On Thu, 15 Mar 2012, Simone Ricci wrote:
When the LUN is provisioned for the first time, by means of creating a ZVOL, sbdadm create-lu, adding the view etc, I get the expected behaviour: writes to the device on the initiator side (with dd, for example) are producing only writes to the pool's disks (confirmed with "zpool iostat"). When writing to the device again, performance is considerably lower...after investigating a bit, I saw a lot of reads...example:
The reads likely indicate that 4GB of RAM is not nearly enough. If the data can not be cached in RAM, then it needs to be re-read from disk.
Bob -- Bob Friesenhahn [email protected], http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ ------------------------------------------- illumos-discuss Archives: https://www.listbox.com/member/archive/182180/=now RSS Feed: https://www.listbox.com/member/archive/rss/182180/21175430-2e6923be Modify Your Subscription: https://www.listbox.com/member/?member_id=21175430&id_secret=21175430-6a77cda4 Powered by Listbox: http://www.listbox.com
