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How many disk are damaged if system of RAID 5 with 4 disk is crashed?
Wiki User
∙ 15y ago
Sorry, but I disagree with Rtrahan once again. His answer doesn't even appear to apply to the question that is asked.
It seems that what the RAID array is telling you is that Disk #4 has failed and needs to be replaced. If you mean to say that your RAID array failed on you completely (such as due to a power outage) and you are wondering which of the drives (if any) are physically damaged, then the only way to determine that is to get into the diagnostics of the RAID array itself. In the diagnostics, it should tell you if any of the drives are degraded or failed. If you have only one such drive, then you can replace it and the array will rebuild itself (which is what it is designed to do, of course). If you have two or more in a degraded state, then I hope you have a backup because all your data is toast unless you want to send the array off to a data recovery lab and pay big bucks to have it restored.
RAID 5 arrays must have a minimum of three drives to be set up initially (but can be used with any number of drives that the computer or NAS or other RAID-compatible device can address). This is so that the data is striped across the drives and the equivalent of one drive is used for parity. Thus, in the case of a three-drive RAID 5, the amount of useful data storage is the equivalent of two drives. The same pattern continues as the number of drives increases: the capacity of the array is the total amount of storage of all but one of the drives. All drives in a RAID array must be the same size and ideally the same model.
For greater fault tolerance, RAID 6 is sometimes used. In this case, there are the equivalent of two drives with parity. This allows for two drives to fail rather than just one. The disadvantage is that RAID 6 requires a minimum of four drives to be used but can expand to any supportable number of drives beyond that.
If you have any questions or would like further assistance, feel free to drop me a line.
Wiki User
∙ 9y ago
Wiki User
∙ 15y agoRAID 4 is not used. RAID 5 uses three disk. Two to copy the data twice at the same time and a third also copying data in case one of the other two crash.
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What hard disk is used for a large computer system?
RAID
What can be used to provide fault-tolerance to a system?
RAID storage can be used to provide fault-tolerance to a system. With RAID, data is stored redundantly on a set of disks to mitigate against failure of a disk.
What raid level is disk striping with parity?
Raid 5
What describes a group of two or more disk drives that appear to the system as a single drive?
Raid Array.
What are levels of RAID?
There are 5 levels of the Redundant Array Inexpensive Disks system of data storage. RAID 0 is what most people have all ready i.e. one hard disk in the computer. RAID 1 is two disks that the data is saved to i.e. 1 internal disk and 1 external disk. RAID 2 is when the data is saved to 2 disks at the same time i.e. 1 internal and 1 external / network disk. RAID 3 is when the data is saved to 1 internal disk as well as the network disk and then backed up to a disk in a separate suburb. RAID 4 involves more disks and more complexity with data being stored on separate disk more like inserting pages into a book. I'm sorry but the complexities of RAID 5 is a subject I am still learning
Which type of RAID uses a dedicated parity disk?
RAID 3
What causes A Disk Read Error Occurred?
the logical choices is:: MAY BE YOUR DISK IS DAMAGED; SYSTEM MALFUNCTION; AND INVALID HARD DRIVE
What is raid and tell you about different tipes of Raid levels?
RAID is redundant array of inexpensive disks. You have a few disks that are connected and this gives you some advantages. Very simply the levels that you need to know about are: JBOD - Just a bunch of disks. If the RAID is 4 x 1.0 TB you see just that - 4 disks. RAID 0 - Striping . All the disks are connected. in the above example, you see one large 4.0TB disk RAID 1 - Mirroring. Every disk has mirror version. Half the disk can die and you loose nothing. In the above example you see a 2.0 TB disk. RAID 5 - one parity disk. If one disk dies, you loose nothing. In the above example you would see a 3.0 TB disk. RAID 6 - two parity disks. If two disks die, you loose nothing. A 8 disk system would have 6 disk of usable space. Check out Wikipedia for a full explanation.
A solar system may form from a spinning disk of material called an?
from when an objects crashed into earth and an chunk of rock form
How did planets and other objects in solar system form out of material in a disk?
from when an objects crashed into earth and an chunk of rock form
How did planets and other objects in the solar system form out of materials in a disk?
from when an objects crashed into earth and an chunk of rock form
How did the planets and other objects in the solar system form out of material in a disk?
from when an objects crashed into earth and an chunk of rock form
