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From: Bakul Shah <bakul@bitblocks.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] copying fossil filesystem to a bigger disk
Date: Tue,  4 Oct 2011 11:24:45 -0700	[thread overview]
Message-ID: <20111004182445.DC8C5B856@mail.bitblocks.com> (raw)
In-Reply-To: Your message of "Tue, 04 Oct 2011 12:45:58 EDT." <6e6d01007f08aaf2fd598115982645dc@chula.quanstro.net>

On Tue, 04 Oct 2011 12:45:58 EDT erik quanstrom <quanstro@quanstro.net>  wrote:
> > Writing 25000 4k records stepping by 8k takes
> >   sector offset 1-7 mod 8: 27-30 sec
> >   sector offset 0 mod 8:   14-17 sec
> >
> > Conclusion: WD10EARS has 4k byte physical sectors but is pretty
> > good at concealing it.

Weren't there 4k sector disks that mapped the 1st 4k sector to
just the mbr? So the next four 512B sectors got mapped to the
next 4k sector and so on.  As a result your nicely "aligned"
on 4k boundaries IO wouldn't be aligned at all.  Are there
still such disks one should avoid?

> it's amazing how fast you can be if you don't care about losing data
> on power loss.  :-)

it's amazing how simple you life can be if you don't care
about losing data :-) I call it garbage collection! Because
if you really cared you'd have already saved your stuff!
[Cue George Carlin on "stuff"]



  parent reply	other threads:[~2011-10-04 18:24 UTC|newest]

Thread overview: 66+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-24  0:20 slash
2011-09-24  8:07 ` David du Colombier
2011-09-24  8:34   ` Steve Simon
2011-09-29 23:54   ` slash
2011-09-30  8:31     ` Richard Miller
2011-09-30  8:54       ` Richard Miller
2011-09-30  9:44         ` Charles Forsyth
2011-09-30 14:06           ` erik quanstrom
2011-09-30 14:16           ` Ethan Grammatikidis
2011-09-30 14:00         ` erik quanstrom
2011-10-01 10:36           ` slash
     [not found]           ` <CAEaiYYzXCfB2KbnDzBHTXytrfQqGUCepRg5Aj-c14ZoEz5hHaw@mail.gmail.c>
2011-10-01 13:51             ` erik quanstrom
2011-10-01 15:27               ` slash
2011-10-01 16:14             ` erik quanstrom
2011-10-01 16:23               ` erik quanstrom
2011-10-04 11:28                 ` Richard Miller
2011-10-04 11:52                   ` Charles Forsyth
2011-10-04 12:01                     ` Richard Miller
2011-10-04 12:05                       ` erik quanstrom
2011-10-04 12:09                       ` Charles Forsyth
2011-10-04 12:13                         ` Charles Forsyth
2011-10-04 12:19                           ` dexen deVries
2011-10-04 12:27                           ` Richard Miller
     [not found]                       ` <CAOw7k5i3i+w_=pUuFjUCnxH1Tp5U0vh3v7wFUoBddfML9xG+ag@mail.gmail.c>
2011-10-04 12:17                         ` erik quanstrom
2011-10-04 12:30                           ` Charles Forsyth
     [not found]                           ` <CAOw7k5hGWG16a5fTjtXBEBd2-gt=XnhjEJKFNjdPrB46_6=dBg@mail.gmail.c>
2011-10-04 12:34                             ` erik quanstrom
2011-10-04 12:05                   ` erik quanstrom
2011-10-04 12:15                     ` Richard Miller
2011-10-04 12:17                       ` erik quanstrom
2011-10-04 12:17                   ` erik quanstrom
2011-10-04 12:33                     ` Richard Miller
2011-10-04 12:52                       ` dexen deVries
2011-10-04 13:05                         ` dexen deVries
2011-10-04 14:13                       ` erik quanstrom
2011-10-04 15:56                         ` Richard Miller
2011-10-04 16:00                           ` erik quanstrom
2011-10-04 16:42                             ` Richard Miller
2011-10-04 16:45                               ` erik quanstrom
2011-10-04 17:52                                 ` Charles Forsyth
2011-10-04 18:05                                   ` dexen deVries
2011-10-04 18:24                                 ` Bakul Shah [this message]
2011-10-04 18:29                                   ` erik quanstrom
2011-10-03 23:07               ` slash
2011-10-06  7:35                 ` Peter A. Cejchan
2011-10-07 10:49                   ` slash
2011-10-07 11:15                     ` Peter A. Cejchan
2011-10-07 13:03                       ` Steve Simon
2011-10-10 10:32                         ` Peter A. Cejchan
     [not found]                   ` <CAEaiYYya5eq3CoVbbZGqPf91_kMEcbkCQ_8WEL4yakFdenek5g@mail.gmail.c>
2011-10-07 13:17                     ` erik quanstrom
2011-10-10  2:32                       ` slash
     [not found]                       ` <CAEaiYYy36ydHfw=Tg2YC9x9gEW7=MAHF2C6-UVbgr36G-qv=rA@mail.gmail.c>
2011-10-10  3:11                         ` erik quanstrom
2011-10-10 10:15                           ` slash
     [not found]                         ` <d0c02b8a1e36c9329902a1183192d732@chula.quanstro.>
     [not found]                           ` <CAEaiYYxoHLgMZddGZ4gCPvW-GuqwRYzytXgfezoi+vjUgxx9tg@mail.gmail.c>
2011-10-10 13:17                             ` erik quanstrom
2011-10-11  8:51                               ` slash
2011-10-11  8:55                                 ` slash
2011-10-11 15:01                                 ` slash
2011-10-11 15:36                                   ` David du Colombier
2011-10-12 19:24                                     ` slash
2011-10-13  7:07                   ` Peter A. Cejchan
     [not found]               ` <CAEaiYYxsUzf70Ffhd3hzsBZcMb5=2yhfSCv5-nJ+_27wYbJKig@mail.gmail.c>
2011-10-03 23:10                 ` erik quanstrom
2011-10-04  0:02                 ` erik quanstrom
2011-10-04  7:58                   ` dexen deVries
2011-10-04  9:52               ` Richard Miller
2011-10-04  9:34           ` Richard Miller
2011-10-07  7:47       ` [9fans] io patterns erik quanstrom
2011-09-24  8:30 ` [9fans] copying fossil filesystem to a bigger disk Steve Simon

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