Since your Server has about 4TB Logical Volume to rebuild from "good" disk (D006) to the replaced one (D007):
[2017-07-19 09:03:50] Array B Unit U01: RAID 1
[2017-07-19 09:03:50] U01 from 2 drives: D006D007[R]
[2017-07-19 09:03:50] stripsize=512 (256 KiB) volstate=NEEDS_REBUILD datadrives=1 paritygroups=1 cache=disabled accel=disabled/disabled
[2017-07-19 09:03:50] offset=0x0 logical_blocks=0x1D1BFBEB0 (3725 GiB)
[2017-07-19 09:03:50] uf=0x0 srf=0x1 dt=3 pdm=0 psf=4 bd=0x0 naz=0x0 nwz=0x0 bsf=512 muf=0x0
where D006 and D007 disks are, respectively:
[2017-07-19 09:03:50] D006 p0|0x1 [01]P2I:02:03,HDD ATA ,ST4000NM0033-9ZM,SN06 ,S1Z2GDX1 ,NCQ,07K,SCFW=11,SCTYPE=1
[2017-07-19 09:03:50] D007 p0|0x1 [01]P2I:02:04,HDD ATA ,ST4000NM0033-9ZM,SN06 ,S1Z2KC9C ,NCQ,07K,SCFW=11,SCTYPE=1
supposing the only one remaining disk (D006) of that particular RAID 1 is good enough (has no unrecoverable errors) then the rebuilt process - in the very best case - would be very long (leaving the RAID 1 Volume U01 "degraded" and so unprotected against another drive failure)...probably it would take up to 2 weeks (considering an average of 20 minutes per Gigabyte)...if it starts.
It's not starting...AFAIK.
Regarding the ADU logged Error, the HPE ProLiant Gen9 Troubleshooting Guide (Volume II: Error Messages) reports:
Logical drive state: The logical drive is queued for rebuilding
Symptom
Logical drive state: The logical drive is queued for rebuilding.
Cause
A logical drive is queued for rebuilding.
Action
No action is required. Normal operations can occur; however, performance will be less than optimal during the rebuilding process.
Maybe I'm wrong in reading ADU logs...but it seems that the drive you used as replacement (D007) ran for at least 1400 hours (Power On hours) - so it's not "new" - compared to about 8300 hours of the drive your RAID 1 is rebuilding from (D006)...don't know if this is positive or not regarding rebuilding speed (Server I/O Load it is for sure...since Online rebuilding happens when OS is running...you should consider this point)...another thing to say reading your logs (Slot0b.txt) is that D006 and D007 about 1 Year ago (August 2016) were differents units (see theirs respective Serial Numbers), same models:
[2016-06-28 09:05:06] D006 p0|0x1 [01]P2I:02:03,HDD ATA ,ST4000NM0033-9ZM,0001 ,Z1Z0TMBP ,NCQ,07K,SCFW=11,SCTYPE=1
[2016-06-28 09:05:06] D007 p0|0x1 [01]P2I:02:04,HDD ATA ,ST4000NM0033-9ZM,0001 ,Z1Z18VW3 ,NCQ,07K,SCFW=11,SCTYPE=1
this means that something (bad sectors? failure(s) due to overtemperature?) already happened in the past to those two drives (initial D006 failure - U01 remained in degraded state for days/weeks since D006 was replaced with a new Disk, then rebuild started finally on September, 9th 2016 [*] and then, June 22nd 2017 very bad day for you old D007 disk this time, your Server started to have another issue on your old D007 - the one with S/N Z1Z18VW3 - replaced the day after).
On June, 23rd D007 was replaced with the one your Server has actually (S/N S1Z2KC9C) but its rebuild process never started (or, eventually if started as expected, never actually ended...which is a thing I personally doubt).
Also Surface Analysis processes seem to have, generally speaking, issues - Surface Analysis not completed - on all your RAID 1 / RAID 5 Volumes (at least for U00, U01 and U02 as per ADU Logs)
At this point, what's about:
- Checking your Server's status regarding Firmware version (especially the SystemROM for your Server which embed Firmware for Dynamic Smart Array B140i) and B140i Software Drivers version (especially the Storage driver) for your Microsoft Windows Server 2012 R2 operating system?
- Checking if disks you use are good enough (failure rate is strange or they are very heavily used or not best suited to be used into a Server) considering they look like non genuine HPE SATA drives (their Firmware looks the Seagate Constellation ES.3 original one, not the typical HPE - HPxx(x) - customized one found on genuine branded HPE drives for HPE ProLiant Gen9).
- Checking Server's operational temperature (the higher it is the worst it is for rotational disks).
So questions, in the end, are:
- Why rebuild process of U01 is not starting?
- Is the D006 drive really good? (it hasn't unrecoverable errors that may stop rebuild process to start)
Note that Rebuild Priority for the HPE Dynamic Smart Array B140i is set to Rapid High.
[*] September, 9th rebuild of D006 from D007 happened:
[2016-09-09 10:29:19] Array B Unit U01: RAID 1
[2016-09-09 10:29:19] U01 from 2 drives: D006[R] D007
[2016-09-09 10:29:19] stripsize=512 (256 KiB) volstate=NEEDS_REBUILD datadrives=1 paritygroups=1 cache=enabled accel=disabled/disabled
[2016-09-09 10:29:19] offset=0x0 logical_blocks=0x1D1BFBEB0 (3725 GiB)
[2016-09-09 10:29:19] uf=0x0 srf=0x1 dt=3 pdm=0 psf=4 bd=0x0 naz=0x0 nwz=0x0 bsf=512 muf=0x0
[2016-09-09 10:29:19] Array B Unit U01: RAID 1
[2016-09-09 10:29:19] U01 from 2 drives: D006[R] D007
[2016-09-09 10:29:19] stripsize=512 (256 KiB) volstate=REBUILDING datadrives=1 paritygroups=1 cache=enabled accel=disabled/disabled
[2016-09-09 10:29:19] offset=0x0 logical_blocks=0x1D1BFBEB0 (3725 GiB)
[2016-09-09 10:29:19] uf=0x0 srf=0x1 dt=3 pdm=0 psf=4 bd=0x0 naz=0x0 nwz=0x0 bsf=512 muf=0x0
[2016-09-09 10:29:19] Starting rebuild U01 D006 ibc=2048
[2016-09-09 10:39:19] Rebuild progress U01 D006: 0x1C66B16B0 blocks remaining, 2.5% complete (will START OVER if reset)
[2016-09-09 10:49:20] Rebuild progress U01 D006: 0x1BB09D6B0 blocks remaining, 4.9% complete (will START OVER if reset)
[2016-09-09 10:59:21] Rebuild progress U01 D006: 0x1AFA4F6B0 blocks remaining, 7.4% complete (will START OVER if reset)
[2016-09-09 11:09:22] Rebuild progress U01 D006: 0x1A458F6B0 blocks remaining, 9.8% complete (will START OVER if reset)
[2016-09-09 11:19:22] Rebuild progress U01 D006: 0x19923B6B0 blocks remaining, 12.2% complete (will START OVER if reset)
[2016-09-09 11:29:24] Rebuild progress U01 D006: 0x18DE92EB0 blocks remaining, 14.6% complete (will START OVER if reset)
[2016-09-09 11:39:25] Rebuild progress U01 D006: 0x182BC76B0 blocks remaining, 17.0% complete (will START OVER if reset)
[2016-09-09 11:49:26] Rebuild progress U01 D006: 0x177B946B0 blocks remaining, 19.4% complete (will START OVER if reset)
[2016-09-09 11:59:26] Rebuild progress U01 D006: 0x16CAFBEB0 blocks remaining, 21.7% complete (will START OVER if reset)
[2016-09-09 12:09:27] Rebuild progress U01 D006: 0x161D216B0 blocks remaining, 24.1% complete (will START OVER if reset)
[2016-09-09 12:19:27] Rebuild progress U01 D006: 0x156FFE6B0 blocks remaining, 26.4% complete (will START OVER if reset)
[2016-09-09 12:29:28] Rebuild progress U01 D006: 0x14C3756B0 blocks remaining, 28.7% complete (will START OVER if reset)
[2016-09-09 12:39:29] Rebuild progress U01 D006: 0x141A45EB0 blocks remaining, 31.0% complete (will START OVER if reset)
[2016-09-09 12:49:31] Rebuild progress U01 D006: 0x1370DEEB0 blocks remaining, 33.3% complete (will START OVER if reset)
[2016-09-09 12:59:32] Rebuild progress U01 D006: 0x12C7536B0 blocks remaining, 35.5% complete (will START OVER if reset)
[2016-09-09 13:09:33] Rebuild progress U01 D006: 0x12219E6B0 blocks remaining, 37.8% complete (will START OVER if reset)
[2016-09-09 13:19:35] Rebuild progress U01 D006: 0x117BE16B0 blocks remaining, 40.0% complete (will START OVER if reset)
[2016-09-09 13:29:36] Rebuild progress U01 D006: 0x10D8BF6B0 blocks remaining, 42.2% complete (will START OVER if reset)
[2016-09-09 13:39:37] Rebuild progress U01 D006: 0x103661EB0 blocks remaining, 44.4% complete (will START OVER if reset)
[2016-09-09 13:49:38] Rebuild progress U01 D006: 0xF9719EB0 blocks remaining, 46.5% complete (will START OVER if reset)
[2016-09-09 13:59:38] Rebuild progress U01 D006: 0xEF8736B0 blocks remaining, 48.6% complete (will START OVER if reset)
[2016-09-09 14:09:40] Rebuild progress U01 D006: 0xE5B566B0 blocks remaining, 50.7% complete (will START OVER if reset)
[2016-09-09 14:19:40] Rebuild progress U01 D006: 0xDBFF36B0 blocks remaining, 52.8% complete (will START OVER if reset)
[2016-09-09 14:29:41] Rebuild progress U01 D006: 0xD27086B0 blocks remaining, 54.9% complete (will START OVER if reset)
[2016-09-09 14:39:42] Rebuild progress U01 D006: 0xC8FC9EB0 blocks remaining, 56.9% complete (will START OVER if reset)
[2016-09-09 14:49:43] Rebuild progress U01 D006: 0xBFAC26B0 blocks remaining, 58.9% complete (will START OVER if reset)
[2016-09-09 14:59:44] Rebuild progress U01 D006: 0xB679E6B0 blocks remaining, 60.9% complete (will START OVER if reset)
[2016-09-09 15:09:45] Rebuild progress U01 D006: 0xAD4C16B0 blocks remaining, 62.8% complete (will START OVER if reset)
[2016-09-09 15:19:46] Rebuild progress U01 D006: 0xA4710EB0 blocks remaining, 64.7% complete (will START OVER if reset)
[2016-09-09 15:29:47] Rebuild progress U01 D006: 0x9B94AEB0 blocks remaining, 66.6% complete (will START OVER if reset)
[2016-09-09 15:39:49] Rebuild progress U01 D006: 0x92E556B0 blocks remaining, 68.5% complete (will START OVER if reset)
[2016-09-09 15:49:49] Rebuild progress U01 D006: 0x8A701EB0 blocks remaining, 70.3% complete (will START OVER if reset)
[2016-09-09 15:59:50] Rebuild progress U01 D006: 0x81FA46B0 blocks remaining, 72.1% complete (will START OVER if reset)
[2016-09-09 16:09:51] Rebuild progress U01 D006: 0x799F96B0 blocks remaining, 73.9% complete (will START OVER if reset)
[2016-09-09 16:19:51] Rebuild progress U01 D006: 0x715E6EB0 blocks remaining, 75.7% complete (will START OVER if reset)
[2016-09-09 16:29:52] Rebuild progress U01 D006: 0x6942DEB0 blocks remaining, 77.4% complete (will START OVER if reset)
[2016-09-09 16:39:53] Rebuild progress U01 D006: 0x615F76B0 blocks remaining, 79.1% complete (will START OVER if reset)
[2016-09-09 16:49:54] Rebuild progress U01 D006: 0x59AB66B0 blocks remaining, 80.8% complete (will START OVER if reset)
[2016-09-09 16:59:54] Rebuild progress U01 D006: 0x51F5FEB0 blocks remaining, 82.5% complete (will START OVER if reset)
[2016-09-09 17:09:55] Rebuild progress U01 D006: 0x4A93F6B0 blocks remaining, 84.0% complete (will START OVER if reset)
[2016-09-09 17:19:56] Rebuild progress U01 D006: 0x43347EB0 blocks remaining, 85.6% complete (will START OVER if reset)
[2016-09-09 17:29:57] Rebuild progress U01 D006: 0x3C1F06B0 blocks remaining, 87.1% complete (will START OVER if reset)
[2016-09-09 17:39:57] Rebuild progress U01 D006: 0x3524CEB0 blocks remaining, 88.6% complete (will START OVER if reset)
[2016-09-09 17:49:59] Rebuild progress U01 D006: 0x2E298EB0 blocks remaining, 90.1% complete (will START OVER if reset)
[2016-09-09 18:00:00] Rebuild progress U01 D006: 0x27628EB0 blocks remaining, 91.6% complete (will START OVER if reset)
[2016-09-09 18:10:01] Rebuild progress U01 D006: 0x20C1F6B0 blocks remaining, 93.0% complete (will START OVER if reset)
[2016-09-09 18:20:02] Rebuild progress U01 D006: 0x1A3986B0 blocks remaining, 94.4% complete (will START OVER if reset)
[2016-09-09 18:30:04] Rebuild progress U01 D006: 0x1400E6B0 blocks remaining, 95.8% complete (will START OVER if reset)
[2016-09-09 18:40:06] Rebuild progress U01 D006: 0xDCABEB0 blocks remaining, 97.1% complete (will START OVER if reset)
[2016-09-09 18:50:08] Rebuild progress U01 D006: 0x7BFEEB0 blocks remaining, 98.4% complete (will START OVER if reset)
[2016-09-09 19:00:10] Rebuild progress U01 D006: 0x1E076B0 blocks remaining, 99.6% complete (will START OVER if reset)
[2016-09-09 19:03:25] Ending rebuild U01 D006 status=0x0
[2016-09-09 22:02:13] Logical drive U01 has completed a surface analysis pass.