Basic Terms Of The Storage - Netbackup & I/O Multipath

Block : smaller part in the Disk is block.

group of the block is sector.

IOPS : Calculate in NO's (How many IOS happened while user login into the bank account).

Ex: 100 IOS.

Bandwidth: calculate in Amount (while user store the data in the portal is bandwidth).

Ex: 5 Gpbs.

Parity Bit (or) Check bit : is the simplest form of error detecting code.

RAID:

For Parity : Addition.

Refer: http://web.math.princeton.edu/math_alive/1/Lab1/ParAdd.html

Purpose for Distributed Parity rather than Dedicate Parity : while maintain the dedicated parity all the parity write into the one disk. so if the parity disk is loss then it is difficult to recover the data. In the same time if we maintain the Distributed parity then parity bit write across the disk so even though one disk is fail it won't affect to recover the data.

Raid 5 : Single parity with rotation.

Raid 6 : dual parity with rotation.

LAN BACKUP	STORAGE BACKUP
Maintain the backup with 1)storage 2)Backup Server 3)Tape Library	Maintain the backup with 1)Storage 2)Tape Library

Snapvalut - RO - Snapshot

Snapmirror -RW- Snapshot.

Data deduplication : is specialized data compression technique for eliminating duplicate copies of repeating data since only unique data is stored.

Network Deduplication : reduce the no o f bytes transfer between the end points.

NDMP - Network Management Protocol.

Netbackup Maintain

1)Backup Server(maintain the catlog)

2)Media Server (connected to the Storage).

Netvault - We can create the Virtual tape Library (VTP).

netbackup - We can't create the Virtual Tape library.

TAPE	DISK
1)Sequential read and write. So it will take long time.	1)randomly read and write the data. IOPS faster than the the TAPE Library.

Synchronous	Asynchronous
1)with Acknowledgment	1)without Acknowledgment.

Online Backup: Without shutdown the database or live OS take the backup using snapshot.

Online Agent(Net Backup): Hold the IOS(freeze IOS) and accelerate the backup in back end. simultaneously take the backup and get the IOS.

Oracle RMAN: IOS is not handle by the file system it control by the oracle. So we should take the script from the oracle to integrate with netbakcup.

VMDK - Virtual Machine Disk.

 

Storage Backup Software.

Normally for all the storage they will maintain two storage software 

one for configure Lun and RAID and another for take backup and recovery between disk and storage.For example

1)HP EVA STORAGE : configure Storage Lun and Raid controller.

2)HP DATA PROTECTOR : Backup and recovery Software – used for disk storage or tape storage target.

I/O Multipath : More than one Physical Path between the CPU in the compute and its mass storage.if we get 100IOS from the user .split 50 IOS into one path and another 50 IOS on another path.

Using I/O Multipath achieve

1. fault tolerance.
2. Performance enhancing technique (Load Balancing).

#multipath -ll

To Configure Multipath with Virtual Storage.

https://sites.google.com/site/tadbirsistem/rhel5-multipathing

Storage Port.

1 HBA has the two ports.

2 HBA has the one ports.

Every storage vendor have their own Multipathing S/W.