Does anybody had a problem with loosing updates to the disks in the Volumes?
I had a situation where I Updated some files in a PDS from a ISPF/TSO and them after a restart ( shutdown z/OS, awsstop and the start all over ) I lost the updates. This happened only two times, but could not determine teh cause.
In the last occurrence I runned a awsckmap while z/OS was still up, but I think this should not be a problem right?
I am wondering how 1090 decides to write the updates to disks, and if it tries to keep in some caching and do the writes periodically?

I have not seen any specific instances of this, however, I always do an orderly shutdown of my system, including $P JES2 to make sure all IO has completed.

John

z1090 does not do anything unique to write to the actual hard drive file. It uses base Linux functions. From your post, I did not hear of any unusual situation like a Linux kernel crash, power failure, etc. If some thing like that happen, please let us know. We have heard of data lost in those situations. Linux caches the data and then writes it to the drive at some later time. This could be as much as 30sec and is managed by the Linux kernel. I am curious to know which native Linux distribution and os level of the system you are running on. Running awsckmap against your devmap would not cause any problem while zOS is running.