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Is my SSD aligned properly? - Page 2

post #11 of 13
So you cannot choose the Linux partition in the drop down list for your M4 in AS SSD? I'm not saying that you should be able to, your comment about the EXT4 partition not being recognized is likely correct. But that is what the others were suggesting you try to do, select the EXT4 partition and see how the alignment is judged.

If the two partitions within that sector have alignments that meet the alignment requirements, then you should be fine.

Write performance suffers with misaligned partitions. The main problem is it happens on every write being done. Read performance is not affected by this, supposedly.

The SSD will write to a misaligned address, but in a weird way that requires two writes, with the SSD page alignment correct, but the offset within the first page being off. Actually that is one example, it depends on the firmware of the SSD for exactly what it does to "correct" a request to write to a non-word aligned address. That is really all the alignment needs to be, aligned to a 64 bit word address.
post #12 of 13
Thread Starter 
Quote:
Originally Posted by parsec View Post

So you cannot choose the Linux partition in the drop down list for your M4 in AS SSD? I'm not saying that you should be able to, your comment about the EXT4 partition not being recognized is likely correct. But that is what the others were suggesting you try to do, select the EXT4 partition and see how the alignment is judged.

If the two partitions within that sector have alignments that meet the alignment requirements, then you should be fine.

Write performance suffers with misaligned partitions. The main problem is it happens on every write being done. Read performance is not affected by this, supposedly.

The SSD will write to a misaligned address, but in a weird way that requires two writes, with the SSD page alignment correct, but the offset within the first page being off. Actually that is one example, it depends on the firmware of the SSD for exactly what it does to "correct" a request to write to a non-word aligned address. That is really all the alignment needs to be, aligned to a 64 bit word address.

The benchmarking tool that was recommended doesn't display any of the EXT4 partitions. I ended up just redoing my partitions for Linux, I wanted to separate my root and home directory's anyway and figured it would be quicker than trying to figure out if they were aligned properly or not.
post #13 of 13
Yes, I thought AS SSD would not see that partition. You were probably Ok before the new configuration, but if you feel better about the new one, that's good.
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