Bruce Momjian wrote:
I have added documentation about the ATAPI drive flush command, and the typical SSD behavior.
If one of us goes back into that section one day to edit again it might be worth mentioning that FLUSH CACHE EXT is the actual ATAPI-6 command that a drive needs to support properly. I wouldn't bother with another doc edit commit just for that specific part though, pretty obscure.
I find it kind of funny how many discussions run in parallel about even really detailed technical implementation details around the world. For example, doesn't http://www.mail-archive.com/zfs-discuss@xxxxxxxxxxxxxxx/msg30585.html look exactly like the exchange between myself and Arjen the other day, referencing the same AnandTech page?
Could be worse; one of us could be the poor sap at http://opensolaris.org/jive/thread.jspa;jsessionid=41B679C30D136C059E1BB7C06CA7DCE0?messageID=397730 who installed Windows XP, VirtualBox for Windows, an OpenSolaris VM inside of it, and then was shocked that cache flushes didn't make their way all the way through that chain and had his 10TB ZFS pool corrupted as a result. Hurray for virtualization!
-- Greg Smith 2ndQuadrant US Baltimore, MD PostgreSQL Training, Services and Support greg@xxxxxxxxxxxxxxx www.2ndQuadrant.us -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
