From: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
To: Eric Sandeen <sandeen@sandeen.net>
Cc: "xfs@oss.sgi.com" <xfs@oss.sgi.com>
Subject: Re: xfs_growfs / planned resize / performance impact
Date: Fri, 03 Aug 2012 08:09:08 +0200 [thread overview]
Message-ID: <501B6B04.2090002@profihost.ag> (raw)
In-Reply-To: <501B4D7E.1000303@sandeen.net>
Am 03.08.2012 06:03, schrieb Eric Sandeen:
> On 7/31/12 8:56 AM, Stefan Priebe - Profihost AG wrote:
>> Hello list,
>>
>> i'm planning to create a couple of VMs with just 30GB of space while using xfs as the main filesystem.
>>
>> Now i alreay know that some of the VMs will grow up to 250GB while resizing the block device and using xfs_growfs.
>>
>> Should i take care of that and format these disks with special parameters?
>>
>> I've discovered that a 500GB volume has agcount=4 and 64000 blocks of internal log - while a 300GB volume resized to 500GB has agcount 7 ad only 40960 blocks of internal log.
>>
>> Is it a problem if this grow will happen in small portions (30GB => 50GB => 75GB => 100GB => ... 300GB)?
>
> This incremental part doesn't matter a bit. The first mkfs will choose the AG count & size according to defaults;
> further growth after this will add new (possibly partial) AGs of that
pre-chosen size.
OK thanks for your reply. But does this influence performance? Should i
perhaps start creating the 30GB with agcount 1 so that while raising the
disk i don't end up with such a high agcount value? Does it make sense
to create a bigger internal log from he beginning?
Thanks
Stefan
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next prev parent reply other threads:[~2012-08-03 6:09 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-31 13:56 xfs_growfs / planned resize / performance impact Stefan Priebe - Profihost AG
2012-07-31 17:27 ` Stan Hoeppner
2012-08-03 4:03 ` Eric Sandeen
2012-08-03 6:09 ` Stefan Priebe - Profihost AG [this message]
2012-08-03 13:46 ` Eric Sandeen
2012-08-05 11:03 ` Martin Steigerwald
2012-08-05 12:34 ` Stan Hoeppner
2012-08-05 13:49 ` Martin Steigerwald
2012-08-05 20:26 ` Stan Hoeppner
2012-08-05 15:54 ` Stefan Priebe
2012-08-06 11:42 ` Michael Monnerie
2012-08-04 22:43 ` Dave Chinner
2012-08-05 5:46 ` Stefan Priebe
2012-08-05 11:06 ` Martin Steigerwald
2012-08-05 11:35 ` Andy Bennett
2012-08-05 20:57 ` Dave Chinner
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