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11TB (2TB + 2TB + 3TB + 4TB) results in 7.24TB in RAID0??? where does the space go?
Hi,
I just installed a new 4TB disk into my ReadNAS RN104 which already contained a 2 x 2TB + 3TB. When I check the net disk capacity it's 2 x 1.8, 2.4 and the new disk 3.6, total 9...
marcelser wrote:
I played around more with the ReadyNAS calculator more and it turns out that mixed disks in RAID0 mode is not handled by any ReadyNAS in a useful way.
I believe that with the 6.9.3 you can manually create RAID groups using the extra space on the larger disks, and then concatenate them to the existing volume. Though it's not as automated as it might be, you should still be able to do it.
The guide here might help - https://www.netgear.com/images/support/WP_ReadyNAS%20FlexRAID%20Optimization%20Guide_18May17.pdf
I'm Running OS Version 6.9.3
As for the steps I tried 2 different attempts.
1) put in new disk, deleted volume, formatted disks (getting an error on the disk where the os was installed that it cannot be formatted). Then created single RAID0 volume spanning all disks which created 7.26TB volume.
2) I installed just the new 4TB disk started it which caused a firmware reset and os install on the new disk. After initial boot was complete I shutted down, put the other 3 disks back in and powered on. Then completed setup wizard, switched from x-raid to Flex-raid, deleted the initial volume the setup wizard created, formatted the old 3 disks and again created raid0 volume spanning all disks still ending up with a volume size of 7.26TB.
Any ideas?
As for the steps I tried 2 different attempts.
1) put in new disk, deleted volume, formatted disks (getting an error on the disk where the os was installed that it cannot be formatted). Then created single RAID0 volume spanning all disks which created 7.26TB volume.
2) I installed just the new 4TB disk started it which caused a firmware reset and os install on the new disk. After initial boot was complete I shutted down, put the other 3 disks back in and powered on. Then completed setup wizard, switched from x-raid to Flex-raid, deleted the initial volume the setup wizard created, formatted the old 3 disks and again created raid0 volume spanning all disks still ending up with a volume size of 7.26TB.
Any ideas?
Can you send in your logs (see the Sending Logs link in my sig)?
Why not just use X-RAID?
If you're after the performance benefits of a spanned RAID-0 volume I would have suggested getting a more powerful ReadyNAS.
With a spanned RAID-0 volume if a single disk fails all data is lost.
- Hi,
Thanks for the support.
Actually the RN104 is just my backup device. So I sync the contents of my synology to it through rsync weekly. So I don't need performance or reliability, but max. capacity so it matches (equals or exceeds) the size of the synology ds418. But as its now, the device has 2TB more disk space but volume capacity is still less then the synology.
As for X-Raid, I always thought that X-Raid can not span across differently sized disks? Am I mistaken? Will send you the logs once I'm back home- Actually the page here shows exactly my problem. It seems ready as can't handle the differently sized disks well. It also shows 2.76TB unused.
http://rdconfigurator.netgear.com/raid/index.html
So either I have to get other disks or a device which can handle this better I guess
So I guess you don't need the logs anymore right?I played around more with the ReadyNAS calculator more and it turns out that mixed disks in RAID0 mode is not handled by any ReadyNAS in a useful way. Because all the installed disks just use as much space as the smallest disk. So means my setup of "2 x 2TB, 1 x 3TB and 1 x 4TB" effectively is "4 x 2TB" as 2TB is the smallest disk size and 1TB of the 3 TB disk and 2TB of the 4TB disk ist just wasted!
That you can do much better on this shows synology. They don't have such limitations as their calculator shows:
https://www.synology.com/en-global/support/RAID_calculatorAll disks are used to their full extent no matter what size in a RAID0 striped setup.
I don't have think twice but replace the crappy ReadyNAS device with a decent NAS. Actually the RN104 has been my second ReadyNAS device after the NV+ but both have disappointed me after some time (mostly because of disk, size or RAID limitations). Thats why I already replaced my main NAS by a Synology. Seems now I also have to switch the backup NAS to something decent. So my advice is: If you plan on use a striped RAID0 setup with mixed disk sizes, stay away from ReadyNAS unless you want to waste space. This raid mode has a very bad implementation in all of the ReadyNAS devices as it seems.
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