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Forum Discussion
Limitations of RN51600
Hi all,
Just to start I like to say that I have a four bay NV+ and a Ultra 6. I'm so happy with the units I am looking to get another unit, I'm looking getting the RN51600 this time but, before I pull the trigger I have a couple of questions that I would like answers to just to make sure that I get the right unit.
Questions:
1) Does the RN51600 have any limitation in terms of adding drives? Would I be able to start with 3 4Tb harddrives and then add another 3 at another date and still get the full sized volume? I have seen that on other, older boxes there was that their was a 8Tb limitation on the ability to grow the volume.
2) How does the ED500 work? How does it work with the RN51600? I have searched and I have not found any details on how they work together. Am I correct to assume that the EDA500 connects to the RN51600 via SATA, does it grow the main volume or does it create its own volume? If I have 3 EDA500 connected to the RN51600 would this be one big volume or 4 smaller volumes.
3) Does the EDA500 have any 8Tb limitations? See question 1.
4) Are there any 'brains' in the EDA500? Or, is all the computing power for the RN51600 with 3x EDA500's system actually in the RN51600? I ask this question because if all the computing power for the system is in the RN51600 it would increase the need to have more computing power in the main unit.
5) Would I be able to add a EDA500 unit now, another next year and, another the year after?
Thanks,
Shannon
Just to start I like to say that I have a four bay NV+ and a Ultra 6. I'm so happy with the units I am looking to get another unit, I'm looking getting the RN51600 this time but, before I pull the trigger I have a couple of questions that I would like answers to just to make sure that I get the right unit.
Questions:
1) Does the RN51600 have any limitation in terms of adding drives? Would I be able to start with 3 4Tb harddrives and then add another 3 at another date and still get the full sized volume? I have seen that on other, older boxes there was that their was a 8Tb limitation on the ability to grow the volume.
2) How does the ED500 work? How does it work with the RN51600? I have searched and I have not found any details on how they work together. Am I correct to assume that the EDA500 connects to the RN51600 via SATA, does it grow the main volume or does it create its own volume? If I have 3 EDA500 connected to the RN51600 would this be one big volume or 4 smaller volumes.
3) Does the EDA500 have any 8Tb limitations? See question 1.
4) Are there any 'brains' in the EDA500? Or, is all the computing power for the RN51600 with 3x EDA500's system actually in the RN51600? I ask this question because if all the computing power for the system is in the RN51600 it would increase the need to have more computing power in the main unit.
5) Would I be able to add a EDA500 unit now, another next year and, another the year after?
Thanks,
Shannon
23 Replies
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StephenB wrote: Storage units reported on the Web UI are TiB, not TB (1024*1024*1024*1042 bytes = 1 TiB) StephenB wrote: 17.45 TiB is about 19,186,477,904,691 bytes (17.45*1024*1024*1024*1024)
That would be 19.19 TB (which is just power of 10). Your df command is reporting that also (19T)
So does that mean the units indicator "TB" (terabyte) doesn't match the value that is represented in TiB (tetibyte) for the "Data:" and "Free" fields (see picture below)?
But then the images of the disks with text "SATA 4 TB" do match the terabyte size of the disk. No wonder I get confused :) That would be an improvement point for the UI, I guess.
dsnpevl wrote: StephenB wrote: Storage units reported on the Web UI are TiB, not TB (1024*1024*1024*1042 bytes = 1 TiB) StephenB wrote: 17.45 TiB is about 19,186,477,904,691 bytes (17.45*1024*1024*1024*1024)
That would be 19.19 TB (which is just power of 10). Your df command is reporting that also (19T)
So does that mean the units indicator "TB" (terabyte) doesn't match the value that is represented in TiB (tetibyte) for the "Data:" and "Free" fields (see picture below)?
But then the images of the disks with text "SATA 4 TB" do match the terabyte size of the disk. No wonder I get confused :) That would be an improvement point for the UI, I guess.
Proper labeling would be some improvement.
But the only way to really avoid confusion on TiB/TB would be for all manufacturers (disk vendors, apple, microsoft, NAS vendors ...) to use the same units. This issue has been around for decades, so I don't see it changing any time soon.dsnpevl wrote: StephenB wrote: Storage units reported on the Web UI are TiB, not TB (1024*1024*1024*1042 bytes = 1 TiB).
I always get a bit confused in this TiB vs TB issue. I was just qouting what I see on my screen. There it lists:- data: 1.13 TB
free: 16.32 TBStephenB wrote: Your volume seems to about 800 GB smaller than I'd expect.
1.13 TB + 16.32 TB = 17.45 TB. I rounded it down to 17 TB. Maybe that accounts for the difference?
root@nas-FF-FF-FF:~# df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 4.0G 1.3G 2.1G 38% /
tmpfs 10M 4.0K 10M 1% /dev
/dev/md0 4.0G 1.3G 2.1G 38% /
tmpfs 1.9G 48K 1.9G 1% /dev/shm
tmpfs 1.9G 8.8M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
tmpfs 1.9G 0 1.9G 0% /media
/dev/md127 19T 1.2T 17T 7% /data
/dev/md127 19T 1.2T 17T 7% /home
/dev/md127 19T 1.2T 17T 7% /apps
I thought the Western Digital Re 4 TB [ WDC WD4000FYYZ-01UL1B0 ] wasn't supported by the 516. See https://www.readynas.com/forum/viewtopi ... 2&p=394874
So my question is how hot is your readynas 516 with 6 drives? I'm was about to purchase some of the same Disks until I came upon the above article :cry: Now that you have been using these hdrives in your NAS for some time any pointers or advice / recommendation you ( or anyone else ) can give me will be much appreciated.
I have checked the hd compatibility list and can confirm the above drive is not on the list. The next best drive is the Seagate 4 TB NAS HDD [ ST4000VN000-1H4168 ] is on the HCL.
Thanks in advance.Korky wrote:
I thought the Western Digital Re 4 TB [ WDC WD4000FYYZ-01UL1B0 ] wasn't supported by the 516. See viewtopic.php?t=71082&p=394874
So my question is how hot is your readynas 516 with 6 drives? I'm was about to purchase some of the same Disks until I came upon the above article :cry: Now that you have been using these hdrives in your NAS for some time any pointers or advice / recommendation you ( or anyone else ) can give me will be much appreciated.
I have checked the hd compatibility list and can confirm the above drive is not on the list. The next best drive is the Seagate 4 TB NAS HDD [ ST4000VN000-1H4168 ] is on the HCL.
Thanks in advance.
I've been running these WDC WD4000FYYZ-01ULB0 4TB disks in a RN516 for over a year now. My disks' temperature pretty much hovers around the values depicted below (within a plus/minus 2 degrees range). So this looks to me like normal operation temperatures. This is confirmed on the last page of the specification sheet, where it lists 5-55 degrees C as operating temperatures.
The real variation is in the RPM of the fan. On a cold autumn day like today it's running idle around 835 RPM. On a hot summer's day it might go well over 1400 RPM. To me it seems that these WDC WD4000FYYZ-01ULB0 4TB can be used without problems in RN516. Of course only time will tell if I'm right. It is true that the disks in the middle of the disk stack are always a couple degrees higher in temperature. Eventually, when the disks will get older, those might be the first to go. MTBF is 1.200.000 hours, so I should be good for a couple more years, I hope.
One should pay attention to keep ample room behind the RN516 to allow unobstructed airflow out of the fan. And make sure to occasionly clean out gathered dust behind and below the front panel and the mesh around the drive bays. Monitor your temprature graph in System -> Performance to see the highs and lows of the System and CPU temperatures.
Thanks for sharing. Hopefully Netgear will include them in the HCL at some point.dsnpevl wrote: ...To me it seems that these WDC WD4000FYYZ-01ULB0 4TB can be used without problems in RN516. Of course only time will tell if I'm right. It is true that the disks in the middle of the disk stack are always a couple degrees higher in temperature. Eventually, when the disks will get older, those might be the first to go. MTBF is 1.200.000 hours, so I should be good for a couple more years, I hope...
FYI, my pro-6 also shows some temperature variation by slot. So I think that is normal.StephenB wrote: Thanks for sharing. Hopefully Netgear will include them in the HCL at some point.
FYI, my pro-6 also shows some temperature variation by slot. So I think that is normal.
I agree. Full airflow is possible through the mesh around the sides, top and bottom of the drive bay stack. But there is a lot less space between the drive bays, as can be seen on the image below. So it's only natural that the top and bottom disk are cooled a little bit more that the ones in the middle.
After running 24/7 for a couple of years now, I experienced my first disk problem with a WDC WD4000FYYZ-01ULB0 4TB in slot 3 of RN516. The logs started showing this message a couple of weeks ago:
Detected increasing reallocated sector count: [1234] on disk 3 (Internal) [WDC WD4000FYYZ-01UL1B0, WD-WCC130771614] 34 times in the past 30 days. This condition often indicates an impending failure. Please be prepared to replace this disk to maintain data redundancy.
So I ordered a replacement disk (and another spare disk) of exactly the same make and model: WDC WD4000FYYZ-01ULB0 4TB. Assuming that hot swap was possible and the disk would automatically be rebuild, I took the new disk out of the packaging and immediatly swapped the faulty disk without stopping the RN516. When removing the faulty disk, the volume was indicated as "degraded". When insering the new disk, resync started, but lastet less than 30 seconds, after which the volume showed up as "Rebuild, but still degraded" and depicted with red color in volume display. After reboot, all disks in the volume were marked red and I wasn't able to get it working again. The only option left was to do a Factory reset. Daily backups have been taken from the data, so it should be OK, allthough the work on setting up the apps and web server will be cumbersome. After factory reset and creating the volume again, all disks show up blue with green leds in the volume depiction.
Is there anything I could have done differently, to have the disk swap run smoothly and have the volume automatically rebuild?
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