Date: Tue, 5 Oct 2021 15:41:55 -0400 From: Alexander Motin <mav@FreeBSD.org> To: Alan Somers <asomers@freebsd.org> Cc: src-committers <src-committers@freebsd.org>, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org Subject: Re: git: 730ea72c706e - main - cam(4): Limit search for disks in SES enclosure by single bus Message-ID: <d5d8897f-5aaf-5cba-9c87-5a6977c1208e@FreeBSD.org> In-Reply-To: <CAOtMX2g5sMjFWwbJoLtxQrV3ZyBbfHCK5e5WSfeEffufwxd_3g@mail.gmail.com> References: <202110051904.195J48iO062191@gitrepo.freebsd.org> <CAOtMX2g5sMjFWwbJoLtxQrV3ZyBbfHCK5e5WSfeEffufwxd_3g@mail.gmail.com>
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On 05.10.2021 15:14, Alan Somers wrote: > On Tue, Oct 5, 2021 at 1:04 PM Alexander Motin <mav@freebsd.org> wrote: >> >> The branch main has been updated by mav: >> >> URL: https://cgit.FreeBSD.org/src/commit/?id=730ea72c706ef8e025616772cfd86fd89ed3d42e >> >> commit 730ea72c706ef8e025616772cfd86fd89ed3d42e >> Author: Alexander Motin <mav@FreeBSD.org> >> AuthorDate: 2021-10-05 19:01:16 +0000 >> Commit: Alexander Motin <mav@FreeBSD.org> >> CommitDate: 2021-10-05 19:01:16 +0000 >> >> cam(4): Limit search for disks in SES enclosure by single bus >> >> At least for SAS that we only support now disks are typically >> connected to the same bus as the enclosure. Limiting the search >> scope makes it much faster on systems with multiple buses and >> thousands of disks. >> >> Reviewed by: imp >> MFC after: 2 weeks >> Sponsored by: iXsystems, Inc. >> Differential Revision: https://reviews.freebsd.org/D32305 >> --- >> sys/cam/scsi/scsi_enc_ses.c | 8 ++++++++ >> 1 file changed, 8 insertions(+) >> >> diff --git a/sys/cam/scsi/scsi_enc_ses.c b/sys/cam/scsi/scsi_enc_ses.c > > > Sounds juicy. Do you have any benchmarks? I don't think we've benchmarked that system with payload yet, if that is what you mean, polishing usability. But I don't think there can be too much interesting, since big speeds don't require so many HDDs these days, but much smaller number of SSDs instead. This particular system is about capacity -- ~20PiB raw on 1248 disks in one ZFS pool. :) -- Alexander Motin
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