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Readynas OS 6 Massive Performance Decrease
Hi,
I just updated my Readynas Ultra 4 to OS 6, and am now experiencing a huge performance difference.
Previously, I could read at around 110MB/s constantly over a gigabit connection. Now, I barely make 40, and even then speeds are very inconsistent. I have tried different configurations such as Teaming (multiple methods), changing MTU and the likes.
Operations can sometimes start fast and then get exponentially slower (sometimes even stop completely) then start back up again at reduced speeds.
Both SMB and NFS show similar bad speeds.
Write speeds suffer similarly, being both slow and inconsistent.
I am wondering if this has anything to do with BTRFS, or if there is anything I can do to fix this issue.
I am using WD Green drivesx3, running RAID-5 (XRAID2) on a fresh install of 6.0.4.
I know Ultra 4 on OS 6 isn't supported, just wondering if such a performance drop is expected.
I just updated my Readynas Ultra 4 to OS 6, and am now experiencing a huge performance difference.
Previously, I could read at around 110MB/s constantly over a gigabit connection. Now, I barely make 40, and even then speeds are very inconsistent. I have tried different configurations such as Teaming (multiple methods), changing MTU and the likes.
Operations can sometimes start fast and then get exponentially slower (sometimes even stop completely) then start back up again at reduced speeds.
Both SMB and NFS show similar bad speeds.
Write speeds suffer similarly, being both slow and inconsistent.
I am wondering if this has anything to do with BTRFS, or if there is anything I can do to fix this issue.
I am using WD Green drivesx3, running RAID-5 (XRAID2) on a fresh install of 6.0.4.
I know Ultra 4 on OS 6 isn't supported, just wondering if such a performance drop is expected.
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- 6.0.5 is due for release soon. You may wish to check the performance on that once it has been released.
If the performance is too slow for you you can go back to 4.2.x firmware but that would require another factory default (wipes all data, settings, everything). - Yeah, hopefully 6.0.5 does improve things (raw I/O speed wise). I've tried changing just about every setting short of changing to Flex-raid, nothing seems to provide reliable speeds.
Sometimes I can achieve ~80MB/s, sometimes I can't. CPU usage wise SMB usually uses around 20-30% when doing operations.
Here are some transfer screenshots (using SMB obviously). Connected via direct 3M CAT6 gigabit line/9000 MTU.
I've also tried disabling the WDIDLE3 timeout on the drives, enabling write caching etc... but still have this inconsistent speed. - Would it be worth replacing these drives with WD Red drives?
I'm guessing they will perform better and be much more future-proof, however, I would still hope performance is the same (or better, of course!) as 4.2. - What disks are you using at the moment?
WD RED disks aren't the best disks performance wise but they are designed for NAS use.
I don't expect changing the disks would have much impact on performance. - 3x WD20EARX Caviar Green's (2TB).
We just found something interesting - on a client running Linux Mint 14 transfer speeds reported 30-40MB/s (AKA terrible) performance, however on the same system running Windows transfer speeds were 80-90 as expected.
Just something to add.
Also, I noticed that one of my disks were occasionally (once or twice every 10-15 mins I think - more often at the moment) clicking somewhat noticeably, which I guess could be a sign that it should be replaced.
The disks are around 2-3 years old by now. - Replacing the disks would be a good idea then.
- Someone with concrete data please tell me what is so good about WD RED drives......
They have better warranty, yes. But apart from that I have yet to see a single FACT that they perform, live or survive better in a NAS environment than other drives. A pure marketing exercise if you ask me, to charge more money for turning off TLER.
Otherwise, it's the same drive, same technology. I'm not complaining, the TLER disable and increased warranty is worth the extra. But let's stop pretending all the other drives are not as good in a NAS - sticking RED on it doesn't make it a better drive.
(The click of death should be picked up in SMARTs, but is usually not a good sign!)
Opinions of course vary. I've been happy with mine.ihartley wrote: Someone with concrete data please tell me what is so good about WD RED drives...
http://www.anandtech.com/show/6157/west ... he-premium did a pretty good test. Their conclusion:On the basis of our evaluation, we have no reservations in recommending the WD Red lineup as the drives of choice for a NAS system. As usual, it is extended usage and consumer reports a few months down the line which will tell the true story. At the moment, however, WD does have a winner in the NAS market segment with the WD Red hard drives.
.- Hi,
Another interesting performance test. I'm happy with the speeds varying between 80-60MB/s, but notice the large (and lengthy) drop of speed that occurs more than once:
Surely smbd at 14% CPU isn't responsible for this drop in speed. Not sure where to go from here either than everything magically working when (if) I replace the drives. - You'll also notice that readynasd process is always using CPU, even while sitting idle.
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