Storage - Oracle Cloud Infrastructure - Architect Associate(1Z0-1072-20)

 Oracle Cloud Infrastructure Architect Associate exam tests varieties of topics like

1. Identity and Access Management
2. Networking
3. Compute 
4. Storage
5. Database

A good place to learn about the topics are

https://docs.oracle.com/en-us/iaas/Content/home.htm

And there is a book specifically written for the exam and is available in Oreilly

https://learning.oreilly.com/library/view/oracle-cloud-infrastructure/9781260452600

In this blog, I am sharing the notes I have taken for the topic 

Storage

Object Storage:

• It is a regional service, bucket created in a region can be accessed across the region but other regions cant access
• Two types
• Standard - Hot
• Archive - Cold
• Pre-authenticated URL
• Cross-copy region
• Only standard bucket can be copied
• Archive bucket can't be copied
• Object versioning is by default disabled
• Object versioning can be enabled at bucket level only
• Object Lifecycle
• Rule to delete object after certain days
• delete will preside over archive rule
• policy can be enabled or disabled
• Policy will be applied to the bucket and filters can be added
• Multipart upload
• Individual parts of the object can be uploaded in parallel
• Can be done using the cli and sdk

Local NVMe and 

• Local NVMe is non-persistent but survives reboots
• for high throughput
• Local NVMe can be protected with duplicates/mirrors - eg: RAID1, RAID10, RAID6

Block Volume

• Durable as it has multiple copies in diffeent ADs etc
• Lets us store data beyond the lifespan of compute instance
• max of 32 block volume can be attached to an instance
• each block can be from 50GB to 32 TB
• Two ways to attach block volumes to an instance
• Paravirualized - light virtualization on top a remote storage and acts as like a local storage
• iSCSI - a local storage stack in the guest OS
• We can expand the block volume size when it is in offline 
• We can only increase but cant decrease

Backup and Restoration

• Snapshot of a block volume
• Will be stored into Object Store and will can be restored into any other ADs in same region
• The backup volume can be used in different region

Clone and Volume Group

• Clone is point in time direct disk to disk deep copy
• Clone can be created only in the same AD without detaching the source from the instance
• Clone can be done across region as like backup
• Clone and backup cant be done at same time
• We can group multiple Block and Boot volumes and call it as a Volume Group. This Volume group can be cloned/backup which will cause individual volume to be clones/backedup

File System Storage

• Supports Network File System
• Need to create a resource called MountTarget in a AD which can be accessed by all ADs in the region
• It is recommended to define MountTarget in dedicated subnet - MountTarget requires 3 IPs for HA so we cannot use /30 + CIDR
• We can create 100 NFS client per mount target
• We can connect from on-prem using the fastconnect
• No two overlapping export path should be defined in mount target
• Following ports needs to opened in
• Stateful ingress - TCP 111, 2048, 2049, 2050. UDP 111, 2048
• Stateful egress - TCP 111, 2048, 2049, 2050. UDP 111
• Provides File Snapshot - 10000 snapshots per filesystem