On Fri, 13 Sep 2013, Derek Piper wrote:
I have 2 Sandisk Extreme 120GB SSDs (Sandforce 2281 with latest firmware - R211). I have indeed heard that TRIM was desirable to limit the effects of write amplification and to keep the write performance to a good level throughout the life of the drive(s). This machine is a home file/print/web/mysql server (the real large data being on regular 7200RPM HDD RAID arrays). The SSDs are for boot, root and home directories.
You're most likely much better off by just using 80 gigs out of those 120 gig drives (don't use all space for partition) to avoid write amplification.
TRIM has performance problems on some hardware (takes a long time per block), it's probably just better and easier to just keep blocks unused (never written to) and ignore TRIM.
https://en.wikipedia.org/wiki/Write_amplification#Over-provisioning -- Mikael Abrahamsson email: swmike@xxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
