On Mon, Jan 15, 2018 at 12:35:17PM -0500, Felix Miata wrote: > Ancor Gonzalez Sosa composed on 2018-01-15 17:37 (UTC+0100): > ... > > For example, in the case of a typical GPT partition table in a typical > > disk, the REQUIRED grain would be 1B (so we can create a partition of > > any size), but the OPTIMAL grain is 1MiB (so we try to only distribute > > the space in virtual "disk slices" of 1MiB).... > > 1MiB at the front is a convention. How did optimal *grain* get to be so big?
We do the same as parted does here. The target are SSD where the internals are unfortunately hidden (see https://en.wikipedia.org/wiki/Solid-state_drive#Partition_alignment, also linked from libstorage-ng documentation): "A typical practice for personal computers is to have each partition aligned to start at a 1 MB (= 1,048,576 bytes) mark, which covers all common SSD page and block size scenarios, as it is divisible by all commonly used sizes - 1 MB, 512 KB, 128 KB, 4 KB, and 512 bytes. Modern operating system installation software and disk tools handle this automatically." ciao Arvin -- Arvin Schnell, <[email protected]> Senior Software Engineer, Research & Development SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg) Maxfeldstraße 5 90409 Nürnberg Germany -- To unsubscribe, e-mail: [email protected] To contact the owner, e-mail: [email protected]
