The NFS client in this case was VMWare ESXi 4.1 release build. What happened is that the file uploader behavior was changed in 4.1 to prevent I/O contention with the VM guests. That means when you go to upload something to the datastore, it only sends chunks of the file instead of streaming it all at once like it did in ESXi 4.0. To end users, something appeared to be broken because file uploads now took 95 seconds instead of 30. Turns out that is by design in 4.1. This is the behavior *only* for the uploader and not for the VM guests. Their I/O is as expected.
I have to say as a side note, the DDRdrive X1s make a day and night difference with VMWare. If you use VMWare via NFS, I highly recommend the X1s as the ZIL. Otherwise the VMWare O_SYNC (Stable = FSYNC) will kill your performance dead. We also tried SSDs as the ZIL which worked ok until they got full, then performance tanked. As I have posted before, SSDs as your ZIL - don't do it! -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
