Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Trent Lloyd a écrit : > I am in no way surprised by these results. First note that you are > writing out 4K blocks, then forcing a sync. So you can see already > this is a slow operation from the non-DRBD results. As each time you > write 4k you need to wait for it to sync before it can do the next 4k. > > Problem with doing a force sync on DRBD is you introduce network > latency into the 'sync' pipeline.. so it writes 4K.. sends a sync and > you have to wait for that to go over the network, get synced, and come > back, before it can move onto the next 4k block. A simple bonnie++ session would allow to compare "putc()" and "intelligent" writes performance (same with reads). It's not a "real world" benchmark though. Artur, you mentioned drbd fine tuning, but check your hosts network settings too (MTU especially). Florent -- Disclaimer ------------------------------------ Ce message ainsi que les eventuelles pieces jointes constituent une correspondance privee et confidentielle a l'attention exclusive du destinataire designe ci-dessus. Si vous n'etes pas le destinataire du present message ou une personne susceptible de pouvoir le lui delivrer, il vous est signifie que toute divulgation, distribution ou copie de cette transmission est strictement interdite. Si vous avez recu ce message par erreur, nous vous remercions d'en informer l'expediteur par telephone ou de lui retourner le present message, puis d'effacer immediatement ce message de votre systeme. *** This e-mail and any attachments is a confidential correspondence intended only for use of the individual or entity named above. If you are not the intended recipient or the agent responsible for delivering the message to the intended recipient, you are hereby notified that any disclosure, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender by phone or by replying this message, and then delete this message from your system.