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Re: Change sector size on existing partition

To: Brian Foster <bfoster@xxxxxxxxxx>
Subject: Re: Change sector size on existing partition
From: Dewangga Bachrul Alam <dewanggaba@xxxxxxxxxxxxxxx>
Date: Fri, 23 Jan 2015 20:46:59 +0700
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
Disposition-notification-to: Dewangga Bachrul Alam <dewanggaba@xxxxxxxxxxxxxxx>
In-reply-to: <20150123133933.GA2864@xxxxxxxxxxxxxx>
References: <54C246EC.90207@xxxxxxxxxxxxxxx> <20150123133933.GA2864@xxxxxxxxxxxxxx>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0
Hi,

The device reported like this :

$ blockdev --getss --getpbsz --getiomin --getioopt /dev/dm-3
512
4096
4096
0

Then, the sector size should be 512. Don't know why it can be 4096. :( I
will try to backup them and reformat. Any suggestion for formating on
raid-10 array? The device is 4 x 1TB drives.

On 01/23/2015 08:39 PM, Brian Foster wrote:
> On Fri, Jan 23, 2015 at 08:04:44PM +0700, Dewangga Bachrul Alam wrote:
>> Hi,
>>
>> I'm new to XFS, I have RAID-10 array with 4 disk, when I check with
>> xfs_info, the information print like this.
>>
>> $ xfs_info /var/lib/mysql
>> meta-data=/dev/mapper/vg_catalystdb01-lv_database isize=256
>> agcount=16, agsize=1600000 blks
>>          =                       sectsz=4096  attr=2, projid32bit=0
>> data     =                       bsize=4096   blocks=25600000, imaxpct=25
>>          =                       sunit=0      swidth=0 blks
>> naming   =version 2              bsize=4096   ascii-ci=0
>> log      =internal               bsize=4096   blocks=12500, version=2
>>          =                       sectsz=4096  sunit=1 blks, lazy-count=1
>> realtime =none                   extsz=4096   blocks=0, rtextents=0
>>
>> Is it possible to change `sectsz` value to 512 without re-format it? Or
>> any suggestion? I have issue with current sector size, my TokuDB
>> engines[1] can't start because of this.
>>
> 
> The only way to set things like sector size, block size, etc. is to
> reformat. I believe the default sector size is dependent on the physical
> device. You might want to report the following from your array device
> and perhaps from some or all of the member devices:
> 
> blockdev --getss --getpbsz --getiomin --getioopt <device>
> 
> Brian
> 
>> [1] https://groups.google.com/forum/#!topic/tokudb-user/kvQFJLCmKwo
>>
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