Noob NAS question

[HeroRareheart]

I have a noob question regarding my NAS. I pulled an old computer out of my local transfer station that had three 1.5 TB WD Greens in it, so I decided to set up this computer with TrueNAS and use it as a NAS. In a shocker to absolutely nobody one of the old 1.5TB WD greens has begun to fail after being used for only a few months. As I was aware that using older hard drives not designed for this use case which I literally found amongst the trash were likely to do this I set up all three drives in a raid 5 so I can lose a drive and not have to worry too much. As this drive is failing I want to preemptively purchase another one and install it in its place but I cannot find any new hard drives that are 1.5 TB. Could I purchase a 2 TB hard drive and just throw it in and then rebuild the array or will that cause a problem because it's a higher capacity than the drive it's replacing? I would assume this is not a problem but I want to double check before I do anything and potentially screw something up.

[Electronics Wizardy]

Yea you can use as 2tb drive just fine, the last 500gb just won't be used. If you replace all your other drives with 2tb drives, you will then get 4tb usable. If you want more space, id be tempted to slowly replace all the drives with 4 or 8tb drives.

[Catsrules]

Yes you can buy a 2TB drive in place. The extra 500GB will be unusable until you upgrade the rest of the 1.5TB drives. But that will be the only downside.

 

It could also be something with the Green Drives if remember correctly the green drives were notorious unreliable in a hardware RAID array but since your using software ZFS it should be a little more forgiving.

[HeroRareheart]

5 minutes ago, Catsrules said:

It could also be something with the Green Drives if remember correctly the green drives were notorious unreliable in a hardware RAID array but since your using software ZFS it should be a little more forgiving.

If I had to guess it's just age of the drives. The drive-in question is not yet dead or causing major problems but True NAS is spitting out unreadable and uncorrectable sector errors for it and the drives speeds are slowing down.