Date: Mon, 4 Jul 2016 11:06:34 -0700 From: Jordan Hubbard <jkh@ixsystems.com> To: Ben RUBSON <ben.rubson@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: HAST + ZFS + NFS + CARP Message-ID: <73DC3B93-60FF-4B20-AF80-5712F77818EF@ixsystems.com> In-Reply-To: <E9A65461-CD42-4CBD-9C22-87E1B9D5A4EA@gmail.com> References: <20160630144546.GB99997@mordor.lan> <71b8da1e-acb2-9d4e-5d11-20695aa5274a@internetx.com> <AD42D8FD-D07B-454E-B79D-028C1EC57381@gmail.com> <20160630153747.GB5695@mordor.lan> <63C07474-BDD5-42AA-BF4A-85A0E04D3CC2@gmail.com> <678321AB-A9F7-4890-A8C7-E20DFDC69137@gmail.com> <20160630185701.GD5695@mordor.lan> <FD296976-0250-4DA7-BB56-68F43B62C19B@ixsystems.com> <E9A65461-CD42-4CBD-9C22-87E1B9D5A4EA@gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
> On Jul 1, 2016, at 11:23 AM, Ben RUBSON <ben.rubson@gmail.com> wrote: >=20 > Would you say that giving an iSCSI disk to ZFS hides some details of = the raw disk to ZFS ? Yes, of course. > I though that iSCSI would have been a totally "transparent" layer, = transferring all ZFS requests to the raw disk, giving back the answers, = hiding anything. Not really, no. There are other ways of talking to a disk or SSD = device, such as getting S.M.A.R.T. data to see when/if a drive is = failing. Drives also return checksum errors that may be masked by the = iSCSI target. Finally, there is SCSI-2 and there is SCSI-3 (where = things like persistent reservations are implemented). None of these = things are necessarily implemented by iSCSI. - Jordan
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?73DC3B93-60FF-4B20-AF80-5712F77818EF>