Mailinglist Archive: opensuse (1786 mails)

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Re: [opensuse] Re: SSD in openSUSE.
  • From: Roger Luedecke <roger.luedecke@xxxxxxxxx>
  • Date: Tue, 22 Nov 2011 17:54:30 -0800
  • Message-id: <3615846.xerQRfb5rt@frankensuse>
On Tuesday, November 22, 2011 08:42:10 PM Greg Freemyer wrote:
On Tue, Nov 22, 2011 at 7:44 PM, Joachim Schrod <jschrod@xxxxxxx> wrote:
If you can afford it, don't use 15% of the disk. To get this free
space, use secure erase to reset the disk's firmware notion of what
you're using, and then don't allocate 15% of the disk during

Undocumented feature time. First secure erase is not always
implemented on SSDs, so don't trust it.

Second, modern versions of the mkfs tools take care of discard/trim
for you. ie. They discard/trim all the unallocated parts of the drive
during the format process.

In fact if you don't want that to happen, you have to specify it via:

mkfs.ext4 -E nodiscard /dev/sdxx

I don't know when that was introduced, but os 12.1 has it in the
binary, but not in the man page. I strongly suspect 11.4 is similar.
No idea about 11.3.

Anyway, XFS uses -K for the same thing. (And its in the man page!)

mkfs.xfs -K /dev/sdxx

So if you really want to keep back 15%, I would create a fullsize
partition, format with mkfs, then delete the partition and create one
15% smaller, then format again with mkfs.

What would be a good filesystem catering to SSD strenghts and weaknesses? A
friend of mine swears by XFS.
Roger Luedecke
openSUSE Ambassador
Ind. Repairs and Consulting
**Looking for a C++ etc. mentor***
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