sections. I don't understand why they are not more common than RAID 1+0, especially when compared to RAID 1+0 triple…
James Haigh
- 358
- 1
- 2
- 10
18
votes
12 answers
Should a backup server use RAID?
I was asked to set up a new backup server using Symantec Backup Exec that stores to hard disk instead of tape, because the backup size is outgrowing tape capacity.
I was wondering does it really make sense or are there any advantages for the backup…
easyappl
- 303
- 2
- 3
- 6
18
votes
4 answers
Megacli is killing me, any help appreciated
I run a server with 2 drives in raid0 configured through BIOS. I just added 2 more drives using hotplug (the server is dell r610 with RHEL 5.4 64bit) and I would like to configure a separate raid0 partition on these drives. I am getting the…
Stefan
- 181
- 1
- 1
- 3
17
votes
2 answers
Is GPT needed on a 16 TB data disk?
I have made /dev/sdb which is a 16 TB disk using hardware RAID, where I am temped to put XFS directly on /dev/sdb without making partitions. In the future will I need to expand this to double the size.
The hardware is an HP ProLiant DL380 Gen 9 with…
Jasmine Lognnes
- 2,520
- 8
- 33
- 51
17
votes
4 answers
Hardware RAID Controller Support for SSD TRIM
Do any hardware RAID controllers available today support TRIM?
If not, do any manufacturers have target dates for supporting TRIM?
Should I even care about TRIM for SSDs installed in performance-sensitive workstations?
Before you suggest it, yes…
dss539
- 272
- 1
- 3
- 10
17
votes
7 answers
Disabling RAID feature on HP Smart Array P400
I'm planning to use ZFS on my system (HP ML370 G5, Smart Array P400, 8 SAS disk). I want ZFS to manage all disks individually, so it can utilize better scheduling (i.e. I want to use software RAID feature in ZFS).
The problem is, I can't find a way…
Arie K
- 1,633
- 5
- 19
- 27
17
votes
4 answers
explain md's raid10,f2
I know how most of the various RAID's work. But I stumbled on the recommended raid10,f2
mode while researching linux software raid. I don't really understand how it works on 2 or 3 disks. could someone explain it to me? or point me to a really good…
xenoterracide
- 1,496
- 2
- 13
- 26
16
votes
4 answers
Low-end hardware RAID vs Software RAID
I want to build a low-end 6TB RAID 1 archive, on an old pc.
MB: Intel d2500hn 64bit
CPU: Intel Atom D2500
RAM: 4GB DDR3 533 MHz
PSU: Chinese 500W
NO GPU
1x Ethernet 1Gbps
2x SATA2 ports
1x PCI port
4x USB 2.0
I want to build a RAID1 archive on…
Igor Z.
- 289
- 2
- 7
16
votes
4 answers
Storage Space vs Disk Management Mirroring
Windows 2012 R2:
I am deciding on a RAID 1 (Mirroring in Windows terminology) implementation. I understand I have two options included in Windows:
Storage Space Mirroring
Disk Management Mirroring
How does Storage Space compare Mirroring to Disk…
Allan Xu
- 685
- 2
- 6
- 12
16
votes
5 answers
How to check if hardware RAID is configured?
I have several servers running Windows 2008 and Red Hat 5 that are capable of hardware RAID. How do I check that hardware RAID is configured?
lillq
- 317
- 1
- 3
- 8