Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Lars Täuber schrieb: > 6553600000 bytes (6.6 GB) copied, 25.4397 s, 258 MB/s > md4 72164,00 0,00 288656,00 0 288656 > > The numbers are floating between ~18900 and ~23400. > > Should I really mount the device with a filesystem on it? The last tests were made without a filesystem too. Linear writes to a raw device are different to writes to a filesystem because: - you don't have to update metadata, journal etc., so you can write faster - raw device can not be fragmented, where a filesystem can (heads in your HDD won't jump here and there) Technically speaking, such writes: [==============>.....] sync'ed: 76.4% (242356/1023804)K finish: 0:00:01 speed: 130,240 (130,240) K/sec can be also fragmented as well - some area can be out of sync here, some area there - the head will jump. Also, note that at the same time there can be real writes to that device (i.e., something writes to your /dev/drbdXY device) - it will impact the speed of that sync because those writes have to be synchronized as well; also HDD head will jump more often. It's hard to tell if such difference (258 MB/s dd write speed versus 130 MB/s DRBD sync) can be explained by only those items I mentioned. -- Tomasz Chmielewski http://wpkg.org