NetApp E-Series



Controller State:

 

Optimal - The remaining controller marks the internal state of its alternate as 'Not Present"

Quiesced - The remaining controller marks the internal state of its alternate as "Not Present". No I/O requests are processed until the state is no longer quiesced.

Service Mode - The remaining controller marks the internal state of its alternate as "Not Present". No I/O requests are processed until the state is no longer service mode.

Suspended - The remaining controller becomes Online.

Lockdown - The remaining controller remains in the Lockdown state.

Offline - The remaining controller is released from reset, enter the Service Mode state, and the process with Start-of-Day(SOD) processing.

7-segment display code 

Dynamic Disk Pools:

 

These were initially called CRUSH(Controlled Replication Under Scalable Hashing)

Stripe with 3 segments - 1 segment on drive 1, 2nd segment on drive 2, 3 segment on drive 3

volume with 3 piece - 1 piece on drive 1, 2nd piece on drive 2, 3 piece on drive

piece 1 contains all segment on drive 1,  piece 2 contains all segment on drive 2

segment combine to for strips
piece combine to for volume
 

Stripe are broken in segments. All segments residing on drive is called  Pieces.  Each piece of the drive is written to disk of raid group.

 

In DDP C-Stripe or D-Stripe - 5GB (4GB data and 1GB parity)

C-Piece or D-Piece

Stripes always has 10 piece irrespective of the number of disks in Dynamic pools.

Each Raid 6 Stripes is 1MB (8+2 with 128K segment size)

C-stripe has 4096 traditional Raid 6 Stripes

No drive contains two C-piece from the Same Stripes. Each C-Piece is 512MB in size.

Preservation Capacity

When disk pools are created, a certain amount of capacity is preserved for emergency use.  This capacity is expressed in terms of a number of disks in the management software but the actual implementation is stored across the entire  pool of disks.  The default amount of capacity that is preserved is based on the number of disks in the pool.

preservation capacity 0 - 10 disks.  Preservation capacity is active.

Dynamic Pools - TPV

4GB minimum repository size and expansions must be in 4GB increments.

Virtual capacity can be specified between 32MB to 63TB.

Provisioned capacity between 4GB and 64TB. Provisioned capacity quota limits automatic expansion of repository. Quota equals provisioned capacity when expansion mode is manual.

 

 

DS5300 - 7.3x - 10.73

MD3260 - DE6600 - 60 drives /DE5600 - 24 drives /DE1600 12 drives - 4U/2U - 6Gbps ESM
DE460C/DE224C/DE212C - 4U/2U - 12Gbps IOM
MD3460 - E2760 80.20.x - 11.xx
E2800,E5700 - 8.4x - 11.84 (Embed Web User Interface)

Dacstore - All configuration information is stored in Dacstore. Dacstore is stored on all drives but is invisible to hosts and users.  Capacity reserved for dacstore is subtracted from the usable capacity of a volume group. Dacstore resides on innermost portion of the disk drives.  Read/Writes to innermost tracks are slower and the faster outer track are reserved for customer data.
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