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Originally Posted by gordydawg
But after making changes in liloconf, I now get sector 63 warnings when making changes due to newer sector alignments favored by gdisk and the newer version of fdisk. Oddly, though everything still boots fine.
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That's because you're probably still using the traditional partition alignment, which is based on cylinder, head, sector addresses. The first partition then generally starts at sector number 63.
These days, more and more high-capacity hard disks use hardware sectors of 4096, instead of 512, bytes (even though they continue to use
"logical sectors" of 512 bytes, which means that your computer and Operating System will still count units of 512-byte sectors). Since one hardware sector (i.e., 4096 bytes) then corresponds to 8 logical sectors, you would do better to align partitions on multiples of 8 sectors for optimal performance. The general recommendation, nowadays, is to align partitions on multiples of 1MB, i.e., 2048 (logical) sectors.
The traditional alignment will still work, but will be suboptimal on modern high-capacity disks (hence the warning).
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As for Grub, I'm not familiar with it to grok how to change it post install (seems it resides in many config files) and if it supports chain loading, even to ZFS based Unix's.
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GRUB does support chainloading. The
"many config files" are really just there to control its automatic configuration options. You can still write your GRUB configuration manually, though.
