On Thu, Aug 18, 2016 at 6:56 AM, Allan Jude <allanj...@freebsd.org> wrote: > On 08/18/16 05:50 AM, Dag-Erling Smørgrav wrote: >> Nathan Whitehorn <nwhiteh...@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
I don't like this. > 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) Don't like this so much. > 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) Default it to 4k, and allow users to set it to 512. If the drive reports < this value report this value instead. You'll need to make this a tunable. Then the upper layers wouldn't care. There's a small chance that some SD cards might be reporting values that are too large. But I think it is confined to SD cards and if I see too many more I'll do something specific in the SD driver. Warner _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
