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man: document the limits of the block device discovery for IO cgroup options 

Fixes: #14271
This commit is contained in:
Lennart Poettering 2020-01-16 16:29:01 +01:00
parent 1e8a7eff22
commit f27a21d48b
1 changed files with 14 additions and 0 deletions
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14
man/systemd.resource-control.xml
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@ -462,6 +462,14 @@
<para>This setting replaces <varname>BlockIODeviceWeight=</varname> and disables settings prefixed with
<varname>BlockIO</varname> or <varname>StartupBlockIO</varname>.</para>
<para>The specified device node should reference a block device that has an I/O scheduler
associated, i.e. should not refer to partition or loopback block devices, but to the originating,
physical device. When a path to a regular file or directory is specified it is attempted to
discover the correct originating device backing the file system of the specified path. This works
correctly only for simpler cases, where the file system is directly placed on a partition or
physical block device, or where simple 1:1 encryption using dm-crypt/LUKS is used. This discovery
does not cover complex storage and in particular RAID and volume management storage devices.</para>
</listitem>
</varlistentry>
@ -486,6 +494,8 @@
<para>These settings replace <varname>BlockIOReadBandwidth=</varname> and
<varname>BlockIOWriteBandwidth=</varname> and disable settings prefixed with <varname>BlockIO</varname> or
<varname>StartupBlockIO</varname>.</para>
<para>Similar restrictions on block device discovery as for <varname>IODeviceWeight=</varname> apply, see above.</para>
</listitem>
</varlistentry>
@ -509,6 +519,8 @@
<para>These settings are supported only if the unified control group hierarchy is used and disable settings
prefixed with <varname>BlockIO</varname> or <varname>StartupBlockIO</varname>.</para>
<para>Similar restrictions on block device discovery as for <varname>IODeviceWeight=</varname> apply, see above.</para>
</listitem>
</varlistentry>
@ -528,6 +540,8 @@
<para>Implies <literal>IOAccounting=yes</literal>.</para>
<para>These settings are supported only if the unified control group hierarchy is used.</para>
<para>Similar restrictions on block device discovery as for <varname>IODeviceWeight=</varname> apply, see above.</para>
</listitem>
</varlistentry>