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[Qemu-discuss] drive cache=writethrough without flushing to physical dis

From: Stanislav German-Evtushenko
Subject: [Qemu-discuss] drive cache=writethrough without flushing to physical disks OR drive cache=none with readonly host cache
Date: Mon, 24 Feb 2014 17:15:47 +0400


As I understand so far:
- cache=writethrough - uses host cache readonly and flushes all data to disks directly (avoid RAID cache)
- cache=none - doesn't use host cache at all and written data goes to the RAID cache (if one exists)

However there is no such a cache mode that lie in between:
- uses host cache for reading and RAID cache for writing (without writing to host cache)

Is there any reason not to have such a cache or am I missing something?

Best regards,

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