2
votes
2answers
80 views

When to use hot-spare?

On my newly purchased HP MDS600 with 70x 4TB Nearline SAS disks, I now need to configure the disks, and I want raidz2, so the raid sizes follows 2^n+2. The options I therefore have are 7 raid sets ...
0
votes
2answers
34 views

Migrate unix-system to hardware RAID-5 possible?

At the moment, I have a Intel SR2500 with 5 disks running at home. 4 of the disks aren't used at the moment due to maintenance-reasons. Because it's an expeiment-laboratory-machine where I can try ...
4
votes
3answers
133 views

How reliable are current 2 TByte consumer grade disk drives?

Most cheap SATA disk drives are rated with "1 non-recoverable read error per 10^14 bits read". What does this mean? 10^14 bits is just 12.5 TByte. If I have a full 2 TByte disk and I copy it to a ...
3
votes
1answer
103 views

how to merge 2 controller (6 Bays each) in HP DL370 G6

I am having a server DL370 G6 as seen in the image below, and I want to install Windows Server 2008 E. we are using it for camera recording. Each slot has 6 2 TB hard disks. I want to merge both as ...
0
votes
0answers
40 views

SATA III HDDs not working on SATA II RAID HBA

I would appreciate any help with this. We have Sunfire x4275 disk server with Sun StorageTek SAS RAID HBA and trying to get working these disks: WD RE 4TB Enterprise SATA III (WD4000FYYZ) Sun RAID ...
3
votes
2answers
141 views

Can a 7200RPM drive transfer speed at a full 6 Gbit/s?

Many vendors sell 4GB SATA and Nearline SAS drives which spin at 7200RPM. The vendors will advertise a 6 Gbit/s interface with no mention of actual data transfer speed. I've had conversations with ...
1
vote
1answer
701 views

Slow Write Speed on ESXi host

I have an ESXi 5.0 free host with an internal datastore of 7.2K 5 disk RAID 5 using a PERC 710 mini RAID controller in a Dell Poweredge R620 Server with 32GB Ram and a 12 Core Xeon. I seem to get ...
0
votes
1answer
1k views

Upgrading a PERC h310 to a PERC H710 mini RAID controller on a Dell R620

I have an ESXi 5.0 Free license host using an internal Datastore (RAID 5, 5 Disk) that was configured with a Dell PERC h310 RAID controller. The disk performance was very poor, so I upgraded to the ...
0
votes
0answers
35 views

How to rearange disks with a new SSD

Here is the problem: I have a Debian server with only 4 disk bays. At the moment there are 4 x 1GB SATA disks in software RAID 10. I'd like to swap one of the SATAs with a 1GB SSD disk and move the OS ...
2
votes
0answers
153 views

Convert single O/S disk to RAID 1 - Ubuntu 12.04 LTS

I have a server running Ubuntu 12.04 LTS with only a single drive. There are 2 more empty hot swap bays in the chassis. I want to add a little redundancy by adding a RAID 1 to the system. The ...
1
vote
3answers
146 views

Small office backups, small NAS (RAID) vs single disk

Assume a small office situation, 5-10 workstations (PCs), and a Windows server hosting a network share. The Windows server is in a 3+1 RAID 5. I am debating with myself over a backup solution and I ...
1
vote
3answers
439 views

IBM SR-BR10i RAID Controller too slow with VMware ESXi

I'm transferring a virtual machine from one ESXi host to another using SSH on both ESXi Servers. But it's painful slow, it's a massive 750GB .vmdk disk image, the VM is stopped (with downtime) and ...
0
votes
1answer
178 views

Will configuring a server with RAID 5 and (2*500gb) + (2*1TB) work?

I'm currently setting up a DELL server, which came with 2*500gb disk drives but is configured in RAID 1. I want to increase the total capacity of the disk storage to at least 1TB. Now with it being ...
0
votes
1answer
36 views

RAID1 Disk blocks don't match but no errors

So I have couple of disks configured with RAID1. The device is: md2 : active raid1 sda5[0] sdb3[1] 274324348 blocks super 1.1 [2/2] [UU] bitmap: 1/1 pages [64KB], 65536KB chunk Though when I ...
1
vote
0answers
122 views

Resize a RAID 5 Partition

I'm moving my VG to a RAID, i have 3 disk 600GB, the VG is in the partition /dev/sdc2 /dev/sdc1 1G type linux <-- Boot partition /dev/sdc2 599G type Linux LVM One disk have the VG and with the ...
1
vote
3answers
1k views

Disk 0 Failed in RAID-1 on Dell PE2950

I'm sure I probably know the answer to this question, and am just looking for some reassurance! We have a Dell PE2950 with a RAID-1 (2 x 300GB) for the OS and a RAID-5 (4 x 300GB) housing some SQL ...
-1
votes
1answer
82 views

boot a non-raid disk on a server

I have a HP ML310e that I am trying to recover data off. It has a RAID 10 array and I am wanting to boot a non-raid hard drive on the server. I can't see this disk in the bios, so I can't boot from ...
0
votes
2answers
365 views

RAID 1 hard disks errors, file system is not mounting

I have a Server with 2 HDDs in soft RAID 1, the OS is Debian Wheezy. After some database testing, the file system has gone to read-only mode, after which I have rebooted the machine. The server is not ...
0
votes
1answer
112 views

Huge disk write speed difference between two different servers

I have two servers, with similar disks. The first server has 4x300GB Seagate Cheetah 15K.5 model nº ST3300655SS 3.5'' RAID 10. The second 4x300GB Seagate Savvio 15K.3 model nº ST9300653SS 2.5'' RAID ...
1
vote
1answer
66 views

3Ware 9500S - Do spare disks spin when not used

Does anybody knows if spare disks connected to a 3Ware 9500s controller will be spinning although not being used? This will wear unnecessarily the disk, possibly spinning for years before a unit gets ...
0
votes
1answer
126 views

Why can't i recover a RAID1 disk which apparently has no errors

For several years now we run a software RAID1 on a old Gentoo box with a custom Linux 2.6.31. The RAID consists of 2 harddisk with 4 partitions each. In the last years it happend about 3-4 times that ...
0
votes
2answers
48 views

Are RAID 1 disks usable transparently?

I was wondering if RAID 1 disks are usable straight away, without the RAID controller. Possible?
3
votes
1answer
3k views

Proliant server will not accept new hard disks in RAID 1+0?

I have a HP ProLiant DL380 G5, I have two logical drives configured with RAID. I have one logical drive RAID 1+0 with two 72 gb 10k sas 1 port spare no 376597-001. I had one hard disk fail and ...
0
votes
2answers
447 views

Disk Activity Alert Windows SBS 2003 on Dell PowerEdge 830 with Raid

Background: I have a Dell PowerEdge 830 Server running Windows SB Server 2003. It has 4gbs of RAM and a ATA CERC SATA 6CH controller with 3 160gb drives in a Raid 5 configuration. The Problem I am ...
-3
votes
1answer
48 views

number of disks for RAID config vs. effect on performance? [closed]

I was wondering how the number of disks used for RAID configuration affects performance? I know that it takes longer to rebuild data, but are there any other performance areas affected??
1
vote
3answers
1k views

RAID10 without write-back cache = horrible write performance?

I have just provisioned a dedicated server on singlehop. I'm running it through some tests to know what to expect performance-wise. On the I/O side (with 4 1TB disks in RAID 10) I get: write-cache ...
2
votes
1answer
63 views

mount hardware raid disk 1 with one disk and no hardware raid controler

I have one of two raid disk (from LSI raid card) There is a way to mount it in a PC and access to the disk without the raid card? Maybe mounting or skipping the first bytes!? Thanks in advance. ...
1
vote
1answer
422 views

Controlling mdadm faulty disk rebuild order in RAID 10 array

I have a Linux mdadm RAID 10 array comprising of 6 (SATA) disks configured with n2 copies. While pulling out one disk, another one in another mirror pair failed. Leaving me with: $ cat /proc/mdstat ...
1
vote
1answer
134 views

Linux RAID: Replacing Failed Drive…permanantly

Okay, odd question here. I have a server with RAID 5. A drive failed, in a really physically in a really odd way. On the machine it boots and is seen by the BIOS but...no partition can be seen on the ...
0
votes
1answer
100 views

Disk array for virtual machines [closed]

Is there any recommened array for placing the disks of a virtual infraestrcture. As example, I heard that for the OS disk is recommened a mirror array. For placing virtual hard dkis which is ...
-4
votes
1answer
131 views

xenserver 5.6 without raid [closed]

The domU in my environment is a xenserver 5.6 fp1 installed on a regular desktop with intel board and i3 processor. I have 8GB or RAM installed and 1 500GB SATA HDD. Obviously, i don't have RAID and ...
0
votes
2answers
904 views

smartd: Device: /dev/sda, FAILED SMART self-check. BACK UP DATA NOW

System: Centos 5.5 64bit RAID: Linux Soft RAID with 2 Disks Mirror Smartd complains about the disk failure in system log: [root@xxx ~]# tail /var/log/messages Jul 3 10:22:45 w11 smartd[6043]: ...
-3
votes
1answer
121 views

Disk buffer: why does it even exist in many disk controllers? [closed]

When you request disk for data, it usually first gets transferred to the disk buffer in the disk controller, and then it gets sent up to RAM (and thus stored in memory). I was just wondering what the ...
6
votes
2answers
3k views

How long should rebuilding 250GB take? [closed]

In a PowerEdge 1900 have I a hardware RAID 5 of 5x250GB disks + 1 hot spare 250GB. Disk 2 have errors, so I forced it offline in the raid bios to replace it. Now it have been rebuilding to the hot ...
4
votes
4answers
2k views

Is it normal for a SAS drive to have a few bad blocks, or should I replace my drive ASAP?

I have a drive—part of a RAID 1 mirror—that has two bad blocks. Adaptec Storage Manger e-mailed me when it detected the blocks. It shows 4 medium errors for that drive, but state is still “optimal”. ...
1
vote
3answers
846 views

iSCSI RAID 1 on two servers, fail scenario

Imagine I have two servers, each server has two disks in RAID 1. Now I merge the two arrays with iSCSI to one RAID 1 disk. Two questions: Can I do the merging of the 4 disks in one go? I can't image ...
0
votes
2answers
488 views

Disk read error after converting basic disk to dynamic disk?

I have a bit of an odd setup. Basically, originally in the server was an older lone 160G harddrive. We've decided to upgrade it to a RAID-1 mirrored 2 disk setup against two new 500G harddrives. It'd ...
2
votes
2answers
433 views

mdadm fail, disk won't show up

One of my disks failed in my raid array: cat /proc/mdstat: Personalities : [raid1] md1 : active raid1 sda2[2](F) sdb2[1] 488086720 blocks [2/1] [_U] md0 : active raid1 sda1[0] sdb1[1] ...
0
votes
2answers
350 views

Ubuntu raid 1 write errors

I have an Ubuntu server set up with two SATA drives in a RAID 1 configuration with MDADM. The machine is used to record raw video, which involves a lot of writing to the disk. Sometimes during video ...
4
votes
2answers
417 views

choosing the right RAID level for PostgresQL database

I got an disk array appliance of 8 disks 1T each (UltraStor RS8IP4). It will be used solely by PostgresQL database and I am trying to choose the best RAID level for it. The most priority is for read ...
1
vote
1answer
865 views

HP SA performance - please estimate

We have HP ProLiant DL370 G6 server with HP SA P410i raid controller, running under CentOS 5.5 x86_64. Some configuration details: 24Gb RAM, 10xHDD SAS 3,5'' 15krpm in RAID1+0, 50/50 read/write in ...
0
votes
2answers
200 views

CentOS: How to tell if a server has BBU turned on? How many disks?

I got a new VPS. It's running CentOS 5.5. The hosting company said some VPS nodes have RAID BBU while some don't. How do I tell whether my VPS node has BBU or not? Also is there a way to tell how ...
1
vote
1answer
861 views

Is it possible to change the Raid5 chunk size of an existing device?

I have an existing raid5 device which I created using mdadm on Linux. When I created the device I set the chunk size to 64 but I would like to test the performance of various sizes but I don't want ...
1
vote
4answers
1k views

How do I Change a damaged Disk in a Raid 5 array

I have a server with a 4-drives Raid 5 array; one of the disks is damaged. All the disks are hot pluggable. My Question is, I want to replace the damaged disk with a new one, do I have to shutdown the ...
3
votes
3answers
473 views

Server nearly unusable when doing disk writes

My question closely relates to my last question here on serverfault. I was copying about 5GB from a 10 year old desktop computer to the server. The copy was done in Windows Explorer. In this ...
1
vote
3answers
812 views

Very slow harddisk performance

Today I was trying to execute a long-running (but highly optimized) query on a server in our company. I've run the same query on the same data on my home computer (5400rpm harddisk) and it took about ...
1
vote
4answers
4k views

Bad disk performance on HP DL360 with Smart Array P400i RAID controller

I have a HP DL360 server with 4x 146GB SAS disks and a Smart Array P400i RAID controller with 256MB cache. The disks are in RAID 5 (3 disks + 1 hot spare). The server is running VMware ESX 3i. The ...
0
votes
1answer
982 views

Are there any problems with running chkdsk /R on a RAID5 array that shows no errors?

I had a 1TB RAID5 array and Windows is showing "corrupt $Mft" and "unable to read file" errors. It says I should run chkdsk but I've heard not to do that when using RAID.
3
votes
5answers
647 views

Optimal Disk setup for SQL Server

I've got a total of 8 physical disks I can use (not including 2 for the mirrored OS) for a fairly high-use SQL Server. It's used to serve a web-app (Win2k3, IIS6, ASP.Net) which has fairly heavy ...
2
votes
1answer
351 views

Can I predict the maximum writes per minute to a disk/RAID array

I've a database running on a windows server I'm monitoring with Hyperic. I see the writes per minute ramping up during the day as we approach our peak load. The peaks are increasing gradually over ...