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Re: irregular mkfs.xfs results on identical HW

To: "Gamel Anton J." <anton.gamel@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: irregular mkfs.xfs results on identical HW
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Fri, 26 Sep 2014 07:19:01 +1000
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <54247484.2030808@xxxxxxxxxxxxxxxxxxxxxx>
References: <54247484.2030808@xxxxxxxxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Thu, Sep 25, 2014 at 10:01:08PM +0200, Gamel Anton J. wrote:
> Dear all,
> 
> servers with identical disk setup (HW RAID0 H310a):
> 
> Disk /dev/sda: 598.9 GB, 598879502336 bytes
> /dev/sda1               1       49152   394813439+  82  Linux swap / Solaris
> /dev/sda2           49153       50176     8225280   83  Linux
> /dev/sda3            6399       72809   533446357+  44  Unknown
> 
> mkfs.xfs creates on 28 of them:
> meta-data=/dev/sda3              isize=256    agcount=16, agsize=8335099 blks
>          =                       sectsz=512   attr=1, projid32bit=0
> data     =                       bsize=4096   blocks=133361584, imaxpct=25
>          =                       sunit=0      swidth=0 blks
> naming   =version 2              bsize=4096   ascii-ci=0
> log      =internal               bsize=4096   blocks=32768, version=1
>          =                       sectsz=512   sunit=0 blks, lazy-count=1
> realtime =none                   extsz=4096   blocks=0, rtextents=0

THat's clearly an old version of mkfs - it's selected version 1 logs
and attr1 by default and a log size of only 128MB. mkfs.xfs has
defaulted to v2 logs since 3.0.0 (2007).

> but on four out of them:
> meta-data=/dev/sda3              isize=256    agcount=4, agsize=33340398 blks
>          =                       sectsz=512   attr=2, projid32bit=0
> data     =                       bsize=4096   blocks=133361589, imaxpct=25
>          =                       sunit=0      swidth=0 blks
> naming   =version 2              bsize=4096   ascii-ci=0
> log      =internal               bsize=4096   blocks=65117, version=2
>          =                       sectsz=512   sunit=0 blks, lazy-count=1
> realtime =none                   extsz=4096   blocks=0, rtextents=0

Clearly much newer - attr2, log v2, log larger than 128MB...

mkfs.xfs -V on each of the nodes will tell you that they are running
different versions of mkfs, I think.

> The only way it worked was to dump nodeA:/dev/sda3 to nodeB:/dev/sda3
> Is there an explanation? May be I missed something ... hints?

If you are building a new storage system, then I'd highly recommend
all the nodes run the same software and that software is the newest
possible release you can get....

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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