On Tue, Feb 16, 2016 at 8:00 AM, Adam Goryachev <mailinglists@xxxxxxxxxxxxxxxxxxxxxx> wrote: >snip >> >> A major reason as to why the drives are getting replaced. Back in early >> 2012 >> when I setup the machine there was no obvious information that the ERC >> type drives were needed so I just bought vanilla drives. >>> >>> Essentially, your current disks might be fine, but if you don't have the >>> right settings, they could be "failing" regularly putting your data at >>> risk. >>> You should fix any issue here before you attempt to replace your drives. >> >> I now have 2 long term drives which are likely still good and 2 cheap >> drives that >> are quite new but which I don't trust for long term reliability, >> therefore the push >> to change them all. > > > Note, most drives either still support it, or else can be worked around to > avoid the timeout mismatch. You should do this before continue to replace > the drives, as you want to avoid this happening in the middle of replacing > drives. snip >>> >>> I would suggest replacing one at a time. >> >> There is no way to do them one after another copying over all four and >> then >> only needing to shut the box down once or failing that doing the process 2 >> times >> necessitating only 2 shutdowns instead of 4 is there? The external USB box >> does have room for 2 drives at once. > > > Put two blank drives into the USB, replace first one, replace second one > (would suggest second drive as non-matching pair). Shutdown, move two new > drives internal, place two new drives into drive bay, and repeat for the > last two drives. How do I determine exactly which are the matching pairs? Raid 10 means striped and mirrored so I have 2 pairs (AIUI). I'm thinking its sde and sdf as a pair and then sdb and sdc as the other so if that's true then I would start with say sde and sdc for the first set and then do sdf and sdb for the second. > > I would suggest adding a bitmap for at least the time you are doing the > replacements, then if you have a failure on the USB enclosure during the 2nd > or 4th drive, at least the 1st or 3rd will re-sync quickly. Sorry - - - a bitmap - - - not sure what you mean? Thanking you for your assistance. Dee -- 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
