Mathieu Bruneau <[EMAIL PROTECTED]> wrote: > > BTW, here's another oddity I noticed - here's typical output from > > "iostat 60": > > > > | avg-cpu: %user %nice %sys %iowait %idle > > | 7.35 0.00 3.59 0.94 88.12 > > | > > | Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn > > | sda 29.20 8.00 342.08 480 20528 > > | sda1 0.00 0.00 0.00 0 0 > > | sda2 0.00 0.00 0.00 0 0 > > | sda3 0.00 0.00 0.00 0 0 > > | sda4 0.00 0.00 0.00 0 0 > > | sda5 43.74 8.00 342.08 480 20528 > > | sdb 2.43 0.00 173.70 0 10424 > > | sdb1 21.71 0.00 173.70 0 10424 > > > > I've been running this for a few hours and it consistently shows lots > > of writes but no reads at all on sdb1, the partition where I have my > > binary logs and tmpdir. Is MySQL writing lots of tmp files and not > > reading them? Or, how else can I interpret this? > > The binlog are creating most of your constant write most probably. If > you have no slave attached, you're not reading them at all...
Yes and no. In fact, this iostat output comes from a slave, where there's hardly any binglog activity (but a fair amount of relay log activity). However, I noticed the same thing on the master. Before tmpdir pointed to a directory on sdb1, there was a much lower, and fairly constant, level of writes to that partition, which did not surprise me. After I pointed tmpdir to sdb1, the amount of write activity grew substantially and started varying much more (from as low as ~50 to as high as ~400), but I still see no reading recorded. -- Cos -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
