Date: Wed, 08 Jul 2015 17:54:10 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: freebsd-fs@freebsd.org Subject: Re: Speeding up resilvering Message-ID: <559D55B2.3010607@infracaninophile.co.uk> In-Reply-To: <559D51B5.3050709@denninger.net> References: <559D2AB6.5070007@FreeBSD.org> <559D2C7C.6060201@denninger.net> <559D3167.1000705@infracaninophile.co.uk> <559D3236.1060102@denninger.net> <559D3380.8050703@sentex.net> <559D4DD3.10903@infracaninophile.co.uk> <559D51B5.3050709@denninger.net>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --9dcXhIptaMNTSJ1xpS9EbFKokD1psgkg6 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 07/08/15 17:37, Karl Denninger wrote: > Be aware that when a resilver /starts /it does a number of very small > and diverse I/O operations. Throughput during that time _*stinks*_, an= d > as a result in the first few minutes to half-hour or so (with a very > large vdev) you will see utterly ridiculous projections of completion t= ime. >=20 > Once that part of the process completes (usually within a few minutes o= n > modest to moderate size vdevs, but it will be longer on very large ones= ) > the performance level of the resilver will go up a lot and the projecte= d > completion time will become far more reasonable. Yeah. This resilver has been running for over a day already, and it is refusing to project what the finishing time will be, mostly because I had to yank it out of the DC in order to substitute another machine to do what this one should have been doing. (So it spent a night powered down in he middle of the resilver operation.) The VDEV is about 20TB which I suppose is pretty big, but possibly not what some ZFS practicioners would call "very large..." 6 x 4TB drives in a RAIDZ Cheers, Matthew --9dcXhIptaMNTSJ1xpS9EbFKokD1psgkg6 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIcBAEBCgAGBQJVnVWyAAoJEABRPxDgqeTnn98QALaFPeYM3UAqDvgmNmDGVvcc XFfxcVZ55TQvxnNeG6za2qkcWwgnnRUyjPPq+F89bKsnTcng0BujoYBIbZ6HIGum GjOh5i6k/yZ+AEvuFd0BnXP9LwoEnXXhKJp+bCGrCmfHOPoettRZr+meYNpv+2eJ YbKmXrYpyEziuSLz8yU48rxXjlsQqUxFKscciKM/1J1vFx7UEkpI9bHY5DYgzGsc g2dxXhizlWtShVvB+TjJKD+NdGvKI9xPd6Hkr/d3cspm9nEg6yF2qLm7OToxzgoi Dsc4Awr6kfrGp2QFS7rP4EH29CQWiRoXoP8Qyk5nrVhUzz6N36T61CMLu84VI54J KeQohL7rkZwgEx2vswl+qrs/HCIHrJAKMc8Gw3SOm7itSw+JbWvX3pWShYEcc50p ivnmFHn+B1OLI4gK+Wg314qDH4KNGBaJqTyKMWKqdxc6Tp/gFrrh71qFau/v74av zV37fZXcN1QfYqqyrhibO9xkMeXV37sPabrgELoOkUpZmiIbpWCAQ5X9J+zSoZPJ bNGbBYswPunZGGAl8OP+lObubc9yry9OV06tGrjnzCqnIqhACqvyk7rSEJBqFdgd 1A1hf79Hb0YCWCNbrTMsKUXduyPJIrdU2qqCorLo9DaG+X3DFwjev9UOehxJwWvU 3WEJL6rrDXbvB99RwQFo =0Wk2 -----END PGP SIGNATURE----- --9dcXhIptaMNTSJ1xpS9EbFKokD1psgkg6--
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