04-19-2013
[Q] zpool mirror; read from preferred vdev(s)
Hallo,
Using a zpool mirror; is there a way to set something like a primary storage / preferred vdevs / read-first devices like it was in disksuite using "metaparam -r [roundrobin | geometric | first]" or the "vxvol rdpol [prefer | round | select | siteread]" to define a preferred plex in VxVM? Will ZFS always use round-robin?
In our example we want to use a brand-new fast storage with hot-data tiering (ssd-caching) mirrored/combined to an older/slower one... with round-robin we could assume that every second read will be slower?
Will the write acknowledgement be commited after both writes so we will have no advantage from the faster storage?
Thanks in advance
- pressy
9 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
When I was using windowsXP I encountered a file manager called UltraExplorer http://www.mustangpeak.net/ultraexplorer.html that appeared really impressive.
Now in the Linux/UNIX world I was pointed towards a similar idea called 4Pane
http://www.4pane.co.uk/
I'm surprised to do a search on... (3 Replies)
Discussion started by: catch22
3 Replies
2. Solaris
I've looked a little but haven't found a solid answer, assuming there is one.
What's better, hardware mirroring or ZFS mirroring? Common practice for us was to use the raid controllers on the Sun x86 servers. Now we've been using ZFS mirroring since U6. Any performance difference? Any other... (3 Replies)
Discussion started by: Lespaul20
3 Replies
3. Solaris
Hello All,
In the output of the command "mpdcontrol -no xlist", I found that, some of the preferred paths are marked as "err". You can see the output below:
# mpdcontrol -noxlist
Unit Dev# MPD_ID/Policy DeviceName FC_AL DevMajMin IOcnt State... (0 Replies)
Discussion started by: sundar3350
0 Replies
4. Solaris
Hi ,
I am new to SVM .when i try to learn RAID 1 , first they are creating two RAID 0 strips through
metainit d51 1 1 c0t0d0s2
metainit d52 1 1 c1t0d0s2
In the next step
metainit d50 -m d51
d50: Mirror is setup
next step is
metaattach d50 d52
d50 : submirror d52 is... (7 Replies)
Discussion started by: vr_mari
7 Replies
5. AIX
Hi,
lets say we have two boot interfaces en0 en1
and two resource groups, with two service ips, sip1 and sip2, one persistent ip pers1
both persistend and service ips are applied as ip-alias
when I start the cluster, and bring the resource groups up, it looks like
en0: sip1 and sip2
... (4 Replies)
Discussion started by: funksen
4 Replies
6. IP Networking
I rotate between a static lan, dhcp lan, and various wireless networks daily. Is there a way to set preferred network connections? I use some static ip's daily, some static ip's like once a month, and almost never use the dhcp lan. The same I do with my various wireless networks. Some I use daily... (0 Replies)
Discussion started by: cokedude
0 Replies
7. Solaris
Hi all,
After being dumped in a Solaris sysadmin role, i have been trying to tidy the unpatched mess I have inherited. Part of this task is to update the current AMP stack.
The current stack is Webstack 1.5, which was current in 2009, and as far as I can see, no longer supported. Post the... (2 Replies)
Discussion started by: Sol-nova
2 Replies
8. HP-UX
what is the difference between DRD and Root Mirror Disk using LVM mirror ? (3 Replies)
Discussion started by: maxim42
3 Replies
9. Solaris
Hello,
I am upgrading Veritas from 5.1 to 6.0.1/6.0.5 in a Solaris 10 u8 server with OS mirrored (rpool) in zfs/zpool configuration.
I need to split it to have a quick way to backout in case of failure (make splitted mirror side bootable for a quick revert, like booting from it). I remember... (3 Replies)
Discussion started by: feroccimx
3 Replies
LEARN ABOUT SUSE
log::log4perl::appender::rrds
Appender::RRDs(3) User Contributed Perl Documentation Appender::RRDs(3)
NAME
Log::Log4perl::Appender::RRDs - Log to a RRDtool Archive
SYNOPSIS
use Log::Log4perl qw(get_logger);
use RRDs;
my $DB = "myrrddb.dat";
RRDs::create(
$DB, "--step=1",
"DS:myvalue:GAUGE:2:U:U",
"RRA:MAX:0.5:1:120");
print time(), "
";
Log::Log4perl->init(qq{
log4perl.category = INFO, RRDapp
log4perl.appender.RRDapp = Log::Log4perl::Appender::RRDs
log4perl.appender.RRDapp.dbname = $DB
log4perl.appender.RRDapp.layout = Log::Log4perl::Layout::PatternLayout
log4perl.appender.RRDapp.layout.ConversionPattern = N:%m
});
my $logger = get_logger();
for(10, 15, 20, 25) {
$logger->info($_);
sleep 1;
}
DESCRIPTION
"Log::Log4perl::Appender::RRDs" appenders facilitate writing data to RRDtool round-robin archives via Log4perl. For documentation on RRD
and its Perl interface "RRDs" (which comes with the distribution), check out <http://rrdtool.org>.
Messages sent to Log4perl's RRDs appender are expected to be numerical values (ints or floats), which then are used to run a "rrdtool
update" command on an existing round-robin database. The name of this database needs to be set in the appender's "dbname" configuration
parameter.
If there's more parameters you wish to pass to the "update" method, use the "rrdupd_params" configuration parameter:
log4perl.appender.RRDapp.rrdupd_params = --template=in:out
To read out the round robin database later on, use "rrdtool fetch" or "rrdtool graph" for graphic displays.
COPYRIGHT AND LICENSE
Copyright 2002-2009 by Mike Schilli <m@perlmeister.com> and Kevin Goess <cpan@goess.org>.
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.12.1 2010-02-07 Appender::RRDs(3)