4 ms·

Not just cost but density. I'm pulling these numbers out of the air, but suppose you could have a $100 4TB SSD or a $600 24TB HDD some years from now. Many data

by mark-r 9y ago

Not just cost but density. I'm pulling these numbers out of the air, but suppose you could have a $100 4TB SSD or a $600 24TB HDD some years from now. Many datacenters will still prefer the HDD just for the rack space considerations.

dragontamer 9y ago
I'd expect SSDs to be significantly more expensive but higher density actually. My perception of the future is maybe a 20TB SSD for $2000 vs 15TB HDDs for $500.
loeg 9y ago
SSDs are already more dense than HDDs and will likely remain that way. The only remaining barrier is $/GB.
- mark-r 9y ago
  I was all set to doubt you, but then I found this: https://www.micron.com/products/solid-state-storage/product-lines/5100#/ https://www.micron.com/products/solid-state-storage/product-.... My ignorance is showing again.
  - loeg 9y ago
    There's even 15 TB available for sale today in the 2.5" form factor: https://www.cdw.com/shop/products/Samsung-PM1633a-MZILS15THMLS-solid-state-drive-15.36-TB-SAS-12Gb-s/4586754.aspx?pfm=srh https://www.cdw.com/shop/products/Samsung-PM1633a-MZILS15THM... And 60 TB in 3.5": https://arstechnica.com/gadgets/2016/08/seagate-unveils-60tb-ssd-the-worlds-largest-hard-drive/ https://arstechnica.com/gadgets/2016/08/seagate-unveils-60tb... No spinning rust drive comes close.
wang_li 9y ago
Of the currently shipping products SSD has the highest density. Samsung has a 2.5" 15 TB SSD. The closest magnetic storage is 12TB 3.5". Another important factor to remember is that your HDD will give you 200 MB/s of sequential data. If you have a random pattern it's going to drop to 10 MB/s or less. (15K RPM SAS drives can do around 150-170 random IOPS, assume 32 KB per operation and you're looking at 6 MB/s.) SSD will push out 10x+ that rate for random IOPS. A 100 TB HDD sitting behind 200 MB/s is painful but sitting behind 5 MB/s is insane. There's a place for such devices, but it's not serving your OLTP databases or kafka message queues.

by mark-r 9y ago

dragontamer 9y ago

I'd expect SSDs to be significantly more expensive but higher density actually. My perception of the future is maybe a 20TB SSD for $2000 vs 15TB HDDs for $500.

loeg 9y ago

SSDs are already more dense than HDDs and will likely remain that way. The only remaining barrier is $/GB.

mark-r 9y ago
I was all set to doubt you, but then I found this: https://www.micron.com/products/solid-state-storage/product-lines/5100#/ https://www.micron.com/products/solid-state-storage/product-.... My ignorance is showing again.
- loeg 9y ago
  There's even 15 TB available for sale today in the 2.5" form factor: https://www.cdw.com/shop/products/Samsung-PM1633a-MZILS15THMLS-solid-state-drive-15.36-TB-SAS-12Gb-s/4586754.aspx?pfm=srh https://www.cdw.com/shop/products/Samsung-PM1633a-MZILS15THM... And 60 TB in 3.5": https://arstechnica.com/gadgets/2016/08/seagate-unveils-60tb-ssd-the-worlds-largest-hard-drive/ https://arstechnica.com/gadgets/2016/08/seagate-unveils-60tb... No spinning rust drive comes close.

wang_li 9y ago

Of the currently shipping products SSD has the highest density. Samsung has a 2.5" 15 TB SSD. The closest magnetic storage is 12TB 3.5". Another important factor to remember is that your HDD will give you 200 MB/s of sequential data. If you have a random pattern it's going to drop to 10 MB/s or less. (15K RPM SAS drives can do around 150-170 random IOPS, assume 32 KB per operation and you're looking at 6 MB/s.) SSD will push out 10x+ that rate for random IOPS. A 100 TB HDD sitting behind 200 MB/s is painful but sitting behind 5 MB/s is insane. There's a place for such devices, but it's not serving your OLTP databases or kafka message queues.