[OmniOS-discuss] Fwd: [developer] Heads-up: 6950 ARC should cache compressed data

[Dan McDonald]

The most recent bloody update has this feature.  Bloody users should read below.

Dan


> Begin forwarded message:
> 
> From: "George Wilson" <george.wilson at delphix.com>
> Subject: [developer] Heads-up: 6950 ARC should cache compressed data
> Date: July 14, 2016 at 3:57:13 PM EDT
> To: "<developer at lists.illumos.org>" <developer at lists.illumos.org>
> Reply-To: developer at lists.illumos.org
> 
> The compressed ARC feature has just integrated into illumos. This feature introduces compression into the ZFS cache and will keep blocks compressed in memory if they are compressed on disk. Blocks will be decompressed on demand and the uncompressed copy will be discarded once the consumer is no longer referencing it. Users can disable the compressed ARC feature by doing the following:
> 
> mdb -ke "zfs_compressed_arc_enabled/W 0"
> 
> This can be done dynamically and will only impact newly cached blocks. Blocks already in the cache will remain compressed until they are evicted. 
> 
> This feature also include a 100MB (by default) dbuf cache which keep blocks uncompressed that are recently accessed.
> 
> You can adjust the default value of the dbuf cache by doing the following:
> 
> mdb -ke "dbuf_cache_max_bytes/Z 0t209715200" /* 200MB dbuf cache */
> 
> For more information you can check out the slides on open-zfs.org <http://postlink.www.listbox.com/2166757/3affccb54cf4be1589fb8cea18eeda1a/21175029/47b6a23e?uri=aHR0cDovL29wZW4temZzLm9yZw> located here: 
> 
> http://goo.gl/Ra4fw9 <http://postlink.www.listbox.com/2166758/4a0070dc45fa6e9f739152f11e35726e/21175029/47b6a23e?uri=aHR0cHM6Ly9nb28uZ2wvUmE0Znc5>
> 
> Please contact me if you have any questions.
> 
> Enjoy,
> George
> 
> 
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