Hi. We have Bladecenter H with HS22 servers inside. All servers have 0b:00.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1064ET PCI-Express Fusion-MPT SAS (rev 10) with two possible external SAS connections which we use to connect them with DS3512 (IBM datastorage) using two SAS cables and thus multipath configuration is in place. We use ubuntu 10.04 here and since in-stock scsi_dh_rdac kernel module does not support IBM 1746 devices I've patched it and rebuild kernel. Now, as I modproble module I see the following in dmesg: [ 27.861388] sd 0:0:2:1: rdac: LUN 1 (owned) [ 27.861836] sd 0:0:3:1: rdac: LUN 1 (unowned) [ 27.861840] rdac: device handler registered That's Ok, but multipath output does not have rdac: root@btv1:~# multipath -l vod (360080e50001baa46000025834d501798) dm-0 IBM ,1746 FASt [size=13T][features=0][hwhandler=0] \_ round-robin 0 [prio=0][active] \_ 0:0:2:1 sdc 8:32 [active][undef] \_ round-robin 0 [prio=0][enabled] \_ 0:0:3:1 sdd 8:48 [active][undef] Is this normal? On Gentoo system connected to the same DS I see: mon1 ~ # multipath -l vod (360080e50001baa46000025834d501798) dm-0 IBM,1746 FAStT size=13T features='3 queue_if_no_path pg_init_retries 50' hwhandler='1 rdac' wp=rw |-+- policy='round-robin 0' prio=-1 status=active | `- 0:0:2:1 sdc 8:32 active undef running `-+- policy='round-robin 0' prio=-1 status=enabled `- 0:0:3:1 sdd 8:48 active undef running Could you tell me what's hwhandler and why it's 0 in one case and 1 in another. Many thanks for any explanations in advance, -- Peter. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
