 | | | HP EVA + Qlogic HBA + failover | HP EVA + Qlogic HBA + failover 2005-04-21 - By Stephen Gardner
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On Thu, 21 Apr 2005, Mimmus wrote:
> In my experience, RH qla2300 driver supports failover in RH 3 >=3D U4, be=
fore
> not.
> I tried to pull one of the cables to my switches (I use an HP EVA 3000
> disk-array) and system still works (logging failover to syslog).
>
> Notice that in 2.6 kernels FC support was completely rewritten (no failov=
er
> in driver, peraphs you need to use md) and it is currently in evolution:
> http://kerneltrap.org/node/5022
>
There's just been a discussion similar to this on the nahant-list=20
regarding multipathing so I'll add a couple of notes if you do plan a=20
RHEL3 -> RHEL4 upgrade in the future. As Domenico says this changed in the=
=20
v2.6 kernel and therefore in RHEL4. The RHEL4 QLogic drivers don't have=20
failover built-in (unlike RHEL3) and the end-game is to have multipathing=
=20
abstracted into the device-mapper layer, superceding md multipating. But=20
it'll be RHEL4-U2 before device-mapper multipathing is a reality. Although=
=20
simplistic I think I can say that
- qla driver multipathing / failover isn't in RHEL4
- md multipathing will be superceded but is still present in RHEL4
- device-mapper (dm) multipathing won't be with us until later in the
RHEL4 life-cycle (probably U2), although the kernel modules will go in
in RHEL4-U1
Having read the kerneltrap piece it seems this whole area is in flux at=20
the moment.
Regards,
Stephen
>> From: taroon-list-bounces@(protected)
>> [mailto:taroon-list-bounces@(protected)] On Behalf Of Gabor MICSKO
>> Sent: Thursday, April 21, 2005 5:11 PM
>> To: taroon-list@(protected)
>> Subject: HP EVA + Qlogic HBA + failover
>>
>> Machine: HP Proliant DL380
>> Storage: HP Enterprise Virtual Array 3000
>> OS: Red Hat Enterprise Linux AS release 3 (Taroon Update)
>> Kernel: 2.4.21-15.ELsmp
>>
>> I have two QLogic Corp. QLA2312 Fibre Channel Adapter in HP
>> Proliant. I want to have redundant link to EVA (if one HBA
>> fails -> failover to second HBA).
>>
>> My questions:
>>
>> 1.) Is the qla2300 driver in Taroon failover ready?
>> 2.) If I load the qla2300 with parameter 'ql2xfailover=3D1'
>> (insmod qla2300 ql2xfailover=3D1), is this enough for a full
>> failover-configuration or do I need to set something else?
>>
>> Thanks
>>
>> --
>> Micsk=F3 G=E1bor
>> HP Accredited Platform Specialist, System Engineer (APS, ASE)
>> Szint=E9zis Computer Rendszerh=E1z Rt.
>> H-9021 Gy=F5r, Tihanyi =C1rp=E1d =FAt 2.
>> Tel: +36-96-502-216
>> Fax: +36-96-318-658
>> E-mail: gmicsko@(protected)
>> GPG Key fingerprint: 6FA1 D8BF 3C73 0570 ED5D 82AC A3BE 4E6A
>> CF95 5F50
>>
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