Date: Tue, 3 Oct 2017 08:22:06 +0200 From: Ben RUBSON <ben.rubson@gmail.com> To: Andriy Gapon <avg@FreeBSD.org> Cc: Steven Hartland <smh@FreeBSD.org>, Freebsd fs <freebsd-fs@FreeBSD.org>, FreeBSD-scsi <freebsd-scsi@freebsd.org> Subject: Re: ZFS stalled after some mirror disks were lost Message-ID: <E01AB23B-827A-47DD-B4AB-36E3D00AB7C7@gmail.com> In-Reply-To: <feff135a-3175-c5d0-eeb4-5639bb76789e@FreeBSD.org> References: <4A0E9EB8-57EA-4E76-9D7E-3E344B2037D2@gmail.com> <feff135a-3175-c5d0-eeb4-5639bb76789e@FreeBSD.org>
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> On 03 Oct 2017, at 08:12, Andriy Gapon <avg@FreeBSD.org> wrote: >=20 > On 02/10/2017 21:12, Ben RUBSON wrote: >> A sustained read throughput of 180 MB/s, 45 MB/s on each iscsi disk >> according to "zpool iostat", nothing on local disks (strange but I >> noticed that IOs always prefer iscsi disks to local disks). >=20 > Are your local disks SSD or HDD? HDD. > Could it be that iSCSI disks appear to be faster than the local disks = to the > smart ZFS mirror code? Or because their /dev/da<number> are greater then the local ones ? (as they are attached after the local disks) (my 2 cents...) For sure we could have expected the local disks to be preferred, or at least the load to be spread among all (local & iscsi) disks. > Steve, what do you think?
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