Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Wed, Dec 30, 2009 at 11:45:22AM -0700, Josh Aune wrote: > > On Dec 30, 2009, at 3:27 AM, Lars Ellenberg wrote: > > > On Tue, Dec 29, 2009 at 03:56:17PM -0700, Josh Aune wrote: > >> Hi, > >> > >> Attached is a patch for the users guide. > > > > Thanks. > > > >> Also, I'm having an issue with sync performance. I have DRBD setup > >> between two hosts using SRP. > > > > SDP maybe? > > Ya, that one :) > > > > >> Under optimal conditions I'm able to achieve a 500+ MB/s write speed, > > > > How do you measure? > > $ iostat -m 1 > > On both hosts while running a benchmark. On the host with the > benchmark I see 500+ MB/s register on both the drbd1 and fioa devices, > on the remote host it registers 500 MB/s on only the fioa device. > > While running the initial sync both sides register between 50-80 MB/s > reads, no writes. Doing a local benchmark using 4 processes of 32k > reads this device can easily sustain 600+ MB/s. > > >> but during the initial sync after the DRBD device is created the sync > >> proceeds at less than 100 MB/s. Below is the config file. Am I > >> missing anything needed to bump up the initial sync speed? > >> > >> Also, all bytes on the drives on both side are zeros, so the limitation seems to be in the crc32c processing. > > > > Did you look at top, vmstat or similar? > > Yes, 87% cpu idle. Nothing much really happening. Then this seems to be some other config problem. <shameless plug> Did you know we sell "DRBD Health Checks"? http://www.linbit.com/en/products-services/drbd-consulting/ </shameless plug> ;) Cheers, -- : Lars Ellenberg : LINBIT | Your Way to High Availability : DRBD/HA support and consulting http://www.linbit.com DRBD® and LINBIT® are registered trademarks of LINBIT, Austria. __ please don't Cc me, but send to list -- I'm subscribed