On 03/12/2013 08:11 AM, Guillaume wrote: > Hello Mike > > On 12 mar, 02:54, Mike Christie <[email protected]> wrote: >> On 03/09/2013 05:58 AM, Guillaume wrote: >> >>> Hello, >> >>> I have a virtual tape library and a iscsi SAN. All have multiple >>> ethernet interfaces, This will ressult in multiples sessions to the >>> targets.So I wonder if I must use dm-multipath or not ? Does the current >> >> Does the device show up as a tape device or a block device? >> > > The VTL device emulates robotics, LTO cartridges and LTO5 tape drives. > The SAN is a block device.
Are you using SCST or TGT or LIO for this? > >>> iscsi layer handle the multiple paths to an iqn or not ? >> >>> Another question about the output of "iscsiadm -m session" : the lines >>> of output begins by @IP:3260,n where n is an integer. Is this number a >>> priority level in some way, or does it only distinguish multiple >>> sessions to the same iqn ? >> >> It is the iSCSI target portal group number. It is assigned by the >> target. You can use it to group portals together. If the initiator and >> target supports MC/s you could then do a iSCSI level multipathing called >> MC/s over portals with the same target portal group number. open-iscsi >> does not support MC/s >> >> > > So what I understand is that I must use md-multipath to handle the Use dm-multipath. md-multipath is older and does not have as many features. > multiple path to the targets and give applications a unique path to > the tape or block devices. My storages systems support MC/S but my > linux boxes won't. > >> >> >> >> >> >> >> >>> Regards, >>> Guillaume >> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "open-iscsi" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To post to this group, send email to [email protected]. >>> Visit this group athttp://groups.google.com/group/open-iscsi?hl=en. >>> For more options, visithttps://groups.google.com/groups/opt_out. > -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/open-iscsi?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
