KevinM
Contributor
- Joined
- Apr 23, 2013
- Messages
- 106
I just ordered a couple of 6048r-e1cr36l 36-drive supermicro boxes with 8 tb hgst nearline sas drives, chelsio t520 nics, 256 gb memory and intel p3700 nvme cards for zil and l2arc. I have a couple of other boxes I'll be using as replication targets, so I want these new systems to be reasonably fast. Use case will be nfs for vmware datastores and nfs mounts for various linux servers, direct-attach iscsi for veeam and various other servers, and other misc stuff.
I've been playing with the zfs space calculator at https://jsfiddle.net/Biduleohm/paq5u7z5/1/embedded/result/, and if I'm understanding the results correctly, it's saying I have 103 tb usable, not including 25 tb which is the minimum recommended free space amount? If that's the case, if I want to follow best practice and not use more than 50%, I'm realistically looking at ~50 tb per box. Does 50 tb usable sound like a reasonable expectation if starting with 288 tb raw?
I've been playing with the zfs space calculator at https://jsfiddle.net/Biduleohm/paq5u7z5/1/embedded/result/, and if I'm understanding the results correctly, it's saying I have 103 tb usable, not including 25 tb which is the minimum recommended free space amount? If that's the case, if I want to follow best practice and not use more than 50%, I'm realistically looking at ~50 tb per box. Does 50 tb usable sound like a reasonable expectation if starting with 288 tb raw?
Code:
Drive size: 8 TB Number of drives: 36 RAID type: Mirror (requires at least 2 drives) MTTPR: 72 h Rebuild speed: 100 MiB/s TiB TB % Drive size 7.276 8 N/A Total parity space 131 144 50 Total data space 131 144 50 Total RAID space 261.9 288 100 Metadata overhead 2.095 2.304 1.6 Blocks overhead 0 0 0 Total overhead 2.095 2.304 1.6 Minimum recommended free space 25.77 28.34 19.68 Usable data space 103.1 113.4 78.72