StorEdge 6120 - battery replacement

The battery is very important part of the 6120, since in case of AC power failure it provides power so array can flush cached data to disks. 

If you are running array with failed batteries (or they are in charge), the cache mode is write-through. 
Once at least one battery is fully charged, the cache mode is write-behind. 

Try not to stock too long spare batteries in your office, since shelf life is 2 years. 

Once you get a message that battery fails, check FRU status. 
# fru stat
POWER   STATUS   STATE       SOURCE  OUTPUT  BATTERY  TEMP    FAN1    FAN2
------  -------  ---------   ------  ------  -------  ------  ------  ------
u1pcu1  ready    enabled     line    normal  normal   normal  normal  normal
u1pcu2  ready    enabled     line    normal  failed   normal  normal  normal
u2pcu1  ready    enabled     line    normal  normal   normal  normal  normal
u2pcu2  ready    enabled     line    normal  normal   normal  normal  normal

Refresh command shows battery status. 
# refresh -s
Current Date and Time:  Mon Sep 14 13:52:09 PDT 2009
Next Scheduled Refresh: Mon Sep 21 02:06:21 PDT 2009
Battery   State     Last Health Check              Warranty Expiration
-------   -------   ----------------------------   ----------------------------
u1b1      normal    Mon Sep 14 10:38:51 PDT 2009   Wed Apr 15 14:41:24 PDT 2009
u1b2      failed    Mon Sep 14 10:44:49 PDT 2009   Thu Oct 07 15:57:17 PDT 2010
u2b1      normal    Mon Sep 14 05:46:01 PDT 2009   Sat Dec 19 08:16:40 PST 2009
u2b2      normal    not tested                     Wed Sep 14 08:23:09 PDT 2011

Replace the battery, as you can see it's part of the power supply. 



Additional exercise is required after replacement: 

Well, Sun claims that command sun can be used only by Sun authorized personal, but let's ignore this and run the command. 
# sun
Password: yeah you need this, it's arrayservice
sun: commands enabled

See usage of .bat command
# .bat
Usage :
        bat -c u[encid]pcu[1|2]       ----> clear battery status
        bat -d [u[encid]pcu[1|2]]     ----> complete debugging information
        bat -D [u[encid]pcu[1|2]]     ----> limited debugging information
        bat -f u[encid]pcu[1|2]       ----> mark battery as failed
        bat -i u[encid]pcu[1|2]       ----> initialize battery warranty date
        bat -m [norm|none|fast]       ----> battery management mode
        bat -r u[encid]pcu[1|2]       ----> set recharge date to current date
        bat -s u[encid]pcu[1|2]       ----> battery status information
        bat -u                        ----> update cache mode calculation

See battery info
# .bat -s u1b2
Current Date and Time:  Mon Sep 14 14:06:13 PDT 2009
Manufactured:           Fri May 16 11:44:29 PDT 2008
Warranty Start:         Tue Oct 07 15:57:17 PDT 2008
Warranty Expiration:    Thu Oct 07 15:57:17 PDT 2010
Last Health Check:      Mon Sep 14 10:44:49 PDT 2009
Last Recharge:          Mon Sep 14 14:05:48 PDT 2009
Battery Status: 10 = failed - discharge
PCU is running on AC input.
Charger is active.
PCU is not healthy.
Enclosure 1 power is not safe.
Data cache is not safe.
No health check(s) are running.

Clear battery status

# .bat -c u1b2

Initialize battery warranty date

# .bat -i u1b2

Set recharge date to date you replaced battery - current time. 

# .bat -r u1b2

See info again - yes, warranty starts from current date. 
# .bat -s u1b2
Current Date and Time:  Mon Sep 14 15:05:28 PDT 2009
Manufactured:           Fri May 16 11:44:29 PDT 2008
Warranty Start:         Mon Sep 14 14:06:48 PDT 2009
Warranty Expiration:    Wed Sep 14 14:06:48 PDT 2011
Last Health Check:      not tested
Last Recharge:          never
Battery Status: 2 = charge
PCU is running on AC input.
Charger is active.
PCU is healthy. (test/charge)
Enclosure 1 power is safe. (test/charge)
Data cache is safe.
Health check(s) in progress. (1)

Starts the refresh cycle
# refresh -c
Waiting for tests to start ..............................
Tests on 1 of 2 enclosures started normally.
Check system logs and `refresh -s` output for more details.

Check status again. 
# refresh -s

Current Date and Time:  Mon Sep 14 14:08:19 PDT 2009
There are 1 enclosures running health checks.
Battery   State     Last Health Check              Warranty Expiration
-------   -------   ----------------------------   ----------------------------
u1b1      normal    Mon Sep 14 10:38:51 PDT 2009   Wed Apr 15 14:41:24 PDT 2009
u1b2      charge    not tested                     Wed Sep 14 14:06:48 PDT 2011
u2b1      in test   Mon Sep 14 05:46:01 PDT 2009   Sat Dec 19 08:16:40 PST 2009
u2b2      normal    not tested                     Wed Sep 14 08:23:09 PDT 2011

Check cache mode status. 
# vol mode
volume         mounted cache        mirror
vol1           yes     writebehind  on
vol2           yes     writebehind  on