FAS8020 - SATA Configuration

[HenryUK]

Hello

I have a FAS8020 Cluster-mode set up as a SAS/SSD Hybrid which is going all well

but i also have a DS4246 with 24x2TB Sata drive that i need to gain the most capacity out of - we are not using this storage yet and it is set up with only 27TB of space which i would of thought should give me alot more

what would be best raid setup be if it was going to blow it away and start again

[rwelshman]

what version of DOT are you running? The maximum for SATA disks in a single raid group is typically 20, so that would leave 4 spares, with two for parity, leaves 18 x 2TB for data.

I would do one raid group of 20.

[aborzenkov]

2x11 RG gives the same 18 data disks with greatly improved rebuild time.

[rwelshman]

Good point, RG size of 11 would be good, also leaves only 2 spares instead of 4 idle disks.

[HenryUK]

thanks for the replies

i am running DOT: 8.3

what would be the max capacity i would get from these configurations?

[Stefan-Reitmeier]

for sata 2tb disk it should be around 1.64tb per data disks. so with raiddp 2x11rg you should get 18x1.64=29.5tb. One rg with 18 data disks would be same size, but you only have 2 parity disks instead of 4. But you have 4 spares 🙂

With an update of another 24 disk you could go for 3x15rg for example with only 3 spares.

If you have a spare ssd storage pool partition you should think about adding one to your sata aggregate as they really help with io bottlenecks on sata drives.