2007/10/14, daniel g. siegel <[EMAIL PROTECTED]>: > > On So, 2007-10-14 at 12:22 +0300, Roman Kyrylych wrote: > > 2007/10/13, daniel g. siegel <[EMAIL PROTECTED]>: > > > hello! > > > > > > im suffering of slow transfer rates with my external hard disk, which > > > means, that i cant get a transfer rate over 6MB/s. on other computers i > > > could get a transfer rate of about 20-30MB/s. any tips for me? > > > > > > > > [ 401.729959] sdb: assuming drive cache: write through > > > > This is slower than "write back" because it waits for "data has been > > written" confirmation from the drive before sending next block. > > > > Try to change write-cache mode. > > do you just mean adding either "async" or "data=writeback" to the mount > options? >
No, they are filesystem sync and journal options. I don't know why there is "assuming drive cache: write through" and how to change it (probably hdparm/sdparm). We changed "write through" to "write back" on our RAID controller here and it made transfer rates much higher. -- Roman Kyrylych (Роман Кирилич) _______________________________________________ arch mailing list [email protected] http://archlinux.org/mailman/listinfo/arch
