Kasper Dupont <87385155133026632046@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > On the 2.6 system where I see the differences between mirrors > /proc/ide/hde/settings:wcache 1 write cache enabled. Btw... don't disable it on a production system without previously thinking about it :) Disabling write cache leads to massive performance decrease on heavy simultaneous I/O... On a system with (IMHO not heavy but significant) simultaneous I/O I got 35MB/s write speed on dd with write cache enabled and it shrunk down to 9MB/s with write cache disabled - while load grew up from ~0 to ~8. > On a 2.4 system where I see no differences between mirrors I > /proc/ide/hde/settings:wcache 0 0 1 rw > So how should I interpret this? As I said - on 2.4 write cache reporting through /proc is broken: it always reports disabled write cache, while it is not necessarily disabled. Use hdparm -I instead (big I, not small i). regards Mario -- "Why are we hiding from the police, daddy?" | J. E. Guenther "Because we use SuSE son, they use SYSVR4." | de.alt.sysadmin.recovery - 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
