Wojciech,
1. I can't suggest an optimal size, It really need not be a a really
big disk as the only information that is stored on the MGS is the
configuration data. So a single smallest disk that you can get should
be fine (36G)
2. I always recommend to have a raid 1 for MGS it always helps in
keeping those uptime numbers up. Since the lustre servers would cache
their configurations once they have been added once, they would work
even if the MGS is down.
3. This is something that I will have to try before i can give you
the steps, I will mail you the steps once i have tested them. I think
this should be possible by just backing up the lustre configuration
in a csv file of the configuration and then use it to generate the
config (without using the --reformat option, i think).
Thanks
Anand
On Aug 17, 2007, at 11:05 AM, Wojciech Turek wrote:
Hi,
Thanks for you answers. Please let me ask another questions.
1) Are there any recommendations regarding size of block device
for mgs ?
2) Also do I need to have any raid configuration for mgs block device.
3) If I would lost mgs device what are the steps to recreate it and
get access to filesystem
Thanks You
Wojciech
On 17 Aug 2007, at 17:37, Anand Bisen wrote:
Wojciech,
For question 2: it's a typo. it should be /dev/sda1 and not /dev/
sda (or if you are using the whole device then vice versa, both
would work).
For question 1: I think either the MGS should be on a separate
machine and if MDT and MGS are co-located on a single node, i
don't think it would make a big difference if they are on
different partitions (sda1, sda2) or not. Although depending upon
the total number of client's and their frequency of mount's/
umount's it might help keeping those IO's on a different block
device (sda, sdb).
Thanks
Anand
On Aug 17, 2007, at 8:11 AM, Wojciech Turek wrote:
On 17 Aug 2007, at 16:04, Wojciech Turek wrote:
Hi,
I have two short questions:
1) Is it better to configure MGS on different partition then MDT?
For example:
I have node01 which has two partitions /dev/sda1 and /dev/sda2
I am planning to create MGS on /dev/sda1 and MDT on /dev/sda2
2) If above is actually possible? I read in manual follwing:
3 Start Lustre on the MGS node.
$ mkfs.lustre --mgs /dev/sda
4 Make a mount point on MGS for the file system and mount it.
$ mkdir -p /mnt/mgs
$ mount -t lustre /dev/sda1 /mnt/mgs
It looks like I will have to create mgs on entire device /dev/
sda and then mount it using /dev/sda1 Is that right or typo?
Regards
Wojciech Turek
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Mr Wojciech Turek
Assistant System Manager
University of Cambridge
High Performance Computing service
email: [EMAIL PROTECTED]
tel. +441223763517
---
Anand Bisen
Sr. Systems Architect, DataDirect Networks
9351 Deering Avenue, Chatsworth, CA 91311
Tel: 818-700-4053 Fax: 818-700-7665
Cell: 818-723-9752
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