Ljubomir Ljubojevic wrote:
On 05/07/2014 05:31 PM, CS_DBA wrote:
Thanks for the advice, can someone point me to a good step by step how
to per setting up a RAID 10 volume per the parted & GPT tools?
You might find this usefull, text on official CentOS Facebook group. GPT
is separate from RAID's, so GPT is not covered, but RAID part should be the same:
https://www.facebook.com/notes/centos/software-raid-on-rhel-6/10151254589767...
Original text is here: https://linux.dell.com/files/whitepapers/Software_RAID_on_Red_Hat_Enterprise...
For RAID10 I suggest far 2, and boot regular raid1
Creating Boot RAID1: [root@kancelarija]# mdadm --create /dev/md9 --level=1 --raid-disks=2
/dev/sdd1 /dev/sde1 --metadata=0.90
Creating RAID10 far,2:
[root@kancelarija]# mdadm --create /dev/md9 --level=10 --layout=f2
--raid-disks=2 /dev/sdd9 /dev/sde9
We have a good bit of RAID here, and GPT, with all the 3TB drives we got last year. We've added stuff in our kickstart script to partition with GPT and parted (fdisk doesn't do GPT, if you'd missed that). In the ks, we mklabel GPT, then do NOT clear partitioning when you go to create partitions, or it'll blow away the GPT.
Also, my manager is very much not a fan of LVM, but we do have *large* RAIDs - we use RAID 6 for data, though we've used RAID 1 for /boot and /. Since I keep reading that "we really need to fix the fsck,etc tools for > 16TB in the next year" for the last 4 years (at least), I partition them as 14-16TB, and that works just fine.
mark
Now what's going on?
I tried to post my reply *twice*, about an hour and a half ago. And they both were blocked by manitu... except when I followed the link to fill out the form, *BOTH* *TIMES* manitu told me that the mailserver was *not* listed.
mark
On 5/7/2014 11:36 AM, m.roth@5-cent.us wrote:
Also, my manager is very much not a fan of LVM, but we do have*large* RAIDs - we use RAID 6 for data, though we've used RAID 1 for /boot and /. Since I keep reading that "we really need to fix the fsck,etc tools for > 16TB in the next year" for the last 4 years (at least), I partition them as 14-16TB, and that works just fine.
Nowdays, any data volumes other than root and boot I format xfs. no fsck or > 16TB problems there.
I generally use raid10 for data, as my data is usually database oriented and raid6(0) performs poorly on committed random writes. raid6 or 6+0 gets used for large archival 'nearline' applications, like a backup server.
After avoiding lvm for years, I've found its too handy. the root vg will have an adequate sized / and /home and lots of unassigned space, so if I need more space for / or /home I can allocate it later. I tend to use dedicated xfs file systems for my database server versus other application file storage requirements, these will all be on the data vg.
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John R Pierce -
m.roth＠5-cent.us