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| hw:server:raid [2021/04/08 19:38] – niziak | hw:server:raid [2023/02/05 20:21] – 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: '' | ||
| Line 33: | Line 50: | ||
| * no possibility to expose disks directly to host (trick is to create one RAID0 per disk) | * no possibility to expose disks directly to host (trick is to create one RAID0 per disk) | ||
| * **H200** | * **H200** | ||
| - | * plain HBA | + | |
| * no raid | * no raid | ||
| * JBOD - all disks exposed to host (so called IT-mode) | * JBOD - all disks exposed to host (so called IT-mode) | ||
| * H310 | * H310 | ||
| - | * plain HBA | + | |
| + | * H330 | ||
| + | * 8 internal ports | ||
| + | * can be flashed into HBA [[https:// | ||