Should I have a hot spare with RAID 5?
RAID 5 should never exist with a hot spare (warm spare.) RAID 6 is always a better use of the same drive count. There is no space/capacity advantage or cost advantage to the RAID 5 solution (but some small performance advantage) but it does a ton for mitigating things like URE risk.
Can you do RAID 5 4 drives?
The Storage Bits take The attraction of RAID 5 is that it gives you 3 drives worth of capacity on a 4 drive array – but at the cost of having to use backups if an URE is encountered. Better to use RAID 1 and get 2/3rds the capacity of RAID 5 with a much lower chance of data loss.
What is RAID 5 hot spare?
What is a hot spare drive? Hot spares act as standby drives in RAID 1, RAID 5, or RAID 6 volume groups. They are fully functional drives that contain no data. If a drive fails in the volume group, the controller automatically reconstructs data from the failed drive to a hot spare.
What is better a RAID 5 with a hot spare or RAID 6?
Therefore, RAID 5 and RAID 5 with Hot Spare disk offer the same level of protection – single disk failure. In contrast, if a disk fails at RAID 6 array, the recovery will start only after the faulty disk is replaced manually.
Is hot spare necessary?
A hot spare RAID is the spare disk in the array. It is not used in any way and is needed only at a certain time. This time comes in the event of a failure of one of the array drives. The RAID controller starts the RAID rebuilding procedure and uses a hot spare disk to replace the failed disk.
What is the difference between RAID 4 and RAID 5?
RAID 4 implements parity by using a dedicated drive to house all parity data, while RAID 5 distributes parity across all drives in the RAID group. RAID 5 uses the equivalent of a single drive for parity operations but distributes parity data among all drives in the RAID set.
Is a hot spare worth it?
As is said in almost every theory, using a hot spare disk with ZFS, Solaris FMA or in any other data storage environment is a good solution as it will automatically react to damage in a Redundant Array of Independent Disks (RAID) array and a hot spare disk indeed helps to minimize the duration of a degraded array state …
How do you set up a hot spare?
Configuring a RAID Group Hot Spare
- Go to Main Menu > Storage & Snapshots > Storage/Snapshot.
- Verify that the NAS contains one or more available disks.
- Select a storage pool or single static volume.
- Click Manage.
- Select a RAID 1, RAID, 5, RAID 6, or RAID 10 group.
- SelectManage > Configure Spare Drive.
How do I make my drive a hot spare?
3. Assigning dedicated hot spare
- Enter the Dell PERC 10 Configuration Utility.
- Click Main Menu > Physical Disk Management.
- Select the physical disk.
- From the Operations drop-down menu, select Assign Dedicated Hot Spare.
- Click Go.
- Select the Confirm option.
- Click Yes.
- You can check the status of the physical disk.
Why is RAID 5 bad?
Losing a second drive in a RAID5 array will result in catastrophic unrecoverable 100% data loss.