| Headlines |
| 2019-11-26 |
How to detect bit rot on RHEL |
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Bit rot is the term given to a situation where data written to a storage drive, like a hard drive, gets corrupted or changed before it is read back from the disk. This can happen due to physical issues with the disk or environmental concerns. Some modern filesystems, such as Btrfs and ZFS, try to detect and, in some cases, repair bit rot automatically. Red Hat Enterprise Linux is one of the few big-named distributions which does not support either of these advanced filesystems and this raises the issue of how administrators can detect and manage bit rot. Red Hat has published an article on what bit rot is and how to deal with it on the company's blog. "By definition, with bit rot we are getting different data from the block device than we wrote. Thus, if an application like a database is using the block device directly without a filesystem layer, then it would have to deal by itself with bit rot. Let's look at bit rot on a block device with XFS, the default filesystem on RHEL 7 and RHEL 8. Instead of using a real hard disk and waiting for bit rot, we will change a single bit, to simulate bit rot." |
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