[linux-lvm] Suggested Kernel and LVM version for production storage

[linux-lvm] Suggested Kernel and LVM version for production storage

[Yedidia Klein]

Hello,

I'm using LVM2 on a FC2 based linux w/ the following versions:
Kernel (patched to LVM2 w/ snapshots) :     2.4.23
LVM version:                                                 2.00.15 
(2004-04-19)
Library version:                                             
1.00.14-ioctl (2004-04-06)
Driver version:                                               4.0.5

Sometimes I'm getting the following errors, and get all my LVM 
FileSystem Blocked .. (mean I can't access the files on these partitions 
and have to reboot for getting access again)

    -----------------------------------------------------
    Aug 26 01:00:02 nazir kernel: device-mapper: 
                          Unable to allocate hash table space 
    -----------------------------------------------------
    Aug 26 01:00:02 nazir kernel: device-mapper:
                          error adding target to table 
    -----------------------------------------------------
    Aug 26 10:50:47 nazir kernel: device-mapper:
                          4.0.5-ioctl (2003-11-18) initialised:
                          dm@uk.sistina.com 
    -----------------------------------------------------


Any suggestion for a kernel/LVM version ?
Is anyone running a production system w/ LVM2 and snapshot ? if yes 
which versions ?

thanks,

--Yedidia

Re: [linux-lvm] Suggested Kernel and LVM version for production storage

[Alasdair G Kergon]

On Sun, Aug 29, 2004 at 11:37:06AM +0300, Yedidia Klein wrote:
> Sometimes I'm getting the following errors, and get all my LVM 
> FileSystem Blocked .. (mean I can't access the files on these partitions 
> and have to reboot for getting access again)
 
>    Aug 26 01:00:02 nazir kernel: device-mapper: 
>                          Unable to allocate hash table space 

i.e. There wasn't enough memory available to set up the snapshot.
What sizes:  How big is the LV & snapshot? 
What chunk size?  [Try changing.]
Is there just one snapshot?
Check your memory usage.

Alasdair
-- 
agk@redhat.com

Re: [linux-lvm] Suggested Kernel and LVM version for production storage

[Yedidia Klein]

Alasdair G Kergon wrote:

>On Sun, Aug 29, 2004 at 11:37:06AM +0300, Yedidia Klein wrote:
>  
>
>>Sometimes I'm getting the following errors, and get all my LVM 
>>FileSystem Blocked .. (mean I can't access the files on these partitions 
>>and have to reboot for getting access again)
>>    
>>
> 
>  
>
>>   Aug 26 01:00:02 nazir kernel: device-mapper: 
>>                         Unable to allocate hash table space 
>>    
>>
>
>i.e. There wasn't enough memory available to set up the snapshot.
>What sizes:  How big is the LV & snapshot?
>
main partition is 500GB and I've two snapshots, weekly that is 100G and 
daily that is 60G

> 
>What chunk size?  [Try changing.]
>  
>
chunk is 8.00 KB (what is the suggested value ??)

>Is there just one snapshot?
>  
>
as I wrote there are two..

>Check your memory usage.
>  
>
my hardware memory is almost full 860/1000, but the swap isn't that used 
(it's now 3.3/2000) do the device mapper need more real mem ?? does it 
worth to increase the swap ?

tnx,

--Yedidia

>Alasdair
>  
>