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46 views

fdisk forces me to start at sector 16384 instead of 2048

I am using fdisk (on Debian Jessie) to create the first partition on a block device /dev/sdc and fdisks default starting sector is 16384. If I enter 2048 instead fdisk prints "Value out of range". I ...
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0answers
24 views

Resize GPT partition

I wanted to resize a sole 2T partition on a 2.5T disk. It's already GPT but its start sector is 63 and using gdisk to re-create the partition after deleting can only create 8-sector aligned partitions ...
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0answers
39 views

Discrepancy between total sectors and calculated total sectors using fdisk

I use ubuntu on vmware. With fdisk command I got this output: Disk /dev/sda: 42.9 GB, 42949672960 bytes 255 heads, 56 sectors/track, 5874 cylinders, total 83886080 sectors Units = sectors of 1 * 512 ...
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1answer
3k views

Fdisk reports: Partition 1 does not start on physical sector boundary. Partition created using Parted

I used Parted to create a partition on my server /dev/sdb. When I run fdisk -l, Warning Partition 1 does not start on physical sector boundary appears. Disk /dev/sdb: 2000.3 GB, 2000341917696 bytes ...
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1answer
609 views

BTRFS, sector alignment and Advance Format Disks

I want to set up a BTRFS RAID1 setup with two WD Red 4TB disks, which possess 4K sectors. Since I am keen to get it right the first time before copying data to it (yes it will be backed up), my ...
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1answer
247 views

Using Seagate 3TB drives with a Dell PERC 710 - do I have to worry about align and sector size?

I'm going to setup our new server with 8 3TB HDD from Seagate. They come, as far as I know, internally with 4K sectors. I've run this past weekend some burn-in tests on the disks, before setting them ...
3
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1answer
503 views

SSD Software RAID Alignment Necessary?

Is it necessary to have the partitions that makeup a software RAID 1 array be aligned? This guide states "Software RAID: Although one needs to pay attention to correct alignment here as well, ...
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1answer
177 views

Disk size addressable by the OS

I have a 3ware 9550SXU-12 storage controller and 750G disks connected to it. The disks are configured as single units (not JBOD). I've been running some performance tests, mainly to see the impact of ...
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1answer
422 views

Is file system alignment required on hardware-raid with SSDs?

We are building a raid-10 with LSI 9260-4i + 4 x Intel DC S3500 SDDs. Partition alignment From what I understand I need to start fdisk with -H32 -S32 or Ted T'so variant with -H224 -S56 in order to ...
5
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1answer
571 views

Checking partition alignment with PowerCLI

I'm trying to verify that the file system partitions within each of the servers I'm working on are aligned correctly. I've got the following script that when I've tried running will either claim that ...
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1answer
102 views

aligning partition boundaries of already installed system

I have qemu raw disk which includes two partitions. The second partition is not aligned according to ssd principles. I will move this into Smartcloud environment and they suggest aligning according to ...
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3answers
1k views

Aligned partitioning of 2TB disk with Linux fdisk

Is there a way to create a single 2TB partition, which is 4096-byte-sector aligned, on a disk using the standard Linux fdisk (I have tried version 2.17.2)? I've tried the following things and ran ...
3
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1answer
734 views

Quantifying the effects of partition mis-alignment

I'm experiencing some significant performance issues on an NFS server. I've been reading up a bit on partition alignment, and I think I have my partitions mis-aligned. I can't find anything that ...
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0answers
488 views

linux hardware raid 10 / lvm / virtual machine partition alignment and filesystem optimization

I've been reading everything I can find about partition alignment and filesystem optimization (ext4 and xfs) but still don't know enough to be confident in setting up my current configuration. My ...
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2answers
2k views

Linux: How to align partition and file system on hardware RAID

I have a test box (PowerEdge 2950) with a Perc 6/i and 4x 15.5k SAS drives attached (with 512 byte block sizes). These are in a single RAID 5 virtual disk with a 64KB chunk size. I am creating a ...