what will happen if there was a power outage like what happen to the raid 0 configuration and will there be data loss ?

[RRK]

hey i am trying to do raid 0 and i was thinking about the liabalilty of raid 0 config.if the drive was not writing any data will the raid 0 config get courrpted ?

[SteveSimecek]

4 minutes ago, RRK said:

hey i am trying to do raid 0 and i was thinking about the liabalilty of raid 0 config.if the drive was not writing any data will the raid 0 config get courrpted ?

It can possibly corrupt the array and you will lose the data (Or will lose it over time with repeated power losses). Some arrays are far more sensitive to this (RAID0) than others.

 

In normal operation, the data (loaded in your system memory; which is lost when the PC is turned off / power is lost) is able to get safely written back to the hard drive when you shut down the PC. In a power loss situation, whatever data the RAID card was processing in the RAM (It might be doing calculations before writing the files back to the drives) gets lost. This can corrupt the array over time / result in lost data for you.

 

The problem is worse with hardware RAID controllers without a battery backup on card. On hardware RAID controllers, they have a dedicated RAM cache on the card which they use to cache recently used data, and usually don't write the data back to the drives unless you shut down the PC or new data needs to be cached. On your average controller, this is 512MB or greater). So in a sudden power loss, whatever data was in that cache that didn't make it back is lost. 512MB and greater is a lot of data to lose from your array. If you get a hardware RAID card, do make sure to get the on card battery for it, it's saved me several times through several power losses (No, I don't have a UPS...working on getting one).

 

The other scenario is if the RAID controller manages to write data to one drive but for some reason didn't make it to writing it to the other drives in the array. When the controller starts back up, it's got to figure out what data is actually good or bad. In the worse case, it'll mark a drive as corrupt.

[emosun]

A power outage wouldn't affect a raid 0 config unless the config somehow relied on random access memory ( which wouldn't really be common or probable)

I mean when they invented raid they didn't exactly overlook sudden power loss

[manikyath]

if you're not doing raid0 trough a controller with on-board caching, a power loss on your raid0 is pretty much the same as power loss on a single disk. there's no parity to be calculated, there's only writes being splut between two drives.

[YoungBlade]

Power loss can always result in data loss, and RAID doesn't change that nor make it worse. Most consumer drives don't have a means to write data sitting in the cache in the event of a power outage. Enterprise drives often do, and as do some prosumer drives, but basic ones generally don't. So if the OS has written data to the drive, but the data is just sitting in the cache, while not yet having been written to the drive itself, then that data can be lost.

 

If you're worried about the array itself, a power loss generally shouldn't hurt it, but as with anything, it is always a good idea to have a backup. That way, even if the array does get corrupted, you don't lose anything too critical.

[PDifolco]

30 minutes ago, emosun said:

A power outage wouldn't affect a raid 0 config unless the config somehow relied on random access memory ( which wouldn't really be common or probable)

I mean when they invented raid they didn't exactly overlook sudden power loss

Can be if you use RAM as disk cache...

 

Anyway on RAID0 you'd better either put data that has backup or can be reinstalled easily (Steam games ..), or use an UPS 

[wONKEyeYEs]

51 minutes ago, RRK said:

what will happen if there was a power outage

UPS.

[GuiltySpark_]

Being worried about data loss on a RAID0, interesting.