Disk storage is generally the permanent data storage of a server.

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7
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3answers
19k views

How do you passthrough native SATA drives to a guest on ESXi?

I have ESXi 4.0 running on an Intel DX58S0 Mothboardboard with an Intel Core i7 930 processor. VT-d is also enabled. I have three drives in the system, drive 0 is used for ESXi. Drive 1 and 2 ...
26
votes
2answers
5k views

Why are enterprise SAS disk enclosures seemingly so expensive?

I will begin by stating that I do not believe this is a duplicate of Why is business-class storage so expensive?. My question is specifically about SAS drive enclosures, and justifying their expense. ...
13
votes
6answers
8k views

SATA Disks that handle write caching properly?

It's pretty common to see advice to disable the write cache on individual disks used for databases because otherwise some disks will acknowledge writes that haven't yet made it to the disk surface. ...
16
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2answers
12k views

limit linux background flush (dirty pages)

Background flushing in linux happens when either too much written data is pending (adjustable via /proc/sys/vm/dirty_background_ratio) or a timeout for pending writes is reached ...
16
votes
8answers
1k views

Optimal UNIX File System Partition + Setup Strategy

When partitioning a new system disk(s) for UNIX, what is your prefered strategy for both desktop and/or servers? Please include disk partition layout, file system format(s) and options, mount points, ...
15
votes
3answers
22k views

Setting Low Disk Space Alerts on Windows Server 2008

I was wondering if there is an easy way to trigger an e-mail alert on Windows Server 2008 when any logical disk partitions become low on space. I have 2 SQL servers that have come close to running ...
10
votes
5answers
14k views

Linux - Help, I'm running out of inodes!

I have a filesystem that has lots of small files. Currently about 80% of inodes are used (I checked with df -i), however only 60% of disk space is used. How can I 'increase' the number of inodes? If ...
7
votes
3answers
10k views

Linux disk IO load breakdown, by filesystem path and/or process?

Does anyone have experience with a tool that can provide an indication of disk IO load by filesystem path. I use to 'iostat' utility, frequently, to learn how much disk activity is taking place on a ...
5
votes
3answers
1k views

Linux different size for df and du for root partition

On my CentOS server, both of the commands are showing different usage for disk / , df shows this output: Filesystem Size Used Avail Use% Mounted on /dev/xvda2 16G 14G 952M ...
8
votes
4answers
609 views

root full Linux. No free blocks

df -h reports the '/' partition to be 100% full. While running du -hs * on each directory of this partition shows there is still lot of space. tune2efs which reports just one block to be free. Ran ...
5
votes
1answer
785 views

No space left on device — but there is space

I'm running an Ubuntu 12.04.1 server in a VMware virtualized environment that has a strange issue. Twice now, at seemingly random times, the machine has suddenly been unable to write to the root ...
1
vote
1answer
717 views

How to determine a disk consuming service in Windows 2008 server?

How to determine a disk consuming service in Windows 2008 server? I have a problem on Windows 2008 server with a constant growing used disk space? How to determine which service consuming most of the ...
3
votes
4answers
571 views

Disk full on linux server, blocks used is much less then blocks avalable

Output of df is: [root@backup log]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGro 1889811408 1861658948 0 100% / /dev/sda1 101086 ...
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vote
4answers
3k views

100% disk full on Centos?

Can someone tell me, why is this 100% used on the /? How can I fix this problem? I'm not a unix admin, I'm a programmer but can read the books. [root@datasrv /]# df Filesystem 1K-blocks ...
0
votes
2answers
145 views

Partition keeps filling up, don't know why

My partition /dev/sda1 keeps filling up. Besides the "/" directory, I cannot tell what directories are even on this partition in order to search for files to delete. I was able to get it down to 97% ...
14
votes
4answers
58k views

Is it possible to mount/unmount a physical hard drive in Windows XP?

Is it possible to mount/unmount a physical hard drive in Windows XP? Ideally, I'd like to be able to do this from the command line so that I could have batch files to do it, ie: mount.cmd unmount.cmd ...
9
votes
5answers
11k views

How do I easily repair a single unreadable block on a Linux disk?

My Linux system has started throwing SMART errors in the syslog. I tracked it down and believe the problem is a single block on the disk. How do I go about easily getting the disk to reallocate that ...
4
votes
6answers
4k views

How can I tell what's spinning up my drive?

I have enable "spindown" on one of my Linux server's drives, which is only accessed by a BitTorrent client - meaning, when I don't have torrents running, nothing else should be accessing the disk and ...
3
votes
6answers
3k views

Create image of Windows partition on Linux

I'd like to create an image of my Windows partition (so a can restore it later) and I was wondering if anyone could recommend any utilities that are capable of this? Either command line or GUI (pref. ...
10
votes
3answers
2k views

Extremely Slow IO with Simple PostgreSQL 8.4.4 Queries on Centos 5.5

The strange and extremely slow IO pattern I'm seeing is this (output of iostat -dxk 1 /dev/xvdb1): Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm ...
9
votes
9answers
2k views

On a modern system, will using disk compression give me better overall performance?

It seems that CPU increases have outpaced disk speed for a while. Assuming a desktop or laptop with modern dual core Intel/AMD CPU and a single average SATA disk, would doing compression on most all ...
4
votes
5answers
2k views

The difference between desktop-series HDD drives and server-series

What are the main differences between desktop-series hard disks and server-series? The obvious things I can see are: durability (server hardware mostly more qualitative and have more warranty) and ...
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 ...
4
votes
3answers
22k views

centos 100% disk full - How to remove log files, history, etc?

mysqld won't start because disk space is full: 101221 14:06:50 [ERROR] /usr/libexec/mysqld: Error writing file '/var/run/mysqld/mysqld.pid' (Errcode: 28) 101221 14:06:50 [ERROR] Can't start server: ...
2
votes
2answers
10k views

hp smart array p400 - failed disk - hot spare

I am having an issue with a failed disk in a HP DL380 G5 smart array p400. The array setup is RAID 5, 7 disks + hot spare. One disk failed some weeks ago and the hot spare automatically took over, ...
1
vote
1answer
26 views

Identify disks in vCenter to partitions in Linux guest

What I am trying to accomplish is to correlate hard drive in vCenter to the disks in the Linux guest. So here it goes Opening up settings for the guest in vCenter and moving to hardware tab, shows ...
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 ...
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 ...
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 ...
4
votes
2answers
418 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 ...
3
votes
1answer
374 views

iotop and iostat disagree

I'm trying to understand what's going on with my server's disks. It's running Ubuntu 12.04LTS and I'm used to using iostat to know when the disk is the bottleneck. But iostat -xd looks to me like ...
3
votes
5answers
7k views

KVM online disk resize?

We're evaluting KVM for Linux virtualization on a few projects. All is going well so far. But one of our requirements is the ability to add disk space to a running guest without rebooting or taking it ...
2
votes
1answer
226 views

How to deal with bad sectors?

Bad sectors will eventually occur, but how should I deal with them? If a bad sector occurs, does that mean that the data in that sector is irrecoverably lost, and I should restore it from backup? Is ...
2
votes
1answer
334 views

Mount a partition to two mount points

I have a partition called sda4. And I want to store the mysql data and xml files on that partition because the partition which mysql and domain are installed has little space. So I'm planning to ...
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] ...
2
votes
4answers
555 views

Running Linux on a read only disk - possible?

I'm wondering if it is possible to run a Linux server from a read only disk, specifically CentOS 5.4. Our system has a number of Linux machines each with their own disk with it's OS installed. ...
2
votes
4answers
835 views

Missing space on /var partition?

One of our server admins asked me to take a look at this, and I am stumped - our /var partition is full, however I cannot seem to determine where the space has gone. The following is the output of ...
1
vote
2answers
168 views

Why does dd show slow disk speed first time?

I'm checking the disk speed of a hdd on CentOS 6 using dd command. The setup is a DRBD setup - with this server being primary. To ensure that I get correct values, I execute the dd command 3 times ...
1
vote
3answers
147 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
1answer
397 views

How to Mount remote disc as local in Windows 7 and Windows 2003?

Is it possible to mount remote file system (on Windows 2003 server) as local disk in Windows 7? I have Windows 2003 server with software RAID and some shares. On another computer with Windows 7 I have ...
1
vote
1answer
386 views

How do I measure and compare disk performance of my Hyper-V Windows VM?

I'm not sure whether this sounds stupid or lazy, but I'm really not sure. I have a problem with the performance of a VM setup (2008R2-64bit Hyper-V running a 2003R2-32bit Windows server) and I'd like ...
1
vote
3answers
64 views

Adding a new drive on a Linux database server

This is a general question to optimize performance, reliability, and consistency. I know that both of these methods work, I'm just wondering if there are (dis)advantages to one over the other. ...
0
votes
0answers
67 views

Two servers with inconsistent disk speed

I have two servers of identical spec (bought at the same time), except for the drive configuration: Server A: C: and D: drives are partitions on the same 2 disk RAID 1 E: is a 2 disk RAID 0 ...
0
votes
3answers
522 views

NVRAM for journals on Linux?

I've been thinking about ways of speeding up disk I/O, and one of the bottlenecks I keep coming back to is the journal. There's an obvious benefit to using an SSD for the journal - over and above just ...
0
votes
2answers
464 views

RAID 1 disk is marked as Spare after replacement

one of two disks in my RAID 1 died so I replaced it. When new disk has been added to array the sync process started and few minutes later it has become a Spare. How can I "force" the disk to be a ...
0
votes
1answer
317 views

How to tell a disk failure in RAID1

I have an old Dell poweredge R200 in collocation which has 2 hard disks in RAID 1. I am wondering how should I know if one one the disks is failed?