CS stopped to function properly with the following messages in the log file (
31-07-14 10:55:05.966 csd_send_io_reply: [2.18606:2958921761] IO error 258 29466624+65536@O0001d2b6 err=6 31-07-14 10:55:05.967 csd_input_iomsg: write on error chunk 31-07-14 10:55:12.372 csd_input_iomsg: write on error chunk 31-07-14 10:55:12.424 csd_input_iomsg: write on error chunk 31-07-14 10:55:12.489 csd_input_iomsg: write on error chunk 31-07-14 10:55:12.553 csd_input_iomsg: write on error chunk 31-07-14 10:55:12.608 csd_input_iomsg: write on error chunk
pstorage top may show the corresponding CS switch between active/inactive states or be marked as 'failed' eventually.
At the same time, the server might have high LA values and high memory usage due to keeping large amount of data in file caches.
The process is no longer able to create and update files located in chunk or journal repositories, e.g. there is no proper permission to the directories/files, or the file system has been remounted in read-only mode due to errors in its journal area.
Check if this is related to broken hard disk (replace it if needed), and recreate the failed chunk server in accordance with the instructions provided in the documentation, Parallels Cloud Storage Administrator's Guide: