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Questions tagged [partition-alignment]

18 questions
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1 answer

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 partition alignment, encryption, raid level, etc.…
Marcin Kaminski
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3 answers

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 single test partition that spans the whole drive.…
jwbensley
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Preseed Ubuntu / Debian - Partitioning: prevent "Partition 1 does not start on physical sector boundary."

Preseeding of Ubuntu / Debian works correct - system is bootable. But fdisk -l is resulting following: Disk /dev/sda: 50 GiB, 53687091200 bytes, 104857600 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096…
eXe
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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, this is not explicitly necessary as at least 64…
charles s
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1 answer

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 all virtual servers are aligned or not aligned…
Valrok
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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 remaining confusion comes from the LVM layer and if…
Jason Ward
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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 align the partitions to 512k and 128k…
Andy B
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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 into the described error: If I simply use the -u…
Markus A.
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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 tells me how to actually quantify the effects of…
Matt
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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 255 heads, 63 sectors/track, 243194 cylinders,…
Freeda Suing
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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 question is whether it needs any special considerations…
packoman
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Extremely Low Random Read/Write Performance on (4096 Aligned) Advanced Format Disks

On a SATA 3.0, 6.0 Gb/s *-disk:0 description: ATA Disk product: WDC WD20EFRX-68E vendor: Western Digital physical id: 0 bus info: scsi@1:0.0.0 hw_sector_size: 512 logical_block_size: 512 physical_block_size:…
Gaia
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How to resize mirrored Windows partition

This is my HD setup (Windows Server 2008 R2): I would like to resize my system partition C: (making it larger). How can I do that, without damaging/affecting the mirroring? (This is the simplified version of a question I asked (and deleted!)…
Ben
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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 up in the server, and I noticed in some of the…
Rodrigo Gómez
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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 4k boundaries. How can I change starting…
seaquest
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