08-02-2018, 02:28 PM
I have already searched the forum for RAID. If I missed something pertinent my questions, please let me know.
I do not know whether the following data are correct; regardless, I am more concerned with outliers of failure. I include these details for general information.
eMMC lifespan - https://electronics.stackexchange.com/qu...mc-is-dead - "The optimistic estimation would be based on the assumption that your system accumulates data until it can fill one complete erase block, then writes all the data in one go. In that case, your eMMC will live 4'000'000 * 3'000 / (4*20) = 150'000'000 seconds That's about 4.75 years."
microSD lifespan - https://superuser.com/questions/17350/wh...an-sd-card - "My experience with FLASH is integrity begins to falter in as little as 5 years."
1a. Can I compose a RAID1 using eMMC and microSD?
1b. How may I set the boot priority? - https://forum.armbian.com/topic/4583-rock64/ tells me how to disable, but I do not necessarily want to do so.
2. What is the performance of eMMC? (I gather that the microSD will operate at ~23MB/s, and will set the rate determining step for RAID.) The closest answer I found to my question seems to be only theoretical - https://forum.pine64.org/showthread.php?tid=4881
And, if applicable
3. How may I use /usr/local/sbin/resize_rootfs.sh on the RAID? Must I disassemble it to do one element at a time?
4. How may I use an/the store's USB adapter(s) to repeat the entire RAID1 installation (including my subsequent addition and configuration of servers)?
I do not know whether the following data are correct; regardless, I am more concerned with outliers of failure. I include these details for general information.
eMMC lifespan - https://electronics.stackexchange.com/qu...mc-is-dead - "The optimistic estimation would be based on the assumption that your system accumulates data until it can fill one complete erase block, then writes all the data in one go. In that case, your eMMC will live 4'000'000 * 3'000 / (4*20) = 150'000'000 seconds That's about 4.75 years."
microSD lifespan - https://superuser.com/questions/17350/wh...an-sd-card - "My experience with FLASH is integrity begins to falter in as little as 5 years."
1a. Can I compose a RAID1 using eMMC and microSD?
1b. How may I set the boot priority? - https://forum.armbian.com/topic/4583-rock64/ tells me how to disable, but I do not necessarily want to do so.
2. What is the performance of eMMC? (I gather that the microSD will operate at ~23MB/s, and will set the rate determining step for RAID.) The closest answer I found to my question seems to be only theoretical - https://forum.pine64.org/showthread.php?tid=4881
And, if applicable
3. How may I use /usr/local/sbin/resize_rootfs.sh on the RAID? Must I disassemble it to do one element at a time?
4. How may I use an/the store's USB adapter(s) to repeat the entire RAID1 installation (including my subsequent addition and configuration of servers)?