Can Anyone Please tell me the answer of following qustions :


1) When we access AOE target device then while acessing it, is it necessary to first unmount it from the server pc , and then use on client nodes ? Why ? Does this prevent file system corruption or we can do it without unmounting it.

2) While using AOE on San with more than one client,  which server ( Kvblade, vblade, ggaoed or qoaed ) is more reliable based on synchronization, speed and reliability ?

3) While acessing the whole disk ( /dev/sda1 to /dev/sda5 ) from target to client, shall we create its Raid array or we can use it five differnt AOE devices. In which way it will be more faster and more secure in terms of synchronization ?


Thanks,
Krishna
 
 

On Thu, Feb 12, 2009 at 2:32 PM, Marc - A. Dahlhaus [ Administration | Westermann GmbH ] <mad@wol.de> wrote:
Hello Krishna,


unless you use a cluster aware filesystem, you should unmount the volume
on the target host before you export it as you risk filesystem
corruption otherwise. If you need the filesystem on more than one host
and one of them is the target server itself you could take a look on the
ggaoed target as it is able to export the same target over loopback and
ethernet ports at the same time and handles concurent access at the same
time as all access goes trough it (i couldn't do this with vblade the
last time i checked it and kvblade did not compile on my box) also it
might be able to give some more verbose or clear error messages...
As cluster aware filesystem i use redhats gfs without problems.


Marc

Am Donnerstag, den 12.02.2009, 14:16 +0530 schrieb er krishna:
> Dear Adi
>
> I have checked it many times, but I am not able to export my block
> device ( any /dev/sda device ) on network through kvblade.  Please
> help me out  at this  point  or  tell where  I  am  missing something.
> I have shown in my previous mail about the devices available on my PC.
> Any more information if you want, then let me know.
>
> Thanks,
> Krishna
>
> On Thu, Feb 12, 2009 at 2:07 PM, er krishna <erkrishna@gmail.com>
> wrote:
>         [root@AOESERVER aoetools-29]#
>         [root@AOESERVER aoetools-29]# df
>         Filesystem           1K-blocks      Used Available Use%
>         Mounted on
>         /dev/sda2             25910052   3312064  21260580  14% /
>         tmpfs                   513476         0    513476
>         0% /dev/shm
>         /dev/sda5              3026640    172868   2697544   7% /tmp
>         /dev/sda3              5010784    141340   4610800   3% /home
>         [root@AOESERVER aoetools-29]#
>         [root@AOESERVER aoetools-29]#
>         [root@AOESERVER aoetools-29]# fdisk -l /dev/sda5
>
>         Disk /dev/sda5: 3199 MB, 3199601664 bytes
>         255 heads, 63 sectors/track, 388 cylinders
>         Units = cylinders of 16065 * 512 = 8225280 bytes
>
>         Disk /dev/sda5 doesn't contain a valid partition table
>         [root@AOESERVER aoetools-29]#
>         [root@AOESERVER aoetools-29]#
>
>
>
>         On Thu, Feb 12, 2009 at 1:43 PM, Adi Kriegisch
>         <adi@cg.tuwien.ac.at> wrote:
>                 Hi!
>
>                 [SNIP]
>                 > devices(/dev/sda ). I am not able to export my block
>                 device over network
>                 > through kvblade ( it doesn't create any entry in
>                 sysfs via udev). I am giving
>                 > the snippet for better understanding :
>
>                 [SNAP]
>                 > [root@AOESERVER kvblade-alpha-3]# ./kvadd 0 1
>                 eth0 /dev/sda5
>                 > ./kvadd: line 13: echo: write error: No such file or
>                 directory
>
>                 This sounds like there is no /dev/sda5. What does
>                 "fdisk -l" say?
>
>                 -- Adi
>
>
>
>
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