I have found that my server's filesystem is continuously entering read-only mode. There have been some issues with the raid1 array, but I have removed the bad disk from the array. However, it is still physically plugged into the system because I haven't had a chance to go over to the datacentre, I suspect udev and the system kernel is still picking up the bad disk and throwing errors. In /var/log/messages, there are errors like this:

Mar  2 06:53:14 nocloud kernel: ata1: exception Emask 0x10 SAct 0x0 SErr 0x4010000 action 0xe frozen
Mar  2 06:53:14 nocloud kernel: ata1: irq_stat 0x00400040, connection status changed
Mar  2 06:53:14 nocloud kernel: ata1: SError: { PHYRdyChg DevExch }
Mar  2 06:53:14 nocloud kernel: ata1: hard resetting link
Mar  2 06:53:20 nocloud kernel: ata1: link is slow to respond, please be patient (ready=0)
Mar  2 06:53:21 nocloud kernel: ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
Mar  2 06:53:21 nocloud kernel: ata1.00: configured for UDMA/133
Mar  2 06:53:21 nocloud kernel: ata1: EH complete

This happens fairly randomly throughout the day until eventually the filesystem becomes read-only. When this happens, my system becomes non-operational which kind of defeats the purpose of having a raid1. Note, ata1 is the bad disk (I think ata1 corresponds to /dev/sda because they are both first in line).

Under mdadm, /dev/sda1,2 is no longer being used, but I can't prevent the system kernel from continuing to query that disk when I am no longer using it and throwing these errors.

Is there a way to prevent my filesystem from automatically going into read-only mode? Furthermore, is it safe to do so?

Thanks in advance.

EDIT: Additional information: output from cat /proc/mdstat

md1 : active raid1 sdb2[1]
      976554876 blocks super 1.1 [2/1] [_U]
      bitmap: 5/8 pages [20KB], 65536KB chunk

md0 : active raid1 sdb1[1]
      204788 blocks super 1.0 [2/1] [_U]

Output from mount:

/dev/mapper/VolGroup-LogVol00 on / type ext4 (rw,noatime)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw,rootcontext="system_u:object_r:tmpfs_t:s0")
/dev/md0 on /boot type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)

EDIT2: pvdisplay output:

--- Physical volume ---
PV Name               /dev/md1
VG Name               VolGroup
PV Size               931.32 GiB / not usable 2.87 MiB
Allocatable           yes (but full)
PE Size               16.00 MiB
Total PE              59604
Free PE               0
Allocated PE          59604