zfs cache and log in internal disk?

[Eero Volotinen]

Hi,

Installed freenas on optane pci-e ssd. Is there way to use that disk also as zfs cache + log disk?

At least it is not possible in gui, but maybe in shell?

Eero

 

[garm]

Holy taxation Batman!
Don’t install FreeNAS on Optane!!
Don’t use the same drive for slog and L2ARC!!

Unless you maxed out your memory don’t use L2ARC.
A slog needs battery backup and I don’t think your Optane have that? Are you sure your usecase will benefit from a slog?

 

[Eero Volotinen]

Holy taxation Batman!
Don’t install FreeNAS on Optane!!
Don’t use the same drive for slog and L2ARC!!

Unless you maxed out your memory don’t use L2ARC.
A slog needs battery backup and I don’t think your Optane have that? Are you sure your usecase will benefit from a slog?

Sorry, I am just stupid user :)

What is better solution? storage drives are 15 * 2,5TB sas (battery backuped) and only os is currently in optane pci-e drive.

--
Eero

 

[garm]

Usecase? Hardware? Topography?

 

[Eero Volotinen]

Usecase? Hardware? Topography?

Backup storage. Anyway, decided to buy more storage for log and cache.

Setup is something like this:

1* optane p90 for freenas installation
15* 2,5" sas/sata 2.5TB for storage
2* ssd for cache and logs
sata controller with backup battery (25 sata/sas 2.5" slots)

32GB bytes of memory. 2*Xeon quadcore

Does this sound good?

--
Eero

 

[SweetAndLow]

For backup a slog and l2arc will make zero performance improvement. Seems like you just enjoy spending money so go ahead if you want.

 

[garm]

the TCO on this system isn’t really justified but sure. Have fun.

Just one point, battery on the controller doesn’t help the slog, it needs its own backup.