On RAID 10 - How to relieve Log Writer Slow Write Time Trace Files

We have a DELL 8 CPU 5460 3.16Ghz Xeon with Dell Open Manage RAID 10 array
Oracle 10g 10.2.0.4 on RedHat EL 5 with
filesystemio_options='' (DEFAULT)
disk_asynch_io='TRUE' ( NOT DEFAULT)
Running 2 instances 64 bit 10g 10.2.0.4 with an app that does a lot of row updates and uses BLOBs heavily.
Our storage (RAID 10) is presented through a single mount point.
I periodically see these messages in a lgwr trc file as follows
Warning: log write time 560ms, size 5549KB
*** 2010-02-25 17:22:24.574
Warning: log write time 650ms, size 6759KB
*** 2010-02-25 17:22:25.103
Warning: log write time 510ms, size 73KB
*** 2010-02-25 20:33:00.015
Warning: log write time 540ms, size 318KB
*** 2010-02-25 20:35:17.956
Warning: log write time 800ms, size 5KB
Note that most of these are larger chunks of data.
Our log wait histogram is as follows:
106 log file parallel write 1 465780158
106 log file parallel write 2 5111874
106 log file parallel write 4 5957262
106 log file parallel write 8 2171240
106 log file parallel write 16 1576186
106 log file parallel write 32 1129199
106 log file parallel write 64 852217
106 log file parallel write 128 2092462
106 log file parallel write 256 508494
106 log file parallel write 512 109449
106 log file parallel write 1024 55441
106 log file parallel write 2048 11403
106 log file parallel write 4096 1197
106 log file parallel write 8192 29
106 log file parallel write 16384 5
In discussions with the group that builds and maintains the systems (DBA's do not) we have asked for more spindles / hba's / mount points to address this issue. We have been advised that since the RAID 10 spreads the I/Os across multiple drives this is not going to affect the situation.
Our thoughts are that multiple HBAs going to separate RAID 10 devices would help relieve the pressure.
Thank you.

Is this an internal RAID array? Is it composed of SCSI (SAS) or SATA drives? How many drives are in the array?
Does the RAID controller have a built in battery backed cache (some of Dell's RAID controllers have 128MB, 256MB, or 512MB of battery backed cache). If the RAID controller has a battery backed cache, consider disabling the caching of all read operations, and set the write policy to write-back (see: http://support.dell.com/support/edocs/software/svradmin/5.1/en/omss_ug/html/cntrls.html ).
Charles Hooper
Co-author of "Expert Oracle Practices: Oracle Database Administration from the Oak Table"
http://hoopercharles.wordpress.com/
IT Manager/Oracle DBA
K&M Machine-Fabricating, Inc.

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