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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[-- Attachment #1 --] Hello, I was finally playing around with iSCSI, having never used it before. For convenience, and also because it may be a future use case for real use, I used zvols for my targets. I could not get write speed above roughly 1 MB/second even in simple cases like dd:ing with an 8 MB block size, with the zvol:s on a 6-disk raidz2. The individual disk utilization of constituent drives remains small (< 3%). Switching to a memory disk target yielded expected performance characteristics. I notice that there were confirmed issues with writes to zvol:s: http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6496356 http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6496344 The problem is that I'm not really sure how to translate "snv_59" into something that I can compare with the version of ZFS in FreeBSD. Do the above "bugs" still apply to the ZFS version in FreeBSD, or am I hitting something else? -- / 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 [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (FreeBSD) iEYEABECAAYFAkiLZ4IACgkQDNor2+l1i32XxQCg1XPJYeV1vIMEI3iStSrWIZW3 DcUAoJu4Q632YYqe+ZCyhZx23Znx1hMQ =GNbf -----END PGP SIGNATURE-----
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