Date: Sat, 26 Jul 2008 20:05:46 +0200 From: Peter Schuller <peter.schuller@infidyne.com> To: freebsd-fs@freebsd.org Subject: Asynchronous writing to zvols (ZFS) Message-ID: <200807262005.54235.peter.schuller@infidyne.com>
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--nextPart1701664.oZ5f8Fbn9c Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Hello, I was finally playing around with iSCSI, having never used it before. For=20 convenience, and also because it may be a future use case for real use, I=20 used zvols for my targets. I could not get write speed above roughly 1 MB/second even in simple cases= =20 like dd:ing with an 8 MB block size, with the zvol:s on a 6-disk raidz2. Th= e=20 individual disk utilization of constituent drives remains small (< 3%).=20 Switching to a memory disk target yielded expected performance=20 characteristics. I notice that there were confirmed issues with writes to zvol:s: http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=3D6496356 http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=3D6496344 The problem is that I'm not really sure how to translate "snv_59" into=20 something that I can compare with the version of ZFS in FreeBSD. Do the=20 above "bugs" still apply to the ZFS version in FreeBSD, or am I hitting=20 something else? =2D-=20 / Peter Schuller PGP userID: 0xE9758B7D or 'Peter Schuller <peter.schuller@infidyne.com>' Key retrieval: Send an E-Mail to getpgpkey@scode.org E-Mail: peter.schuller@infidyne.com Web: http://www.scode.org --nextPart1701664.oZ5f8Fbn9c Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (FreeBSD) iEYEABECAAYFAkiLZ4IACgkQDNor2+l1i32XxQCg1XPJYeV1vIMEI3iStSrWIZW3 DcUAoJu4Q632YYqe+ZCyhZx23Znx1hMQ =GNbf -----END PGP SIGNATURE----- --nextPart1701664.oZ5f8Fbn9c--
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