Replacing failed drive in RAID 6...Same Capacity vs Same RPM?

[Bigzaj]

I dropped a drive in a Raid 6 array that was a Seagate 1.5TB 7200rpm. I am looking for a replacement, not sure what would be best:

Seagate 1.5TB 5900RPM - same capacity down to the bit I would guess bc it probably uses the same platters.

Seagate/WD 2.0TB 7200RPM - bigger capacity so only going to use 1.5TB same speed and used capacity would match the other drives.

WD 1.5TB 7200RPM - same capacity and speed but i'm pretty sure the actual capacity would be slightly different than the other drives in the array and don't want it to be less.

Thoughts or suggestions?

 

[JRS]

....

WD 1.5TB 7200RPM - same capacity and speed but i'm pretty sure the actual capacity would be slightly different than the other drives in the array and don't want it to be less.

Thoughts or suggestions?

Why do you think the actual capacity would be slightly different?

I have 2TB Samsung, Seagate and Western Digital drives in my unRaid server and they are all the exact same size to the last byte.

 

[maxm]

Using larger drives is no problem, sure you lose the extra space but you also decrease access times. Sometimes this is done on purpose and it's called short stroking.

 

[drescherjm]

I have done larger drive replacements many times at work. I keep a few spare 2TB drives around for this purpose. They work fine (in linux software raid) even as replacements for 750 GB drives..

 

[feffrey]

I would replace it with the identical model number of the drive if possible. If not get one that is that has the same RPM as the other drives. Size does not matter, as long as it is bigger than the others. Keep the same RPM, as a slower drive could impact performance (might not be noticeable though)
I try to replace drivers with identical model number ones just to avoid problems. I have a few raid controllers that sometimes drop the speed from 3 to 1.5 on certain drives for no reason.

 

[402blownstroker]

Ideally same make and model, otherwise same spin speed same capacity or larger. Any half way decent RAID controller can handle the different drive geometries.