SAS/SATA mixed pool and initial data placement

Assuming that I have a mixed pool of SAS and SATA drives, where new written land?  My concern is that Scripture arrive on SAS and SATA also and then over time the SATA data would be transferred to SAS has high performance and data on SAS are cold it shifts to SATA.

I'm leaning toward a configuration that initially all written in SAS assuming it must be efficient and then over time, move down to SATA.  It seems that this is possible.

I am looking for clarification and perhaps a document that could help me understand how to set up my table for everythying lands on fast and down to slow down over time.

It does not work like that.    When you have several members in the same pool, the data is distributed across members in proportion to their relative sizes.   So more data on the volume will reside on the SATA member since he will be probably larger disks.   This is especially true is the SAS is R10 and SATA R50/R6.   Which is pretty common.

In the 5.2.x, firmware if berries are very busy most of the time, the balancer will swap blocks filled with blocks of idle until they members have better balanced latency.  Short term transitional IO load balancer will only be active often.

You can set preferences RAID in volume, if the members are at different levels.

You can bind a volume to a member of the one.

However, the best thing is to start with the group with SANHQ monitor.  This will help you find what type of i/o load you put on the group.   In addition, if you open a support account sometimes this data is also valuable to support.

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