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Forum Discussion
Performance halved at a stroke (ReadyNAS Duo, 4.1.8) ...
In a busy few weeks, my little ReadyNAS Duo's performance seems to have halved at a stroke. The problem seems to be a consequence of upgrading to RAIDiator 4.1.8 (release) and performing a full facto...
Still running with one disk, I decided to bite the bullet and downgrade to 4.1.7 again ... if only for educational value. As I've kept my existing volumes, configuration and data this time, this isn't virgin 4.1.7 per se but it should be good for reference.
While there's a noticeable increase in performance, it isn't anywhere near pre-4.1.8 levels ...
CIFS (1 disk)
Read: ~19 MB/s (unchanged)
Write: ~12 Mb/s (higher than the previous 10 MB/s)
NFS (1 disk, 1 thread, sync mode enabled)
Read: ~15 MB/s (higher than the previous 11 MB/s)
Write: ~9 MB/s (higher than the previous 8 MB/s)
A factory reset may well help but that would introduce variables I'd hoped to avoid ... data would be laid out differently on-disk and (while the impact should be fairly subtle as the same data is being restored as previously and fragmentation is being eliminated in the process) performance characteristics would undoubtedly change.
If the earlier 4.1.8 factory reset had changed things like partition layout/alignment for the worse (an example out of the air, I'm not suggesting it has) the changes would still be affecting the downgraded system.
Thanks,
Justin
Update: second disk replaced and resynched ... performance is pretty much the identical. Guess there's little-to-no performance advantage to running two disks in XRAID.
While there's a noticeable increase in performance, it isn't anywhere near pre-4.1.8 levels ...
CIFS (1 disk)
Read: ~19 MB/s (unchanged)
Write: ~12 Mb/s (higher than the previous 10 MB/s)
NFS (1 disk, 1 thread, sync mode enabled)
Read: ~15 MB/s (higher than the previous 11 MB/s)
Write: ~9 MB/s (higher than the previous 8 MB/s)
A factory reset may well help but that would introduce variables I'd hoped to avoid ... data would be laid out differently on-disk and (while the impact should be fairly subtle as the same data is being restored as previously and fragmentation is being eliminated in the process) performance characteristics would undoubtedly change.
If the earlier 4.1.8 factory reset had changed things like partition layout/alignment for the worse (an example out of the air, I'm not suggesting it has) the changes would still be affecting the downgraded system.
Thanks,
Justin
Update: second disk replaced and resynched ... performance is pretty much the identical. Guess there's little-to-no performance advantage to running two disks in XRAID.
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