From 62c0612eac9dca9fd3b4f2381f571363794cd01e Mon Sep 17 00:00:00 2001 From: GarimaKapoor Date: Fri, 5 Aug 2016 11:35:03 -0700 Subject: [PATCH] Update README.md --- docs/erasure/README.md | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/docs/erasure/README.md b/docs/erasure/README.md index 1b68e0890..69bd44e34 100644 --- a/docs/erasure/README.md +++ b/docs/erasure/README.md @@ -12,10 +12,13 @@ Erasure code is a mathematical algorithm to reconstruct missing or corrupted dat ## Why is Erasure Code useful? -Erasure code protects data from multiple drives failure unlike RAID or replication. Minio encodes each object individually with a high parity count. Storage servers once deployed should not require drive replacement or healing for the lifetime of the server. Minio's erasure coded backend is designed for operational efficiency and takes full advantage of hardware acceleration whenever available. +Erasure code protects data from multiple drives failure unlike RAID or replication. For eg RAID6 can protect against 2 drive failure whereas in Minio erasure code you can lose as many as half number of drives and still the data reamins safe. Further Minio's erasure code is at object level and can heal one object at a time. For RAID, healing can only be performed at volume level which translates into huge down time. As Minio encodes each object individually with a high parity count. Storage servers once deployed should not require drive replacement or healing for the lifetime of the server. Minio's erasure coded backend is designed for operational efficiency and takes full advantage of hardware acceleration whenever available. ![Erasure](https://raw.githubusercontent.com/minio/minio/master/docs/screenshots/erasure-code.jpg?raw=true) +### RAID vs Erasure +Erasue code protects data + ## What is Bit Rot protection? Bit Rot also known as Data Rot or Silent Data Corruption is a serious data loss issue faced by disk drives today. Data on the drive may silently get corrupted without signalling an error has occurred. This makes Bit Rot more dangerous than permanent hard drive failure.