From: Xose Vazquez Perez <xose.vazquez@gmail.com>
To: Hannes Reinecke <hare@suse.de>,
Christophe Varoqui <christophe.varoqui@opensvc.com>,
Vincent Chen <vincent.y.chen@emc.com>,
Brian Bunker <brian@purestorage.com>
Cc: device-mapper development <dm-devel@redhat.com>
Subject: Re: [PATCH 14/15] multipath-tools: replace queue-length by default selector
Date: Thu, 11 Aug 2016 18:16:17 +0200 [thread overview]
Message-ID: <8aca22a1-73c5-a5e9-e2bd-3180e2eec564@gmail.com> (raw)
In-Reply-To: <411eb480-d21d-051b-1f7b-12631cae1f25@suse.de>
On 08/11/2016 07:58 AM, Hannes Reinecke wrote:
> On 08/10/2016 06:20 PM, Xose Vazquez Perez wrote:
>> service-time is more advanced, and it works better in asymmetric and
>> symmetric(corrected) environments.
>> - .selector = "queue-length 0",
> I would _not_ do this, unless tested on the real hardware.
> Just claiming 'the other one is more advanced' is not enough here.
service-time works better in any wild environment, different adapters or
different links speeds and any kind of load, aka the Production Environment.
I guess that manufacturers' tests are done in ideal conditions(PV=nRT).
Anyhow, the default path selector algorithm does not depend, by no means, of
any array settings or hardware. It's only related to the Linux host and
its environment.
How PURE/FlashArray and XtremIO/XtremApp were tested? Is there anything
wrong with service-time?
next prev parent reply other threads:[~2016-08-11 16:16 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-10 16:20 [PATCH 01/15] multipath-tools: identify more devices at hwtable Xose Vazquez Perez
2016-08-10 16:20 ` [PATCH 02/15] multipath-tools: remove pgpolicy=FAILOVER from Ceph/RBD Xose Vazquez Perez
2016-08-10 16:51 ` Mike Christie
2016-08-10 16:20 ` [PATCH 03/15] multipath-tools: replace (|) with [] when there is one element Xose Vazquez Perez
2016-08-10 16:20 ` [PATCH 04/15] multipath-tools: replace spaces with a regex in IBM/"3303 NVDISK" Xose Vazquez Perez
2016-08-10 16:20 ` [PATCH 05/15] multipath-tools: replace "." for real values in (COMPAQ|HP)/"(MSA|HSV)1.0" Xose Vazquez Perez
2016-08-10 16:20 ` [PATCH 06/15] multipath-tools: SGI/TP9300 is a RDAC array Xose Vazquez Perez
2016-08-10 16:20 ` [PATCH 07/15] multipath-tools: add Oracle FS to hwtable Xose Vazquez Perez
2016-08-10 16:20 ` [PATCH 08/15] multipath-tools: remove blank line at multipath.conf.5 Xose Vazquez Perez
2016-08-10 16:20 ` [PATCH 09/15] multipath-tools: standardize all RDAC devices Xose Vazquez Perez
2016-08-10 16:20 ` [PATCH 10/15] multipath-tools: delete .minio from hwtable Xose Vazquez Perez
2016-08-10 16:20 ` [PATCH 11/15] multipath-tools: add IBM/1813 - DCS3860 to hwtable Xose Vazquez Perez
2016-08-10 16:20 ` [PATCH 12/15] multipath-tools: remove patchwork reference Xose Vazquez Perez
2016-08-10 16:20 ` [PATCH 13/15] multipath-tools: document vendor, product, revision and bl_product are POSIX Extended regex Xose Vazquez Perez
2016-08-10 16:20 ` [PATCH 14/15] multipath-tools: replace queue-length by default selector Xose Vazquez Perez
2016-08-11 5:58 ` Hannes Reinecke
2016-08-11 6:52 ` Christophe Varoqui
2016-08-11 16:16 ` Xose Vazquez Perez [this message]
2016-08-10 16:20 ` [PATCH 15/15] multipath-tools: document the relation between queue_if_no_path and no_path_retry Xose Vazquez Perez
2016-08-16 7:51 ` [PATCH 01/15] multipath-tools: identify more devices at hwtable Christophe Varoqui
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