Tagged Questions

1
vote
1answer
42 views

Machine in read-only mode, do I really need to restart?

In a combination of SAN controller failover and loss of power, several of our machines ended up in read-only mode. After restoring from the failover, I restarted all machines. This got me thinking if ...
1
vote
0answers
23 views

multipath -l vs -ll

What system information is multipath -ll reading that multipath -l does not? From the RHEL DM Multipath Guide -l Display the current multipath configuration gathered from sysfs and the device ...
2
votes
1answer
115 views

How to configure multipath using Intel X520-SR2 10GB on Oracle Linux 6.2?

I've installed the Intel x520-sr2 Ethernet/Fibre card into a server that has Oracle Linux 6.2 Installed on it. When I boot the server I can go into a QLogic menu (screen has something for Intel on ...
1
vote
1answer
199 views

How do you get iSCSI multipath to discover new LUNs that have not been partitioned yet?

Oracle Linux 6.3 iscsi multipath shows LUNs with existing file system but not the raw block devices that have not been partitioned yet. When I run multipath -ll it will show a LUN that has previously ...
2
votes
1answer
723 views

Linux Fiber Channel Host Setup Basic

I've been googling for about 4 hours now with no luck. I am trying to setup a Linux server running Oracle Server 6.3 as a Fiber Channel host. And then connect it to a Dell Compellent Fibre Channel ...
0
votes
0answers
29 views

Cannot login to ISCSI Target - hangs after sending login details

I have an ISCSI target volume, to which i am trying to connect using CentOS Linux server. Everything works fine, but cannot its stuck at login. Here are the steps i am performing: [root@neon ~]# ...
3
votes
5answers
626 views

How to tell if linux disk IO is causing excessive (> 1 second) application stalls

I have a Java application performing a large volume (hundreds of MB) of continuous output (streaming plain text) to about a dozen files a ext3 SAN filesystem. Occasionally, this application pauses for ...
2
votes
1answer
307 views

Page allocation failures on iSCSI storage

We have a CentOS 6.3 iscsi server (16GB RAM) running on Infiniband bus (ipoib). When the load is high I can see multiple errors: Sep 3 23:22:20 stor4 kernel: tgtd: page allocation failure. ...
1
vote
2answers
121 views

Best practice for scaling a single application source to multiple nodes

I have an application which needs to scale horizontally to cover web and service nodes (at the moment they're all on one) but interact with the same set of databases and source files (both application ...
3
votes
2answers
878 views

Can I run iostat on a Synology?

I have a Synology RS812RP+ which I'm using for a little bit of departmental testing. I've stuffed a bunch of SSD disks in it, and I'm curious about monitoring the disk IO. iostat doesn't come ...
-1
votes
1answer
119 views

LVM Storage server [closed]

I have question regarding a storage server, I have VM need to be connected to SAN storage, in order to connect to SAN storage I'm in a scenario which I need to have LVM (Logical Volume Server) between ...
5
votes
1answer
325 views

SAN booting Oracle VM from a UCS blade

We have an Oracle VM Cluster that we are provisioning on a Cisco UCS B series blade chassis. It has 2 fabric interconnects (FC0 and FC1) provisioned to the (3) Oracle VM service profiles and it is set ...
2
votes
1answer
138 views

Transfer Files From Multiple External USB Drives to Linux Server San Storage

We want to transfer files from multiple external USB drives to a Linux server connected to SAN storage. The USB Drives are formated with NTFS and contain media i.e. Images/Videos and will each range ...
-1
votes
1answer
1k views

Free SAN Storage Software for Linux [closed]

I'm looking for a free solution to build virtual disk targets accessible over SAN (iSCSI). Primary requirement for me is data deduplication support. After much search on the internet i came across ...
4
votes
2answers
3k views

How good is failover of the iSCSI target on a two-node linux san?

I'm evaluating the possibility to use two off the shelf servers to build a cheap iSCSI redundant SAN. The idea is to run linux, pacemaker, and an iSCSI target - something like the SAN Active-Passive ...
0
votes
2answers
90 views

Hide iSCSI targets in linux?

My SAN reports the same targets with multiple IP addresses. Is there a way to hide some of those IPs so I don't see the same targets multiple times?
1
vote
5answers
657 views

Mount LUN from SAN at the same time in Windows and Linux

I have a mounted NTFS partition under Windows (2003) and Linux (RHEL 5.7) at the same time. The LUN resides on SAN and is presented to both servers at the same time. At first, the setup looks ok as I ...
3
votes
1answer
899 views

HP MSA2000 SAN configuration concerns - setup critique (msa2324sa)

I'm working on a project with a client who recently had a large system replacement for a dedicated ERP application. I'm inheriting this hardware setup and want to understand what it means. The server ...
1
vote
3answers
2k views

Ext3 Keeps getting Journal Error and Becoming Read-Only

I have a RHEL5.5 x86_64 server with 2 HBA connecting to EMC and HP storage arrays. EMC PowerPath is installed because my EMC vendor insists on that. My problem is the volumes on HP storage often ...
0
votes
1answer
176 views

Read LUN from dell SAN with a PC on linux

We are currently using a md3000i DELL SAN server with a RAID1. I would like to access the information on one disk from a workstation. The hard disk contains 2 LUN but I can only access the first ...
1
vote
3answers
6k views

What are the common Linux commands for SAN-related activities? How do I check if a LUN is attached to the computer?

How do I check if a LUN has been presented to my server? What are the Linux commands for that? Do the LUNs show up in a fdisk -l command like a normal /dev/sda gets listed? What are other commands ...
1
vote
3answers
4k views

which Linux iSCSI target support SCSI 3 Persistant reservations?

looking for Linux iSCSI target software that support SCSI-3 persistent reservations? isci enterprise target tgt: scsi-target-utils open-iscsi
0
votes
1answer
3k views

is multipath -F safe? (flush all unused paths)

from multipath manpage: -F flush all unused multipath device maps is this a safe operation? I have a bunch of old dead paths and would like to clear them out, but want to make sure it's ...
1
vote
2answers
390 views

Migrating the SAN lun in Linux

How to perform LUN migration in Linux (using LVM and native multipath) from one storage device to another storage device
2
votes
3answers
2k views

lpfc + multipath + ubuntu - path keeps switching

I am having issues configuring multipath using Emulex (lpfc). Although I do not detect data corruption the SAN administrator has a tool that shows that the paths are being switched every 20 seconds or ...
0
votes
2answers
70 views

where do i get .mdb and .pst file on my control station

I need help from you again, The customer has asked to locate for .mdb and .pst files .All this is required for the migration process.I 'm not involved while the migration is going on but I 've been ...
1
vote
2answers
1k views

anyone using coraid storage: ATA over ethernet?

can these enclosures be populated with SATA or SAS drives purchased elsewhere? recently Dell has made custom size slots on their PE T710 servers on which you could only place drives purchased from ...
1
vote
3answers
825 views

scalable storage solution using ZFS: OSOL / Nexenta?

some one commented that ZFS is not a distibuted file system and thus more suitable for storage from a box than a cluster. is it possible to start small as NAS with Nexenta / opensolaris and scale up ...
2
votes
3answers
3k views

recommend storage platform: Gluster Vs Nexenta

there is a new release version 3.0: http://www.gluster.com/community/documentation/index.php/Gluster_Storage_Platform has anyone tried this for VM storage? how does this compare to any ZFS based ...
0
votes
2answers
138 views

Should I install software on a “SAN”

I need to set up ColdFusion 9 on a ubuntu server that has a SAN disk mounted. Is it appropriate to install the CF server software on this disk? I don't really understand the ins and outs of what a ...
3
votes
2answers
481 views

Which Linux I/O scheduler for XIV storage?

I'm about to install a large and rather busy DB2 database on a server which uses XIV for (non-transaction log) storage. The server will be running Red Hat Enterprise Linux 5 (64 bit). Linux offers the ...
15
votes
5answers
2k views

Best Practices for virtualizing servers onto the SAN?

Alright, so I want to start leveraging my SAN a little more than I have been, and at the same time, take advantage of ESXi. Currently, I've got an array of Dell PowerEdge 1955 blades connected to a ...
2
votes
3answers
4k views

How to extend a SAN-based Vdisk in Red Hat without rebooting?

First of all, I'm quite new to Linux so forgive me if I use the terms 'disks', 'partitions' and 'devices' incorrectly below! I have a Red Hat 5.2 x86_64 server with kernel version 2.6.18-92.el5. I ...
1
vote
5answers
9k views

EMC PowerPath or MultiPath?

We are using a SAN for our datastorage. I recently got the SAN connected to a CentOS 5.3 server by using the EMC PowerPath software along with the Navisphere Agent running on CentOS. However I have ...
8
votes
2answers
18k views

Fibre Channel LUN rescan and QLogic

I have a serious problem with a SAN storage array connected to a Linux box through Fibre Channel. Here is the configuration : Debian with plain vanilla linux 2.6.27.25 Fibre controller QLogic 4Gb ...
3
votes
4answers
3k views

What are the choices for iSCSI target support for Linux?

I recently purchased an IBM BladeCenter E chassis with HS21 blades. I'd like to build a SAN so the HS21 blades will have more storage space. From everything I've read, iSCSI seems to be the best ...