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36 votes
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Why is RAID 0 classed as RAID when it's not redundant?

You actually part answered this in your question. The lowest form of RAID is RAID 1. RAID 0 was added well after RAID was defined (can't find reference to a date for this though) The 0 in RAID 0 is ...
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24 votes
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mdadm - Remove disk from RAID0

First of all: to those, who still believes in "RAID0 has no hot spare". It could have a manual spare, done by human, who understand RAID levels and mdadm. mdadm is software RAID, so it could ...
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  • 710
12 votes

Why is RAID 0 classed as RAID when it's not redundant?

RAID is just a name with a meaning that changed over time. The important part is that the underlying technology and mechanisms are the same for the RAID levels, so you use the same controller (or ...
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  • 97k
9 votes

Rotate entire disk set in RAID0 array?

On modern hardware RAID controllers, RAID metadata is written to the disks, so they are somewhat portable, with restrictions on drive ordering; they have to be moved together. However, this is the ...
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9 votes
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Few questions about creating RAID0 with LVM

Modern Linux kernel have two different drivers to manage multiple devices: devicemapper and the classical MD software RAID (the one used by mdadm). The two LVM commands above both create a striped ...
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6 votes

Why is RAID 0 classed as RAID when it's not redundant?

As others have suggested, RAID 0 could be taken as level 0 meaning zero redundancy. It is referred to as RAID even though there is no redundancy for two other reasons: It is usually defined and ...
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6 votes

HP Microserver Gen8 RAID0 rebuild loss data

So lets see if I got this straight: You had two Western Digital HDDs in a RAID 0 array. You removed them and replaced them with some Seagate HDDs, and created a new RAID 0 array. You then replaced ...
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5 votes

mdadm: add new device failed for /dev/xvdl as 2: Invalid argument

yes you can, to add one disk to raid 0 mdadm --grow /dev/md0 --level=0 --raid-devices=3 --add /dev/sdd or you can add several disks mdadm --grow /dev/md0 --level=0 --raid-devices=4 --add /dev/sdd /dev/...
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5 votes

BTRFS single data FS still striped?

I know this is a bit old question, though I have found it during my research on the same track. There's a pretty thorough explanation from Hugo Mills on the btrfs-kernel mailing list (https://www.mail-...
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5 votes

Lsi MegaRaid sas 9271-8i raid-0 crash

You wipe and rebuild - you chose R0, by doing so you made the conscious decision that your data doesn't matter, at all, as you must have a ready-to-go mitigation right to hand. Well do that.
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4 votes
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Drive allocation in a RAID 50 array on a HPE DL380 G9

The number of RAID5 sets for RAID0 should be able to configure in raid utility. In your case you can select 2 (6 disks in RAID5), 3 (4 disks in RAID5) or 4(3 disks in RAID5). From perfromance and ...
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3 votes
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Trouble Installing Windows Server 2008 R2 on a Dell PowerEdge R220

I couldn't find a way to make the server itself tell the Windows installer how to see the disk, but by talking to @joeqwerty in the comments I ended up following this course, which worked: Download ...
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  • 205
3 votes
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Recover data from 1 disk after broken raid 5

What can I do to attempt to recover the files? Stop what you are doing. Power off the server. Remove the hard drives and ship them off to a professional data recovery shop. Period, full stop. You ...
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3 votes
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mdadm: add new device failed for /dev/xvdl as 2: Invalid argument

According to the kernel.org RAID wiki: After the new disk was partitioned, the RAID level 1/4/5/6 array can be grown that is, RAID-0 is not eligible for growing. You will need to backup all the ...
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  • 78.3k
3 votes

HP G8 migrate RAID0 to RAID1 with CLI commands

The problem is that with the first command you create a new logical drive - when finished you will have two LDs, each containing one disk. What you need to do instead is add the unassigned disk to ...
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3 votes
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What is the risk of RAID 0 for a *single* disk versus no RAID on that disk?

The main issue is that you will need a similar, or even identical, RAID card do read the disk in another server. In other words: if your current server/motherboard/RAID card fails, you will need to ...
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2 votes

What is a single drive RAID 0 array?

RAID-0 on single disk is used mostly on SSD disks, which acts as Cache disk (Intel Smart Response). When you activate "accelerate mode" for any HDD or RAID Volume via SSD Cache, IRST driver converts ...
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2 votes
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DELL FS12-SC PERC 6/i replacement with JBOD support?

It looks like that is a custom build server. I presume the perc 6/i is on the motherboard. Assuming you have an appropriate pci-e slot available, I would just add a SATA controller HBA (one which can ...
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2 votes

HP G8 migrate RAID0 to RAID1 with CLI commands

Based on the further info and the fact that the raid controller doesn't have a battery installed I suggest you take a completely different path. The controller you have - B120i - is not a full ...
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  • 23.7k
2 votes

PERC H310 Raid 5 - Fault - Turn array into RAID 0

So you have a redundant array of disks that started to die. And you want to migrate it to the raid level where the death of a single disk will be fatal for data. My opinion - it's some sort of ...
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  • 8,034
2 votes

Why is RAID 0 classed as RAID when it's not redundant?

Normaly you talk about a RAID Level. So i you say a System is RAID-0 it does not mean it is 'redundant with type 0', it does only mean it is of 'RAID Level 0', witch means no raid at all.
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2 votes
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Linux- Convert 2 disk raid1 to raid0

mdadm(8) sez: The GROW mode is used for changing the size or shape of an active array. [...] Currently the supported changes include [...] convert between RAID1 and RAID5, between ...
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2 votes
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Slow read speed. Raid 10 + H700 (1GB RAM + battery) + 4x 450 Hitachi 15K

In terms of sequential performance, for both read and write, RAID10 of four drives behaves exactly as RAID0 of two drives. You are seeing that yourself with just two drives blinking. That is the ...
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  • 3,887
2 votes

Why is RAID 0 classed as RAID when it's not redundant?

Because "not redundant" is a valid point on the scale of how redundant something is.
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2 votes

Windows 10 Installation Failure New Server

A. Servers do not come preloaded with Win10 OEM, this is a workstation. B. This forum is intended for IT systems in a business environment. Sounds like this doesn't fit the bill. C. Your list of ...
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2 votes

ZFS on top of a bunch of Raid0 (1 disk) volumes with battery backed write-cache

It can be done of course, but getting some recent and decent HBA instead is a waaaaay more bulletproof route.
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2 votes

2 disk raid0, move all data to one disk, so the other can be removed

You cannot do this. RAID0 works by writing stripes alternating between drives. So, first x MB of your virtual drive is on drive 0, next x MB on drive 1 etc. You need to set up the drives from scratch.
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2 votes

2 disk raid0, move all data to one disk, so the other can be removed

a) Backup your data b) Break the RAID leaving two individual disks left c) Format single disk with a local file system d) Get your data back from the backup done with (a) e) Unmount your unneeded disk
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1 vote
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Windows Striped Vs Single Hard Drive

I wouldn't say you're going to have an issue. Read/Write speeds can vary on a lot of things when it comes to individual desktop setups. Setting up a RAID-0 is usually only a good idea if you know ...
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  • 26
1 vote

SSD + HDD RAID 0 Performance?

Is it possible? Of course, but with a RAID0, you will only use the same size on the HDD as is the SSD, which will usually be smaller. Will it provide good performance? Obviously not, except in edge ...
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