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Forum Discussion
ReadyNAS 4200 poor write performance
Hi All,
We've had a Readynas 4200 in service for a while as a backup of retired computer images
The NAS connects to a 2019 server using iSCSI on a single gigabit NIC
No errors showing on the NAS in terms of raid, drives, network or anytthing like that
No network related issues on the switch (new switch stack around a month ago)
Read performance on the unit is fine (we get around 90MB / sec sustained copy)
Write performance on the unit however is terrible, starting around 150MB / sec sustained copy then tanking after a couple gig copied to 10 - 20MB / sec, write have prevbiously been similar speeds to reads
Yes, I know it's an older unit, but there's nothing to indicate we have a hardware problem, a couple of disks have 1 or 2 reallocated sectors, but they're not growing rapidly
I've tried setting write cache on and off to see if that makes a difference and the performance is the same, as above read performance is fine but write performance is awful
Volume usage is 86% of approx 18TB available on the nas, our iSCSI volume is 16TB in size (so I don't believe the volume use would change anyway as the filesystem is managed by the Windows server it's connected to
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gleach wrote:
Write performance on the unit however is terrible, starting around 150MB / sec sustained copy then tanking after a couple gig copied to 10 - 20MB / sec, write have previously been similar speeds to reads
Sounds like you might have some SMR disks installed. What disks are you using (manufacturer/model)?
Have you done anything to check the disk health?
Hi StephenB,
We're using Hitachi disks in the NAS, it's been running for a few years (probably close to 3 years) without any write performance issues, hence asking here to try and figure out what's going on with it
Drive model of most of the drives is HUA722020ALA330 with a couple of HUA723020ALA640 as well, from what I know of the history of the unit, the 330 drives are what came with it when it was purchased, they're only 2tb drives so not sure if there even would be smr drives of that capacity and age, I've checked and they are listed as enterprise drives so unlikely to be smr
I've checked the smart status of all the drives and 2 or 3 have a couple of reallocated sectors but nothing growing, no failed drives or anything like that
I've tested write performance from the server that the NAS is connected to via iSCSI and the write performance is still poor
gleach wrote:
Drive model of most of the drives is HUA722020ALA330 with a couple of HUA723020ALA640 as well, from what I know of the history of the unit, the 330 drives are what came with it when it was purchased, they're only 2tb drives so not sure if there even would be smr drives of that capacity and age, I've checked and they are listed as enterprise drives so unlikely to be smr
The drives were launched 10-13 years ago. No idea when WD stopped making them (they phased out the Hitachi brand in 2015).
These would be CMR. I don't know of any enterprise class SMR drives. Most desktop drives between 2 and 6 TB are now SMR. WD Reds are as well (though WD Red Plus and Red Pro are CMR).
Do you only use iSCSI, or is it also accessed with other protocols? Is the LUN provisioned as thick? or thin?
Do you have snapshots enabled for the LUN?
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