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Hmmm. Something is wrong with SDA. Let's test it:

And look at the results:

The last 5 result log shows:
Error: UNC 8 sectors at LBA = 0x00384622 = 3687970

SMART Self-test log structure revision number 1
Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
# 1 Short offline Completed: read failure 10% 44084 976766499

So we have to find the filesystem. Usually it would be:

I get:

Using:
((976766499- 208770) * 512) / 4096

We get:
122069716 LBA block.

But wait, the filesystem isn't on sda, it's on /dev/main/root. Here's how:

So we know files system is mounted at /dev/main/root and it is ext3 type.

We can find the BLOCK SIZE by:

I get:

We're still at 122069716 LBA block.
Or specifically 122069716.125 or the second of 8 sectors in this block.

We can test the block by:

In short, it looks like this:

==================================================================
sda1  sdb1
    |
     md1

        sdb1 sdb2
            |
             md2
            |
        pv (md2)
            |
        vg (main)
    /            \
lv (main/root)        lv (main/swap)