2012-01-11 1:26, Jim Klimov пишет:
To follow on the subject of VDEV caching, even if
only of metadata, in oi_148a, I have found the
disabling entry in /etc/system of the LiveUSB:
set zfs:zfs_vdev_cache_size=0
Now that I have the cache turned on and my scrub
continues, cache efficiency so far
To follow on the subject of VDEV caching, even if
only of metadata, in oi_148a, I have found the
disabling entry in /etc/system of the LiveUSB:
set zfs:zfs_vdev_cache_size=0
Now that I have the cache turned on and my scrub
continues, cache efficiency so far happens to be
75%. Not bad for a
On 01/08/12 20:10, Jim Klimov wrote:
Is it true or false that: ZFS might skip the cache and
go to disks for streaming reads?
I don't believe this was ever suggested. Instead, if
data is not already in the file system cache and a
large read is made from disk should the file system
put this
Thanks for the replies, some more questions follow.
Your answers below seem to contradict each other somewhat.
Is it true that:
1) VDEV cache before b70 used to contain a full copy
of prefetched disk contents,
2) VDEV cache since b70 analyzes the prefetched sectors
and only keeps metadata
On 01/08/12 10:15, John Martin wrote:
I believe Joerg Moellenkamp published a discussion
several years ago on how L1ARC attempt to deal with the pollution
of the cache by large streaming reads, but I don't have
a bookmark handy (nor the knowledge of whether the
behavior is still accurate).
2012-01-09 18:15, John Martin пишет:
On 01/08/12 20:10, Jim Klimov wrote:
Is it true or false that: ZFS might skip the cache and
go to disks for streaming reads?
(The more I think
about it, the more senseless this sentence seems, and
I might have just mistaken it with ZIL writes of bulk
From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
boun...@opensolaris.org] On Behalf Of Jim Klimov
I wonder if it is possible (currently or in the future as an RFE)
to tell ZFS to automatically read-ahead some files and cache them
in RAM and/or L2ARC?
One use-case would be
On 01/08/12 09:30, Edward Ned Harvey wrote:
In the case of your MP3 collection... Probably the only thing you can do is
to write a script which will simply go read all the files you predict will
be read soon. The key here is the prediction - There's no way ZFS or
solaris, or any other OS in
2012-01-08 19:15, John Martin пишет:
On 01/08/12 09:30, Edward Ned Harvey wrote:
In the case of your MP3 collection... Probably the only thing you can
do is
to write a script which will simply go read all the files you predict
will
be read soon. The key here is the prediction - There's no way
On 01/08/12 11:30, Jim Klimov wrote:
However for smaller servers, such as home NASes which have
about one user overall, pre-reading and caching files even
for a single use might be an objective per se - just to let
the hard-disks spin down. Say, if I sit down to watch a
movie from my NAS, it is
2012-01-09 0:29, John Martin пишет:
On 01/08/12 11:30, Jim Klimov wrote:
However for smaller servers, such as home NASes which have
about one user overall, pre-reading and caching files even
for a single use might be an objective per se - just to let
the hard-disks spin down. Say, if I sit
On Jan 7, 2012, at 8:59 AM, Jim Klimov wrote:
I wonder if it is possible (currently or in the future as an RFE)
to tell ZFS to automatically read-ahead some files and cache them
in RAM and/or L2ARC?
See discussions on the ZFS intelligent prefetch algorithm. I think Ben
Rockwood's
description
2012-01-09 4:14, Richard Elling пишет:
On Jan 7, 2012, at 8:59 AM, Jim Klimov wrote:
I wonder if it is possible (currently or in the future as an RFE)
to tell ZFS to automatically read-ahead some files and cache them
in RAM and/or L2ARC?
See discussions on the ZFS intelligent prefetch
On Jan 8, 2012, at 5:10 PM, Jim Klimov wrote:
2012-01-09 4:14, Richard Elling пишет:
On Jan 7, 2012, at 8:59 AM, Jim Klimov wrote:
I wonder if it is possible (currently or in the future as an RFE)
to tell ZFS to automatically read-ahead some files and cache them
in RAM and/or L2ARC?
See
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