3
votes
2answers
109 views

What to look for when buying a FiberChannel card?

I have a couple of these LSI arrays LSI Model 0834 LSI product name: 1932 LSI Product codename: Mary Jane Enclosure name: Shea (DM1300) End of Life: 31-Dec-2010 but I can't find any information ...
1
vote
1answer
30 views

IBM V7000 firmware upgrade effect on mounted LUN

We've IBM storwize V7000 Storage where the firmware is going to be upgraded to latest version.. This will require a reboot to the storage. I've got arround 10 LUN's (almost 10TB) coming from this ...
4
votes
1answer
57 views

Should new Linux VMs under ESXi 5.5 mount their filesystems with discard option?

When creating new Linux virtual machines using recent (>= 2014) distributions in VMware ESXi 5.5, should they mount their filesystems with the discard option ? I make the assumption that the VM's ...
0
votes
1answer
20 views

How do I change the hostname in a fhgfs management node?

FHGFS is a high performance parallel file system typically used in clusters. How would you go about changing the hostname of the management server without breaking connection between the storage and ...
4
votes
2answers
143 views

Resizing of volumes used as VMWare NFS datastores causes Linux VM issues

We had to perform a live volume resize of an NFS datastores VMWare uses on our Netapp. All of our Windows VMs were fine after the resize. However, some of our Linux VMs had issues. Some Linux VMs ...
-2
votes
1answer
71 views

Shared storage solution for Debian Wheezy [closed]

I need to setup a new infrastructure which provides high available shared storage between debian servers. Our current solution is a "clustered DRBD NFS solution". We have setup 2 virtual file ...
3
votes
1answer
63 views

How can I measure complex I/O activity to develop realistic benchmarking? [closed]

I need to retrieve a few metric from my service server to benchmark another stroage solution. There are various options are provied by benchmark program(I choosed ...
2
votes
1answer
124 views

Beowulf cluster storage setup [closed]

I'm a Computer Engineering student working on a project with a Verari blade cluster, a bit outdated for today standards. I had acquired some Unix experience but I'm not an expert at all. This Verari ...
3
votes
1answer
87 views

iozone: 5 concurrent threads random read of 300K blocks does more ops/s than using only one thread, what could be the underlying reason?

The partition is in RAID1 using software RAID. Command line used: iozone -s 190g -r 300k -O -b test_file OPS Mode. Output is in operations per second. ...
0
votes
3answers
112 views

Linux: Get information/stats about storage network

I want to know as much info as possible about the SAN a linux server is connected to. What commands will give me the most comprehensive view? Simply knowing the WWN of LUNS doesn't do much for me. ...
0
votes
1answer
46 views

dd output file larger than input file when executed with conv=noerror,sync

I am trying to backup an LVM on one of my servers with the following command: dd bs=4M conv=noerror,sync if=/dev/vg_volgroup/LvmName | ssh myuer@myip "dd of=/home/myuser/LvmName bs=4M ...
1
vote
3answers
49 views

Change disk used by a long running process

Let's suppose I have process that does long calculations (e.g. it's been running for days), it uses a disk as temporary storage to store intermediate results (for example mounted at /mnt and I want to ...
1
vote
1answer
94 views

how to determine the iscsi target's naa in linux

I understand that iSCSI uses iqn / eui to identify target LUN. Once I have discovered the iSCSI target and logged in is there a way to determine the LUN's NAA id for the remote target from a linux ...
4
votes
1answer
144 views

Optimization XFS on Linux guest in Hyper-V (VHDX)

In our company we're using Hyper-V (Windows Server 2012) hypervisor and VM to organize our in-company services in our data-center. I am supposed to set up Ubuntu 12.04 LTS guest for our main database ...
1
vote
3answers
316 views

How many IOPS do I need? My workload bottleneck is storage

How can I know how many IOPS I need my storage to deliver for my overloaded Linux server? I have a server and I know it has storage as its bottleneck. I would like the bottleneck not to be storage, ...
0
votes
0answers
31 views

Cinder storage on windows storage server

I am planning openstack deployement and considering such solution: cinder volumes on Windows Storage Server: http://www.cloudbase.it/cinder-volume-on-windows-storage-server-2012/ and compute ...
0
votes
1answer
173 views

btrfs: Looking for experience on btrfs error modes on bad sectors / read errors / medium erros

While running a Hadoop cluster that uses HDFS (so data is already replicated 3x) we experience often issues with ext4 because some bad sectors (the filesystem is unable to read or write to them) ...
0
votes
0answers
215 views

Detect Fibre Attached Tape Drive in Red Hat Linux

I am running Red Hat Linux 6.4 and I have one Fibre Attached Tape Drive which is not visible to the OS. I also have the WWPN of the tape drive. The server has two Qlogic HBA Card with two port each. ...
0
votes
1answer
124 views

How to replace NVRAM battery in BlueArc storage?

The RAID/NVRAM battery on a BlueArc Mercury storage host is located in the front of the storage head, and can be replaced without down time. From what I can gather, after battery change, I have to ...
0
votes
1answer
64 views

Scalable NAS: on-premise and minimum of 6 TB [closed]

Shying away from the trending cloud storage and hosting a website on an on-premise 6TB storage, what would you recommend for a scalable NAS. Strictly, the storage solution requires on-premise and ...
7
votes
1answer
202 views

Which block sizes for millions of small files

I have 2x 4TB Disks in hardware RAID1 (it might be a LSI MegaRaid) on Debian Wheezy. The physical block size is 4kB. I'm going to store 150-200 million of small files (between 3 and 10kB). I'm not ...
1
vote
1answer
87 views

libvirt Storage Backend

libvirt supports several storage backends[1] for hosting the image on a different server. We have 6 servers running about 40 VMs. Up to now we use local storage, but to minimize the downtime we want ...
2
votes
3answers
101 views

How to combine storage from different linux servers across public network

I have dedicated hosting servers of 2 TB each, (7 of them) . Now i want to combine the unused space from them and converge them into other server . Note that the servers have public network . Found ...
0
votes
0answers
52 views

EMC + powermt display + dead error

I have Linux red-hat 5.5 cluster machine that connected to EMC storage When I perform powermt display command I see under dead line the number 1 In place to get normal state as 0 Please ...
0
votes
1answer
54 views

Unmount volume or halt Linux on disk IO error

Is there a way to dismount a volume (with open files on it) or cause kernel panic if IO error occurs on underlying disk? OS is Linux. This is needed to prevent data corruption in case of storage ...
0
votes
1answer
41 views

Grid storage for large files on multiple external machines

I have several dedicated servers with unused space on them. 16GB+ RAM, some have SSD, other HDD. All have minimum 100Mbps connection. OS is Debian 7 64bit. There is no LAN connection between machines ...
4
votes
3answers
182 views

Store multiple versions of large binary file with minimal data duplication (preferably Linux)

I need to store multiple versions of a ~ 150 GB binary file (qcow2) on Linux servers with local storage, and was hoping there is some solution that involves just keeping diffs that can be merged as ...
2
votes
1answer
78 views

Creating “Odd” Size Disks in VmWare/Linux

I believe I suffer from "everything must be in powers of 2" syndrome. When asked to create a 30G disk in VmWare for a VM I want to create a 32G disk. If someone needs 256G of storage using LVM I ...
3
votes
2answers
164 views

What is a proper procedure for unplugging fiber chanel from ESXi

In my DC admins have to unplug my FC connection from ESXi5 (from EMC VNX) (temporary, some maintance works). I have never done that before and have some doubt about my own procedure... My first ...
1
vote
1answer
244 views

Is there a programmatic way to determine free disk space on a Linux server?

I have a collection of Linux servers, each of which has a local hard drive with a /tmp directory. Occasionally, the /tmp directory on a server will fill up and cause errors. I want to automate the ...
0
votes
1answer
60 views

How to ensure all public mirrors contain same content?

Basically I plan to have some files mirrored on multiple servers on different providers. A unique cname will auto-balance the traffic across all available mirrors and will serve from the closest to ...
0
votes
1answer
226 views

How to perform Amanda Incremental Backup

I had configured and backup some of windows clients I have a few questions: How can I check the incremental backup is performed or a full backup, I use (amdump server1) to backup all client systems, ...
4
votes
1answer
1k views

How to reliably map vSphere disks <-> Linux devices

Task at hand After a virtual disk has been added to a Linux VM on vSphere 5, we need to identify the disks in order to automate the LVM storage provision. The virtual disks may reside on different ...
1
vote
1answer
46 views

Moved data from an ext4 volume to an ext3 volume and it is consuming more space, why?

Just need a simple answer, did some searching and couldn't find it. What is the metadata overhead with ext3 as compared to ext4? I migrated a number of volumes from a SAN that was using ext4 volumes ...
3
votes
1answer
1k views

Choosing file system block size

Considering unix/linux/bsdunix specific file systems: How can I choose/know which block size to use while creating file system? Is there any specific block size value for a particular file system ...
0
votes
1answer
110 views

What are the options for expanding the available storage on a VPS?

I have several virtual servers hosted at Linode, and I'm looking for a way to expand the available storage capacity. On some of those servers I'd need to have between 0.5 and 2 TB of space. ...
3
votes
4answers
282 views

rm intermittently causes disk to lock up

I have encountered this extremely strange problem on two servers now, both running CentOS5, both of them ext4. One is a SSD, the other is a regular hard drive, both SATA without RAID. The issue is ...
0
votes
1answer
141 views

WebDAV on server exposing ZFS data from another server

Is it even possible to have WebDAV server hosted on one computer and its pulling the "data" (folders and files and all) from another server? Something like so: CentOS Proxy ...
3
votes
2answers
338 views

Linux - Storage IOPS

I have number of MySQL databases, I have used tools such as dstat, vmstat I'm just unable to determine when do I need to add more drives to increase performance. the number of databases are ...
-2
votes
2answers
83 views

Solution to manage data server with multiple drives

I'm looking for some pointers on the best way to manage a Linux data server, with 20 hard drives and with new files always being added (around 30GB/day). Performance is not important, reliability is ...
1
vote
2answers
292 views

Multipath performing very poorly RHEL/HSV200

I'm running a RHEL 5.5 with multipath@HSV200 storage system. The disk performance for write is VERY poor comparing to Windows-system counterparts (which are using the same storage and multipath). ...
1
vote
1answer
622 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 ...
1
vote
2answers
2k views

Determining cause of high NFS/IO utilization without iotop

I have a server that is doing an NFSv4 export for user's home directories. There are roughly 25 users (mostly developers/analysts) and about 40 servers mounting the home directory export. ...
1
vote
2answers
904 views

ZFS/Btrfs/LVM2-like storage with advanced features on Linux? [closed]

I have 3 identical internal 7200 RPM SATA hard disk drives on a Linux machine. I'm looking for a storage set-up that will give me all of this: Different data sets (filesystems or subtrees) can have ...
5
votes
1answer
2k views

How to get checksum data integrity on ext4?

On file systems like btrfs you can preform a scrub, which will go though all the data to see if the data still matches the file system checksum. I would like to check the data on ext4 if it is ...
0
votes
1answer
256 views

EMC + erase LUNS from EMC storage by tool/script

the following link explain how to destroy LUNS / RAID configuration manual VIA Navisphere GUI http://www.thegeekstuff.com/2012/04/emc-delete-lun-raid-group/ my question - I want to find ...
2
votes
1answer
238 views

How to get started troubleshooting Linux mdadm raid10 write performance?

Using Linux mdadm, I've setup a six disk raid10,f2 array. I'm using 7200RPM SATA drives. The biggest load I am worried about is recording four streams of live video (worst case of 20Mbits each, final ...
0
votes
1answer
360 views

What does powercf do on the Solaris file system or EMC storage?

When I run powercf command on my Solaris machine, what changes does this command do on the EMC storage, or on Solaris file system? From the manual: DESCRIPTION During system boot on Solaris ...
4
votes
1answer
6k views

KVM guest io is much slower than host io: is that normal?

I have a Qemu-KVM host system setup on CentOS 6.3. Four 1TB SATA HDDs working in Software RAID10. Guest CentOS 6.3 is installed on separate LVM. People say that they see guest performance almost equal ...
3
votes
1answer
471 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. ...