AWS efs documentation change
Summary
Removed a troubleshooting section about 'Slow reads after renaming files (NFSv4 attribute cache issue)' and updated recommended kernel versions from 5.10.245-243 to 4.3 for Amazon Linux 2 and from 2023 to 2015.09 for Amazon Linux.
Security assessment
The changes involve removing a known bug description and lowering the recommended kernel version. While this could impact performance and stability, there is no evidence in the diff that this change addresses a security vulnerability. The removal of the bug section suggests the issue may be resolved or no longer relevant, but it is not framed as a security fix.
Diff
diff --git a/efs/latest/ug/troubleshooting-efs-general.md b/efs/latest/ug/troubleshooting-efs-general.md index 56e422a36..40d7c6188 100644 --- a//efs/latest/ug/troubleshooting-efs-general.md +++ b//efs/latest/ug/troubleshooting-efs-general.md @@ -5 +5 @@ -Slow reads after renaming files (NFSv4 attribute cache issue)Unable to create an EFS file systemAccess denied to allowed files on NFS file systemErrors when accessing the Amazon EFS consoleAmazon EC2 instance hangsApplication writing large amounts of data hangsPoor performance when opening many files in parallelCustom NFS settings causing write delaysCreating backups with Oracle Recovery Manager is slow +Unable to create an EFS file systemAccess denied to allowed files on NFS file systemErrors when accessing the Amazon EFS consoleAmazon EC2 instance hangsApplication writing large amounts of data hangsPoor performance when opening many files in parallelCustom NFS settings causing write delaysCreating backups with Oracle Recovery Manager is slow @@ -11 +11 @@ In general, if you encounter issues with Amazon EFS that you have trouble resolv - * Amazon Linux 2 with kernel 5.10.245-243 or newer + * Amazon Linux 2 with kernel 4.3 or newer @@ -13 +13 @@ In general, if you encounter issues with Amazon EFS that you have trouble resolv - * Amazon Linux 2023 or newer + * Amazon Linux 2015.09 or newer @@ -26 +26 @@ In general, if you encounter issues with Amazon EFS that you have trouble resolv -If you are using another distribution or a custom kernel, we recommend kernel version 5.10.245-243 or newer. +If you are using another distribution or a custom kernel, we recommend kernel version 4.3 or newer. @@ -30 +30 @@ If you are using another distribution or a custom kernel, we recommend kernel ve -You may experience slower than normal read performance after renaming files on your EFS file system when using NFSv4 due to Slow reads after renaming files (NFSv4 attribute cache issue). +RHEL 6.9 might be suboptimal for certain workloads due to Poor performance when opening many files in parallel. @@ -34,2 +33,0 @@ You may experience slower than normal read performance after renaming files on y - * Slow reads after renaming files (NFSv4 attribute cache issue) - @@ -55,33 +52,0 @@ You may experience slower than normal read performance after renaming files on y -## Slow reads after renaming files (NFSv4 attribute cache issue) - -You may experience slower than normal read performance after renaming files on your EFS file system when using NFSv4. This is caused by improper attribute cache handling in the Linux kernel, which results in excessive GETATTR operations for renamed files. - -**Kernel versions with this bug** - -Amazon Linux 2: - - * kernel-5.10.242-239.961.amzn2 - - * kernel-5.10.244-240.965.amzn2 - - * kernel-5.10.244-240.970.amzn2 - - * kernel-5.10.245-241.976.amzn2 - - * kernel-5.10.245-241.978.amzn2 - - - - -**Action to take** - -Update your kernel to the latest version. For Amazon Linux 2, kernel version kernel-5.10.245-243.979.amzn2 or later contains the fix. - -For Amazon Linux 2, run the following commands: - - - sudo yum -y install latest version - sudo reboot - -For other Linux distributions, check with your distribution vendor for kernel updates that address this NFSv4 attribute cache issue. -