Tagged Questions

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

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0
votes
1answer
100 views

Interpreting /proc/diskstats for a webserver: more writes than reads?

Thanks to this answer I was able to see the total reads+writes for my apache webserver: [root@barricade ~]# cat /proc/diskstats | grep sda 8 0 sda 653416 315344 72474412 17441745 4597621 ...
0
votes
1answer
56 views

Display the number of I/O to disk (reads/writes) since the last boot on CentOS

Is it possible to use iostat (or some other tool) to get the number of reads/writes operation "since the last server reboot"? I mean: I'd need to know how many reads/writes the server has done since ...
5
votes
1answer
76 views

Netapp raid scrubbing on a V-Series

My V-Series NAS is running ontap 7.3, and gets all its disk from a SAN. LUNs are provisioned to the Netapp, which puts them into a raid-0. The SAN itself, of course, uses RAID with scrubbing and ...
1
vote
2answers
160 views

Modify CIFS share ACL's

I would like to modify permissions on a number of NetApp CIFS shares (over 100). These are user shares and each share has a different user with "Change" share permission, this permission now needs to ...
-2
votes
1answer
43 views

0.5 TB SQL Server Database, is it possible to store in a standalone server? [closed]

We are facing the task of storing of 0.5 TB of data in a SQL Server 2008 Server. Is it possible to do it in a standalone server? Later we also want to query for generating statistics of the data (a ...
-2
votes
1answer
128 views

CentOS 100% full disk, but no there any large file [closed]

In my CentOS server, hard disk is full but no there any large file in hard disk. I check files size with du command When i reboot the server problem is solve but after 1 or 2 days this problem happens ...
8
votes
0answers
139 views

EMC VNXe GNU Source Code

Does anyone know where EMC host their GNU source code for VNXe products? We are tired with calling Delhi/Idaho for them to dial in to fix trivial issues and would like to figure out the algorithm of ...
1
vote
3answers
480 views

What is the difference between a HBA card and a RAID card?

I thought I knew the difference between HBA and RAID. In my mind, HBA is offloading from the main motherboard/CPU and is simply JBOD... usually has an external SAS ports, whilst a RAID card does the ...
1
vote
0answers
208 views

Sizing of journal disks with Microsoft Storage Spaces parity volume

I'm currently speccing out a new backup server. It's going to be running Windows Server 2012 R2 with Direct Attached Storage, and I'm considering using Storage Spaces rather than using a RAID card. ...
0
votes
0answers
25 views

local RAID vs server RAID with a 10GbE connection [duplicate]

we are trying to configure a descent size (in layman's perspective) storage at my lab. I am a skilled programmer, but my knowledge in hardware at non-consumer level is very limited at this point. At ...
-2
votes
1answer
163 views

Why does a low level format take very long time?

I can write ~100MB/s on a particular 4TB SAS drive when it have a file system on it, but a low level format on this drive took >16 hours. That's ~70kB/s. Since there is not filesystem and only zeroes ...
-8
votes
1answer
92 views

What is a Fibre Channel disk? [closed]

Our NetAPP SAN uses something called "Fibre Channel" disks. What are Fibre Channel disks, and does this mean that I can't replace them with a NetApp SATA or SAS disk?
0
votes
1answer
400 views

How can I reset the Storage Manager password on a IBM DS5020 Storage Array on network using telnet?

I have an IBM DS5020 Storage Array to which the Storage Manager password is lost, but it has been configured on a network and the IP Address is known. How can I reset the password remotely without ...
0
votes
2answers
183 views

Can a NetApp disk array be used as a JBOD?

I have a bunch of (old) NetApp DS14MK2 disks arrays with Fibre Channel connections. I wouldn't use them to anything critical, but instead of throwing them out, could I use each of them as a separate ...
0
votes
0answers
42 views

Creating file server failover cluster

I'm in the process of setting up a new file server cluster with a shared iSCSI disk. I've been through the setup of iSCSI and MPIO and the disk has been initialized, formatted and brought online. ...
0
votes
2answers
59 views

Possible to put larger disks in LSI arrays?

I have a couple of these LSI arrays LSI Model: 0834 LSI Class: 3600 LSI Name: LSI Engenio LSI product name: 1932 LSI Product codename: Mary Jane Enclosure name: Shea (DM1300) End of Life: 31-Dec-2010 ...
0
votes
1answer
66 views

AWS SSD Volume pricing and IO requests [closed]

I'm looking at the pricing for the new SSD storage volumes here, and I see that there is no listed charge for per 1 million I/O requests like there is with magnetic volumes. Does that mean there is ...
16
votes
7answers
6k 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 ...
0
votes
1answer
65 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
1answer
43 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 ...
7
votes
2answers
139 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
240 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
1answer
277 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
320 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] ...
1
vote
1answer
190 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 ...
10
votes
2answers
889 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
156 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
1k 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
134 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
91 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
269 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
131 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
139 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
35 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
48 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
119 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
134 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
77 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
362 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
50 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
74 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
103 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
384 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
705 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
352 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
440 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
97 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
2k 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
90 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
47 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 ...