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PetaSAN RAID


Mahmoud Elgohary
12 Posts
August 6, 2018, 8:19 am

which Raid is recommended via PetaSan

#1

admin
2,930 Posts
August 6, 2018, 10:43 am

For the boot error, it looks like the installer correctly wrote the files, i would suspect it could be a bios configuration setting that you need to configure.

For RAID, do not use RAID redundancy for your data disks, since Ceph has built in redundancy and self healing, it works best without it. The real gain of your controller is to provide a write back cache which will give better performance, set the disks to single volume raid0 or jbod (of supported with cache).

For OS/system disk you may like to use RAID 1, but it is not critical as the system can tolerate a node being down.

#2

Mahmoud Elgohary
12 Posts
August 7, 2018, 8:20 am

Dear Admin ,

I have IBM X3650 M3 Server contain :

1- (4) hard disks ( LSI EFI SAS Driver , Size 146 GB , 10 RPM , IBM FRU : 4200633 , IBM P / N : 200636 )

2- (2) Processor ( Processor Speed 2.67 GHz ,  QPI Link : 6.4 Gt/z

3- Memory speed 64 GRAM

4- in my Raid Config i make each 2 hard disk in VD via RAID 0 so i have 2  VDs

  • No Redundancy ( ok )
  • in Write Back Option i have three options ( 1- write Through , 2-Always write Back , 3- write Back with BBU ) which Recommended Option .
  • i make Recervation for my network interfaces MACs  in my DHCP ( Can i give the PetaSAN The Same IP ?? or Not ) i give PetaSAN the same IP .

    5- then i install PetaSAN.iso  and complete all steps when i reboot it

  • open bios Screen with this " SYSLINUX 6.03 EDD 2014-10-06 Copyright (c) 1994-2014 H Peter Anvin et al " then it restart it self ....

There are Any Boot Option Can I do

There was any ISCSI Configuration Can I do

#3

admin
2,930 Posts
August 7, 2018, 4:48 pm

Write back with BBU is better

PetaSAN works with static ips, some ceph components cannot change their ip addresses. you can reserve these ips in your dhcp

Can you try bios boot options, boot in bios not uefi

 

Last edited on August 7, 2018, 4:48 pm by admin · #4

Mahmoud Elgohary
12 Posts
August 8, 2018, 10:13 am

when i create VD which recommended choise

1- RAID Level ( RAID 0 , RAID 1 ) ..... I choose RAID 0

2- Strip Size ( 8 KB , 16 KB , 32 KB , 64 KB , 128 KB , 265 KB , 512 KB , 1 MB ) Default choise is ( 128 KB)

3- Access Policy ( RW , Block , Read Only ) Default choise is (RW)

4-Read Policy ( Normal , Ahead ) Default choise is (Normal )

5-Write Policy (Write with BBU , .............) I choose Write with BBU

6-IO Policy ( Direct , Cached ) Default choise is (Direct)

7- Drive Cache ( Enable , Disable , No Change ) Default choise is (Enable )

8-Diable BGI ( No , Yes ) Default choise is (No )

Can you help me in this choise .....PLZ

 

#5