Date: Thu, 18 Aug 2016 08:42:08 -0700 From: Nathan Whitehorn <nwhitehorn@freebsd.org> To: Allan Jude <allanjude@freebsd.org>, =?UTF-8?Q?Dag-Erling_Sm=c3=b8rgrav?= <des@des.no> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r304142 - head/usr.sbin/bsdinstall/partedit Message-ID: <97b0baf3-94f6-2572-65c8-4cb614448307@freebsd.org> In-Reply-To: <2f9fb04c-7ec4-be40-8fcb-0cf74bb56859@freebsd.org> References: <201608150930.u7F9UL1V069576@repo.freebsd.org> <e3454e8e-5d98-5bec-21de-8ea0db2b9b08@freebsd.org> <861t1n6749.fsf@desk.des.no> <581c856c-826b-529e-c9c6-a397fb679708@freebsd.org> <86wpjf4eun.fsf@desk.des.no> <8cb3fa1a-50cb-e238-d006-b98a628d446d@freebsd.org> <86k2ff4cxs.fsf@desk.des.no> <b96c3f91-faaa-2552-b4da-2d0d382461af@freebsd.org> <86fuq24d8s.fsf@desk.des.no> <2f9fb04c-7ec4-be40-8fcb-0cf74bb56859@freebsd.org>
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On 08/18/16 05:56, Allan Jude wrote: > On 08/18/16 05:50 AM, Dag-Erling Smørgrav wrote: >> Nathan Whitehorn <nwhitehorn@freebsd.org> writes: >>> OK. In which configurations? My Dell servers, for instance, don't do >>> this. How are they set up? What drivers are being used? Is this >>> something that affects passthrough disks, RAIDs, disk images? >> Most LSI MegaRAID controllers don't have real passthrough, only JBOD. >> You can query the drive with "camcontrol identify passX", but the >> controller does not report a stripe size for the volume (mfidY). >> >>> The point is that *if the reported stripe size is wrong*, more things >>> than partition alignment in the installer will suffer for it. >> It's not wrong, it's non-existent, and I'm getting really tired of >> repeating myself. >> >>> Fixing the installer with a bandaid in the run-up to a release is >>> fine, but *we need to fix the underlying problem*. >> We can't, because hardware sucks, and I'm getting really tired of >> repeating myself. >> >> DES >> > Which makes more sense: > > A) If stripesize == 0, use some sane value like 4096 > > B) Some other combination that uses the reported stripe size, unless it > is 0, in which case it uses 4096 (or some other value controlled by a > different new sysctl) > > C) create kern.geom.min_stripe_size with a default of 512, but users can > set 4096 if they use only 4k devices. (doesn't really solve the problem > for the installer) I think "B" does what we want here best, but any of these approaches would work well. -Nathan
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