similar to: RAID + DRBD + iSCSI + Multipath

We've been wrestling with this for ... rather longer than I'd care to admit. Host / initiator systems are a number of real and virtualized CentOS 5.5 boxes. Storage arrays / targets are Dell MD3220i storage arrays. CentOS is not a Dell-supported configuration, and we've had little helpful advice from Dell. There's been some amount of FUD in that Dell don't seem to know what

We''re currently designing a ZFS fileserver environment with iSCSI based storage (for failover, cost, ease of expansion, and so on). As part of this we would like to use multipathing for extra reliability, and I am not sure how we want to configure it. Our iSCSI backend only supports multiple sessions per target, not multiple connections per session (and my understanding is that the

Hi All, I apologize in advance if this strays too far from the etiquette on the Xen userlist, however the amount of help, brainpower and experience I''ve received from this list with Xen and "peripheral" related issues (i.e. DRBD) have been worth more than it''s weight on gold and I''m hoping someone will be kind enough to give me a "best practices"

Hi, I do have one iscsi storage with 4 GBit nics of which currently only one is configured with an ip and which is in productive use by one cent os 6.3 server. Doing some research brought me to the idea to use some nic bonding or multipathing for that storage, but multipathing I did about four or five years ago only once :) Furthormore I can't find the ultimate answer (may be there is not

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Hello, I have a couple of Dell 2950 III, both of them with CentOS 5.3, Xen, drbd 8.2 and cluster suite. Hardware: 32DB RAM, RAID 5 with 6 SAS disks (one hot spare) on a PERC/6 controller. I configured DRBD to use the main network interfaces (bnx2 driver), with bonding and crossover cables to have a direct link. The normal network traffic uses two different network cards. There are two DRBD

Hi there First of all apologies for the lenghty message, but it's been a long weekend. I'm trying to setup a two node cluster with the following configuration: OS: Debian 6.0 amd64 ocfs: 1.4.4-3 ( debian package ) drbd: 8.3.7-2.1 lvm2: 2.02.66-5 kernel: 2.6.32-45 mdadm: 3.1.4-1+8efb9d1+squeeze1 layout: 0- 2 36GB scsi disks in a raid1 array , with mdadm. 1- 1 lvm2 VG above the raid1 ,

First, I am new to Xen.... So forgive me if I am overlooking something. Here is my situation, I have multiple dom0''s that are part of an ocfs2 cluster. The dom0''s mount multiple volumes (/home, /app, /images) from an ISCSI storage array. Their eth2/eth3 network interfaces are attached to a private storage network. They are not part of Xen''s network bridge and have

CentOS Errata and Enhancement Advisory 2005:1130-2 CentOS 4 x86_86 drbd / heartbeat - Enhancement Update (Extras Only) We are pleased to add drbd (with integrated heartbeat) to the CentOS extras repository. DRBD is a block device which is designed to build high availability clusters. This is done by mirroring a whole block device via (a dedicated) network. You could see it as a network raid-1.

CentOS Errata and Enhancement Advisory 2005:1130-2 CentOS 4 i386 drbd / heartbeat - Enhancement Update (Extras Only) We are pleased to add drbd (with integrated heartbeat) to the CentOS extras repository. DRBD is a block device which is designed to build high availability clusters. This is done by mirroring a whole block device via (a dedicated) network. You could see it as a network raid-1.

Hi, has anyone running Xen on top of iSCSI on top of a DRBD active/passive cluster? Have you tested failovers? Do Xen guests survive? thx, B. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users

I have several CentOS 6 boxes that mount iscsi based luns and use mpath. They all had problems shutting down as a result of unused maps not getting flushed as the system halted. After examining the init scripts, netfs, iscsi and multipathd all had the correct order but mpath failed to flush these maps and the system waited indefinitely. In the meantime I hacked this by adding a `/sbin/multipath

Hi list! I have a server with dual port Qlogic iSCSI HBA. I set up the same LUN for both ports, and boot the CentOS installer with "linux mpath". Installer detects multipathing fine, and creates mpath0 device for root disk. Installation goes fine, and the system boots up and works fine after the install from the multipath root device. After install the setup is like this: LUN 0 on

Hi all, I have a Dell server running cent 5.6, new install, connecting to an IBM DS3500. I have configured iscsi connections using iscsid and can log into the targets on the IBM. I can also mount the LUNs when accessing them from their active controller path. When I throw multipath into the mix, it fails completely. Multipath is working, when I run multipath -ll it shows me the correct active

Hi all, In threads posted by I believe Jonathan Tripley I promised to post my new XEN HA setup. Hope it can be of some use to some people. In this particular case I''m forced to use SLES 10SP3 with XEN 3.2, which excludes the possibility of using things like cLVM (which I don''t think I need anyway). So: Storage: I use two HP ML370 G5 machines with DRBD and heartbeat on

I'm trying to test out an Equallogic PS5500 with a server running CentOS 4.7 I can create a volume and mount it fine using the standard iscsi-initiator-utils tools. The Equallogic box has 3 Gigabit interfaces and I would like to try to set up things so I can read/write from/to the volume using multiple NICs on the server i.e. get 200+ Mbyte/s access to the volume - I've had some

Hi Bootmeisters, I am using gpxelinux.0 + sanboot.c32 to boot a diskless machine into Linux. I would like to use device-mapper-multipath to provide fault tolerant access to its root disk. Although I am able to do this by hardcoding the additional paths in the initrd, it would be better if the bootloader could pass the information in the iBFT (iSCSI Boot Firmware Table). However, at the

Just started messing with multipath against an iSCSI target with 4 nics. What should one expect as behavior when paths start failing? My lab setup was copying some data on a mounted block device when I dropped 3 of 4 paths and the responsiveness of the server completely tanked for several minutes. Is that still expected? Thanks, jlc

Hi, WARNING: Long post ahead I have an issue when starting multipathd. The kernel complains about "blk_cloned_rq_check_limits: over max segments limit". The server in question is configured for KVM hosting. It boots via iBFT to an iSCSI volume. Target is COMSTAR and underlying that is a ZFS volume (100GB). The server also has two infiniband cards providing four (4) more paths over SRP

Dear All, I''m totally new to DRBD + XEN over iSCSI but I need to configure this scenario in order to buy the right hardware. Our department will provide us with an iSCSI target which will be replicated in its own to a secondary iSCSI SAN (probably they will use DRBD). This target will be used, in our ideas, to replicate our own iSCSI san, that we are going to buy. We will probably