Date: Fri, 19 Jun 2015 10:37:38 -0500 (CDT) From: "Valeri Galtsev" <galtsev@kicp.uchicago.edu> To: "Michael B. Eichorn" <ike@michaeleichorn.com> Cc: "Da Rock" <freebsd-questions@herveybayaustralia.com.au>, freebsd-questions@freebsd.org Subject: Re: ZFS passdevgonecb Message-ID: <44429.128.135.70.2.1434728258.squirrel@cosmo.uchicago.edu> In-Reply-To: <1434726141.6154.34.camel@michaeleichorn.com> References: <557F90DB.80601@herveybayaustralia.com.au> <mlshi7$3of$1@ger.gmane.org> <5583D5BE.7050508@herveybayaustralia.com.au> <1434726141.6154.34.camel@michaeleichorn.com>
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On Fri, June 19, 2015 10:02 am, Michael B. Eichorn wrote: > > On Fri, 2015-06-19 at 18:41 +1000, Da Rock wrote: >> Ok, top posting as a summary really - numerous threads of thought going >> on now. <snip> > There are a few levels of drives these days. There are the enterprise > grade > drives that can take a bit more heat and have a longer mean time to > failure. > These drive have tighter manufacturing tolerances and cost lots more. Then > there > are NAS/RAID consumer drives that are made to about the same tolerances as > a > desktop drive but have a few modifications for a 24/7 workload. Typical > desktop > drives are not actually designed for 24/7 operation. > > Then there is the firmware, some drives designed for 'green-ness' try to > spin > down and do other things to save power, with a typical Windows desktop > this is > probably good. However zfs (and most raids) expect the drive to do > nothing > without being told since zfs knows more than any firmware could. > > Frankly for most small-business and home loads WD Red Drives + zfs is > enough for > servers. I don't even put spinning rust in desktops anymore SSD + a > network > drive is enough for non-workstation tasks. > I would endorse all you said about drives. I will just mention the "consumer" grade drives I happily use in RAIDs that proven to be very reliable: Hitachi (these days HGST) SATA 7200 rpm. (And as it was already mentioned, stay away from "green" "spin-down" and low 5400 rpm 3.5 inch drives). Just my $0.02. Valeri <snip> ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++
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