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Re: Performance Characteristics of All Linux RAIDs (mdadm/bonnie++)
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From:
Justin Piszcz <jpiszcz@...>
To: Kasper Sandberg <lkml@...>
Cc: Chris Snook <csnook@...>, <linux-kernel@...>, <linux-raid@...>, <xfs@...>
Subject:
Re: Performance Characteristics of All Linux RAIDs (mdadm/bonnie++)
Date: Thursday, May 29, 2008 - 5:08 pm
On Thu, 29 May 2008, Kasper Sandberg wrote:
quoted text
> On Wed, 2008-05-28 at 15:27 -0400, Justin Piszcz wrote: >> >> On Wed, 28 May 2008, Chris Snook wrote: >> >>> Justin Piszcz wrote: >>>> >>>> >>>> On Wed, 28 May 2008, Chris Snook wrote: >>>> >>>>> Justin Piszcz wrote: >>>>>> Hardware: >>>>>> >>>>> Given that one of the greatest benefits of NCQ/TCQ is with parity RAID, >>>>> I'd be fascinated to see how enabling NCQ changes your results. Of >>>>> course, you'd want to use a single SATA controller with a known good NCQ >>>>> implementation, and hard drives known to not do stupid things like disable >>>>> readahead when NCQ is enabled. >>>> Only/usually on multi-threaded jobs/tasks, yes? >>> >>> Generally, yes, but there's caching and readahead at various layers in >>> software that can expose the benefit on certain single-threaded workloads as >>> well. >>> >>>> Also, I turn off NCQ on all of my hosts that has it enabled by default >>>> because >>>> there are many bugs that occur when NCQ is on, they are working on it in >>>> the >>>> libata layer but IMO it is not safe at all for running SATA disks w/NCQ as >>>> with it on I have seen drives drop out of the array (with it off, no >>>> problems). >>>> >>> >>> Are you using SATA drives with RAID-optimized firmware? Most SATA >>> manufacturers have variants of their drives for a few dollars more that have >>> firmware that provides bounded latency for error recovery operations, for >>> precisely this reason. >> I see--however, as I understood it there were bugs utilizing NCQ in libata? > You wouldnt happen to have some more information about this? i havent > personally had problems yet, but i havent used it for very long - but > since it comes activated by DEFAULT, i would assume it to be relatively > stable?
Not off-hand, check LKML and my email address from early this year or last year and/or the ide-list. Justin. --
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Messages in current thread:
Performance Characteristics of All Linux RAIDs (mdadm/bonnie...
, Justin Piszcz
, (Wed May 28, 4:53 am)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Holger Kiehl
, (Thu May 29, 2:44 am)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Justin Piszcz
, (Thu May 29, 1:02 pm)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Bill Davidsen
, (Fri May 30, 8:55 am)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Keld
, (Fri May 30, 10:23 am)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Justin Piszcz
, (Thu May 29, 8:06 am)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Bill Davidsen
, (Wed May 28, 7:09 pm)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Michal Soltys
, (Thu May 29, 2:37 am)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Keld
, (Wed May 28, 3:02 pm)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Justin Piszcz
, (Wed May 28, 3:05 pm)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Jens Bäckman
, (Wed May 28, 12:34 pm)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Alan Cox
, (Wed May 28, 2:57 pm)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Bill Davidsen
, (Wed May 28, 7:00 pm)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Alan Cox
, (Thu May 29, 7:22 am)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Bill Davidsen
, (Fri May 30, 8:22 am)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Justin Piszcz
, (Wed May 28, 1:33 pm)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Bryan Mesich
, (Wed May 28, 12:46 pm)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Chris Snook
, (Wed May 28, 12:40 pm)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Chris Snook
, (Wed May 28, 11:40 am)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Justin Piszcz
, (Wed May 28, 1:32 pm)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Chris Snook
, (Wed May 28, 3:22 pm)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Justin Piszcz
, (Wed May 28, 3:27 pm)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Kasper Sandberg
, (Thu May 29, 5:57 am)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Justin Piszcz
, (Thu May 29, 5:08 pm)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Justin Piszcz
, (Wed May 28, 1:53 pm)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Peter Rabbitson
, (Wed May 28, 6:54 am)
Re: Performance Characteristics of All Linux RAIDs (mdadm/bo...
, Justin Piszcz
, (Wed May 28, 7:05 am)
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