bin/167575: mfiutil(8) claims battery is OK even though it is worn out and wb cache is disabled

[Vincent Hoffman]

The following reply was made to PR bin/167575; it has been noted by GNATS.

From: Vincent Hoffman <vince at unsane.co.uk>
To: bug-followup at FreeBSD.org, emaste at FreeBSD.org
Cc:  
Subject: Re: bin/167575: mfiutil(8) claims battery is OK even though it is
 worn out and wb cache is disabled
Date: Thu, 12 Dec 2013 10:02:41 +0000

 Issue still exists with 8.4
 FreeBSD banshee.namesco.net 8.4-RELEASE-p6 FreeBSD 8.4-RELEASE-p6 #0
 r259163: Tue Dec 10 10:40:01 GMT 2013    
 toor at banshee.namesco.net:/usr/src/sys/amd64/compile/BANSHEE  amd64
 
 The server still works but write cache being disabled makes a huge
 difference to IO
 
 root at banshee # mfiutil cache 0
 mfi0 volume mfid0 cache settings:
              I/O caching: writes and reads
            write caching: write-back
 write cache with bad BBU: disabled
               read ahead: always
        drive write cache: enabled
 Cache Disabled Due to Dead Battery
 ($09:52:35 <~>$) 0
 root at banshee # mfiutil show battery
 mfi0: Battery State:
      Manufacture Date: 6/3/2011
         Serial Number: 637
          Manufacturer: LS1191002A
                 Model: 3150302
             Chemistry: LION
       Design Capacity: 1215 mAh
  Full Charge Capacity: 549 mAh
      Current Capacity: 534 mAh
         Charge Cycles: 66
        Current Charge: 97%
        Design Voltage: 3700 mV
       Current Voltage: 4048 mV
           Temperature: 39 C
                Status: normal