Hi Jerry, It could be a kernel issue; however, currently I'm suspecting that the drive in the new server simply doesn't have the same bandwidth capability. The iostat results I'm getting (although I'm not an expert in reading them, having only learned of it about 3 hours ago) suggest that the older server is handling roughly the same data quantities, but just using a much lower percentage of the drive's bandwidth.
I can't seem to find a tool which reports on exactly how much write bandwidth a drive has; everything seems to focus on reading speed. Thanks, -- Ian Simpson On Fri, 2008-06-13 at 11:18 -0400, Jerry Schwartz wrote: > >Having delved a little more into the capabilities of iostat, I've > >discovered that the drive bandwidth seems to be maxed out while MySQL is > >running, which I'd peg as the primary candidate for the problem. > [JS] That suggests even more strongly that there is a difference in the > kernel > configuration. More physical I/O would drive the traffic up, by definition. > Either MySQL is causing this, or the system file system is causing it. > > > >Looks like I'll be having more words with my hosting company about > >this... > > > >Thanks for all your help > >? > >-- > >Ian Simpson > > > >On Fri, 2008-06-13 at 10:40 -0400, Jerry Schwartz wrote: > >> >Disk usage: the older server (the one that's running fine) is running > >> >more transactions per second, but has lower blocks written and read > >per > >> >second than the new server: > >> [JS] That, to me, suggests that the difference might be in the way the > >systems > >> themselves are configured. Unfortunately, I don't know how Linux > >handles file > >> system buffering. > >> > > >> >The working server (which in addition to replicating is also handling > >a > >> >bunch of read queries) > >> > > >> >Device: tps Blk_read/s Blk_wrtn/s Blk_read > >Blk_wrtn > >> >sda 88.47 782.20 998.77 9046888130 > >11551757459 > >> > > >> >The new server, which is just trying to handle replication > >> > > >> >Device: tps Blk_read/s Blk_wrtn/s Blk_read > >Blk_wrtn > >> >sda 77.83 1367.55 2914.72 358474084 > >764029986 > >> > > >> >Thanks, > >> >? > >> >-- > >> >Ian Simpson > >> > > >> > > >> > > >> >On Fri, 2008-06-13 at 19:15 +0530, Alex Arul Lurthu wrote: > >> >> also how often do you issue a commit. batching the inserts inside a > >> >> transaction might help. > >> >> > >> >> On Fri, Jun 13, 2008 at 6:53 PM, Ananda Kumar <[EMAIL PROTECTED]> > >> >> wrote: > >> >> check for iostat to see if the disk is heavly used. > >> >> > >> >> > >> >> On 6/13/08, Ian Simpson <[EMAIL PROTECTED]> wrote: > >> >> Hi Alex, > >> >> > >> >> Configurations are identical, other than the > >> >> differences I initially > >> >> mentioned. I've diffed both the configuration files > >> >> and the output of > >> >> SHOW VARIABLES on both servers. > >> >> > >> >> I've contacted my hosting provider to ask about the > >> >> RAID settings. > >> >> > >> >> Variable_name: innodb_flush_log_at_trx_commit > >> >> Value: 1 > >> >> Variable_name: sync_binlog > >> >> Value: 0 > >> >> Variable_name: innodb_locks_unsafe_for_binlog > >> >> Value: OFF > >> >> > >> >> Thanks > >> >> > >> >> -- > >> >> Ian Simpson > >> >> > >> >> On Fri, 2008-06-13 at 17:43 +0530, Alex Arul Lurthu > >> >> wrote: > >> >> > Please check if the my.cnf configurations to be > >the > >> >> same. > >> >> > > >> >> > What are your configuration parameters in terms > >of > >> >> innodh flush log > >> >> > trx commit , bin logging, sync binlog and innodb > >> >> unsafe for binlog ? > >> >> > > >> >> > If the systems have raid, check if the BBWC is > >> >> enabled on the new host > >> >> > and WB is enabled. > >> >> > > >> >> > > >> >> > On Fri, Jun 13, 2008 at 5:02 PM, Ian Simpson > >> >> <[EMAIL PROTECTED]> > >> >> > wrote: > >> >> > Hi list, > >> >> > > >> >> > Have a bit of a mystery here that I hope > >> >> somebody can help > >> >> > with. > >> >> > > >> >> > I've just got a new server that I'm using > >as > >> >> a dedicated MySQL > >> >> > server. > >> >> > In terms of hardware it's pretty much > >> >> identical, if not > >> >> > slightly > >> >> > superior to an existing server already in > >> >> production use. > >> >> > > >> >> > It's having a real struggle processing > >> >> INSERT statements to > >> >> > InnoDB > >> >> > tables; it's maxing out at around 100 > >> >> inserts per second, even > >> >> > with very > >> >> > simple two column tables (inserts into > >> >> MyISAM tables run > >> >> > fine). > >> >> > Meanwhile, the original server can > >happily > >> >> process around 1000 > >> >> > inserts/sec into an identical table. > >> >> > > >> >> > The MySQL configuration of the two > >databases > >> >> is identical, > >> >> > except for > >> >> > the tablespace file size (the new server > >has > >> >> a larger > >> >> > tablespace > >> >> > defined), and the InnoDB logs (again, new > >> >> server has larger > >> >> > logs). > >> >> > > >> >> > Can anybody suggest an area of > >investigation > >> >> as to the cause? > >> >> > > >> >> > Thanks, > >> >> > -- > >> >> > Ian Simpson > >> >> > > >> >> > This email may contain confidential > >> >> information and is > >> >> > intended for the recipient(s) only. 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