I plan to build some storage schema but I have to anticipate downtime, maintenance and rebuild Time.
Some guys said to me that a 10 disk RAID6 of 10To (SATA) rebuild will last for about a week ! and some company policy ask for stopping activity on Array when rebuilding.
If I use RAID 5 or 6 or 5+1 or 6+1 is there an approximate formula that can give me hint on rebuild time depending on disk size and type (SAS/SATA/SSD). something like rpm x size(Mb) x type-factor x nb-of-disk ...
I would like to be able to anticipate all rebuild time scenario depending on Size/type of RAID/type of Disk.
I know it may depend on hardware quality, but let says I am out of dedicated hardware like 3PAR / STOREWIZE / NETAPP or likes. I am using conventional servers with traditional SAS or SATA drives with software RAID.