Date: Fri, 27 Mar 2015 14:12:34 +1030 From: "O'Connor, Daniel" <darius@dons.net.au> To: Xin Li <delphij@delphij.net> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>, Adrian Chadd <adrian@freebsd.org>, Xin LI <d@delphij.net>, Wojciech Puchar <wojtek@puchar.net> Subject: Re: Seagate Archive HDD Message-ID: <FE0B3634-61C1-4A75-AB00-110B071A239F@dons.net.au> In-Reply-To: <5514D0A9.1040106@delphij.net> References: <alpine.BSF.2.20.1503261124380.1417@laptop.wojtek.intra> <55148E42.80708@delphij.net> <4F65B315-5FFE-4184-91FD-C05A40E0A26E@dons.net.au> <5514A133.8060409@delphij.net> <88DE4F68-B05E-4E4D-8C4A-DED8147172E7@dons.net.au> <CAJ-VmokEQjDXSHTn7o%2BEDnyrjDxckQkvWgQokKhhY1T1m3t_wA@mail.gmail.com> <5514D0A9.1040106@delphij.net>
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> On 27 Mar 2015, at 14:08, Xin Li <delphij@delphij.net> wrote: > On 3/26/15 17:58, Adrian Chadd wrote: >> ... all the talk about this stuff, and yet noone's talked about >> how ZFS is supposed to be append only, and boy wouldn't that be >> awesome. :) >=20 > It doesn't overwrite existing data with the assumption that a, let's > say, 4K-native drive doesn't have a 1MB "band" when writing. >=20 > I hope the "journal" would be helpful for this assuming it is on > non-volatile medium... The journal for the existing drives appears to be on the actual platter = (but not shingled obviously). This gives from pretty suboptimal write latency as you can probably = imagine.. -- Daniel O'Connor "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
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