On 18/04/11 14:55, Hans de Faber wrote:
On 18/04/11 11:50, Joachim Schrod wrote:
Cristian Rodríguez wrote:
El 17/04/11 13:32, Per Jessen escribió:
Hans de Faber wrote:
Now to my opinion,it is desirable that the opensuse partitioner has an ssd option to align partition and filesystem properly on this this type of devices. Is this a good idea and a reasonable expectation ?
It doesnt align SSD partitions automagically, IMHO it should do something like this
http://ldn.linuxfoundation.org/blog-entry/aligning-filesystems-ssd%E2 %80%99s-erase-block-size
Since I'm about to buy a (Thinkpad) laptop with an SSD, thanks for this hint.
Ted Ts'o wrote this in February 2009 -- did any changes happen in SSD technology or Linux kernel in the last 2 years, changes that make a difference for installation / system administration in that area?
Cheers, Joachim
The problem is in theory very simple. An ssd has 512kB eraseblocks. The filesystem writes in 4kB blocks. If the 4kB filesystemblocks cross (overlay) the eraseblock boundary than always 2 blocks of 512kB must be erased. This is unwanted. Therefore the partition should always start on block (512Bytes) 0 8 16 and so on. Next partition should start on position 0 of the first available eraseblock.
In my case I used the opensuse partitioner defaults and created my first partition and copied my OS. It worked fine and very quick. After that I did some study about ssd's and partitioning and saw that my first partition started at block 3, not correct. My story ends with the hdparm command --secure-set-pass NULL From that moment the drive was no longer accessible in native command-mode, even the bios did not see the drive. I switched back to ide mode and saw the drive again in the bios. But open suse won't start with the ssd on the bus. Systemrescue-cd starts but gives immediate after boot when first accessing the device endless loop read-errors . When I disconnect the drive and reconnect, the boot continues but I have no device designation at all (/dev/sda?).
Thats the end of the story, hans
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