On 2016-02-01 22:13, andrew fabbro wrote:
On Mon, Feb 1, 2016 at 8:16 AM, patric conant
<[email protected]>
wrote:
Why can't the solution be all flash? $400 for 1 TB flash, * 7 sata
ports on
a decent $100 Motherboard, gets you 7TB of flash for under $3000
Well, yes, and for a few hundred thousand you can get persistent DRAM
fusion-io.
OTOH, you can get 4TB SATA drives for $250.
The OP was just pointing out that SSD-acceleted (aka SSD-cached)
SATA/SAS
is very common in Win/Lin/OSX and was wondering what the status is on
OpenBSD.
My purpose with asking for SSD-accelerated HDD was DOUBLE:
1) I need some SSD storage but don't like that it could break together
- I mean, a bug in your system will feed your SSD at full bandwidth for
~7h-7 days, it's completely fried - that's not OK, so putting a
"redundance layer" in the from of an underlying magnet storage layer is
really justified.
2) I need some bulk storage, and I want the terabytes to be really
cheap so that i NEVER will run out of archival space. An 8TB magnet HDD
costs in the range USD 500.
Here, I like it to be stored "symmetrically" with how I store the
other stuff, that is having separate disks, directories, mount points
etc. for the two doesn't really appeal to me in this particular case -
Simply knowing that the less frequently accessed data will be taken
from magnet and the more frequently accessed data from SSD seems both
convenient and practical for my usecase, and, I'll try to have SSD
volume to cover for *MORE THAN ALL* of my frequently stored data.
Perhaps knowing the prioritization algorithm as to be able to
calculate more closely what's in the SSD and what's on the HDD only
would make some sense, BUT, training it by telling it what's to load
fast using "cat `find the-relevant-data/` > /dev/null" single-shot and
perhaps via crontab, should deliver really well.
Tinker
