Re: Device mapper multipathing
- From: LS Cheng <exriscer@xxxxxxxxx>
- To: zhuchao@xxxxxxxxx
- Date: Tue, 11 Jan 2011 10:34:50 +0100
Hi
Can you provide the storage maker and model?
Normally Storage vendors provides failover policies such as
# For EVA A/A arrays
device {
vendor "HP|COMPAQ"
product "HSV1[01]1
\(C\)COMPAQ|HSV[2][01]0|HSV300|HSV4[05]0"
path_grouping_policy group_by_prio
getuid_callout "/lib/udev/scsi_id -g -u /dev/%n"
path_checker tur
path_selector "round-robin 0"
prio alua
rr_weight uniform
failback immediate
hardware_handler "0"
no_path_retry 18
rr_min_io 100
}
## Device attributes for EMC CLARiiON
device {
vendor "DGC "
product "*"
path_grouping_policy group_by_prio
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
prio_callout "/sbin/mpath_prio_emc /dev/%n"
path_checker emc_clariion
path_selector "round-robin 0"
features "1 queue_if_no_path"
no_path_retry 300
hardware_handler "1 emc"
failback immediate
}
On Tue, Jan 11, 2011 at 6:58 AM, Zhu,Chao <zhuchao@xxxxxxxxx> wrote:
> not sure if anyone else has updated this thread since it was posted;
> We ran into issue of delayed path failover (when one path dies/disabled,
> all IO hang for 30sec-2 min);
> it wasn't that optimal to have that time IO totally freezed;
>
> We were using redhat 5.4 and also tried oracle enterprise kernel;
>
> Would be great to hear more inputs;
>
> Thx
>
>
>
> On Wed, Nov 29, 2006 at 7:08 PM, Luca Canali <Luca.Canali@xxxxxxx> wrote:
>
>> Hi,
>>
>> Is anybody who has used device mapper for Linux willing to share their
>> experience?
>>
>> I have been using Qlogic multipathing so far with the qla2300_conf
>> module on RHEL3. No problem with it, but I am moving to RHEL4 and the
>> needed qla2xxx_conf module is missing from their rmps distribution. So
>> instead I have done a few tests with device mapper multipathing, seems
>> to work fine so far, but nothing can beat real world experience.
>>
>> Thanks,
>> L.
>> --
>> //www.freelists.org/webpage/oracle-l
>>
>>
>>
>
>
> --
> Regards
> Zhu Chao
>
>
>
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