FreeBSD: GELI ile şifrelenmiş ZFS diskin performansını ölçelim

18 Eylül 2013 Emre Çamalan FreeBSD, Geli, 0

FreeBSD de yazma ve okuma hızını ölçmek için yapılan en ilkel teknik diske belirli boyutta bir dosya yazdırılır ve time ile süresi ölçülür;

ZFS diskimin mount edildiği kısıma geçiyorum ve yazma hızını ölçüyorum

cd /tank
/usr/bin/time -h dd if=/dev/zero of=sometestfile bs=1024 count=30000
30000+0 records in
30000+0 records out
30720000 bytes transferred in 0.284663 secs (107917095 bytes/sec)
	0.30s real		0.00s user		0.28s sys

Çeviri yaparsak 107917095 bytes => 102.917761802673 megabytes eder.

Okuma hızını da şöyle ölçebilirim ;

/usr/bin/time -h dd if=sometestfile of=/dev/null bs=1024 count=300000
30000+0 records in
30000+0 records out
30720000 bytes transferred in 0.146465 secs (209743193 bytes/sec)
	0.16s real		0.00s user		0.14s sys

Yine çevirirsek 209743193 bytes => 200.026696205139 megabytes eder..
Bir VM için güzel bence 🙂

Diğer yandan bu işlemler için komutlar da var tabi;

diskinfo -c /dev/ad0s1e

/dev/ad0s1e
	512         	# sectorsize
	23327473664 	# mediasize in bytes (21G)
	45561472    	# mediasize in sectors
	0           	# stripesize
	2442117120  	# stripeoffset
	45199       	# Cylinders according to firmware.
	16          	# Heads according to firmware.
	63          	# Sectors according to firmware.
	VBe810aa12-e2485f76	# Disk ident.

I/O command overhead:
	time to read 10MB block      0.477556 sec	=    0.023 msec/sector
	time to read 20480 sectors  39.934862 sec	=    1.950 msec/sector
	calculated command overhead			=    1.927 msec/sector

diskinfo -t /dev/ad0s1e

/dev/ad0s1e
	512         	# sectorsize
	23327473664 	# mediasize in bytes (21G)
	45561472    	# mediasize in sectors
	0           	# stripesize
	2442117120  	# stripeoffset
	45199       	# Cylinders according to firmware.
	16          	# Heads according to firmware.
	63          	# Sectors according to firmware.
	VBe810aa12-e2485f76	# Disk ident.

Seek times:
	Full stroke:	  250 iter in   1.634982 sec =    6.540 msec
	Half stroke:	  250 iter in   0.112785 sec =    0.451 msec
	Quarter stroke:	  500 iter in   0.267257 sec =    0.535 msec
	Short forward:	  400 iter in   0.192746 sec =    0.482 msec
	Short backward:	  400 iter in   0.166916 sec =    0.417 msec
	Seq outer:	 2048 iter in   0.729265 sec =    0.356 msec
	Seq inner:	 2048 iter in   0.777211 sec =    0.379 msec
Transfer rates:
	outside:       102400 kbytes in   1.978827 sec =    51748 kbytes/sec
	middle:        102400 kbytes in   0.732414 sec =   139812 kbytes/sec
	inside:        102400 kbytes in   0.999502 sec =   102451 kbytes/sec

GELI measure disk write performance, ZFS + GELI disk performance