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]
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Areca 1280ml RAID6 volume set failed
Today we hit some kind of worst case scenario and are open to any kind of good ideas.
Here is our problem:
We are using several dedicated storage servers to host our virtual machines. Before I continue, here are the specs:
Dedicated Server…
Richard
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What does 3Ware's tw_cli mean by a "DEGRADED" disk vs "ECC-ERROR"?
I've got a sad RAID array on a 3ware 9650SE-16ML card. What I can't tell is if I've just suffered a double-disk failure (bummer!) or if I'm reading this wrong. The relavent output of /c0 show all is:
Port Status Unit Size …
Bill Weiss
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mdadm and 4k sectors (advanced format)
There are numerous questions on Serverfault about aligning 4k sectors disks, but one thing is not really clear to me yet.
I successfully aligned my RAID1+LVM. One of the things I did was use mdadm superblock version 1.0 (which stores the superblock…
Halfgaar
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mkfs Operation Takes Very Long on Linux Software Raid 5
I've set-up a Linux software raid level 5 consisting of 4 * 2 TB disks. The disk array was created with a 64k stripe size and no other configuration parameters.
After the initial rebuild I tried to create a filesystem and this step takes very long…
Elmar Weber
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How can I force HP Smart Array RAID controller to re-recognize drives?
I have an HP ProLiant DL180 G5 server with a Smart Array E200 RAID controller. The RAID controller is refusing to recognize inserted drives as an array. The story so far...
This server (our file server) needed an upgrade. It started with 8 x 250GB…
Nic
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What purpose does the battery serve on a battery-backed caching RAID controller if the server is on an uninterruptible power supply?
Is the battery redundant if the server is on a properly-sized UPS? There is an option to force write-back mode and I want to understand the risk. It is my understanding that it helps against power failures while data in the cache has not been…
RPC
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RAID level and filesystem for a large storage server
This has been asked a million times but every time the answer is subject to "it depends on your requirements" condition, so I cannot extract a general guideline to apply to my case. So I ask again.
I have a 24 bays disk server (dual Xeon Silver…
Nicola Mori
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One large RAID 10 vs several smaller arrays?
My question is: when is it appropriate to simply create one large array with fast read & write performance, such as RAID 10, instead of creating smaller arrays for specific applications?
It seems to me that if my overall I/O requirements are not…
Boden
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Investigating beyond RAID for disk cluster in a server, is Dynamic Disk Pool comparable?
With the development of hyperconverged systems, we can see other technology than RAID to handle distributed storage (like ceph for example or VSAN or distributed storage like in nutanix).
But is there open source Technology derivate from object…
dominix
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HP Smart Array P410: Convert RAID10 to RAID1 OR remove disks from RAID10
I have a server with two RAID10 arrays of 146GB disks. I'm trying to replace one RAID10 array of 146GB disks with RAID1 of two 2TB disks.
Since there are no free ports, I took out two disks from the array which I am going to replace. Now the status…
DiNGeR
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Is Ceph possible to handle hardware RAID arrays (LUNs) as OSD drives?
I am pretty new to Ceph and try to find out if Ceph supports hardware level raid HBAs.
Sadly could not find any information. What I found is, that it is recommended to use plain disks for OSD. But this pushes the requirements to the PCIe, the…
cilap
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HP Proliant DL380 Gen9 Got Wet during Hurricane Irma, Hard Drive still good, can I just plug to a new identical server
HP Proliant DL380 Gen9 got wet during Hurricane Irma, 2 hard drive configured as RAID 1 (Mirrored) are still good. Already ordered replacement, identical specs with the old one, Can I just simply plug in the 2 hard drive to the identical server and…
Leo Lumacang
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write hole: which RAID levels are affected?
In my journey to understanding the advantages of RAIDZ, i came across the concept of write hole.
As this page explains, a write hole is the inconsistency you get among the disks of the array, when the power is lost during a write. That page also…
Mario Vitale
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RAID strategy - 8 1TB drives
I'm setting up a backup storage device-
This machine has Windows Server 2008, on a separate boot drive.
It has 8x 1TB drives, and uses a hardware RAID card.
My question is, which RAID configuration should I go for?
Initially, I was going to go with…
alex
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How can RAID deal with inconsistent data?
RAID 1 and RAID 5 (and their brothers 10 and 50) achieve data redundancy respectively through mirroring and through parity checking. This allows a RAID array to still access data when a sector on a disk (or a whole disk) becomes unreadable. RAID 6…
Massimo
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