Re: firefox-37, where to put
On Fri, Apr 03, 2015 at 05:39:32PM -0400, Gene Heskett wrote:
> Usually less than 4 megabytes of free space left at the end of the disk
> with a used 4k per sector disk on the cable, but could be zero for a 512
> byte per sector used disk since there is not normally an alignment
> problem with the old 512 byte per sector formatting. I have 1Tb disks
> that look alike at first glance. The 512 byte per sector pair is
> heavier and a wee bit thicker because it likely has two platters in it,
> while the 4k version pair is a bit lighter and thinner, I presume
> because there is only one platter in those two disks.
>
> The commodity drives I have coming will be, at 2Tb, 4096 bytes per
> sector, and linux must align its writes with a Read-Modify-Write cycle
> updating the whole 4k just to change one byte if things don't start on a
> sector boundary. There's a pretty good speed penalty for doing that. A
> disk that can write at 120+ megs a second when aligned can be turned
> into a 20 megs a second slowpoke. if miss-aligned.
Ahh!, weren't you mentioning performance problems?
There was a recent discussion on the netbsd-users list about 4k disks.
In particular this:
http://mail-index.NetBSD.org/netbsd-users/2015/03/27/msg015986.html
--
"If you're not careful, the newspapers will have you hating the people
who are being oppressed, and loving the people who are doing the
oppressing." --- Malcolm X
Reply to: