Date: Fri, 3 Jun 2022 16:12:24 -0600 (MDT) From: Dale Scott <dalescott@shaw.ca> To: Steve O'Hara-Smith <steve@sohara.org> Cc: freebsd-questions <freebsd-questions@freebsd.org> Subject: Re: Effect of using SATA 2.x and 3.x in zfs mirrored config Message-ID: <1406347038.59069302.1654294344615.JavaMail.zimbra@shaw.ca> In-Reply-To: <20220602220732.358b6b81b07d35ac608c88b1@sohara.org> References: <1706301853.51806224.1654176891423.JavaMail.zimbra@shaw.ca> <20220602220732.358b6b81b07d35ac608c88b1@sohara.org>
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----- Original Message ----- > From: "Steve O'Hara-Smith" <steve@sohara.org> > To: "Dale Scott (dalescott@shaw)" <dalescott@shaw.ca> > Cc: "freebsd-questions" <freebsd-questions@freebsd.org> > Sent: Thursday, June 2, 2022 3:07:32 PM > Subject: Re: Effect of using SATA 2.x and 3.x in zfs mirrored config > On Thu, 2 Jun 2022 07:34:51 -0600 (MDT) > Dale Scott <dalescott@shaw.ca> wrote: > >> Looking in dmesg, I see one of the drives is using SATA 3 (600MB/s >> transfer), and the other is using SATA 2 (300MB/s transfer). Will mixing >> SATA 2 and SATA 3 drives cause any technical issues? Is there any reason >> why I should use SATA 2 for both drives? > > No reason at all to do so, but it probably wouldn't hurt either, I > doubt the drives can exceed SATA 2 speeds for long if at all. > > ZFS won't know or care what underpins the devices. I've even > mirrored a laptop SSD with an iSCSI accessed zvol on a NAS - it worked fine > (I didn't try disaster recovery, that would take some thinking about) the > main aim was to make a weekly scrub worthwhile. > > -- > Steve O'Hara-Smith <steve@sohara.org> Thanks for vote of confidence in ZFS. Since JBOD works I wasn't expecting trouble, but it was still a surprise to learn the drives were using different protocols. My larger concern was, if there was a reason why using the same protocol was "better", whether moving the SATA cable to a different port would trigger issues with ZFS, and I would need to learn much more about ZFS than I do now. Cheers, Dale
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