On Thu, Oct 16, 2008 at 03:50:19PM +0800, Gray Carper wrote: > > Sidenote: Today we made eight network/iSCSI related tweaks that, in > aggregate, have resulted in dramatic performance improvements (some I > just hadn't gotten around to yet, others suggested by Sun's Mertol > Ozyoney)... > - disabling the Nagle algorithm on the head node > - setting each iSCSI target block size to match the ZFS record size of > 128K > - disabling "thin provisioning" on the iSCSI targets > - enabling jumbo frames everywhere (each switch and NIC) > - raising ddi_msix_alloc_limit to 8 > - raising ip_soft_rings_cnt to 16 > - raising tcp_deferred_acks_max to 16 > - raising tcp_local_dacks_max to 16
Can you tell us which of those changes made the most dramatic improvement? I have a similar situation here, with a 2-TB ZFS pool on a T2000 using Iscsi to a Netapp file server. Is there any way to tell in advance if any of those changes will make a difference? Many of them seem to be server resources. How can I determine their current usage? -- -Gary Mills- -Unix Support- -U of M Academic Computing and Networking- _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
