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| hw:server:raid [2021/04/08 19:38] – niziak | hw:server:raid [2021/04/08 19:48] – niziak | ||
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| + | ====== RAID ====== | ||
| + | * RAID0 - striping | ||
| + | * RAID1 - mirror | ||
| + | * RAID5 | ||
| + | * do not use | ||
| + | * very slow write | ||
| + | * rebuild takes days, and during rebuild another disk may fail = fatal | ||
| + | * RAID6 - striping with double parity (5+2, 13+2). | ||
| + | * minimum 4 disks | ||
| + | * allow 2 disk failure | ||
| + | * slower write than RAID5 (requires udpate parity on 2 disks) | ||
| + | |||
| + | Recommended levels for safety: | ||
| + | * RAID10 = RAID 1 + 0 = i.e two mirrors (RAID1) stripped as RAID0 | ||
| + | * RAID6 | ||
| + | * RAID60 = RAID 6 + 0 - two RAID6 sets stripped as RAID0 | ||
| + | |||
| ====== Raid controllers ====== | ====== Raid controllers ====== | ||
| * controllers where RAID can be disabled, and all disks are exposed to host are called: '' | * controllers where RAID can be disabled, and all disks are exposed to host are called: '' | ||