Question

使用Directio时，如果具有多个具有不同扇区大小的安装点，Nginx无法读取文件。

我们的服务器在Nginx的根文件夹下安装了不同的硬盘。我们所有的旧磁盘的扇区大小均为512，当我们更换磁盘时，Nginx突然无法从该磁盘读取文件。

服务器上似乎没有什么问题，我们可以毫无问题地列出/读取文件，但是Nginx不能。在error_log中向客户端发送响应时显示失败（22：无效参数）。

[crit] pread() "/str/.../dsf13at.mp4" failed (22: Invalid argument) while sending response to client
[crit] pread() "/str/.../dsf13at.mp4" failed (22: Invalid argument) while sending response to client
[crit] pread() "/str/.../dsf13at.mp4" failed (22: Invalid argument) while sending response to client
[crit] pread() "/str/.../dsf13at.mp4" failed (22: Invalid argument) while sending response to client
[crit] pread() "/str/.../dsf13at.mp4" failed (22: Invalid argument) while sending response to client
[crit] pread() "/str/.../dsf13at.mp4" failed (22: Invalid argument) while sending response to client
[crit] pread() "/str/.../dsf13at.mp4" failed (22: Invalid argument) while sending response to client
[crit] pread() "/str/.../dsf13at.mp4" failed (22: Invalid argument) while sending response to client

硬盘信息

具有512个硬盘的硬盘

Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

具有4096的新硬盘驱动器

Units = sectors of 1 * 4096 = 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Answer 1

问题在于Nginx使用的directio_alignment为512，但是当硬盘驱动器的扇区大小为4096时似乎不起作用。

将 directio_alignment 设置为4k可解决该问题，并且Nginx现在可以从具有512和4096扇区的驱动器中读取数据。

Nginx配置：

aio threads;
aio_write on;
directio 8M;
directio_alignment 4k;

如何解决“向客户端发送响应时失败（22：无效参数）”

1 个答案: