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

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1answer
32 views

Convert RAID from Mechanical Disks to SSD?

Any issues with converting a Mechanical Disk RAID to SSD by replacing the drives one-by-one? I couldn't find anyone online who has done this, so let's make this the place to post about it. If you ...
1
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1answer
818 views

interpreting IOPS these Bonnie++ and iostat results

I am looking to interpret the IOPS from a few runs of bonnie++ using iostat simultaneously and using the benchmarking from this post: Can I determine IOPS on a disk array using bonnie++? bonnie++ ...
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1answer
25 views

How to change volume mount

I have two volumes in my EC2 ubuntu instance: NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT xvdb 202:16 0 40G 0 disk /mnt xvda1 202:1 0 400G 0 disk / I want the 400GB one to be the main ...
8
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1answer
3k views

VMware ESXi SSD on RAID showing as non-ssd

I am replacing a KVM server with a ESXi server. I just installed ESXi 5.5u1 and added a data store. The new server has 4 SSD drives in RAID 6 using hardware RAID. When I added the data store VMware ...
3
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2answers
56 views

FC-Multipath: Which path_selector performs best?

So I learned that since Red Hat 6 it is possible to choose between 3 algorithms for loadbalancing between different paths to my FC-SAN, the default dumb round-robin - and new - queue-length and ...
2
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2answers
42 views

NetApp filer - lots of 'low water mark' CPs triggering on idle filer

I've 4 NetApp 2240-4 filer heads. They're single chassis 'cluster in a box' so two separate units. Over the last few days, at about the same time - all of them started logging a LOT of Low water ...
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1answer
877 views

Troubleshooting MySQL Performance Issues

Environment: 1 physical machine 8GB RAM some older Core2Duo CPU 1 HDD Windows Vista 64 bit 1 Virtual Machine 16 GB RAM 2 vCPUs Windows 7 64bit Both machines running MySQL 5.5.28 (64Bit) with ...
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11answers
11k views

Does an unplugged hard drive used for data archival deteriorate?

If I were to archive data on a hard drive, unplug it, and set it on a (not dusty, temperature-controlled) shelf somewhere, would that drive deteriorate much? How does the data retention of an ...
2
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1answer
70 views

VMware ESXi <> Synology NFS Share (Physical Switch Redundancy)

This is my storage network: ESXi Host(Dual 10gb NICs) >> 2xNetgear xs712T >> Synology RS10613xs+ (Dual 10gb NICs) ESXi vmnic1 >> NG Switch 1 >> Syn NIC 1 ESXi vmnic2 >> NG Switch 2 >> Syn NIC 2 ...
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1answer
2k views

PowerVault MD3000 Password Reset Console Password

I need to reset the password on a Dell PowerVault MD3000. I have the necessary password reset cable and am able to get to the point where I am prompted for the "password from Dell Technical Support" ...
0
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1answer
34 views

Best span size for 12 x 2TB drives in RAID10

We have just taken delivery of a new JBOD chassis, with 14 x 2TB NL-SAS drives - 2 have already been earmarked for enclosure spares, so we have 12 drives available. I have several options for setting ...
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2answers
453 views

To what degree can I trust a given storage device?

Apologies for the horribly vague question... What are the error rates for reading and writing to storage devices, and do our file systems and OS's account for this? I've had bad sectors on my ...
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2answers
44 views

Performance for ZVOLs presented over iSCSI?

I have the following setup for testing: HP Microserver N36L (Dual-core low-power Athlon64) 8GB ECC RAM 2-port Intel Gigabit NIC 4x3TB WD Green (5400 RPM?) 1 sata disk for OS image (FreeBSD 10.1) ...
0
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1answer
641 views

Install SAS/SATA backplane in Dell PowerVault 220S

Is the backplane of a Dell PowerVault 220S svc tag 3sdpcb1 (14 drive, 80 pin hot swap scsi) upgradeable to a SAS/SATA backplane & controller card replacement? The unit already seems to be quite ...
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0answers
17 views

Btrfs data single mode behaviour when on of devices fail

I want store non critical data on more HDDs (one 2 TB and two 500 GB devices) using Btrfs filesystem with distributed metadata but single data. As I have said, data will not be critical, so if one ...
0
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1answer
39 views

Will a NAS server be adequate for this intended usage?

I'm looking to get a small server to predominantly act as a content storage network drive but I will also want to be able to run Ubuntu or even just the most basic Linux distro. It will have XAMPP and ...
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0answers
40 views

Best scenario for global data replication and distribution between multiple servers [closed]

I need to store and serve about 30TB of data (for now) and the number will increase pretty fast. I also have to keep costs low, so I will have servers with no RAID at all. Instead data should be ...
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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 ...
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3answers
3k views

Unsupported 3TB drives - should we expect any issues?

We recently purchased a number of 3TB drives, only to realize later it was for a Dell server with a PERC 6i, and that >2TB drives are not supported. Based on the amount we paid though, the restocking ...
18
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8answers
10k 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 ...
2
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1answer
42 views

XenServer 6.2: reattach SR but all disks have no description

I have recently reinstalled XenServer on my server. All the VHD files were stored on my NAS via NFS, so I re-added the NFS SR after reinstallation. However, all my VMs seem to be missing, and the ...
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1answer
2k 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 ...
122
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6answers
13k views

Are SSD drives as reliable as mechanical drives (2013)?

SSD drives have been around for several years now. But the issue of reliability still comes up. I guess this is a follow up from this question posted 4 years ago, and last updated in 2011. It's now ...
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0answers
12 views

Automatically map mobile devices to drive letter? [migrated]

Evening community. I'm in the process of developing a windows based application which heavily revolves around mobiles being connected to a machine via USB, Currently. The communication between ...
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1answer
31 views

One SAN connecting to Hyper-V and VMware [closed]

my customer currently has two hypervisor types in place - using VMware for Linux systems and Hyper-V for Windows. They currently have different storage infra for each of these platforms which cost ...
1
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1answer
38 views

IBM DS3400 - how replace a good disk

I've to replace all my disks with other bigger ones. I read in the manual: Never hot-swap a drive when its associated green activity LED is flashing. Hot-swap a drive only when its associated amber ...
3
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1answer
24 views

Undo adding disks to a RAID-Z Configuration

I've started running out of space on one of my data pool and decided to expand it by adding some extra disks. Below is what it looked like before extending: NAME STATE ...
0
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2answers
44 views

Extendable RAID storage system

I am currently building a storage unit for our office. It is rather low budget at the moment, but it needs to be extendable. basically we have a huge database that will grow over the next few months ...
0
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1answer
99 views

OpenStack Cinder: iSCSI login negotiation failure after reboot

I have a Cinder storage and controller node running on the same CentOS 7 box as Nova compute. Everything worked fine, until I rebooted. Now my instances can't mount volumes and I get the errors below. ...
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0answers
36 views

VDS fails to write boot code on a disk during clean operation

We have windows 2008 enterprise server and one of the logical disks D: is missing. On the device manager , whenever we open the window, it asks to choose for MBr or GPT, but choosing neither would ...
2
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2answers
731 views

ESX or ESXi as FCoE or ISCSI or NFS target?

Is is possible to set up ESXi or more expensive ESX server as a storage target (FCoE, ISCSI or NFS, in that order) for other ESX servers? If so, how?
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3answers
852 views

Can you explain why I shouldn't serve PHP off Gluster?

There's a good chance that I'll end up running Drupal on several front-end nodes over the next six months, and I'd like to know if there is a good reason not to have a single instance of Drupal stored ...
2
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1answer
28 views

Exchange 2010 Whitespace after Archive move

We have multiple Archive Mailbox databases. I have had to create a new one with 500GB of Data space for the archives and 150GB for the logging files. The problem I am having is that even after ...
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3answers
2k views

Why can't I extend my dynamic volume over a second drive?

We have a server that is running on hardware RAID1. We've needed to add additional disks, but unfortunately the raid controller doesn't support RAID10. So we've added another RAID1 array, and want to ...
0
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3answers
1k views

how do I find out what part of my ec2 storage is ephemeral

This may be a silly question, excuse my ignorance. I have an instance running like this: Does Root Device : EBS mean my entire system is on EBS? I've configured apache and a perl app here, all my ...
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5answers
3k views

Do I need to RAID Fusion-io cards?

Can I run reliably with a single Fusion-io card installed in a server, or do I need to deploy two cards in a software RAID setup? Fusion-io isn't very clear (almost misleading) on the topic when ...
0
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0answers
9 views

On-Site Backups: JBOD on Existing Array, or 2nd Array?

We're reconfiguring our on-site backups (using Veeam if it makes any difference) and I have a decision to make. I can either purchase an entire new disk array and use that, or I can purchase a JBOD ...
0
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1answer
33 views

Move space from one volume to other

I have one setup where / has 50G space. I want to increase space for /. [root@testsyst ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_testsyst-lv_root ...
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3answers
130 views

What are the differences between consumer grade SSDs and the much more expensive enterprise SSDs?

I am in need of a terabyte or so of storage space for Lucene indices on a testing server. I'm having a hard time differentiating between disks like the Samsung 840 evo for about $450 vs SSDs with ...
2
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1answer
62 views

“Hot data” and erasure coding: how to know if it is efficiently handled?

It is well known that erasure coding adds extra complexity because of encoding and decoding operations. Due to this drawback, most of cloud services recommend to use data replication for hot data and ...
2
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2answers
96 views

HP ProLiant ML350 G6 RAID 1 disk compatibility

We are running an HP ProLiant ML350 with a RAID 1 set up on two identical 300GB 6G SAS 10K rpm SFF (2.5-inch) Dual Port Enterprise HDDs and a third acting as a "hot spare" - HP part # HPQ-507127-S21. ...
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5answers
953 views

ML350 G5 - upgrade hot swap drives to 6 Gb/s?

I support a non profit. They got an ML350 G5 donated to them and I immediately put it to good use for them :) It came with four HP 300GB 15K SAS drives - and of course, they have all now failed. I ...
2
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2answers
604 views

What is good book for administration & configuration of Storage logical arrays? [closed]

I am looking for a book which can explain pros and cons of different combination of configurations/policies of storage Arrays and may also suggest some best practices for certain scenarios for e.g. ...
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5answers
312 views

Pool storage on multiple ubuntu Servers?

Say I've got.. 5 servers, each server has a partition with 50GB's of storage. Is it possible for me to combine these 5 partitions and then mount them as one on a 6th server?
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2answers
47 views

What is optimal sql server cluster storage solution?

I have been assigned a project where sql server is running on a single server with single raid 1 volume. This setup has worked fine until hardware failure resulted in about a day worth of downtime ...
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3answers
60 views

~50tb of storage in Azure presented as a single Windows File Share

I have googled, the closest thing I have found so far is another SF question here: Azure Storage limitations The Goal: Move approx 50TB of storage to the cloud, present that storage as a standard ...
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2answers
957 views

When reading SSD drive specs, what's the difference between MB/s and IOPS?

I'm trying to find a suitable SSD drive for my database server (postgres on debian 7 amd-64), and I find that for some SSD drives, while read speed is specified in MB/s, write speed is in IOPS. To ...
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2answers
28k views

What is the fastest and safest RAID combination for SATA drives?

I wonder what is the fastest and safest RAID combination for SATA drives and general use (some write, mostly read)? RAID 0 is fast but utterly unsafe, RAID 1 is safe but slow, RAID 5 is safe but not ...
2
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1answer
82 views

esxi passthrough storage adapter

I run ESXi 5.1.0 (HP version) on HP ProLiant ML310e G8 v2. There are 2 Storage Adapters: Smart Array P222 Dynamic Smart Array B120i Storage Adapters are visible in ESXi/Storage Adapters. Storage ...
1
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2answers
143 views

How to migrate a ZFS filesystem to use compression?

Question at the bottom. I have several ZFS file system I would like to use ZFS compression, but since enabling the compression will only affect new data written to the file system, I would like to ...