storage

Question 1

What are three types of storage access?

Answer 1

Direct access storage (DAS) BLOCK I/O
Storage area network (SAN) block IO
- (iscsi or fibre channel)
Network Attached Storage (NAS) file IO
- NFS or SMB/CIFS

Question 2

What is ssd cashing?

Answer 2

.

Question 3

how do you gain availability?

Answer 3

assigning disk redundancies

•RAID 0•RAID 1•RAID 5•RAID 6•Hot spare•RAID Controller

Question 4

What are storage spaces

Answer 4

New approach to storage
•Software defined
•Treat collection of disks as Just a Bunch of Disks (JBOD)
•Create storage pool from physical disks
•Create virtual disks from pool
•Virtual disks can be configured for higher performance or fault tolerance

Question 5

What are storage space advantages?

Answer 5

• Pools of storage dont have to be identical
• more effiecent due to thin provisioning
• can easily expand or contract the pool
• Eliminate expensive disk controllers

Question 6

Storage space disadvantages?

Answer 6

cpu is much more heavily taxed
- processor was handled by disk controller
less proven and understood
- you still need to provide IOP’s and availability
Thin provision storage must be more frequently monitored