Comment on Western Digital details 14-platter 3.5-inch HAMR HDD designs with 140 TB and beyond
wltr@discuss.tchncs.de 1 week agoThanks! So, why does it matter? It’s a server, you can have it to do the job unattended. Or does it affect other services and you’re unable to use anything else before it finishes?
SmoothLiquidation@lemmy.world 1 week ago
It will take a long time and while it runs it will use a lot of resources so the server can be bogged down. It is also a dangerous time for a NAS, because if you have a drive down, and another drive dies, the whole pool can collapse. The process involves reading every bit on every drive, so it does put strain on everything.
Some people will go out of their way to buy drives from different manufacturing batches so if one batch has a problem, not all of their drives will fail.
The way striping works (at an eli5 level) is you have a bunch of drives and one is a check for everything else. So let’s say you have four 10tb drives. Three would be data and one would be the check, so you get 30tb of usable space.
In reality you don’t have a single drive working as a check, instead you spread the checks across all of the drives, if you map it out with “d” being data and “c” being check it looks like this: dddc ddcd dcdd cddd
This way each drive has the same number of checks on it, and also why we call it striping.