Support used_for_app instead of used_for_fs
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@@ -315,7 +315,7 @@
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decrease write performance for fast disks because page cache is an overhead
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itself.
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Choose "directsync" to use [immediate_commit](layout-cluster.ru.md#immediate_commit)
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Choose "directsync" to use [immediate_commit](layout-cluster.en.md#immediate_commit)
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(which requires disable_data_fsync) with drives having write-back cache
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which can't be turned off, for example, Intel Optane. Also note that *some*
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desktop SSDs (for example, HP EX950) may ignore O_SYNC thus making
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