On Wed, Oct 13, 2010 at 12:24 PM, Arkadiusz Miskiewicz <a.miskiewicz@xxxxxxxxx> wrote: > I have a question on how bitmap works and what's shown in /proc/mdstat, for > example: > > md2 : active raid10 sdc3[0] sdd3[3] sdb3[2] sda3[1] > 60002560 blocks 64K chunks 2 near-copies [4/4] [UUUU] > bitmap: 1/1 pages [4KB], 65536KB chunk > > - 1 bitmap for 4096 chunks > > - if it shows 0/1 pages [0KB] what does it actually mean? If it's 0 pages then no resync. I assume you mean 1/1 ? > Does that mean that > in case of resync it will resync _all_ 4096 chunks in that page or only chunks > that require that (for example 7 chunks) ? It only resyncs what is dirty. A page dirty in the in-memory bitmap does not mean ALL bits are dirty, just that the page is allocated. -- Paul -- 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
