2010/1/12 Jeff Garzik <jeff@xxxxxxxxxx>: > On 01/11/2010 07:25 AM, Akinobu Mita wrote: >> >> The volume directory may have 2^16 (=65536) directories because >> prefix length of object pathname is 4 bytes. But ext3 filesystem can >> only have EXT_LINK_MAX (32000) directories. >> >> This changes the prefix length from 4 bytes to 3 bytes and breaks >> the volume data format compatibility with older version. >> >> Now the maximum count of links in volume directory is 2^12 (=4096) >> and it doesn't exceed ext3's upper limit of max links. >> >> Signed-off-by: Akinobu Mita<akinobu.mita@xxxxxxxxx> >> --- >> server/be-fs.c | 2 +- >> 1 files changed, 1 insertions(+), 1 deletions(-) > > hey, welcome, new contributor! > > This patch makes sense, but it also raises the question of whether or not we > should move to a two-level directory scheme, eg. > > 123/456/7890ABCDEF > rather than > 123/4567890ABCDEF > > to limit the size of the top-level directories. It really depends on the > object counts a typical chunkd node will be seeing. As with the other > patch, I will give this some thought after sleep. Two-level directory scheme looks good. I will do it unless someone thinks 536,870,912,000(=4096*4096*32000) objects in one table is not enough :) -- To unsubscribe from this list: send the line "unsubscribe hail-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
