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15

I just installed ubuntu on my new intel SSD. Now I am not sure, whether paritions are properly aligned in respect to my specific SSD.

Here's my fdisk output.

$ fdisk -l

 Platte /dev/sda: 120.0 GByte, 120034123776 Byte
255 Köpfe, 63 Sektoren/Spur, 14593 Zylinder
Einheiten = Zylinder von 16065 × 512 = 8225280 Bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000a6294

 Gerät boot. Anfang Ende Blöcke Id System
/dev/sda1 * 1 1913 15360000 83 Linux
/dev/sda2 1913 14058 97558528 83 Linux
/dev/sda3 14058 14594 4300800 82 Linux Swap / Solaris

Also, do I still need to align my SSD at all, since I am using TRIM on the ext4 partitions by mounting them with the discard flag.

If it is the case, that my partitions are not properly aligned, what could I do to fix this without having to reinstall everything?

partitioning ssd

share|improve this question

asked Jun 24 '11 at 22:20

jottrjottr

69522 gold badges66 silver badges1111 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What do you mean by "properly aligned"?
  
  – Flimzy
  Jun 25 '11 at 8:03
  

  
  
  
  


• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  As much as I know, SSDs need to be aligned to provide maximum io. Here's an article on the topic. I am still not sure, how I set up alignment for my specific SSD.
  
  – jottr
  Jun 25 '11 at 10:15
  
  

  
  
  
  


• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  Nope, none of those partitions are aligned. It's suggested (citation needed, but GParted does it that way and so does Windows 7) that the start blocks of your partitions (Anfang) are at a sector evenly dividable by 2048 (= 2048 sectors à 512 byte = 1 MiB). – htorqu
  
  – htorque
  Sep 15 '11 at 9:26
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @htorque AFAICT from an article about this, it depends on the segment size, which could be 8 MB or even larger. With a modern disk it would probably be easiest to align it to e.g. 32 MB, to fit with most common segment sizes.
  
  – l0b0
  Jan 11 '13 at 15:47
  
  

  
  
  
  

add a comment
 | 

31

15

I just installed ubuntu on my new intel SSD. Now I am not sure, whether paritions are properly aligned in respect to my specific SSD.

Here's my fdisk output.

$ fdisk -l

 Platte /dev/sda: 120.0 GByte, 120034123776 Byte
255 Köpfe, 63 Sektoren/Spur, 14593 Zylinder
Einheiten = Zylinder von 16065 × 512 = 8225280 Bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000a6294

 Gerät boot. Anfang Ende Blöcke Id System
/dev/sda1 * 1 1913 15360000 83 Linux
/dev/sda2 1913 14058 97558528 83 Linux
/dev/sda3 14058 14594 4300800 82 Linux Swap / Solaris

Also, do I still need to align my SSD at all, since I am using TRIM on the ext4 partitions by mounting them with the discard flag.

If it is the case, that my partitions are not properly aligned, what could I do to fix this without having to reinstall everything?

partitioning ssd

share|improve this question

asked Jun 24 '11 at 22:20

jottrjottr

69522 gold badges66 silver badges1111 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What do you mean by "properly aligned"?
  
  – Flimzy
  Jun 25 '11 at 8:03
  

  
  
  
  


• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  As much as I know, SSDs need to be aligned to provide maximum io. Here's an article on the topic. I am still not sure, how I set up alignment for my specific SSD.
  
  – jottr
  Jun 25 '11 at 10:15
  
  

  
  
  
  


• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  Nope, none of those partitions are aligned. It's suggested (citation needed, but GParted does it that way and so does Windows 7) that the start blocks of your partitions (Anfang) are at a sector evenly dividable by 2048 (= 2048 sectors à 512 byte = 1 MiB). – htorqu
  
  – htorque
  Sep 15 '11 at 9:26
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @htorque AFAICT from an article about this, it depends on the segment size, which could be 8 MB or even larger. With a modern disk it would probably be easiest to align it to e.g. 32 MB, to fit with most common segment sizes.
  
  – l0b0
  Jan 11 '13 at 15:47
  
  

  
  
  
  

add a comment
 | 

I just installed ubuntu on my new intel SSD. Now I am not sure, whether paritions are properly aligned in respect to my specific SSD.

Here's my fdisk output.

$ fdisk -l

 Platte /dev/sda: 120.0 GByte, 120034123776 Byte
255 Köpfe, 63 Sektoren/Spur, 14593 Zylinder
Einheiten = Zylinder von 16065 × 512 = 8225280 Bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000a6294

 Gerät boot. Anfang Ende Blöcke Id System
/dev/sda1 * 1 1913 15360000 83 Linux
/dev/sda2 1913 14058 97558528 83 Linux
/dev/sda3 14058 14594 4300800 82 Linux Swap / Solaris

Also, do I still need to align my SSD at all, since I am using TRIM on the ext4 partitions by mounting them with the discard flag.

If it is the case, that my partitions are not properly aligned, what could I do to fix this without having to reinstall everything?

partitioning ssd

share|improve this question

asked Jun 24 '11 at 22:20

jottrjottr

69522 gold badges66 silver badges1111 bronze badges

$ fdisk -l

 Platte /dev/sda: 120.0 GByte, 120034123776 Byte
255 Köpfe, 63 Sektoren/Spur, 14593 Zylinder
Einheiten = Zylinder von 16065 × 512 = 8225280 Bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000a6294

 Gerät boot. Anfang Ende Blöcke Id System
/dev/sda1 * 1 1913 15360000 83 Linux
/dev/sda2 1913 14058 97558528 83 Linux
/dev/sda3 14058 14594 4300800 82 Linux Swap / Solaris

share|improve this question

asked Jun 24 '11 at 22:20

jottrjottr

69522 gold badges66 silver badges1111 bronze badges

share|improve this question

asked Jun 24 '11 at 22:20

jottrjottr

69522 gold badges66 silver badges1111 bronze badges

asked Jun 24 '11 at 22:20

jottrjottr

69522 gold badges66 silver badges1111 bronze badges

asked Jun 24 '11 at 22:20

jottrjottr

69522 gold badges66 silver badges1111 bronze badges

3 Answers
3

active

oldest

votes

11

Ensuring SSD alignment with parted tool looks like a pretty good guide for aligning your filesystem on the SSD:

1. Get the block size of your SSD in bytes (there are heaps of tips, and I don't know which ones will work for which hardware).


2. 
   

   Start the partition editor:

   
   
   

   sudo parted
   

   
   


3. 
   

   Show the partition table:

   
   
   

   p
   

   
   


4. Verify that the numbers in the Start and Size columns are divisible by the block size.

share|improve this answer

edited Sep 20 at 12:46

Eponymous

11555 bronze badges

answered Jul 16 '11 at 14:35

DavidDavid

98377 silver badges88 bronze badges

• 
  
  
  

  
  7
  

  
  
  
  
  
  

  
  
  The link is dead.
  
  – becko
  Mar 30 '16 at 20:49
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The link should work again.
  
  – Eponymous
  Sep 21 at 17:11
  

  
  
  
  

add a comment
 | 

51

Parted has an align-check build in.

parted /dev/sda
align-check opt n

n is the partition you want to check.

share|improve this answer

edited Nov 22 '15 at 9:50

Martin Ueding

6,8501010 gold badges4343 silver badges7777 bronze badges

answered Jan 11 '13 at 16:45

user1602596user1602596

61111 gold badge55 silver badges33 bronze badges

• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  Worked for me! +1
  
  – Grizly
  Apr 10 '13 at 1:41
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  very simple to check for non-technical user.
  
  – Mani
  Feb 4 '17 at 7:29
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  The optimal alignment uses information reported by disk. That's not always aligned to the physical block size as sometimes the hardware lies about its block size. Sometimes hard disks have 4k blocks internally, but report 512b blocks. Additional check would be to see if start divides to 4096 (and end+1 also)
  
  – NickSoft
  May 30 '17 at 7:14
  
  

  
  
  
  

add a comment
 | 

1

To be sure you have to use both built-in parted align-check option:

for i in `sudo parted /dev/sda -l | grep -oE "^[[:blank:]]*[0-9]+"`; do sudo parted /dev/sda align-check opt "$i"; done

and manual check (calculate divisibility by 4096B)

I've written a bash script to perform both checks:

https://github.com/crysman/check-partitions-alignment

(works on any GNU/Linux OS)

Or you can check manually using this table:

https://docs.google.com/spreadsheets/d/1dnDlhglxxgApvtUv0-nxn1iFYTqkjRELqCOWJtp3hbs/edit#gid=0

And yes, SSD HDD's partitions need to be aligned properly for maximum performance.

share|improve this answer

edited Aug 1 '18 at 9:22

answered Jul 31 '18 at 21:22

crysmancrysman

38222 silver badges1414 bronze badges

add a comment
 | 

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11

Ensuring SSD alignment with parted tool looks like a pretty good guide for aligning your filesystem on the SSD:

1. Get the block size of your SSD in bytes (there are heaps of tips, and I don't know which ones will work for which hardware).


2. 
   

   Start the partition editor:

   
   
   

   sudo parted
   

   
   


3. 
   

   Show the partition table:

   
   
   

   p
   

   
   


4. Verify that the numbers in the Start and Size columns are divisible by the block size.

share|improve this answer

edited Sep 20 at 12:46

Eponymous

11555 bronze badges

answered Jul 16 '11 at 14:35

DavidDavid

98377 silver badges88 bronze badges

• 
  
  
  

  
  7
  

  
  
  
  
  
  

  
  
  The link is dead.
  
  – becko
  Mar 30 '16 at 20:49
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The link should work again.
  
  – Eponymous
  Sep 21 at 17:11
  

  
  
  
  

add a comment
 | 

11

Ensuring SSD alignment with parted tool looks like a pretty good guide for aligning your filesystem on the SSD:

1. Get the block size of your SSD in bytes (there are heaps of tips, and I don't know which ones will work for which hardware).


2. 
   

   Start the partition editor:

   
   
   

   sudo parted
   

   
   


3. 
   

   Show the partition table:

   
   
   

   p
   

   
   


4. Verify that the numbers in the Start and Size columns are divisible by the block size.

share|improve this answer

edited Sep 20 at 12:46

Eponymous

11555 bronze badges

answered Jul 16 '11 at 14:35

DavidDavid

98377 silver badges88 bronze badges

• 
  
  
  

  
  7
  

  
  
  
  
  
  

  
  
  The link is dead.
  
  – becko
  Mar 30 '16 at 20:49
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The link should work again.
  
  – Eponymous
  Sep 21 at 17:11
  

  
  
  
  

add a comment
 | 

Ensuring SSD alignment with parted tool looks like a pretty good guide for aligning your filesystem on the SSD:

1. Get the block size of your SSD in bytes (there are heaps of tips, and I don't know which ones will work for which hardware).


2. 
   

   Start the partition editor:

   
   
   

   sudo parted
   

   
   


3. 
   

   Show the partition table:

   
   
   

   p
   

   
   


4. Verify that the numbers in the Start and Size columns are divisible by the block size.

share|improve this answer

edited Sep 20 at 12:46

Eponymous

11555 bronze badges

answered Jul 16 '11 at 14:35

DavidDavid

98377 silver badges88 bronze badges

share|improve this answer

edited Sep 20 at 12:46

Eponymous

11555 bronze badges

answered Jul 16 '11 at 14:35

DavidDavid

98377 silver badges88 bronze badges

edited Sep 20 at 12:46

Eponymous

11555 bronze badges

edited Sep 20 at 12:46

Eponymous

11555 bronze badges

answered Jul 16 '11 at 14:35

DavidDavid

98377 silver badges88 bronze badges

answered Jul 16 '11 at 14:35

DavidDavid

98377 silver badges88 bronze badges

51

Parted has an align-check build in.

parted /dev/sda
align-check opt n

n is the partition you want to check.

share|improve this answer

edited Nov 22 '15 at 9:50

Martin Ueding

6,8501010 gold badges4343 silver badges7777 bronze badges

answered Jan 11 '13 at 16:45

user1602596user1602596

61111 gold badge55 silver badges33 bronze badges

• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  Worked for me! +1
  
  – Grizly
  Apr 10 '13 at 1:41
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  very simple to check for non-technical user.
  
  – Mani
  Feb 4 '17 at 7:29
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  The optimal alignment uses information reported by disk. That's not always aligned to the physical block size as sometimes the hardware lies about its block size. Sometimes hard disks have 4k blocks internally, but report 512b blocks. Additional check would be to see if start divides to 4096 (and end+1 also)
  
  – NickSoft
  May 30 '17 at 7:14
  
  

  
  
  
  

add a comment
 | 

51

Parted has an align-check build in.

parted /dev/sda
align-check opt n

n is the partition you want to check.

share|improve this answer

edited Nov 22 '15 at 9:50

Martin Ueding

6,8501010 gold badges4343 silver badges7777 bronze badges

answered Jan 11 '13 at 16:45

user1602596user1602596

61111 gold badge55 silver badges33 bronze badges

• 
  
  
  

  
  4
  

  
  
  
  
  
  

  
  
  Worked for me! +1
  
  – Grizly
  Apr 10 '13 at 1:41
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  very simple to check for non-technical user.
  
  – Mani
  Feb 4 '17 at 7:29
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  The optimal alignment uses information reported by disk. That's not always aligned to the physical block size as sometimes the hardware lies about its block size. Sometimes hard disks have 4k blocks internally, but report 512b blocks. Additional check would be to see if start divides to 4096 (and end+1 also)
  
  – NickSoft
  May 30 '17 at 7:14
  
  

  
  
  
  

add a comment
 | 

Parted has an align-check build in.

parted /dev/sda
align-check opt n

n is the partition you want to check.

share|improve this answer

edited Nov 22 '15 at 9:50

Martin Ueding

6,8501010 gold badges4343 silver badges7777 bronze badges

answered Jan 11 '13 at 16:45

user1602596user1602596

61111 gold badge55 silver badges33 bronze badges

parted /dev/sda
align-check opt n

share|improve this answer

edited Nov 22 '15 at 9:50

Martin Ueding

6,8501010 gold badges4343 silver badges7777 bronze badges

answered Jan 11 '13 at 16:45

user1602596user1602596

61111 gold badge55 silver badges33 bronze badges

edited Nov 22 '15 at 9:50

Martin Ueding

6,8501010 gold badges4343 silver badges7777 bronze badges

edited Nov 22 '15 at 9:50

Martin Ueding

6,8501010 gold badges4343 silver badges7777 bronze badges

answered Jan 11 '13 at 16:45

user1602596user1602596

61111 gold badge55 silver badges33 bronze badges

answered Jan 11 '13 at 16:45

user1602596user1602596

61111 gold badge55 silver badges33 bronze badges

1

To be sure you have to use both built-in parted align-check option:

for i in `sudo parted /dev/sda -l | grep -oE "^[[:blank:]]*[0-9]+"`; do sudo parted /dev/sda align-check opt "$i"; done

and manual check (calculate divisibility by 4096B)

I've written a bash script to perform both checks:

https://github.com/crysman/check-partitions-alignment

(works on any GNU/Linux OS)

Or you can check manually using this table:

https://docs.google.com/spreadsheets/d/1dnDlhglxxgApvtUv0-nxn1iFYTqkjRELqCOWJtp3hbs/edit#gid=0

And yes, SSD HDD's partitions need to be aligned properly for maximum performance.

share|improve this answer

edited Aug 1 '18 at 9:22

answered Jul 31 '18 at 21:22

crysmancrysman

38222 silver badges1414 bronze badges

add a comment
 | 

1

To be sure you have to use both built-in parted align-check option:

for i in `sudo parted /dev/sda -l | grep -oE "^[[:blank:]]*[0-9]+"`; do sudo parted /dev/sda align-check opt "$i"; done

and manual check (calculate divisibility by 4096B)

I've written a bash script to perform both checks:

https://github.com/crysman/check-partitions-alignment

(works on any GNU/Linux OS)

Or you can check manually using this table:

https://docs.google.com/spreadsheets/d/1dnDlhglxxgApvtUv0-nxn1iFYTqkjRELqCOWJtp3hbs/edit#gid=0

And yes, SSD HDD's partitions need to be aligned properly for maximum performance.

share|improve this answer

edited Aug 1 '18 at 9:22

answered Jul 31 '18 at 21:22

crysmancrysman

38222 silver badges1414 bronze badges

add a comment
 | 

To be sure you have to use both built-in parted align-check option:

for i in `sudo parted /dev/sda -l | grep -oE "^[[:blank:]]*[0-9]+"`; do sudo parted /dev/sda align-check opt "$i"; done

and manual check (calculate divisibility by 4096B)

I've written a bash script to perform both checks:

https://github.com/crysman/check-partitions-alignment

(works on any GNU/Linux OS)

Or you can check manually using this table:

https://docs.google.com/spreadsheets/d/1dnDlhglxxgApvtUv0-nxn1iFYTqkjRELqCOWJtp3hbs/edit#gid=0

And yes, SSD HDD's partitions need to be aligned properly for maximum performance.

share|improve this answer

edited Aug 1 '18 at 9:22

answered Jul 31 '18 at 21:22

crysmancrysman

38222 silver badges1414 bronze badges

for i in `sudo parted /dev/sda -l | grep -oE "^[[:blank:]]*[0-9]+"`; do sudo parted /dev/sda align-check opt "$i"; done

share|improve this answer

edited Aug 1 '18 at 9:22

answered Jul 31 '18 at 21:22

crysmancrysman

38222 silver badges1414 bronze badges

answered Jul 31 '18 at 21:22

crysmancrysman

38222 silver badges1414 bronze badges

answered Jul 31 '18 at 21:22

crysmancrysman

38222 silver badges1414 bronze badges