Primarily questions about disk storage, sometimes questions about application storage or cloud storage. Always questions about storing data.

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5
votes
4answers
1k views

RAID-5: Two disks failed simultaneously?

We have a Dell PowerEdge T410 server running CentOS, with a RAID-5 array containing 5 Seagate Barracuda 3 TB SATA disks. Yesterday the system crashed (I don't know how exactly and I don't have any ...
-6
votes
1answer
26 views

How to make multiple FTP servers act like one? [on hold]

Lets say you have 32 FTP servers and they're hosted by: http://www.seagate.com/external-hard-drives/network-storage/business/business-storage-8-bay-rackmount-nas/. The capacity is 32TB. How do you ...
0
votes
1answer
30 views

Creating a scalable back-up cluster with one interface and retention

Currently I'm running a number of back-up servers to back-up other servers with, e.g. b01, b02, .., bn, all with their own IP's, running their own FTP / SSH services. However, I would like to create ...
1
vote
0answers
26 views

Get-MaskingSet in PowerShell 2.0

I'm trying to retrieve the current masking sets using PowerShell 2.0 on a Windows Server 2008 R2. Unfortunately, the cmdlet Get-MaskingSet does not exist under this PowerShell version. Are there any ...
5
votes
2answers
111 views

Array free space requirement

The general rule of thumb is don't use more than 80-85% of your capacity, otherwise performance degrades sharply, and other bad stuff may happen. On a 8TB array, this comes out to around 1.6TB of ...
0
votes
2answers
80 views

RAID consideration for 24 Disk Array

I have here a 24 Disk Array with 3.7 TB disks in it. What would be, performance wise a good configuration when using a RAID 6: RAID 6 over all 24 disks or should I use 2x12 disk RAID 6 and than a RAID ...
0
votes
0answers
12 views

EMC PowerPath Support Matrix

I know this is a stupid question, but I've found nothing online. Does anyone know where EMC has hidden the support matrix documentation so that I know what version of PowerPath is supported with ...
0
votes
1answer
62 views

Can you use SSDs as pure cache in Windows 2012?

I've been doing some reading and I have a feeling that the answer is "no", but before making an implementation decision that has the potential to haunt me for years: Can you use SSDs as pure [write] ...
0
votes
0answers
25 views

vmware esxi host ha state in election

In my Vmware Esxi server 5.1 , 2 host machines which are added as cluster ,there HA state is turned to ELection .I tried Reconfiguring the vsphere for HA it is not working .In cluster it shows issue ...
0
votes
0answers
10 views

Cloud Computing Server Requirements [duplicate]

Im putting together a mobile iOS application and am trying to determine storage cost thru Amazon Web Services (AWS). I am having trouble filling in the following variables: Number of VM's CPU Cores ...
10
votes
2answers
739 views

Why is my RAID1 read access slower than write access?

I have done some simple performance tests and it seems that reading from my RAID1 is slower than writing: root@dss0:~# for i in 1 2 3; do dd if=/dev/zero of=/dev/sda bs=1048576 count=131072; done ...
3
votes
2answers
112 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 ...
12
votes
7answers
568 views

How do storage IOPS change in response to disk capacity?

All other things being equal, how would a storage array's IOPS performance change if one used larger disks. For example, take an array with 10 X 100GB disks. Measure IOPS for sequential 256kb block ...
1
vote
1answer
34 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 ...
2
votes
1answer
23 views

Windows Server 2012 R2 Rescaning Disks Locks System

I'm having an issue when re-scanning disks inside of the Windows Server Manager tool. When I go to: File and Storage Services > Disks > Tasks > Rescan Stroage the entire system locks up ...
3
votes
1answer
124 views

How to active HDD leds on HP MDS 600 / HP D6000?

I have a HP D6000 (sometimes called MDS 600) storage array, HP DL380p G8 with an LSI 9207-8e SAS adapter. When I am in the OmniOS (Solaris 10 fork), I can e.g. dd to one of the disks, but I don't see ...
3
votes
0answers
64 views

Using ZFS head node as database server?

I'm using a dual-head ZFS-backed NAS for high availability cluster shared storage, based on Nexenta's recommended architecture as seen here: The disks in 1 JBOD will store the database files for a ...
4
votes
1answer
74 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
22 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 ...
0
votes
0answers
20 views

datatstax opscenter v 4.1.2 short-os collection failed

I've installed Datastax opscenter v4.1.2. It was bundled with Datastax Cassandra Community edition version 2.0.8. I'm running these on Windows Server 2008 R2 64-bit. When I open opscenter all ...
1
vote
2answers
72 views

What is the maximum theoretical throughput of a NAS device to 100 workstations with 1Gb/sec connections? [closed]

This is a difficult question to ask, since it depends on a number of assumptions. But let's assume we have 100 workstations that need to connect to a network attached storage device. What is the ...
1
vote
1answer
94 views

Error 26101: SSL certificate common name invalid

I have 3 systems with similar configuration: Windows Server Datacenter 2008R2 MS System Center 2012 connected to a storage array On 2 systems I can add the storage provider from VMM without any ...
0
votes
0answers
37 views

Parted does not display partition created in IBM Storwize 3700

My server is running CentOS 6.5. I created a LUN on Storwize 3700 and had named it /dev/mapper/lun1 (I used multipath). And then I created a partition on it and formated it as ext4. When I type ...
0
votes
1answer
130 views

Dell PowerEdge R710 direct-attached to HP MSA 2040 SAN [closed]

I have no idea about Direct attached storage; I do not know that it is possible to do. I plan to use HP MSA 2040 storage to direct attached with my dell Power Edge R710 via Fiber Channel. What do i ...
1
vote
0answers
23 views

HP Command View: Could not find authenticator for Security Domain

I have some HP EVA storage arrays. They are monitored via Command View - the HP management product. Of 8 management servers, a grand total of one will not let me log in using 'domain' credentials - ...
0
votes
0answers
20 views

Error in XenServer iSCSI SR Creation (SR is not available)

I have a XenServer 6.2 with a Debian 7.5 VM which i use as iSCSI target. I have my target reachable by portal but i would make a Storage Repository available in my XenServer pool. Unfortunately, ...
2
votes
1answer
55 views

After resizing a share's quota, why would we need to “resize” the volume?

We have one volume in our NetApp filer with multiple Qtrees that are shared as CIFS. To resize a share we normally: Modify the quota on the share Use "resize" command on the volume Perhaps I'm ...
0
votes
1answer
88 views

devstack - how to add directly attached storage to a single node installation

I have devstack up and running on an Ubuntu 14.04 x86_64 VM in a single node environment. The VM has / mounted on an 8GB primary disk and an 80GB secondary disk mounted on /mnt. Output of mount ...
2
votes
1answer
162 views

How to configure multiple iSCSI Portal Groups on a EqualLogic PS6100?

I am working on a migration from a VMware vSphere environment to a Hyper-V Cluster utilizing Windows Server 2012 R2. The setup is pretty small, an EqualLogic PS6100e and two Dell PowerConnect 5424 ...
0
votes
1answer
88 views

JBOD with PERC H810

I'm wondering if anybody has ever used Dell storage products like the MD3220 array in a JBOD configuration. From what I can tell only perc h810 will work for external JBOD but that is not terribly ...
4
votes
2answers
158 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
2answers
52 views

Store VMs on the same Stick as ESXi

I've a HP N54L Microserver with an ESXi, which runs from the 16GB USB Stick. In vSphere client I can't see any volumes, where I can store my VMs. And I think that ESXi never needs 16 GB to work. Is ...
5
votes
2answers
427 views

Why would Linux VM in vSphere ESXi 5.5 show dramatically increased disk i/o latency?

I'm stumped and I hope someone else will recognize the symptoms of this problem. Hardware: new Dell T110 II, dual-core Pentium G850 2.9 GHz, onboard SATA controller, one new 500 GB 7200 RPM cabled ...
0
votes
1answer
57 views

Selecting an EBS Volume as Root for EC2 instance

When launching an EC2 instance you have the option to select storage for your system but it seems to automatically choose a root volume for you. Is there a way to choose a root volume from among your ...
0
votes
1answer
27 views

Does a HP MDS600 fit in a HP 10636 G2 rack?

In the Quick Installation Giide to the MDS600/D6000 storage server it says IMPORTANT: Some racks other than the HP Rack 10000 Series rack do not allow full access to hard drive bays 29-35 in ...
1
vote
0answers
64 views

Network Block Device (NBD) clients for Windows or similar solutions [closed]

Are there any NBD clients for Windows? Strangely, I cannot find any, or I am searching for them in a wrong way. Such client should be possibly a driver with front-end tool (may be a command-line ...
0
votes
1answer
77 views

How to set two RAID1 on the HP SA-E200i controller?

I have an HP ML350 G5 with a RAID 1 between two SAS disks. I want to add 2 extra disks and configure a new RAID 1 separated from the other one. Reading this topic Multiple RAID arrays on E200i it ...
-2
votes
1answer
79 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 ...
4
votes
1answer
100 views

DFSR Backlog Stuck on Non-Existent Folders

I have two 2008r2 servers setup in a full-mesh multipurpose replication group. (01 and 02). 01 was the source server. The initial sync just finished last night and there are 2 folders that do not ...
1
vote
1answer
95 views

VMDK File Growing After copying it using CP?

Using FreeBSD and a mounted NetApp NFS Share. I'm trying to copy a file FROM: localdisk/something.vmdk (size 527776 kilobytes) TO: nfsmount/copy-something.vmdk (size 533168 kilobytes) But it seems ...
0
votes
0answers
45 views

The `iostat` Command Describes a Non-Existent Block Device

The System An instance running on Amazon EC2 It is an m1.large EC2 instance The instance is running Ubuntu Server 12.04 LTS Here's What Happens... I wanted to measure disk IOPS on my system, and ...
2
votes
0answers
65 views

DFSr detected that a file was changed on multiple servers, but “winning” file and that moved to conflicts folder have same hash

We've just deployed a new DFS replication system between two Windows 2012 R2 servers. We cloned the DFSr database using MS's recommendations ...
-2
votes
1answer
76 views

Which will have more faster for backups between usb drive on vm or NAS drive

I have IBM server with SAS drives and ESXi Server with many VM (not production). Now for backups of VM i have two options But NAS drive and use that on network Get USB drive , attach to FreeNAS VM ...
2
votes
1answer
27 views

MSA2312i shows duplicate enclosures?

I just installed a redundant controller in my MSA70. This is in use with our old MSA2312i SAN. Now I'm seeing two entries for 'Enclosure 3' (the associated MSA70 disk shelf) in the UI. It appears ...
1
vote
1answer
97 views

Video hosting: Host files on web server, storage server, NAS? [duplicate]

I inherited responsibility for the back-end of a growing distance education program. They have a Proliant DL160 Gen8 web server which serves video from a ReadyNAS Pro 6. We currently share the ...
0
votes
1answer
46 views

ReadyNAS 3200 Taking a Long Time to boot

I have a ReadyNAS 3200 that locked up on me. I could web into it, I could see the files on it via CIFS, but it would not allow me to access existing, or edit/create new files. I would get an error ...
0
votes
1answer
78 views

Hyper V with a DELL MD3000 Poor I/O

Current build is 2 Dell R900 24core each 128GB ram - 8x 144GB 15k 2.5 SAS on a Perc 6i local - 15x 300GB 15K 3.5 SAS in a Raid5 DG 6 VG in the MD3000 using 2x Perc 5e HBA - OS Windows 2012 R2 ...
-1
votes
1answer
31 views

Getting ssd, should i keep the ssd cache drive

We are going to install sdd's as main hdd in all of our pc's. However, some of them already have an ssd drive that is beeing used as a cache drive. Should be keep this chace ssd? It was my though ...
3
votes
1answer
68 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 ...
16
votes
2answers
410 views

How can I safely use storage thin provisioning?

I have storage that allows me to thin provision my volumes presented to the clients. Is this safe? What are the best practices?