Create a mdraid without hours/days of resync ?

Hi

im not new on linux software Raid - so my point of View is that after raid creation the Raid has do do a first resync wich takes some time ...

In my new Setup raid6 with 4 10TB Drives

md0 : active raid6 sdd[3] sdc[2] sdb[1] sda[0]
      19532609536 blocks super 1.2 level 6, 512k chunk, algorithm 2 [4/4] [UUUU]
      [>....................]  resync =  0.2% (28918656/9766304768) finish=14959.6min speed=10848K/sec
      bitmap: 73/73 pages [292KB], 65536KB chunk

This assume to be arround 4 days ...

Im woder if i look at NAS SYSTEMS wich also working with Linux System and mdraid linke Synology Terramaster and so on ...

The first raid Init assume to take 5 minutes ...

Do they use other method or something else wich makes first init in a other way ?

Best regards

Hi

i know ZFS - thanks for the hint.

even i wonder how synology and co do it with default mdraid ...

Here i have a Terramaster NAS Station (What a crap) - but Raid init takes 20 Seconds für same amount of Space ... - and they use mdraid and lvm on top