Re: [Lustre-discuss] OST - low MB/s

2009-09-10 Thread Dr. Hung-Sheng Tsao (LaoTsao)
> From: lustre-discuss-boun...@lists.lustre.org > [mailto:lustre-discuss-boun...@lists.lustre.org] On Behalf Of Dr. Hung-Sheng > Tsao > (LaoTsao) > Sent: Thursday, September 10, 2009 5:50 PM > To: Rafael David Tinoco > Cc: lustre-discuss@lists.lustre.org > Subject: Re: [L

Re: [Lustre-discuss] OST - low MB/s

2009-09-10 Thread Dr. Hung-Sheng Tsao (LaoTsao)
raid 6 chunk size=128k the full strip size will be 128k*8 (for 10 disks 8+2 raid 6) in Ur dd test one should use bs=128k*8, then each 8 HDD will be busy regards Rafael David Tinoco wrote: > > With this RAID5 configuration Im getting: > > r...@a02n00:~# dd if=/dev/zero of=/dev/md20 bs=128k count=

[Lustre-discuss] modify client kernel support

2009-08-30 Thread Dr. Hung-Sheng Tsao (LaoTsao)
hi how do lustre handle some clients need to modify the kernel due to some local requirement? TIA <>___ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss

Re: [Lustre-discuss] Lustre playground in VirtualBox?

2009-08-10 Thread Dr. Hung-Sheng Tsao (LaoTsao)
IMHO, one just need 64-bit support Wolfgang Stief wrote: Hi out there! Before I start installing and fiddling around: Are there any reasons AGAINST setting up a Lustre playground in a VirtualBox environment? I just want to play around w/ recovery and debugging situations and upgrades. No perfo

Re: [Lustre-discuss] OST redundancy between nodes?

2009-06-19 Thread Dr. Hung-Sheng Tsao (LaoTsao)
it seems that one can use dual connected array to two nodes and use software mirroring between the two array to give U double protection 1)HW-raid within array 2)SW raid between arrays hth Kevin Van Maren wrote: Gary Gogick wrote: Heya all, I'm investigating potential solutions for a stor

Re: [Lustre-discuss] MDT backup procedure

2009-06-17 Thread Dr. Hung-Sheng Tsao (LaoTsao)
IMHO, may be one can do a HA-MDS using shared storage all the datas are in the shared storage so U can do a failover Ramiro Alba Queipo wrote: HiDaniel, By reading Chapter 15 of Lustre Operations Manual, it follows that an MDT backup is only useful if you are changing hardwary or the like. I a

Re: [Lustre-discuss] lustre and OS file system

2009-06-17 Thread Dr. Hung-Sheng Tsao (LaoTsao)
Carlos Santana wrote: I am a newbie to the lustre world. I have a very basic and probably stupid question here. When we install a Lustre FS, i.e., install RPM packages for the server side then what happens to the operating system's file system? os fs still support os lustre FS will be on se

Re: [Lustre-discuss] Lustre installation and configuration problems

2009-06-17 Thread Dr. Hung-Sheng Tsao (LaoTsao)
http://blogs.sun.com/manoj/entry/lustre_demo_flash http://blogs.sun.com/manoj/entry/lustre_installation_multi_node Carlos Santana wrote: And is there any specific installation order for patchless client? Could someone please share it with me? - CS. On Wed, Jun 17, 2009 at 10:18 AM, Carlos San