dillondf

4 ms·

1.
by dillondf 12y ago
There is something called read-disturb, where reading a row of NAND over and over again can disturb adjacent rows. The effect is many orders of magnitude lower than the erase wear effect and data caching within the drive (as well as data c
2.
by dillondf 12y ago
Durability has steadily decreased as flash density has increased. 10000, then 5000, then 2000 for standard MLC parts over the last few years as densities have increased. I'm not sure what Samsung's new 3D process is. At the sam
3.
by dillondf 12y ago
No, nobody is magicking up any fairy dust here. The author (which is me) is looking at things realistically. My maintenance costs just from a time perspective are already radically lower. In anycase, so as long as the SSD is powered and t
4.
by dillondf 12y ago
Well, I probably don't have to tell people to never run copper between buildings. Always run fiber. The longer the runs, the higher the common mode voltage between grounds and the higher the stress on the isolation circuitry. Plus l
5.
by dillondf 12y ago
It's really unclear whether explicitly initiated tests actually help for a SSD. The SSD has its own internal mechanisms to scan the flash chips which (I presume) is unrelated to SMART, since they are required for normal operation... p
6.
by dillondf 12y ago
Basically only buy SSD brands who either are chip fabs or have a relationship with a single chip fab. So. Intel, Crucial, Samsung, maybe one or two others. And that's it. And frankly I have to say that only Intel and Crucial have be
7.
by dillondf 12y ago
You do understand that flash erase blocks are around 128KB now, right? Random writes to a SSD can only be write-combined to a point. Once the SSD has to actually start erasing blocks and doing collections of those randomly combined sector
8.
by dillondf 12y ago
To be clear here, what the poster means is that piecemeal database writes of, say, 128-byte records can cause a huge amount of write amplification, so 100GB/day worth of database writes can end up being 1000GB/day worth of flash r
9.
by dillondf 12y ago
There are certainly workloads that will wear out a SSD, random database writes being the most common. But that is only a very small portion of the storage ecosystem, not to mention that there are plenty of ways to retool SQL backends to no