3. Volume creation speed is a variable, dependent on the disks used, and the performance of the DiskStation. As an example, using 5xST31000528AS in a DS1010+, firmware 1045, with complete consistency check for me took about 5 hours to build a volume.
Hope this helps.
vm.franklin wrote:almograve wrote:On a scale of 1 to 10 how much would give to having a UPS when using SHR? Knowing that in a year in my appartement I've never experience a shortage that I could notice of.
I would always recommend using a UPS, regardless of what type of RAID you use. For me, spending a couple hundred dollars on a UPS already saved my data from damage loss during a snow storm and the ensuing main power stability errors. Data is more valuable than a couple hundred dollars.
Hi-Jack wrote:In your case use RAID5. SHR is only usefull when using different size disks and remains a software based solution which is responsible for the slightly less performance it offers... In my opinion SHR is only usefull if having different sized hard drives above 1TB (1.0, 1.5 and 2.0TB) as otherwise the investment in a 4-BAY or 5-BAY server is over the top.
So SHR is only good under certain conditions...
Don't use it if you ahve the right conditions to use regular RAID5 or 6...
Alfredo wrote:If I use SHR to create regular RAID-5 arrays (4*1TB for example), will I still experience 10% less performance? Or is that only true for hybrid RAID arrays?
chum wrote:Based on my calculations, using SHR you would have 4.5TB of useable space.
The recommendation is by starting with smaller drives first when using SHR.
1TB = 1TB Basic
1TB + 1.5TB = 1TB RAID1 (500GB wasted)
1TB + 1.5TB + 2TB = 2TB RAID5 + 500GB RAID1 (500GB wasted)
1TB + 1.5TB + 2TB + 2TB = 3TB RAID5 + 1TB RAID5 + 500GB RAID1 (no wastage) total useable space 4.5TB
As far as performance is concerned, a 10-15% performance loss would be incurred when using SHR. Although I have had no experience personally with SHR, I would avoid using SHR on any of the lower end models (j models) unless absolutely necessary.
If you weren't using SHR, you could create a 3TB (useable) RAID5 volume with 2.5TB of wasted space. (this is based on your above mentioned drive sizes 1TB+1.5TB+2TB+2TB)
You could also create 2 volumes without using SHR and have a total useable space of 3TB by creating two RAID1 volumes. Either way when not using SHR and ensuring all of your data has some form of redundancy you can only have 3TB of useable space based on your drive sizes.
If you want to make use of that wasted space, either use SHR from the start and take the performance hit, or sacrifice redundancy and create separate volumes and don't use SHR.
Hope this helps.
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