From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: device-mapper development <dm-devel@redhat.com>
Subject: Re: mirrored device with thousand of mappingtableentries
Date: Mon, 28 Feb 2011 10:01:56 -0500 [thread overview]
Message-ID: <yq1oc5wp5i3.fsf@sermon.lab.mkp.net> (raw)
In-Reply-To: <4D6BA566.1050305@redhat.com> (Zdenek Kabelac's message of "Mon, 28 Feb 2011 14:38:46 +0100")
>>>>> "Zdenek" == Zdenek Kabelac <zkabelac@redhat.com> writes:
Zdenek> If you really need that many devices - be also sure you have
Zdenek> disabled this kernel config option:
Zdenek> CONFIG_BLK_DEV_INTEGRITY
Zdenek> For some reason it consumes massive amount of memory. Other
Zdenek> than that - you should count with 64KB per device usually.
Care to qualify that?
Unless your HBA indicates that it supports data integrity the only
penalty should be that each bio grows a pointer.
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2011-02-28 15:01 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-28 11:21 mirrored device with thousand of mapping table entries Eli Malul
2011-02-28 11:48 ` Alasdair G Kergon
2011-02-28 11:59 ` mirrored device with thousand of mapping tableentries Eli Malul
2011-02-28 12:11 ` Alasdair G Kergon
2011-02-28 12:17 ` mirrored device with thousand of mappingtableentries Eli Malul
2011-02-28 13:10 ` Alasdair G Kergon
2011-02-28 13:13 ` Eli Malul
2011-02-28 13:29 ` Alasdair G Kergon
2011-02-28 13:42 ` Eli Malul
2011-02-28 16:25 ` Eli Malul
2011-02-28 13:38 ` Zdenek Kabelac
2011-02-28 15:01 ` Martin K. Petersen [this message]
2011-03-06 20:39 ` Zdenek Kabelac
2011-03-07 2:59 ` Martin K. Petersen
2011-03-07 14:24 ` Zdenek Kabelac
2011-03-07 16:09 ` Mike Snitzer
2011-03-08 6:51 ` Martin K. Petersen
2011-03-08 17:13 ` Mike Snitzer
2011-03-10 16:11 ` Martin K. Petersen
2011-03-11 16:53 ` [PATCH] block: Require subsystems to explicitly allocate bio_set integrity mempool (was: Re: mirrored device with thousand of mappingtableentries) Mike Snitzer
2011-03-11 17:11 ` [PATCH] block: Require subsystems to explicitly allocate bio_set integrity mempool Martin K. Petersen
2011-03-07 20:10 ` mirrored device with thousand of mappingtableentries Mike Snitzer
2011-03-07 20:22 ` Martin K. Petersen
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