Ok. I completely wiped my SSD with SECURE ERASE. Here are the numbers:
benchmark: dbench -s2
Code:
Baseline: (disk 75% filled; ~4 months of quite heavy usage)
Unaligned, unqualified 10.3867 MB/sec max_latency=243.054 ms
Unaligned, stripe-width=128 10.2559 MB/sec max_latency=248.230 ms
Aligned, unqualified 11.9774 MB/sec max_latency=233.829 ms
Aligned, stripe-width=128 11.9539 MB/sec max_latency=177.437 ms
Post ATA SECURE ERASE:
Unaligned, unqualified 10.2698 MB/sec max_latency=111.910 ms
Unaligned, stripe-width=128 9.8834 MB/sec max_latency=105.029 ms
Aligned, unqualified 10.9740 MB/sec max_latency=130.026 ms
Aligned, stripe-width=128 11.1741 MB/sec max_latency=94.548 ms
Post ATA ENHANCED SECURE ERASE:
Unaligned, stripe-width=128 27.7824 MB/sec max_latency=79.726 ms
Aligned, stripe-width=128 48.6741 MB/sec max_latency=62.098 ms
Even though I was fed up with benchmarking I ran the last one twice. I just didn’t trust these numbers. I still find them astonishing. But anyway, this took a while. Especially the fumbling with sfdisk and fdisk, etc.
Not TRIM, but there is a very definite improvement. Things like aptitude, make, etc, all that writes small files is much faster now.
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