Understanding Data Access and Write Operations in a Raid 5 Setup with Failed Hard Drive

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premchn

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Sep 11, 2014
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My question is I have 3 hard disk and configured with raid 5 if one hard disk fails will data be continue to written on other two hard disk and. will user be able to access or retrieve old data until we put the new hard disk.
 
Solution
Yes.... that's the whole idea behind Raid5 (to provide fault tolerance) although, you'll probably see I/Os slow to a crawl until you replace the failed drive and rebuild / reinitialize the set.
It's a very good idea in that type of configuration (if your hardware raid card / firmware (software) supports it) to configure something called a "Hot Spare" that's a 4th hard drive just hanging out, ready to jump in for the failed drive.
Most, but I suppose not all, hardware raid controllers support that setup.
Yes.... that's the whole idea behind Raid5 (to provide fault tolerance) although, you'll probably see I/Os slow to a crawl until you replace the failed drive and rebuild / reinitialize the set.
It's a very good idea in that type of configuration (if your hardware raid card / firmware (software) supports it) to configure something called a "Hot Spare" that's a 4th hard drive just hanging out, ready to jump in for the failed drive.
Most, but I suppose not all, hardware raid controllers support that setup.
 
Solution
Thanks Trouble. If the parity bit or data is on the failed drive how come users fetch data until we rebuild with new one. So every time it uses the xor or nor logic to construct the data.
 
premchn said:
how come
Click to expand...
Are you seriously asking me how come?
There must be thousands of webpages, courtesy of any search engine, that will provide you with that answer and I might add, likely far better than I could ever do.
Personally, I'm not sure I even remember how a striped set with parity actually works. I'm quite certain I knew all about it at one time, back when things like that were important to me.
Now, I'm affraid, like many other things..... I just take it for granted. Sort of like:
I don't know and understand how my refrigerator actually works but that's OK..... I still enjoy the cold beer it provides.
 
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