fmdump shows errors on a different drive, and none on the one that has this 
slow read problem:

Nov 27 2009 20:58:28.670057389 ereport.io.scsi.cmd.disk.recovered
nvlist version: 0
        class = ereport.io.scsi.cmd.disk.recovered
        ena = 0xbeb7f4dd5300001
        detector = (embedded nvlist)
        nvlist version: 0
                version = 0x0
                scheme = dev
                device-path = /p...@0,0/pci1043,8...@9/d...@2,0
                devid = id1,s...@sata_____samsung_hd753lj_______s1pwj1cq801987
        (end detector)

        driver-assessment = recovered
        op-code = 0x28
        cdb = 0x28 0x0 0x4 0x80 0x32 0x80 0x0 0x0 0x80 0x0
        pkt-reason = 0x0
        pkt-state = 0x1f
        pkt-stats = 0x50
        __ttl = 0x1
        __tod = 0x4b0fa2c4 0x27f043ad


The serial number of the sus drive is S1PWJ1CQ801987.   

iostat -En shows:

c0d0             Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 
Model: ST360021A       Revision:  Serial No: 3HR2AG72        Size: 60.02GB 
<60020932608 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 
Illegal Request: 0 
c6d1             Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 
Model: SAMSUNG HD154UI Revision:  Serial No: S1Y6J1KS720622  Size: 1500.30GB 
<1500295200768 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 
Illegal Request: 0 
c3t0d0           Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 
Vendor: ATA      Product: SAMSUNG HD753LJ  Revision: 1113 Serial No:  
Size: 750.16GB <750156374016 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 
Illegal Request: 28 Predictive Failure Analysis: 0 
[b]c3t1d0           Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 
Vendor: ATA      Product: SAMSUNG HD753LJ  Revision: 1113 Serial No:  
Size: 750.16GB <750156374016 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 
Illegal Request: 49 Predictive Failure Analysis: 0 [/b]
c3t2d0           Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 
Vendor: ATA      Product: SAMSUNG HD753LJ  Revision: 1113 Serial No:  
Size: 750.16GB <750156374016 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 
Illegal Request: 28 Predictive Failure Analysis: 0 
c3t3d0           Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 
Vendor: ATA      Product: SAMSUNG HD753LJ  Revision: 1110 Serial No:  
Size: 750.16GB <750156374016 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 
Illegal Request: 28 Predictive Failure Analysis: 0 
c0t1d0           Soft Errors: 0 Hard Errors: 30 Transport Errors: 0 
Vendor: ATAPI    Product: CD-RW 52X24      Revision: F.JZ Serial No:  
Size: 0.00GB <0 bytes>
Media Error: 0 Device Not Ready: 30 No Device: 0 Recoverable: 0 
Illegal Request: 0 Predictive Failure Analysis: 0
-- 
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