2012/7/5 Jordan Uggla <jordan.ug...@gmail.com> > On Thu, Jul 5, 2012 at 5:19 AM, yannubu...@gmail.com > <yannubu...@gmail.com> wrote: > > Dear GRUB devs/helpers, > > > > A) Which are the situations where the --recheck option of grub-install > must > > NOT be used? why grub-install wouldn't systematically probe a device map > by > > default? > > With grub 2.00, it does. > http://www.gnu.org/software/grub/manual/grub.html#Device-map . > > > > > B) Some people recommend to use "grub-install /dev/sdX && grub-install > > --recheck /dev/sdX", do you think it is correct/useful? > > As explained in the above documentation, grub utilities no longer need > a device.map file. Back when they did still need one, the first time > someone ran grub-install it would write a device.map (if one didn't > already exist). If that got out sync somehow then a later grub-install > might fail, and if that happened using the --recheck option (which > would write a new device.map, overwriting the old one) might allow the > installation to succeed. > > Now, grub-install probes on the fly if no device.map exists, and never > creates a device.map file itself, and so "grub-install --recheck ..." > now actually simply deletes the device.map file, causing grub-install > to go back to the default state of probing on the fly. > > Running grub-install twice is redundant, and adding the '--recheck' is > also usually not needed option at this point but won't hurt anything > (except in very specific situations like when you're passing an LVM > logical volume to a virtual machine as if it were a normal disk, in > which case you should know what you're doing and have a backup of your > device.map anyway). > > So the advice is a little silly at this point, but not harmful. > > -- > Jordan Uggla (Jordan_U on irc.freenode.net) >
If I understood well, - we should recommend using --recheck for 1.98<=GRUB<2.00. Advanced users using device.map will know if they don't need --recheck. - using --recheck or not makes no difference for GRUB>=2.00 Am I correct? (is the --recheck option kept in 2.00+ for retro-compatibility?) Thanks a lot Yann
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