Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Dear interested reader, I'm trying to use DRBD on *CompactFlash* media. This kind of media is extremely slow on write (~0,17 MB/s) and slow (~3.4 MB/s) on read - compared with harddisks. They are formatted with reiserfs - that could explain the extremely slow writing speed I got by using cp from ramdisk and calculating the rate. But anyhow CF is very slow compared with harddisks. I am using drbd 0.7.17 where I adjusted the size of the metadata to 2 MB according to my earlier post http://lists.linbit.com/pipermail/drbd-user/2006-March/004607.html When I start syncing my 128MB flash drives it needs *hours* to finish and not minutes as I expected. I tried protocols A, B and C and I see no difference. I tried to increase the buffers by doing e.g.: drbdsetup /dev/drbd/0 net 195.212.5.7 195.212.5.28 B -c 20 -e 16384 -b 16384 but I saw no difference. On all other settings I am using the standard values. The connection between the machines is only 10Mbit right now for testing purposes but I think that should be enough since the amount of data to be transfered is really small. The ping is below 0.4ms. Has somebody any suggestions with what settings I could play around to increase the speed? I know that DRBD wasn't designed for slow media but I would also try to improve the code - and for sure give my results back to the community - if somebody would point me to a bottleneck in the current algorithm! Warm regards, thank you and a nice weekend! Martin -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20060421/c29a227a/attachment.htm>