Unsolved
This post is more than 5 years old
1 Rookie
•
6 Posts
0
9696
October 29th, 2018 23:00
Storage Usable Capacity
Hi,
How to calculate usable capacity for 1.92TB x 7 SSD (single redundancy - tier 1) and 6TB x 11 HDD (dual redundancy - tier 2/3)
Thank you
No Events found!
DELL-Sam L
Moderator
•
7.6K Posts
1
October 30th, 2018 09:00
Hello SC Newbie,
Here is a link to a guide for Understanding RAID with Dell SC Series Storage. http://en.community.dell.com/techcenter/extras/m/white_papers/20442059
Please let us know if you have any other questions.
SC Newbie
1 Rookie
•
6 Posts
0
October 30th, 2018 16:00
Hi Sam,
Thank you for the response.
I have read the document but still have no answer. Can you explain me how to calculate usable capacity ? Because single redundancy contains 2 kinds of raid (10 and 5) and dual redundancy contains 2 kinds of raid (10DM and 6).
Thank you
DELL-Sam L
Moderator
•
7.6K Posts
1
October 31st, 2018 08:00
Hello SC Newbie,
Here is a breakdown of how the Raid is used.
Type
Raid Type
Description
Required Disks
Data Disks
Overhead %
Efficiency %
Redundant
R10-2
Mirror
2
1
100%
50%
Redundant
R5-5
Parity
5
4
25%
80%
Redundant
R5-9
Parity
9
8
12.50%
88.75%
Dual Redundant
R10-DM
Dual Mirror
3
1
200%
33.33%
Dual Redundant
R6-6
Dual Parity
6
4
50%
66.66%
Dual Redundant
R6-10
Dual Parity
10
8
25%
80%
Please let us know if you have any other questions.