Hmm, the array has 24 disks, the second group has 12 disks, the first has 13 disks with 12 listed - strange.
I noticed the firmware is very, very old - maybe we hit a (known and fixed) bug?
A problem after replacing a disk?
Current version is TS252P001 - you have TS200R021 from year 2010.
Since everything is still fault tolerant, I would consider a firmware upgrade.
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Version:TS252P001 (1 Mar 2016)
Version:TS252R007 (3 Jun 2015)
Version:TS251P006-02 (9 Sep 2014)
Version:TS230P008 (B) (15 Aug 2014)
Version:TS250P003 (A) (15 Aug 2014)
Version:TS251P005 (17 Jul 2014)
Version:TS251P004-02 (18 Jun 2014)
Version:TS251P003-02 (11 Jun 2014)
Version:TS251R004 (17 Mar 2014)
Version:TS250P003 (2 Oct 2013)
Version:TS250P002 (12 Jul 2013)
Version:TS250R023 (5 Apr 2013)
Version:TS240P004-02 (2 Nov 2012)
Version:TS240P003 (13 Jul 2012)
Version:TS230P008 (A) (6 Jul 2012)
Version:TS240P001 (4 Jun 2012)
Version:TS230P008 (22 Nov 2011)
Version:TS201P007 (16 Feb 2011)
Version:TS201P004 (13 Jan 2011)
Version:TS201R015 (22 Nov 2010)
Version:TS201R014 (15 Sep 2010)
Version:TS200R021 (18 Jun 2010)
Version:TS252R007 (3 Jun 2015)
Version:TS251P006-02 (9 Sep 2014)
Version:TS230P008 (B) (15 Aug 2014)
Version:TS250P003 (A) (15 Aug 2014)
Version:TS251P005 (17 Jul 2014)
Version:TS251P004-02 (18 Jun 2014)
Version:TS251P003-02 (11 Jun 2014)
Version:TS251R004 (17 Mar 2014)
Version:TS250P003 (2 Oct 2013)
Version:TS250P002 (12 Jul 2013)
Version:TS250R023 (5 Apr 2013)
Version:TS240P004-02 (2 Nov 2012)
Version:TS240P003 (13 Jul 2012)
Version:TS230P008 (A) (6 Jul 2012)
Version:TS240P001 (4 Jun 2012)
Version:TS230P008 (22 Nov 2011)
Version:TS201P007 (16 Feb 2011)
Version:TS201P004 (13 Jan 2011)
Version:TS201R015 (22 Nov 2010)
Version:TS201R014 (15 Sep 2010)
Version:TS200R021 (18 Jun 2010)