meta data for this page
Differences
This shows you the differences between two versions of the page.
| Next revision | Previous revision | ||
| hw:server:raid [2021/04/08 14:16] – created niziak | hw:server:raid [2023/07/13 10:40] (current) – niziak | ||
|---|---|---|---|
| Line 1: | Line 1: | ||
| + | ====== 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: '' | ||
| + | * H200 | ||
| + | * H310 ??? | ||
| + | * PERC 6 (no '' | ||
| ===== Dell ===== | ===== Dell ===== | ||
| - | * SAS6 | ||
| * SAS1 - 3Gbps | * SAS1 - 3Gbps | ||
| + | * SAS5E | ||
| + | * SFF-8470 connector | ||
| + | * supported by MD3000 (the same SFF-8470 connector) | ||
| + | * SAS6E | ||
| + | * SFF-8088 connector | ||
| + | |||
| * PERC 6 | * PERC 6 | ||
| * no memory | * no memory | ||
| Line 13: | Line 39: | ||
| * memory | * memory | ||
| * 3Gbps connector, requires such midplane | * 3Gbps connector, requires such midplane | ||
| + | * no possibility to expose disks directly to host (trick is to create one RAID0 per disk) | ||
| * PERC 6iR (PERC 6 I/R) | * PERC 6iR (PERC 6 I/R) | ||
| * H series - SAS2 - 6Gbps - different connectors comparing to SAS1 | * H series - SAS2 - 6Gbps - different connectors comparing to SAS1 | ||
| Line 21: | Line 48: | ||
| * memory slot | * memory slot | ||
| * must be inserter into dedicated PCI RAID slot | * must be inserter into dedicated PCI RAID slot | ||
| + | * 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 | + | * JBOD - all disks exposed to host (so called IT-mode) |
| + | * H310 | ||
| + | * **plain HBA** | ||
| + | * H330 | ||
| + | * 8 internal ports | ||
| + | * can be flashed into HBA [[https:// | ||
| + | |||
| + | |||
| + | [[https:// | ||