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Re: [Linux-cluster] Easy and simple question if you already knows theanswer



Dear Cesar,

I connected 16 LUN of 1.5TB and created one LVM.
And, the GFS filesystem was able to be created correctly.
Perhaps, you will be able also to create the GFS filesystem of 30TB.
However, the df command is very slow  :<.

# uname -r
2.6.9-34.ELsmp

--- Logical volume ---
 LV Name                /dev/vg00/gfslv00
 VG Name                vg00
 LV UUID                bNmNaQ-NcRp-Kmp2-AwVx-LEFC-8HlJ-BIeSRZ
 LV Write Access        read/write
 LV Status              available
 # open                 1
 LV Size                23.00 TB
 Current LE             6029312
 Segments               16
 Allocation             inherit
 Read ahead sectors     0
 Block device           253:2

# cat /proc/partitions
major minor  #blocks  name

  8    48 1562488832 sdd
  8    64 1562488832 sde
  8    80 1562488832 sdf
  8    96 1562488832 sdg
  8   112 1562488832 sdh
  8   128 1562488832 sdi
  8   144 1562488832 sdj
  8   160 1562488832 sdk
  8   176 1562488832 sdl
  8   192 1562488832 sdm
  8   208 1562488832 sdn
  8   224 1562488832 sdo
  8   240 1562488832 sdp
 65     0 1562488832 sdq
 65    16 1562488832 sdr
 65    32 1562488832 sds
 65    48   16777216 sdt
253     2 24696061952 dm-2

Regards

------------------------------------------------------
Shirai Noriyuki
Chief Engineer Technical Div. System Create Inc
Kanda Toyo Bldg, 3-4-2 Kandakajicho
Chiyodaku Tokyo 101-0045 Japan
Tel81-3-5296-3775 Fax81-3-5296-3777
e-mail:shirai sc-i co jp web:http://www.sc-i.co.jp
------------------------------------------------------


Hi,


We have plans to build a 30TB aprox. data storage using a set of SAN boxes configured as RAID 5, our understanding is that using LVM2 with Red Hat 4 and our 64 bit AMD opteron processors shall allow us to do that. Our concern is to know in advance if our approach is wrong or even better if somebody else has been successfully taking the same road.

Documentation tells us that the limit is in the order of the 8 Exabytes (8TB for IA-32)
but this not enough as this is a go / no go decision.

 Thanks for any help or pointer to a similar rig.

Cesar O. Pablo



PS: By the way, we already discovered that the max. physical partition cannot exceed 2TB
with our Hardware.





Cesar



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