no this not work very fast... use bcache or other similar ssd+harddisk cache solution (facebook have one solution i don´t remember the name) mixing ssd and hdd are a big problem, since write speed is the slowest (maybe ssd maybe hdd) and read speed isn´t very well since read in ssd can be non sequencial and at hdd sequencial is prefered, the read balance algorithm is tuned to use the near position device, and sometimes ssd isn´t used, or less used or more used... a bigger speed can be done using a cache solution (ssd+hdd or ssd+raid1(hdd)) that was my test results... maybe someone have others results 2011/7/19 Mike Power <mpower@xxxxxxxxxxxx>: > Is it possible to implement a RAID 1 array using two equal size HDD and one > smaller and faster SSD. The idea being that the resulting RAID would have > the same size of the HDD while picking up the speed benefits of the SSD. > You can do something similar today by just buying two hybrid drives and > putting them in an array. By purchasing a dedicated SSD drive for that > purpose you gain the ability of controlling the size of the SSD portion. I > was hoping the RAID array could use the SSD more as a cache then a redundant > storage. > > Mike Power > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- Roberto Spadim Spadim Technology / SPAEmpresarial -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
