RAID Disk - Redundant Array of Independent Disks

Giriş

RAID bir sürü işi görebilir. Açıklaması şöyle. Konfigürasyona göre redundancy için kullanılabilir.

In general, the purpose of a RAID, depending on the chosen Raid level, provides a different balance among the key goals data redundancy, availability, performance and capacity.

Açıklaması şöyle.

RAID is not a backup mechanism; it's a redundancy mechanism
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The main advantage of a redundant system is that it will not go down completely when a complete disk failure happens – the mirror allows you to continue using the NAS without interruption while the array is rebuilding.

RAID 5 ve RAID 6 var

Hardware RAID ve Software RAID

LSI, DELL, HP gibi üreticiler Hardware RAID sağlıyorlar. Açıklaması şöyle

Q : RAID with different drive types possible?

A : Hardware RAID controllers from LSI, DELL, HP etc. does not allow mixing disks with different interfaces (eg: SATA and SAS) in a single array. What you can do is to create two different arrays, each for a specific interface protocol - a SATA array and a SAS one, for example.

Software RAID does not share this limitation - basically any block device (even a loopback device) can be part of any arrays. However, mixing different disk technologies is generally discouraged to avoid an unbalanced array (performance wise). For cache drives, as ZFS L2ARC or LVM dm-cache, things are different - here you actually want a faster drive. So, for example, using an NVMe cache in front of a SATA array is perfectly fine.

RAID 6

Kırmızı/Mavi ışık yanıyorsa bir disk senkronizasyonu kaçırmıştır ve "Rebuild" işleminde olabilir.