Edward Ned Harvey wrote:
Today I poked around looking at specs of SSD’s and 7.2krpm SATA hard
disks. I just sampled a bunch of whitepapers on various drives and
averaged the results together. Also, when there wasn’t an
apples-to-apples measurement to compare, I had to calculate, as
evidenced by the IOPS versus avg seek time.
The comparisons were pretty surprising, to me –
Sustainable reads: SSD somewhat faster (avg 199MB/s compared to avg 126
MB/s)
Sustainable writes: SSD equal to SATA (avg 124MB/s compared to avg 126
MB/s)
MTBF: SSD equal to SATA. 1.17 vs 1.20 million hours
Read latency: SSD way faster (0.16ms vs 8.5ms) (which I derived from
6300 IOPS and 8.5ms avg seek time)
Write latency: SSD somewhat slower (12ms vs 8.5ms) (which I derived
from 84 IOPS and 8.5ms avg seek time)
Actually, I’m not sure how fair the MTBF is. Because a SATA drive will
eventually fail just from being powered on, while the life of a SSD is
basically determined by how much you write to it.
That is really interesting, thanks for posting the numbers.
We have been experimenting with ssd's for mysql servers. Though I don't
have hard numbers yet, the performance difference has been night and day
(vs SAS). So far, I am very happy with the performance but I am still
concerned on MTBF. Like you say, it's different than 'regular' drives
and I don't know anyone with personal, long term experience with ssd's.
thanks,
M
--
Michael Sprague
[email protected]
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