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

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1
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3answers
3k views

Strategy to optimize raid cache

HP SmartArray have "Accelerator Ratio: XX% Read / YY% Write", that configures how much cache ram dedicated for read, and how much for write. Is there way to find best proportion on alive server in ...
3
votes
1answer
382 views

Which is the fastest way to move 1Petabyte from one storage to a new one?

First of all, thanks for reading, and sorry for asking something related to my job. I understand that this is something that I should solve by myself but as you will see its something a bit difficult. ...
6
votes
3answers
2k views

Seeking distributed, fault-tolerant, networked block storage [closed]

I'm looking for a distributed, fault-tolerant network storage system which exposes block devices (not filesystems) on the clients. A client's block device should write simultaneously to several ...
4
votes
3answers
252 views

Converting our budget-strapped dev environment to ESXi - how to maximize availability on the cheap

We've already run through the process of virtualizing our production servers and now we want to do the same with our dev environment. However, our provider took care of all of the ESX host and cluster ...
1
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2answers
1k views

Iozone: sensible settings for a server with lots of RAM

I have just acquired a server with: 2x quadcore Xeons 48G ECC RAM 5x 160GB SSDs on an LSI 9260-8i Before deploying the target platform, I'd like to collect as much benchmark data as possible, ...
0
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4answers
388 views

How do I permanently delete a USB storage drive? [duplicate]

Possible Duplicate: Zeroing SSD drives I have an external flash drive that I want to get rid off. I've deleted & formatted it from within Windows but I want to make sure no one can get to ...
4
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2answers
2k views

Building one big filesystem with JBOD and ZFS

How to build a really big ZFS filesystem? The above question is vague in the 1st reading, so more precise. I know how to build big ZFS volume with one computer. e.g. get a good computer with ECC ...
3
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1answer
8k views

RAID5 on SmartArray P410i online resize

I have P410i+256M Cache without battery backup. My RAID5 was build over 3*136GB disks, now all disks were replaced to a 3*300GB array. How can I extend it to use the whole space? HPacucli doesn't ...
2
votes
1answer
196 views

Possible to use Azure xDrive (PageBlob) with on-premises Windows 2008R2

Azure's Windows 2008R2 based hosts currently use blob storage for something called XDrive. Since this is just a driver and a few other system components, has anyone figured out what files need to be ...
1
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4answers
120 views

What is a useful “transfer large things” method/medium? [closed]

Other than through the network, what does everyone use for transferring things like system images or very large files? For example, external case+hard drive like a myBook. Or, extremely large usb/...
12
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4answers
646 views

Hooking up many different external HDs simultaneously

I need a large amount of external storage for an upcoming project. I'm planning on purchasing 10 2TB external drives. I need them all hooked up to a single machine at the same time. What issues ...
27
votes
3answers
13k views

Linux - real-world hardware RAID controller tuning (scsi and cciss)

Most of the Linux systems I manage feature hardware RAID controllers (mostly HP Smart Array). They're all running RHEL or CentOS. I'm looking for real-world tunables to help optimize performance for ...
16
votes
3answers
3k views

150 TB and growing, but how to grow?

My group currently has two largish storage servers, both NAS running debian linux. The first is an all-in-one 24-disk (SATA) server that is several years old. We have two hardware RAIDS set up on it ...
5
votes
2answers
2k views

Repurposed disk - Linux blkid command returns incorrect information

I'm working with an SSD drive removed from a VMware ESXi installation. I'm trying to reuse the disk in an existing Linux installation (CentOS 6.2). The drive sits behind an HP Smart Array P410 RAID ...
0
votes
1answer
112 views

SBS 2008 Duplicate Files - what can I delete

I'm trying to look after my company's SBS 2008 server. It keeps running out of space on the C: (OS)drive, so Exchange stops when it gets down to 4Gb free space. From what I can tell after the last ...
2
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2answers
540 views

How much storage is varnish using?

I'm using a 1 GB file storage in my varnish instance, is there a command or anything to get the current usage of that gigabyte?
0
votes
1answer
476 views

iSCSI storage, partitioning and LVM

We are in the process of moving our (direct attached) storage systems to an iSCSI based consolidate storage and we have come up with this interesting question: where should we place LVM processing? ...
2
votes
2answers
4k views

HP StorageWorks P4500 G2 Manager Management

According to the documentation, a management group should have an odd number of managers greater than 1. I have a four node SAN consisting of P4500 G2s. I plan on having two clusters with two nodes ...
5
votes
1answer
1k views

How do I test the effect of ionice (against a device using the cfq scheduler)?

I'm trying to construct an experiment to measure the effect of ionice. What I'd like to do is to (per another answer on serverfault) cause frequent enough I/O that a sufficiently "niced" process is ...
3
votes
2answers
557 views

Use NAS or Virtualized Server to Serve Files

We are planning to set up 3 VMware nodes and move our infrastructure from physical servers to virtual machines. I haven't decided which NAS to get yet, but I know I need to get one that supports iSCSI ...
0
votes
3answers
23k views

How to measure IOps one virtual machine on VMWare ESX?

How should I measure IOPS generated by a single Virtual Machine in VMWare ESX? Also what would be a normal amount of IOPS for a Windows XP virtual machine?
1
vote
2answers
801 views

How does Direct Attached Storage (DAS) work?

I am about to order a server including a DAS with 12 HDDs. However, since I haven't used such a device before I am not sure if I understood its functionality correctly. If I connect such a device to ...
0
votes
2answers
158 views

Fault tolerance RAID card setup

I have been looking at different LSI MegaRAID cards for my undergoing SAN build, and I couldn't find any information about RAID controller redundancy, I have seen number of storage vendors ex, EMC ...
2
votes
1answer
484 views

ESXi: Allowing a guest OS to use other disk drives in server

I want to test a certain configuration on a new server that has 6 disks, configured as 2 virtual disks in RAID 1 and RAID 10 configuration. Configuration: 6 Total Disk Drives 2 x 250 GB RAID 1 ...
1
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2answers
1k views

sb40c storage blade troubleshooting

we have in our bladesystem c3000 (hp 469499-b21) a bl460c blade partnered with a sb40c storage blade as DAS. the bl460 is running diskless and the storage blade has 4 drives configured as raid 10 ...
0
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1answer
655 views

Cabling order on ProLiant DL180 G5 with SmartArray P800 and 3 x MSA 60 enclosures

For some reason I need to power up a system full of data without having any documentation about cabling. I have : 1x Proliant DL 180 G5 with P800 3x full loaded smart array 60 with probably 2 ...
1
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1answer
1k views

Adding 4TB local SR to XenServer 5.6 SP2

I'm trying to add a secondary local SR to XenServer but not having any success. The server has two RAID 10 arrays; the primary array was selected for VM storage in XenServer setup - it totals 272GB. ...
14
votes
5answers
1k views

Choosing a SAN technology for 100s of VM Web Servers

The Problem We have an issue with performance on an existing platform, so I'm turning to the hive mind for a second opinion on this. The performance issue so far relates to IOPS rather than ...
3
votes
5answers
4k views

Would using SAS disks instead of SATA disks make sense over NFS for a VMWare datastore?

We are deciding whether to use SATA or SAS aggregates on our Filer for our VMWare datastore. We will be using NFS to connect the VMWare hosts to storage. Doesn't seem to make sense to use SAS disks ...
4
votes
2answers
2k views

SAS enclosure doesn't restart - MSA60

I just inherited a HP StorageWorks MSA60 (this is a direct-attach SAS enclosure). I had to move it to another shelf so I turned off the computer which was using it. I also pulled the 2 power cords off ...
2
votes
2answers
801 views

Can you detect partition misalignment from a VM?

First of all the back story - All of a sudden (literally overnight) an instance starts throwing CPU utilization alerts. This is a rather lowly VM (1 vCPU, 2GB RAM) but all it does is very low NFS ...
0
votes
3answers
904 views

Best way to share storage between multiple computers

I need to provide shared storage for multiple application server nodes in a cluster in a Linux environment. In other words, each of the nodes in my cluster needs to be able to read/write files to a ...
2
votes
1answer
2k views

Moving LUNs Previously Attached to Windows 2003 to Windows 2008

We have LUNs from Storage Arrays ( SGI TP9700 FW 6.18 ) previously attached to Windows 2003 to be moved to a Windows 2008 R2 server. Installing and configuring MPIO from SMIA-WSX64-10.80.30.53 my LUN ...
0
votes
3answers
3k views

3WARE 9650-4LPML JBOD DISK to RAID - 1 Mirror Migration How To?

It is possible to migrate a single disk, to Raid 1 as per Table 10 in the User Guide Page 122: http://www.3ware.com/support/UserDocs/3ware9650SE-UsrGuide.pdf I am trying to find what the best method ...
6
votes
4answers
6k views

SAN or NAS 100-200TB - where to start looking? [closed]

I'm starting a project to consolidate a bunch of data and make it available on our LAN. I'm thinking that we may have a need for anywhere from 100-200TB at any one time. What factors should I be ...
4
votes
2answers
6k views

DPM 2010 has allocated 100% of our storage pool. What are our options?

Data Protection Manager 2010 has allocated 100% of our storage pool. We currently have all our protection groups set to 'automatically grow the volumes' [checkbox]. As we were trying to add a ...
2
votes
1answer
56 views

Consolidating SQL Server

We have a number of SQL Server 2008 R2 standard servers, each for a single application that we'd like to consolidate into one physical server. Running perfmon on these servers they're not using a ...
5
votes
1answer
454 views

How long is the “defined grace period” for the idle scheduling class of the CFQ io scheduler?

The ionice man page says A program running with idle io priority will only get disk time when no other program has asked for disk io for a defined grace period. Where is this "grace period" ...
2
votes
1answer
325 views

How can I determine the specific file referenced by fs_usage, which is listed by block

I was investigating a problem on a Mac OS X 10.6.8 Server, where users were complaining of access slowdowns. Network throughput slowed to a crawl. It felt like the server was overburdened. System ...
6
votes
1answer
604 views

Completely disjoint iSCSI networks vs dedicated switches and VLANs

I'm looking for best practice or pros/cons for deploying an iSCSI storage network. The two options are: A completely disjoint iSCSI storage network Dedicated switches with a separate VLAN for ...
0
votes
1answer
826 views

Can a backup server HBA be zoned into 2 tape drives without confusing applications?

| tape drive 1 | ---- | switch 1 | ---- hba1 | backup server | hba2 ---- | switch 2 | -----| tape drive 2 | Our backup server has 2 FC HBAs. Each is zoned into a different drive on the back of the ...
12
votes
5answers
6k views

Any experience with SATA SAS Interposer Cards?

Driven by the current price difference between SATA and SAS disks on one side and the potentially bad behaviour of SATA disks in bigger storage arrays on the other side, I have found so-called SATA-to-...
3
votes
2answers
3k views

Sheepdog versus iSCSI for KVM

What is recommended storage solution as VM count grows? We currently have 5 VM servers (8 core, 32GB) and one storage server. Currently we have ~80 virtual machines running and the storage server's ...
2
votes
3answers
226 views

Local attached storage versus NAS

I currently have 3 old NT File Servers that are about to die, which have no disk level redundancy. We're considering buying drives and attaching them to a newer server that would serve files, but I ...
12
votes
3answers
9k views

Tuning Linux disk caching behaviour for maximum throughput

I'm running into a maximum throughput issue here and need some advice on which way to tune my knobs. We're running a 10Gbit fileserver for backup distribution. It's a two disk S-ATA2 setup on an LSI ...
0
votes
1answer
264 views

What's the best file system for a 200TB Array on a MacOS 10.7? [closed]

We have a Mac server (10.7) with a 200TB disk array. We're trying to decide between HFS+ and the unsupported ZFS. Which should we use, why, and is there another choice that we haven't considered?
1
vote
3answers
2k views

HP DL585 G1 with VMware ESXi 5 - SATA solution, need more storage

I have the following: 2 x DL585 G1 (8 cores) with built in Smart Array 5i (2 x 74GB SCSI in Raid 0) I installed VMware ESXi 5 and got it all working :) However I need more space. I was thinking ...
-1
votes
2answers
259 views

Cross platform, blob storage system

I have a couple of different servers around the house, and a lot of storage on each of these machines. I also have a couple of dedicated servers, and some VMs on these boxes... Most of the boxes and ...
2
votes
1answer
2k views

VMWare VMs to Data Domain storage via EMC Networker backup: Do I need a storage node?

I've got several VMs (Windows Server 2003-2008 R2, application servers, Exchange, SQL, small file servers) residing on ESXi 4.1 hosts. We recently purchased a Data Domain system allowing us to backup ...
-1
votes
1answer
2k views

How to manage HP Array on MSA1000?

On the server I have two fiber channel in multipath that connected to MSA1000: 0b:00.0 Fibre Channel: Emulex Corporation Zephyr-X LightPulse Fibre Channel Host Adapter (rev 02) 0b:00.1 Fibre Channel: ...