Date: Fri, 27 Mar 2015 10:48:10 +1030 From: "O'Connor, Daniel" <darius@dons.net.au> To: d@delphij.net Cc: freebsd-hackers@freebsd.org, Wojciech Puchar <wojtek@puchar.net> Subject: Re: Seagate Archive HDD Message-ID: <88DE4F68-B05E-4E4D-8C4A-DED8147172E7@dons.net.au> In-Reply-To: <5514A133.8060409@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>
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> On 27 Mar 2015, at 10:45, Xin Li <delphij@delphij.net> wrote: > On 03/26/15 16:55, O'Connor, Daniel wrote: >>=20 >> The drive has many regions with guard bands so it doesn't have to >> rewrite the entire disk for certain writes (it may have to rewrite >> a whole band though) >=20 > That really depends on whether we can afford to lose the whole band of > (meta)data. I don't think it will lose a whole band, it journals writes, i.e. copies = the band to the journal then writes out the whole thing (modified). > That's is why I am not that optimistic about what we do nowadays, we > would need to revisit the on-disk formats with the new drives and see > if adjustments would be necessary. I agree, but it does look like they have gone to reasonable steps to = make it survive power issues. -- 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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