Date: Thu, 23 Oct 2014 20:53:06 +0200 From: Harald Schmalzbauer <h.schmalzbauer@omnilan.de> To: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: sa(4) 9.2->10.1, nsa0.0: request ptr 0x803135040 is not on a page boundary; cannot split request Message-ID: <54494E92.5010007@omnilan.de>
next in thread | raw e-mail | index | archive | help
This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig2D651D67AA87269C43222F2C Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hello, I read about the changes in sa(4) regarding large-block-split changes and the transitional 'kern.cam.sa.allow_io_split' workarround. I'm using bacula (7.0.5) and my previous neccessarry multi-blocking adjustmets like "Minimum block size =3D 2097152" obviously didn't work with FreebSD 10.1 anymore. Good news is, they are not needed any more! With the default of 126 blocks (64512) I get 60-140MB/s with btape(8)'s speed test on my LTO4 (HH) drive and another quick test showed that using mbuffer(1) for zfs(8) 'send' isn't needed anymore (| dd of=3D/dev/nsa0 bs=3D64512 seems to max out LTO4 speed). [with FreeBSD 9 t= he transfer rates were some magnitudes lower with these block size settings!= ] Not so good news is, that bacula can't read the tape's label. 'Labeling a tape (with 'label' at bconsole(8) or btape(8)) is successful, and btape(8)'s 'readlabel' partially displays the correct label, but not the very beginning of the label: Volume Label: Id : **error**VerNo =E2=80=A6rest OK While it should read: Volume Label: Id : Bacula 1.0 immortal VerNo : 11 =E2=80=A6 When btape(8) starts to read the label, the _subject's error is reported_= : *nsa0.0: request ptr 0x803135040 is not on a page boundary; cannot split request* The same error show up if I configure bacula to use a fixed block size of kern.cam.sa.0.maxio (131072). Like expected, allowing split (with kern.cam.sa.allow_io_split in loader.conf) works arround that problem. But I'd like to understand why I cannot set kern.cam.sa.0.maxio resp. why btape(8) doesn't work 100% correct although blocksize < sa.0.maxio I don't have enough understanding to check the code myself, if it's a cam/sa(4) issue in FreeBSD or a problem in btape(8) (and also bacula itself, most likely the tool shares the code with bacula's storage deamon= ). Any hints highly appreciated! Thanks, -Harry --------------enig2D651D67AA87269C43222F2C Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) iEYEARECAAYFAlRJTpgACgkQLDqVQ9VXb8hS2gCbBzaY5pEUAV0KeZNsS35E0csp 9ioAnjm5xMdwI9zfy4+6irsBPvL2tGmT =3X8L -----END PGP SIGNATURE----- --------------enig2D651D67AA87269C43222F2C--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?54494E92.5010007>