Date: Thu, 26 May 2016 15:02:24 +0100 From: Igor Mozolevsky <igor@hybrid-lab.co.uk> To: "Kenneth D. Merry" <ken@freebsd.org> Cc: Gary Jennejohn <gljennjohn@gmail.com>, current <current@freebsd.org> Subject: Re: Recognizing SMR HDDs Message-ID: <CADWvR2gKxbpPVpt0tm5nhxy9=M8k=ZqxBGBC8e5jEFtjDtqo1g@mail.gmail.com> In-Reply-To: <20160526134120.GA3146@mithlond.kdm.org> References: <20160526084253.6588938f@ernst.home> <20160526123445.GA2105@mithlond.kdm.org> <20160526152921.1c91f61a@ernst.home> <20160526134120.GA3146@mithlond.kdm.org>
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On 26 May 2016 at 14:41, Kenneth D. Merry <ken@freebsd.org> wrote: > On Thu, May 26, 2016 at 15:29:21 +0200, Gary Jennejohn wrote: > > On Thu, 26 May 2016 08:34:45 -0400 > > "Kenneth D. Merry" <ken@FreeBSD.ORG> wrote: > > > > > On Thu, May 26, 2016 at 08:42:53 +0200, Gary Jennejohn wrote: > > > What kind of drive is it? > > > > > > > ST8000AS 0002-1NA17Z 0X03 > [snip] > Yes. There is something slightly odd about the Inquiry data you pasted > above. Seagate didn't set the bits in the ATA identify data to mark it as > a Drive Managed drive, so I put in a quirk entry to mark it as Drive > Managed. > > Unfortunately with Drive Managed drives that is really all you know. You > don't know the zone boundaries or states. But, it is useful to know that > you really should write sequentially for good performance. (True of any > drive, but especially true with SMR drives.) > The drive is supposed to have Word 69 set to 0x0001 and support ZAC MGMT IN/OUT - http://www.seagate.com/www-content/product-content/hdd-fam/seagate-archive-hdd/en-us/docs/100795782a.pdf at pg. 24 and 28. Incidentally AR17 firmware is a new batch, perhaps Seagate did what they did with -DL003 drives where the early models reported 512n sector size (so as not to confuse computers) and the later models properly reported 4kn sector size? -- Igor M.
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