Windows 10: RAID 0 on linux kernels >5.3.3 (Hosts and VM's)

Hi folks

for those using RAID 0 especially on devices with unequal sizes you won't be able to access your array after kernel 5.3.3 (whether as host or in a VM)

This applies whatever the Windows Host virtualisation you are using - whether VBOX / VMWare or HYPER-V. Also applies to Linux Hosts (and any VM's running on a Linux host too).

you need to ensure you change the default : (This applies to all RAID 0 whether on boot device or not).

Caution: Kernel 5.3.4 and RAID0 default_layout – Webentwicklung

note also those who suggest switching to LVM -- it's a get around but if its speed you are after RAID 0 still is far faster.

Cheers
jimbo

:)

 

RAID 5 Windows 10 Host OS Running CentOS-Linux in VirtualBox

This is my first time using a Virtual Machine so please forgive my ignorance.

My computer is running Windows 10 and then in VirtualBox I'm running CentOS. I have 3 new 1TB HDDs. I want to run the 3 drives in a RAID 5 configuration and then use the RAID 5 in CentOS. If I setup a RAID 5 in Windows 10 (the host OS) will CentOS recognize the RAID 5?

Or do I need to setup the RAID 5 in my VM? If I'm running RAID 5 in my VM can I also access those drives directly through my host OS (Windows 10)?

 

RAID-3 on the cheap -- is it possible?

No I do not know of a drive that would cheaply do compression. I am sure the major drive makers could provide something.

Please join TechNet.

RAID 3 is more complex than you seem to think. And in the old days, before RAID 5 was readily possible, it was the go to solution where Reading was more important than Writing.

RAID 0, 1, 5, 6, and 10 are the ones really used today. Raid 3 is not a reliable, cheap, or good practical method to provide data integrity.

https://datapacket.com/blog/advantages-disadvan...

More on the problem with RAID 3.

https://blog.open-e.com/raid-2-raid-3-raid-4-wh...

http://www.data-recovery-app.com/datarecovery/r...

https://www.slideshare.net/ShitalShinde2/raid-l...

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Frankly, in your situation I would use individual drives and have a good backup plan or spring for RAID 5 (and still have a good backup plan).

Rob

 

RAID-3 on the cheap -- is it possible?

----- What is RAID-3 on the cheap? -----

RAID-3 on the cheap is a 2-drive RAID-0, plus a smaller, 3rd drive. The 2-drive RAID-0 is standard, not anything special. The 3rd drive is a dedicated parity drive. It's the 3rd drive that makes it a RAID-3. But it's not an ordinary RAID-3.

How is it different from ordinary RAID 3? The RAID-0 & the 3rd drive are written only once. The 3rd drive is then unplugged & put away (to be taken out solely to rebuild the RAID-0, if needed -- hopefully never).

Compression is applied to the 3rd drive to halve its size. For example, if the RAID-0 is 2 x 8 TB, the 3rd drive will be 4 TB.

In theory, if the RAID-0 data is truly random & block size is very large, the 3rd drive can be nearly half its usual size. In practice, 1- to 2-percent of the RAID-0 data will be structured, and block size will be the entire RAID-0, therefore, the (compressed)
3rd drive is almost guaranteed to be less than half its usual, uncompressed size.

----- Is there an existing software product? -----

Data Write: The user creates a RAID-0 as usual, no special handling, no special software.

Parity Write: The software reads the RAID-0 & writes a compressed parity stream to the 3rd drive.

Rebuild: The software reads the 3rd drive & uses the decompressed parity stream to rebuild the RAID-0.

Advantage of RAID-3 on the cheap: The 3rd (parity) drive is only half its usual size.

Disadvantage of RAID-3 on the cheap: The RAID-0 must reasonably be treated as read-only (or write-rarely).

The application is home theater. Thus, once it's written, the 3rd drive can be unplugged & put away.

Can Win10 Storage Spaces accomodate the compression needed to realize RAID-3 on the cheap? Or will RAID-3 on the cheap require special software?

Thanks, and Warm Regards,

Mark.