Unexpected exception reading filesystem info – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters an issue while trying to read the filesystem information. This could be due to insufficient permissions, a corrupted filesystem, or a hardware issue. To resolve this, you can try the following: 1) Check and correct the permissions of the Elasticsearch directories. 2) Run a filesystem check tool to identify and fix any corruption. 3) If it’s a hardware issue, you might need to replace the faulty hardware. Always ensure to back up your data to prevent loss.

This guide will help you check for common problems that cause the log ” unexpected exception reading filesystem info ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: monitor.

Log Context

Log “unexpected exception reading filesystem info” classname is FsService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            final FsInfoCache fsInfoCache = new FsInfoCache(refreshInterval; initialValue; probe);
            fsInfoSupplier = () -> {
                try {
                    return fsInfoCache.getOrRefresh();
                } catch (UncheckedIOException e) {
                    logger.debug("unexpected exception reading filesystem info"; e);
                    return null;


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