Digi, I posted most everything on the initial email, but to recap, I'm pretty sure it's a disk issue.
When copying a large file to the raid, using SFTP I see IO read and write times of 30-35MB/s and I see transfer rates of 20MB/s. Keep in mind I'm syncing between two datacenters, Texas to Illinois. When it's syncing, iostat shows read write times of 2MB/s. I even created a ramdisk for an external metadisk and I saw no improvement. If my raid can easily write at 30MB/s why is the DRBD sync capped at 2MB/s? This is a RAID 5, with two logical volumes. Thanks, Dan Lavu -----Original Message----- From: Digimer [mailto:[email protected]] Sent: Monday, February 15, 2010 5:30 PM To: Dan Lavu Cc: [email protected] Subject: Re: [DRBD-user] DRBD - Slow Performance Dan Lavu wrote: > Digi, > > Thanks for advance again, but I've already tried this. I'm still pegged > at 2MB/s. I've exhausted IRC any google searches involving DRBD slow > sync. I'm really contemplating rebuilding the machine with a RAID 10 to > enhance performance but I still do not know if this is going to resolve > the issue, any thoughts about this? Thanks in advance. > > Best Regards, > > Dan Lavu How is performance on the local disk? Have you checked using something like: fdisk -tT /dev/sda? Also, what performance do you get if you write a large file to the array? What I am wondering is; Is the performance limitation a DRBD issue, a disk issue or a sync'er issue. What kind of performance do you get sending a file over the DRBD's network interfaces directly (not writing to the DRBD disk)? Digi _______________________________________________ drbd-user mailing list [email protected] http://lists.linbit.com/mailman/listinfo/drbd-user
