A workstation has RAID 1 and RAID 5 arrays. Although performance is not degraded, management software is reporting a hard disk failure. Which of the following should a technician do NEXT?
Citing no degradation is misleading. If you have a RAID 5 and one drive fails, you WILL have degraded performance. Same for RAID 6. I have experienced this many times. Slow as molasses while disk remains failed and during the re-build. If you have a RAID 1 disk fail, you likely will not note any degradation as the disks are mirrored. I would go with checking RAID 1 first, but CompTIA likes to make the practical, impractical.
Which is faster RAID 1 or 5?
Raid 1 has a relatively slow write speed, slower than using a single disk. RAID 5 has a write speed much faster than a single disk, but lags slightly due to the need for creating parity data.Apr 8, 2021
RAID 5 Degrades in performance when a disk is lost
RAID 1 Mirrored you won't notice a performance decrease when a disk is lost.
RAID 0 = Striped volume (min 2 drives) (NOT fault tolerant)(High capacity)(speed)
RAID 1 = Mirrored (min 2 drives) (fault tolerant)(relatively expensive)
RAID 5 = Striped with parity volume (min 3 drives) (has fault tolerance)(good reading)
RAID 6 = Striping with double parity (min 4 drives) (has fault tolerance)(good reading)(slow to rebuild)
RAID 10 = RAID 1 + RAID 0 (min 4 drives)(nested)(A striped set from a series of mirrored drives)
It has to be RAID1. Mirroring by definition allows one drive to fail but the RAID will continue to operate at the same speed, or no performance hike. However the bad drive will still be recognized and identified by the RAID controller.
The answer is RAID 1 needs to be checked. If RAID 5 was dying, it would have performance drgradation. No degradation = not RAID 5... it has to be RAID 1 that needs to be checked.
RAID 1 and RAID 5 make a RAID 10 supplementing each array on the side with RAID 5s.
RAID 1
_ |_
RAID 5 Array RAID 5 Array
RAID 1 is working since its using redundancy to access things from both RAID 5s on both arrays. However, hard disk failure lliterally means one of the Hard drives have failed. Since Raid 1 is working fine =, than you have to check the RAID 5 drives.
I believe the answer is RAID-1. When RAID-1 suffer a failed disk it doesn't lose much performance since it just duplicating the same data on another drive (in fact the performance would improve).
If RAID-5 suffer a failed disk, it would be extremely slow, because each disk sector must be recovered by reading information from the good drives and performing a mathematical reconstruction.
You can read more here (do control f "consequence of raid-5 degradation): redsharknews.com/technology-computing/item/877-raid-everything-you-need-to-know
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