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New RN314 / EDA500 Owner concerned about Resync times
Long time ReadyNAS NV+ owner, just recently purchased a RN314 (used) and EDA500. Right now I have 4 x WD40EFRX in each chassis.
Having just received new 4 x WD40EFRX for the EDA500 today, I installed them (have to love the new screwless tray design!) and went about creating a new RAID10 volume, in addition to the existing RAID10 volume on the RN314 - so I will ultimately have two RAID10 volumes.
The volume resync is currently crawling along on the EDA500 - 0.15% complete, remaining time is 2558:50:32.
Did I do something wrong in setup? These were new, shrinkwrapped drives...
Firmware is version 6.6.1
Wed Jun 7 2017 2:38:21 Volume: Volume ReadyNAS500 is resynced. ... Wed May 31 2017 15:57:24 Volume: Resyncing started for Volume ReadyNAS500. It finished. Eventually. The above can serve as a data point for 4 x 4TB drives, RAID 10 configuration, EDA500, on 6.6.1.
Thanks for those who suggested patience!
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If this is normal, can someone let me know?
Overnight, some 12 hours later, and we've made it to 2.97% complete, 639:43:55 left to run...
This is not XRaid - just RAID10 - on firmware 6.6.1
Help!
I wish I could help you, as I just bought my 1st EDA500, but I do not have my drives yet. Can you tell my why you went with RAID10 over RAID5?
I can tell you that it took ~23 hours to to build my RAID5 (XRAID) on my RN316 running FW 6.6.1 with 6x4TB Seagate ST4000DM000 drives.
- Raid 5 can only tolerate one drive failure. If a second drive fails while you are rebuilding your raid5 array, you're toast. It's happened to me. My previous generation Seagates (ST2000DL003) dropped like dominos within days of each other on my readynas NV+.
Lesson learned.If maximizing fault tolerance is the only goal, then RAID-6 is the best option. RAID-10 doesn't handle all combinations of 2-disk failures.
Resync speed on the EDA is likely limited by the eSATA connection between the NAS and the EDA.
I wish the RN31x series had some sort of SSD caching to offset the performance penalty of RAID6 though. How goes the rebuild?
- Appreciate the input, but performance was also a concern.
If the limitation is the eSata link, could I build the volume in the 314 then move all the disks to the EDA500?
CDStoneley wrote:
Appreciate the input, but performance was also a concern.
If the limitation is the eSata link, could I build the volume in the 314 then move all the disks to the EDA500?Unfortunately, you can't destroy the volume while it is re-syncing. And if you just power down and remove the drives from the EDA500, there will be reminents of the EDA array in the configuration, and that could come back to haunt you. (I did have such a phantom, and it caused a big problem with the upgrade to 6.7.3.)
Maybe you can remove a drive from the array and make it crash and that will let you destroy it. Otherwise, you'd need to completely start over with the NAS as well as the EDA500 arrays to do that.
If you were starting fresh, I think there is a way to use the volume export feature to do what you want. But in the long run, the process would likely take at least as long as your current resync. And while you were doing it, you wouldn't have access to anything in the main array because it would be removed,
48 hours in, and I'm at 9.86%.
I'm at a loss. I cant believe this is normal....
I'll try my luck with Support on Monday.
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