Hi George,
Please run "mkdir ./mirrored/" first, then run "lfs mirror create":
# mkdir ./mirrored/
# lfs mirror create -N2 ./mirrored/
# lfs getstripe ./mirrored/
./mirrored/
lcm_layout_gen: 0
lcm_mirror_count: 2
lcm_entry_count: 2
lcme_id: N/A
lcme_mirror_id: N/A
lcme_flags: 0
lcme_extent.e_start: 0
lcme_extent.e_end: EOF
stripe_count: 1 stripe_size: 1048576 pattern: raid0
stripe_offset: -1
lcme_id: N/A
lcme_mirror_id: N/A
lcme_flags: 0
lcme_extent.e_start: 0
lcme_extent.e_end: EOF
stripe_count: 1 stripe_size: 1048576 pattern: raid0
stripe_offset: -1
--
Best regards,
Jian Yu
-----Original Message-----
From: lustre-discuss <[email protected]> on behalf of
George Melikov <[email protected]>
Date: Friday, September 28, 2018 at 8:05 AM
To: lustre-discuss <[email protected]>
Subject: [lustre-discuss] lfs mirror create directory
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" <[email protected]>:
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 <[email protected]> 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 <[email protected]>
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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