Date: Thu, 31 Dec 2009 17:12:17 +0100 From: Pieter de Goeje <pieter@degoeje.nl> To: freebsd-current@freebsd.org Cc: Alexander Motin <mav@freebsd.org>, Miroslav Lachman <000.fbsd@quip.cz>, Thomas Backman <serenity@exscape.org>, freebsd-arch@freebsd.org Subject: Re: File system blocks alignment Message-ID: <200912311712.18347.pieter@degoeje.nl> In-Reply-To: <200912281741.27179.pieter@degoeje.nl> References: <4B349ABF.2070800@FreeBSD.org> <4B38A4DE.2040507@FreeBSD.org> <200912281741.27179.pieter@degoeje.nl>
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On Monday 28 December 2009 17:41:26 Pieter de Goeje wrote: > On Monday 28 December 2009 13:30:22 Alexander Motin wrote: > > Miroslav Lachman wrote: > > > Alexander Motin wrote: > > >> Thomas Backman wrote: > > >>> On Dec 25, 2009, at 11:58 AM, Alexander Motin wrote: > > >> |>> Recently WD released first series of ATA disks with increased > > >> > > >> physical > > >> > > >>>> sector size. It makes writes not matching with 4K blocks inefficie= nt > > >>>> there. > > >>> > > >>> They don't expose this to the OS, though (not by default, anyway), > > >>> but chop it up into 8 512-byte sectors for compatibility reasons. > > >>> Just thought I'd point that out - I'm not even sure if you can get > > >>> them to *not* do the compatibility thing and expose 4k-sized sector= s. > > >> > > >> Latest ATA-8 specification allows drive to report both logical (512B) > > >> and physical (4KB) sector sizes. ada driver able to fetch and report > > >> that info to GEOM. If these drives not reporting it yet (are you > > >> really sure?), it is only question of their firmware. > > > > > > There is an article about 4k sectors > > > http://www.anandtech.com/storage/showdoc.aspx?i=3D3691 > > > > > > It is completely hidden to OS in first versions. > > > > Thanks for the link, but all I see there is "but at this point there=92s > > no such tool". IMHO it doesn't meet it is not reported. > > > > We just need somebody with that drive to run on it `camcontrol identify` > > from the fresh system and report what he sees. > > I've just ordered one of these disks. I expect it to arrive in a couple of > days. Will let you know what it says when I have it :) Ok, as Miroslav wrote, it does not report 4k sectors: # camcontrol identify ada0 pass0: <WDC WD10EARS-00Y5B1 80.00A80> ATA-8 SATA 2.x device pass0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO size 8192bytes) protocol ATA/ATAPI-8 SATA 2.x device model WDC WD10EARS-00Y5B1 firmware revision 80.00A80 serial number WD-WCAV55072095 WWN 50014ee2ae6664fd cylinders 16383 heads 16 sectors/track 63 sector size logical 512, physical 512, offset 0 LBA supported 268435455 sectors LBA48 supported 1953525168 sectors PIO supported PIO4 DMA supported WDMA2 UDMA6 overlap not supported =46eature Support Enable Value Vendor read ahead yes yes write cache yes yes flush cache yes yes Native Command Queuing (NCQ) yes 31/0x1F Tagged Command Queuing (TCQ) no no 31/0x1F SMART yes yes microcode download yes yes security yes no power management yes yes advanced power management no no 0/0x00 automatic acoustic management yes no 254/0xFE 128/0x80 media status notification no no power-up in Standby yes no write-read-verify no no 0/0x0 unload no no free-fall no no According to the anandtech article, this is because Windows XP does not wor= k=20 with sectorsize !=3D 512 bytes. =2D Pieter
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