Displaying 20 results from an estimated 3000 matches similar to: "in-kernel gzip compression"
2007 Jul 05
17
ZFS Compression algorithms - Project Proposal
Bellow, follows a proposal for a new opensolaris project. Of course,
this is open to change since I just wrote down some ideas I had months
ago, while researching the topic as a graduate student in Computer
Science, and since I''m not an opensolaris/ZFS expert at all. I would
really appreciate any suggestion or comments.
PROJECT PROPOSAL: ZFS Compression Algorithms.
The main purpose of
2006 Jan 04
8
Using same ZFS under different kernel versions
I build two zfs filesystems using b29 (from brandz).
I then re-installed solaris express b28, preserving the zfs filesystems.
When I tried to "zpool import" my zfs filesystems I got a kernel panic:
> debugging crash dump vmcore.0 (32-bit) from blackbird
> operating system: 5.11 snv_28 (i86pc)
> panic message:
> ZFS: bad checksum (read on /dev/dsk/c1d0p0 off 24d5e000: zio
2009 Feb 02
8
ZFS core contributor nominations
The time has come to review the current Contributor and Core contributor
grants for ZFS. Since all of the ZFS core contributors grants are set
to expire on 02-24-2009 we need to renew the members that are still
contributing at core contributor levels. We should also add some new
members to both Contributor and Core contributor levels.
First the current list of Core contributors:
Bill
2007 Apr 18
33
LZO compression?
Hi,
I don''t know if this has been discussed before, but have you thought
about adding LZO compression to ZFS?
One zfs-fuse user has provided a patch which implements LZO compression,
and he claims better compression ratios *and* better speed than lzjb.
The miniLZO library is licensed under the GPL, but the author
specifically says that other licenses are available by request.
Has this
2010 Feb 19
4
ZFS unit of compression
Hello.
I want to know what is the unit of compression in ZFS. Is it 4 KB or larger? Is it tunnable?
Thanks.
Thanos
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2007 Mar 28
20
Gzip compression for ZFS
Adam,
With the blog entry[1] you''ve made about gzip for ZFS, it raises
a couple of questions...
1) It would appear that a ZFS filesystem can support files of
varying compression algorithm. If a file is compressed using
method A but method B is now active, if I truncate the file
and rewrite it, is A or B used?
2) The question of whether or not to use bzip2 was raised in
the
2012 Feb 09
1
implementing flac on an embedded device
Hi everyone,
I'm currently working on project trying to send sensor data from a
microcontroller over radio to another device.
I need compression because the radio has not enough bandwidth to send it
without.
Because the sensor data quiet much resembles audio data I got the best
compression results using lossless audio codecs instead of data
compression algorithms like Lempel-Ziv.
I
2008 Apr 29
24
recovering data from a dettach mirrored vdev
Hi,
my system (solaris b77) was physically destroyed and i loosed data saved in a zpool mirror. The only thing left is a dettached vdev from the pool. I''m aware that uberblock is gone and that i can''t import the pool. But i still hope their is a way or a tool (like tct http://www.porcupine.org/forensics/) i can go too recover at least partially some data)
thanks in advance for
2013 Jul 19
2
9.2PRERELEASE ZFS panic in lzjb_compress
Hi,
Running 9.2-PRERELEASE #19 r253313 I got the following panic
Fatal trap 12: page fault while in kernel mode
cpuid = 22; apic id = 46
fault virtual address = 0xffffff827ebca30c
fault code = supervisor read data, page not present
instruction pointer = 0x20:0xffffffff81983055
stack pointer = 0x28:0xffffffcf75bd60a0
frame pointer = 0x28:0xffffffcf75bd68f0
2006 Jul 29
1
zfs discussion forum bug
I started three new threads recently,
"Feature proposal: differential pools"
"Feature proposal: trashcan via auto-snapshot with every txg commit"
"Flushing synchronous writes to mirrors"
Matthew Ahrens and Henk Langeveld both replied to my first thread by sending their messages to both me and to zfs-discuss at opensolaris.org, and Matt did likewise for my second
2006 Jun 12
3
zfs destroy - destroying a snapshot
Hello zfs-discuss,
I''m writing a script to do automatically snapshots and destroy old
one. I think it would be great to add to zfs destroy another option
so only snapshots can be destroyed. Something like:
zfs destroy -s SNAPSHOT
so if something other than snapshot is provided as an argument
zfs destroy wouldn''t actually destroy it.
That way it would
2009 Aug 14
6
LZO versus LZJB
Hi
Some developers here said a long time ago that someone should show
the code for LZO compression support for ZFS before talking about the
next step. I made that code with a friend and we also made a little
benchmark to give a first impression:
http://denisy.dyndns.org/lzo_vs_lzjb/
I hope we made no technical error, but if you find something
not accurate, we will correct it.
Denis
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This
2007 May 02
41
gzip compression throttles system?
I just had a quick play with gzip compression on a filesystem and the
result was the machine grinding to a halt while copying some large
(.wav) files to it from another filesystem in the same pool.
The system became very unresponsive, taking several seconds to echo
keystrokes. The box is a maxed out AMD QuadFX, so it should have plenty
of grunt for this.
Comments?
Ian
2006 May 19
11
tracking error to file
In my testing, I''ve found the following error:
zpool status -v
pool: local
state: ONLINE
status: One or more devices has experienced an error resulting in data
corruption. Applications may be affected.
action: Restore the file in question if possible. Otherwise restore the
entire pool from backup.
see: http://www.sun.com/msg/ZFS-8000-8A
scrub: none requested
2007 Nov 24
19
R/W lock portability issue
Hi,
I am having a problem porting Solaris R/W lock functionality to Linux.
The problem is that RW_LOCK_HELD() doesn''t have an equivalent function
in pthreads.
This was not a problem before because RW_LOCK_HELD() was only used in
ASSERT statements. In this case, I was able to make it work by making it
behave a bit differently (specifically, it would return true if *any*
thread was
2007 Feb 21
12
suggestion: directory promotion to filesystem
Not sure how technically feasible it is, but something I thought of while shuffling some files around my home server. My poor understanding of ZFS internals is that the entire pool is effectivly a tree structure, with nodes either being data or metadata. Given that, couldnt ZFS just change a directory node to a filesystem with little effort, allowing me do everything ZFS does with filesystems on
2009 Jun 15
33
compression at zfs filesystem creation
Hi,
I just installed 2009.06 and found that compression isn''t enabled by default when filesystems are created. Does is make sense to have an RFE open for this? (I''ll open one tonight if need be.) We keep telling people to turn on compression. Are there any situations where turning on compression doesn''t make sense, like rpool/swap? what about rpool/dump?
Thanks,
~~sa
2010 Jan 02
27
Pool import with failed ZIL device now possible ?
Hello list,
someone (actually neil perrin (CC)) mentioned in this thread:
http://mail.opensolaris.org/pipermail/zfs-discuss/2009-December/034340.html
that is should be possible to import a pool with failed log devices
(with or without data loss ?).
>/
/>/ Has the following error no consequences?
/>/
/>/ Bug ID 6538021
/>/ Synopsis Need a way to force pool startup when
2008 Jul 02
14
is it possible to add a mirror device later?
Ciao,
the rot filesystem of my thumper is a ZFS with a single disk:
bash-3.2# zpool status rpool
pool: rpool
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
c5t0d0s0 ONLINE 0 0 0
spares
c0t7d0 AVAIL
c1t6d0 AVAIL
c1t7d0
2010 Jul 20
16
zfs raidz1 and traditional raid 5 perfomrance comparision
Hi,
for zfs raidz1, I know for random io, iops of a raidz1 vdev eqaul to one physical disk iops, since raidz1 is like raid5 , so is raid5 has same performance like raidz1? ie. random iops equal to one physical disk''s ipos.
Regards
Victor
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