ReadyNAS slow write speed

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micb wrote:

Believe it was unchecking 'strict sync' as you described. Our 280MB file now saves in 20 sec instead of 20minutes!! what a relief!

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Great!

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micb wrote:

 

I have left the disc spin down function on also..

 

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That should be fine.

SMB transport encryption can also slow down your particular NAS, because the RN300 series doesn't have hardware support for encryption. If your security policies don't require SMB transport encryption you can try turning it off and see if you get any further speedup. 

Personally I'd leave quota and snapshots enabled, as I think they are worth the performance hit.  Note that enabling quota for the volume gives you better visibility into volume space usage (which is helpful even if you don't set quotas).

For snapshots,  you do need to take the "churn" into account, as the space needed can build up quickly.  If you have applications that update files in place frequently (for instance, databases), then you shouldn't use snapshots on those shares.  I recommend using custom snapshots instead of the default "smart" snapshots - setting a max retention, so the snapshot use will continue to grow over time.  With BTRFS you do want to keep at least 20% free space. 

Running the balance and defrag maintenance functions periodically can also help maintain performance.  However, they can take a while to complete (especially if they've never been run), and performance will drop while they are running.  So perhaps try running a balance over the weekend (assuming usage is light then).  You can cancel it if the performance impact is too much.  I run each of the maintenance functions once every three months.