Agreed, I do a fair bit of testing (nothing permanent) by putting zpools on zvols. I have never experienced a hang or panic due to zpools on zvols. This is a POLA violation.
Regarding zfs hangs, I only experience them with zpool vdevs on USB devices on my laptop when I forget to zpool export tpool prior to laptop shutdown/reboot. This is acceptable as I'm in front of it. Sent from my cellphone, ~Cy -----Original Message----- From: Shawn Webb Sent: 19/01/2016 10:07 To: Alan Somers Cc: Kurt Lidl; svn-src-head@freebsd.org; svn-src-...@freebsd.org; src-committ...@freebsd.org Subject: Re: svn commit: r294329 - inhead/sys/cddl/contrib/opensolaris/uts/common/fs/zfs: . sys On Tue, Jan 19, 2016 at 10:20:38AM -0700, Alan Somers wrote: > On Tue, Jan 19, 2016 at 10:08 AM, Kurt Lidl <l...@pix.net> wrote: > > Removing the ability to run different zpools on top of a zvol is > > a significant reduction in functionality of the entire system, and a huge > > violation of the POLA. > > The thing is, it never really worked in the first place. Panics and > deadlocks are so frequent that I don't think the feature was usable > for anybody. I actively use this every day and will be making even more use of it in the very near future. I haven't had a single kernel panic. I have had deadlocks at shutdown, but since it's a laptop and I'm sitting right in front of it, it's not a big deal. I'd say fix the underlying problem, don't prevent people from getting work done. > > > > > At the very least, can you not add a sysctl that allows the > > dangerous behavior (even if it defaults to off)? Myself > > and certainly others rely on having being able to use a zpool > > installed into a zvol for hosting bhyve virtual machines. > > Your use case should be unaffected. The guest has a different ZFS > instance than the host, so it should work just fine. Please let me > know if you have problems. -- Shawn Webb HardenedBSD GPG Key ID: 0x6A84658F52456EEE GPG Key Fingerprint: 2ABA B6BD EF6A F486 BE89 3D9E 6A84 658F 5245 6EEE _______________________________________________ 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"
