I have checked the filesystem. but how to check raid health status?
I have restarted the system and durign first reboot it showed that unit 1 is unavailable.
and continued to boot. I have shut down it again, removed the drive and put again.
At the next startup there was no warning like at the first one.
I also tried to copy 400 MB file from macintosh and it is performed in steps:
1. The first 220 MB goes smoothly, just a few seconds and then:
2. Stops for 40s showing 5s to end
3. Transfers next part and stops at 385 MB for 30 s
4. transfers the rest of the file

For smaller file it stops at about 75% of the file size and waits about 40s

What to check next?
How to check RADID health status?
Looking forward to answers.
Pawel