Dulce Systems

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Degraded RAID performance and rebuild time.

PRO RX, RXqp, RXd, FC, IDC, FCa:

RAID 5 summary: 9% performance impact with a drive down, 12% during rebuild. 20 hours rebuild time.

RAID 5

Default 5% rebuild priority

80% rebuild priority*

 

Performance affected

Rate

Time for 16TB

Performance
affected

Rate

Time for 16TB

1 drive down

9%

 

9%

 

Rebuild

12%

730GB per hour

20H 35M

63%

1780GB per hour

8H 23M

RAID 6 summary: 5 to 12% performance impact with drive(s) down, 9% to 16% during rebuild. 20 hours rebuild time.

RAID 6

Default 5% rebuild priority

80% rebuild priority*

 

Performance affected

Rate

Time for 16TB

Performance
affected

Rate

Time for 16TB

1 drive down

5%

 

5%

 

2 drives down

12%

12%

1 drive rebuild

9%

680GB per hour

20H 22M

70%

1640GB per hour

8H 28M

2 drives rebuild

16%

620GB per hour

22H 33M

71%

1570GB per hour

8H 53M

Measured with PRO RX with sixteen 1TB drives.

PRO DQ, DQg2:

RAID 5 summary: 10% performance impact with a drive down, 15% during Rebuild. 7 hours rebuild time.

RAID 5

Default 5% rebuild priority

80% rebuild priority*

 

Performance affected

Rate

Time for 4TB

Performance
affected

Rate

Time for 4TB

1 drive down

10%

not applicable

Rebuild

15%

480GB per hour

7H 18M

63%

1210GB per hour

2H 53M

RAID 6 summary: 12 to 18% performance impact with drive(s) down, 20% during rebuild. 7 to 8 hours rebuild time.

RAID 6

Default 5% rebuild priority

80% rebuild priority*

 

Performance affected

Rate

Time for 4TB

Performance
affected

Rate

Time for 4TB

1 drive down

12%

 

2 drives down

18%

1 drive rebuild

20%

400GB per hour

7H 25M

66%

1020GB per hour

2H 56M

2 drives rebuild

20%

370GB per hour

7H 58M

60%

830GB per hour

3H 37M

Measured with PRO DQ with eight 500GB drives.

Performance affected are Reads based on average of entire RAID from empty to full. Write performance not significantly affected. Rate is calculated based on useable capacity. Performance and Rate might vary with other capacity disk drives.

* Rebuild priority can be set via RAID Console > Systems Controls > System Config > Background Task Priority.

 

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