Date: Thu, 7 Apr 2011 07:28:11 GMT From: Mickaël Canévet <canevet@embl.fr> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/156241: 'zfs send' does not prevents disks to suspend if no other activity Message-ID: <201104070728.p377SBaJ023484@red.freebsd.org> Resent-Message-ID: <201104070730.p377UAkY041606@freefall.freebsd.org>
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>Number: 156241 >Category: misc >Synopsis: 'zfs send' does not prevents disks to suspend if no other activity >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Thu Apr 07 07:30:10 UTC 2011 >Closed-Date: >Last-Modified: >Originator: Mickaël Canévet >Release: 8.2-RELEASE >Organization: EMBL >Environment: FreeBSD 8.2-RELEASE FreeBSD 8.2-RELEASE #0: Thu Feb 17 02:41:51 UTC 2011 root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64 >Description: I have a backup server with almost no I/O activity on which I want to export a ZPOOL to a USB disk. When I do a 'zfs send my_backup_pool| zfs receive my_usb_backup_pool', the process hangs after a few minutes and dmesg reports this error message: mfi1: COMMAND 0xffffff80004fe268 TIMEOUT AFTER 59 SECONDS mfi1: COMMAND 0xffffff80004fbcb0 TIMEOUT AFTER 59 SECONDS mfi1: COMMAND 0xffffff80004fbcb0 TIMEOUT AFTER 89 SECONDS mfi1: COMMAND 0xffffff80004fbcb0 TIMEOUT AFTER 120 SECONDS .. The problem solves as soon as I do a read on the source. Is it possible that 'zfs send' bypasses some low level layers that prevents disks to suspend ? >How-To-Repeat: If you do this on a server with no I/O activity: zfs send a_big_zpool | cat - > /dev/null after a few minutes, you should have: mfi1: COMMAND 0xffffff80004fe268 TIMEOUT AFTER 59 SECONDS mfi1: COMMAND 0xffffff80004fbcb0 TIMEOUT AFTER 59 SECONDS mfi1: COMMAND 0xffffff80004fbcb0 TIMEOUT AFTER 89 SECONDS mfi1: COMMAND 0xffffff80004fbcb0 TIMEOUT AFTER 120 SECONDS .. And as soon as you do a 'ls' for example on the zpool, 'zfs send' continues. >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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