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Help deciding between RAID 5 and RAID 1+0

(@andresena)
Eminent Member Customer

Hello, forgive me if this has been answered, I looked around but didn't see anything.

I'm building a new primary storage (priority fast and safe - personal use)
Volume 1 - RAID 5 for video, photography and audio.
Volume 2 - I'm struggling between RAID 5 or RAID 1+0.

Reading the information on "Choosing the best RAID level" web page:
"We also suggest RAID 1+0 if you have 4 or more disks, and need to write many small files to your disk"
and
"RAID 4 and RAID 5 are great if you need to frequently access (read) a lot of fairly small files. However they are much slower at writing many small files to disk, since they have to create 'parity data' for each file. If you need to write many small files, we suggest you use RAID 1+0"

The second volume will be used to store all my documents (text, spreadsheet, presentation, PDF), training videos, music and some code writing (between 200 and 600 bytes each file).

For this scenario RAID 5 or RAID 1+0 for fast operation?
I'm inclined to use RAID 5 to get more capacity and, from what I understand, more read speed than RAID 1+0. Generally, when I'm working with documents, don't get more them 5 open files, few write operations. Backup operation for this volume to a standalone hard drive is practically read operation, so, no problem, I think. Since I constantly sync the data to a standalone hard drive, I'm assuming that I don't need the increased data safety from RAID 1+0.

Will be any performance issues using RAID 5 for this general use in day by day work?

Is correct to assume the first time I'm restoring my files from backup to Volume 2 (RAID 5) will take a longer period to finished because of the much lower writing speed from the many small files. That's it.

Now, for the rebuilt part, when needed:

Scenario A : volume 1 and 2 RAID 5
Scenario B : volume 1 RAID 5 - volume 2 RAID 1+0

In case of a disk failure, is there something to note for the rebuilt part?

Thanks in advance for helping me out!

Quote
Topic starter Posted : 06/10/2018 9:46 am
(@softraid-support)
Member Admin

Generally you can work with:
RAID 4/5 is faster and great overall performance
RAID 1+0 is "safer", as there are two parity disks and recovery is easier in the event of an emergency.

RAID 1+0 is slower, because it acts essentially as a Mirror volume.
It may be faster with smaller files, but with a mix of files, RAID 5 will be faster.

From your description, just use RAID 5.

Have a good backup strategy!

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Posted : 06/10/2018 6:11 pm
(@andresena)
Eminent Member Customer

Thank you for the quick and helpful response!

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Topic starter Posted : 07/10/2018 5:01 am
(@terrymulhern)
New Member Customer

For this scenario RAID 5 or RAID 1+0 for fast operation?
I'm inclined to use RAID 5 to get more capacity and, from what I understand, more read speed than RAID 1+0. Generally, when I'm working with documents, don't get more them 5 open files, few write operations. Backup operation for this volume to standalone hard drive is practically read operation, so, no problem, I think. Since I constantly sync the data to a standalone hard drive, I'm assuming that I don't need the increased data safety from RAID 1+0.

Hello,

I thought RAID 5 should be faster with a mix of files, just like you mentioned, but seems to me there's no big difference. Should I switch over to RAID 1+0? Seems to be working better.

Terry

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Posted : 18/02/2019 4:31 am
(@softraid-support)
Member Admin

If it works as well for you, RAID 1+0 is more solid, especially when a disk is starting to fail.

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Posted : 18/02/2019 10:20 am
(@softraid-support)
Member Admin

Note: RAID 5 is always faster than RAID 1+0 for the same number of disks.

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Posted : 19/02/2019 10:00 am
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