What is RAID-DP netapp?
RAID-DP is the default RAID type for all aggregates. RAID-DP provides double-parity disk protection when the following conditions occur: There is a double-disk failure within a RAID group. There is a single-disk failure or a media error on the disk, or both instances within a RAID group.
How many parity disks are there in a RAID-DP aggregate?
two parity disks
The default RAID type, RAID-DP (RAID-double parity), requires two parity disks per RAID group and protects against data loss in the event of two disks failing at the same time.
How many hot spares should I have?
For all other Data ONTAP disk types, you should have at least one matching or appropriate hot spare available for each kind of disk installed in your storage system. However, having two available hot spares for all disks provides the best protection against disk failure.
What is the difference between RAID-DP and RAID-TEC?
RAID Types – RAID-TEC The TEC stands for Triple Erasure Encoding. So RAID 4 was one parity drive, RAID-DP is two parity drives, and RAID-TEC is three parity drives. RAID-TEC is the default RAID type if the disk size is 6 TB or larger, and it must be used if the disk size is 10 TB or larger.
How does RAID-DP work NetApp?
RAID-DP buffers data blocks on memory to accomplish multiple horizontal and diagonal parity calculations on a single read operation. The 2% performance overhead of RAID-DP versus RAID 4 results from the additional overhead of calculating diagonal parity and writing the second parity block.
What is a RAID-DP?
RAID-DP provides double-parity disk protection when the following conditions occur: There is a single-disk failure or double-disk failure within a RAID group. There are media errors on a block when Data ONTAP is attempting to reconstruct a failed disk.
Why does netapp use RAID 4?
RAID4 provides single-parity disk protection against single-disk failure within a RAID group. If an aggregate is configured for RAID4 protection, Data ONTAP reconstructs the data from a single failed disk within a RAID group and transfers that reconstructed data to a spare disk.
What is RAID group in netapp?
A RAID group consists of one or more data disks or array LUNs, across which client data is striped and stored, and up to two parity disks, depending on the RAID level of the aggregate that contains the RAID group. RAID-DP uses two parity disks to ensure data recoverability even if two disks within the RAID group fail.
Does RAID 10 need hot spare?
A RAID 10 configuration requires two disks per RAID 1, and can have only one hot spare disk. A RAID 50 configuration requires three disks per RAID 5, and can have up to two hot spare disks.
What is RAID 6 used for?
RAID 6, also known as double-parity RAID (redundant array of independent disks), is one of several RAID schemes that work by placing data on multiple disks and allowing input/output (I/O) operations to overlap in a balanced way, improving performance.
What is RAID TEC in netapp?
Beginning with ONTAP 9.0, a new RAID policy called RAID-TEC is available. RAID-TEC helps to mitigate this risk by providing triple-parity protection so that your data can survive up to three simultaneous disk failures. RAID-TEC is the default RAID policy for capacity HDD aggregates with disks that are 6 TB or larger.
What is difference between RAID 6 and RAID-DP?
The advantage of RAID-DP compared to regular RAID6 is that growing your RAID set is just a matter of adding drives, whereas with RAID6 you’d have to re-distribute all the data over the newly grown RAID, which takes ages, is error-prone and makes performance suffer.