Date: Wed, 3 Jul 2013 17:12:17 +0200 From: mxb <mxb@alumni.chalmers.se> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-fs@freebsd.org Subject: Re: Slow resilvering with mirrored ZIL Message-ID: <CBCA1716-A3EC-4E3B-AE0A-3C8028F6AACF@alumni.chalmers.se> In-Reply-To: <E5CCC8F551CA4627A3C7376AD63A83CC@multiplay.co.uk> References: <CABBFC07-68C2-4F43-9AFC-920D8C34282E@unixconn.com> <51D42107.1050107@digsys.bg> <2EF46A8C-6908-4160-BF99-EC610B3EA771@alumni.chalmers.se> <51D437E2.4060101@digsys.bg> <E5CCC8F551CA4627A3C7376AD63A83CC@multiplay.co.uk>
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Not sure if new are 4k. Done nothing about that. But the SECOND drive, resilvering is SLOW. Not the first one. As stated below. Those changes are introduced to the system. ALL new driver ARE identical, except S/N of cause :) On 3 jul 2013, at 16:55, Steven Hartland <killing@multiplay.co.uk> = wrote: >=20 > ----- Original Message ----- From: "Daniel Kalchev" <daniel@digsys.bg> > To: "mxb" <mxb@alumni.chalmers.se> > Cc: <freebsd-fs@freebsd.org> > Sent: Wednesday, July 03, 2013 3:40 PM > Subject: Re: Slow resilvering with mirrored ZIL >=20 >=20 >> On 03.07.13 16:36, mxb wrote: >>> Well, then my question persists - why I get so significant drop of = speed while resilvering second drive. >>> The only changes to the system are: >>>=20 >>> 1. Second partition for ZIL to create a mirror >>> 2. New disks are 7200rpm. old ones are 5400rpm. >>>=20 >=20 > Its not something like the old disks are 512byte sectors > where as the new ones are 4k? >=20 > It this is the case having already replaced one disk you've > killed performance as its having to do lots more work reading > none 4k aligned data? >=20 > Regards > steve >=20 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > This e.mail is private and confidential between Multiplay (UK) Ltd. = and the person or entity to whom it is addressed. In the event of = misdirection, the recipient is prohibited from using, copying, printing = or otherwise disseminating it or any information contained in it.=20 > In the event of misdirection, illegible or incomplete transmission = please telephone +44 845 868 1337 > or return the E.mail to postmaster@multiplay.co.uk. >=20
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