Date: Wed, 19 Nov 2014 16:06:51 +0100 From: Mark Martinec <Mark.Martinec+freebsd@ijs.si> To: freebsd-stable@freebsd.org Subject: Re: 10.1 fresh install and 4k alignment Message-ID: <bcb5a31a30af0fee8dd15c1bc37f1ffc@mailbox.ijs.si> In-Reply-To: <1D6C7C39-C8F6-4F5B-AF09-F26B27FA2ED0@punkt.de> References: <A2328132-EC43-4E27-8D01-A4D774634598@punkt.de> <ead753e90b2b74b169af2fb04c525c9e@mailbox.ijs.si> <EB886DA7-5935-41D2-B462-943CA0B30548@punkt.de> <27d8222a2b617ac515c38a0023151320@mailbox.ijs.si> <1D6C7C39-C8F6-4F5B-AF09-F26B27FA2ED0@punkt.de>
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>> Am 19.11.2014 um 15:50 schrieb Mark Martinec
>> <Mark.Martinec+freebsd@ijs.si>:
>>
>> I consider a sensible alignment nowadays to be '-a 1m' for any
>> GPT partition, including freebsd-boot. If one is very short on space
>> and not on an SSD, one may save 0.5 MB by aligning freebsd-boot
>> on -a 512k and everything else on '-a 1m':
Patrick M. Hausen wrote:
> Why the "not on an SSD" condition?
Because an SSD erase block is typically 1 MB in size, and it's not
desirable
to let it shuffle around blocks holding a boot partition when managing
some unrelated space that happens to be in the same 1 MB region.
Mark
Btw:
"The Windows Disk Manager in Windows Vista and Windows 7 utilizes
a new 1 MB partition alignment scheme" [1]
[1]
http://en.wikipedia.org/wiki/Disk_partitioning#DOS.2C_Windows.2C_and_OS.2F2
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