4 ms·
SSDs read fast, write much slower for anything which is bigger than a few hundred megabytes.
by anticensor 2y ago
SSDs read fast, write much slower for anything which is bigger than a few hundred megabytes.
- baruch 2y agoI'm working mostly with enterprise drives and not consumer. These drives can write continuously at 1 to 4 GB/s depending on the specific type (mixed use vs read intensive vs very low writes).
- wtallis 2y agoEnterprise SSDs usually don't use SLC caching—especially not to the extent that consumer drives do—so their sequential write speed doesn't drop much for really large/sustained writes, and doesn't have a short unsustainable burst of accepting writes quickly into a cache.
- nick__m 2y agoIn high end enterprise storage, the drive do a form of caching (SLC to TLC in background by the drive) and it also does compression and encryption. Look at the Flashcore FCM4 used in IBM Flashsystem. https://www.redbooks.ibm.com/redpapers/pdfs/redp5725.pdf https://www.redbooks.ibm.com/redpapers/pdfs/redp5725.pdf (no affiliation except that work recently aquire an IBM SAN and I am satisfied by this storage unit, it's not like a Purestorage SAN but it's fast enough)
- wtallis 2y agoIBM's drives are exactly why I said "usually don't" rather than "never". SLC caching is still not normal for enterprise drives, whereas it is now universal for consumer SSDs.