Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
>> man fsync >> man fdatasync >> man sync >> >> wikipedia page_cache >> >> > Yes I understand that the page cache can speed things up a lot. But how > is it possible that when I copy a new file to the DRBD disk the copying > is much faster than the DRBD link of 100MB/second. To be clear, with > 'new' file I mean a file that I have never used on the DRBD disk before. > So it can not be in the cache of the secondary server. Therefore the > copying should go with a rate of 100MB/second, not faster like it does > now. Or am I missing something here? > > Mark Oh well I understand the point now. Some operations on the master are only performed on the page cache, and DRBD is informed later. Is it possible to turn of the page cache for the DRBD device? My RAID controllers have their own (battery back-upped) cache, so I'd rather not use the page cache. Mark