[lustre-discuss] lfs mirror create directory

[George Melikov]

Does `lfs mirror create` work for directories in 2.11?

Tried it, nope :(

 

# lfs mirror create -N2 ./mirrored/
lfs mirror create: cannot create composite file './mirrored/': Is a directory

 

But documentation says it's good to go...

> lfs mirror create <--mirror-count|-N[mirror_count]
> [setstripe_options|[--flags<=flags>]]> ... <filename|directory>

 

 

____________________________________
Sincerely,
George Melikov,

 

 

 

28.09.2018, 11:21, "Andreas Dilger" <adil...@whamcloud.com>:

It is best to leave the MDT recordsize at the default. For most files it will not matter (too small), but for Data on MDT you also don't want a large recordsize. 
 

Cheers, Andreas

On Sep 28, 2018, at 09:17, Robert Redl <robert.r...@lmu.de> wrote:
 

Dear All,

I have a related question. The documentation says nothing about the recommended recordsize for MDTs with ZFS backend. Are there any recommendation? Or is data on MDTs stored in a way that the recordsize does not matter?

Thanks,
Robert

 

On 09/28/2018 12:54 AM, Andreas Dilger wrote:

Firstly, we don't test anything larger than 1MB.

 

Secondly, the best recordsize is up to the apication IO pattern. If it is streaming writes, it might be OK. If it is random write then probably not. 
 

Cheers, Andreas

On Sep 27, 2018, at 19:04, Riccardo Veraldi <riccardo.vera...@cnaf.infn.it> wrote:
 

Hello,

I have always been using ZFS record size to 1MB with Lustre on top of ZFS.  Anyway it is possible to set it to more than 1MB. May this have any benefit in performance and is it recommended to set for example:

echo 4194304 > /sys/module/zfs/parameters/zfs_max_recordsize

zfs set recordsize=4m zpool

Thank you.

Rick

 

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