fetus Diary

2012/05/10(木)

今更感溢れるメモ

wget http://ftp.riken.go.jp/Linux/centos/5.8/os/i386/CentOS/centos-release-5-8.el5.centos.i386.rpm
wget http://ftp.riken.go.jp/Linux/centos/5.8/os/i386/CentOS/centos-release-notes-5.8-0.i386.rpm
rpm -Uvh 今のRPMさん達

rpm -e --nodeps hal

yum remove 要らないkernelさん達

rpm -e --nodeps --justdb python-elementtree
rpm -e --nodeps --justdb 要るkernelさん達

yum clean all
yum upgrade

wget http://ftp.riken.go.jp/Linux/centos/5.8/os/i386/CentOS/python-sqlite-1.1.7-1.2.1.i386.rpm
rpm -Uvh --force python-sqlite-1.1.7-1.2.1.i386.rpm

yum install kernel

HiNa
コメント(0)
12/05/10 ~~15:35~~ 15:35

鯖

2012/04/26(木)

Software RAID(mdadm) 0 vs LVM ストライピング

Linux の Software RAID 0 (mdadm) と LVM のストライピングのどちらが性能が良いのか気になって簡易的に計測してみた。

環境

OS	CentOS 6.2 (x86_64) kernel-2.6.32-220.13.1.el6.x86_64
mdadm	mdadm-3.2.2-9.el6.x86_64
LVM	lvm2-2.02.87-6.el6.x86_64
hdparm	hdparm-9.16-3.4.el6.x86_64
dbench	dbench-4.0-4.el6.x86_64 (EPEL)
CPU	AMD Athlon(tm) II X4 615e Processor
メモリ	2×2GiB×
HDD (sda & sdb)	HGST HDS721050CLA662 (500GB)
パーティション	sda/sdb で全く同じ。先頭 20.5GiB 程度をシステム領域に使用。残りの領域でテスト

準備

mdadm	LVM
// RAID 0 つくるよ # mdadm --create /dev/md2 -n 2 -l 0 /dev/sd[ab]3 // テスト用に LV 作るよ # pvcreate /dev/md2 # vgcreate vg_test /dev/md2 # lvcreate -L 1G -n lv_test vg_test # pvdisplay --- Physical volume --- PV Name /dev/md2 VG Name vg_test PV Size 890.50 GiB / not usable 3.00 MiB Allocatable yes PE Size 4.00 MiB Total PE 227968 Free PE 227712 Allocated PE 256 PV UUID AN8mna-6FP8-Hh3y-EdQm-zzze-uDf2-3pIBQQ // FS つくるよ # mkfs.ext4 /dev/vg_test/lv_test // マウントするよ # mount -o noatime,barrier=0 /dev/vg_test/lv_test /mnt/test	// 32k ストライピングな LV 作るよ # lvcreate -i 2 -I 32 -L 1G -n lv_test vg_test // 本当にストライピングされたかなー？ # pvdisplay --- Physical volume --- PV Name /dev/sda3 VG Name vg_test PV Size 445.25 GiB / not usable 2.51 MiB Allocatable yes PE Size 4.00 MiB Total PE 113984 Free PE 113856 Allocated PE 128 PV UUID KXZEsn-d9Yd-1WmX-8tAD-rx3R-l5Ll-nrWZMb --- Physical volume --- PV Name /dev/sdb3 VG Name vg_test PV Size 445.25 GiB / not usable 2.51 MiB Allocatable yes PE Size 4.00 MiB Total PE 113984 Free PE 113856 Allocated PE 128 PV UUID S7tlIR-FwWD-R4eN-DpTN-kMFy-EWeB-Rdi1Uz // ストライピングされているかは分からないけど均等には割り当てられてるよ // FS つくるよ # mkfs.ext4 /dev/vg_test/lv_test // マウントするよ # mount -o noatime,barrier=0 /dev/vg_test/lv_test /mnt/test

mdadm

LVM

// RAID 0 つくるよ
# mdadm --create /dev/md2 -n 2 -l 0 /dev/sd[ab]3

// テスト用に LV 作るよ
# pvcreate /dev/md2
# vgcreate vg_test /dev/md2
# lvcreate -L 1G -n lv_test vg_test

# pvdisplay
  --- Physical volume ---
  PV Name               /dev/md2
  VG Name               vg_test
  PV Size               890.50 GiB / not usable 3.00 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              227968
  Free PE               227712
  Allocated PE          256
  PV UUID               AN8mna-6FP8-Hh3y-EdQm-zzze-uDf2-3pIBQQ

// FS つくるよ
# mkfs.ext4 /dev/vg_test/lv_test

// マウントするよ
# mount -o noatime,barrier=0 /dev/vg_test/lv_test /mnt/test

// 32k ストライピングな LV 作るよ
# lvcreate -i 2 -I 32 -L 1G -n lv_test vg_test

// 本当にストライピングされたかなー？
# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda3
  VG Name               vg_test
  PV Size               445.25 GiB / not usable 2.51 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              113984
  Free PE               113856
  Allocated PE          128
  PV UUID               KXZEsn-d9Yd-1WmX-8tAD-rx3R-l5Ll-nrWZMb

  --- Physical volume ---
  PV Name               /dev/sdb3
  VG Name               vg_test
  PV Size               445.25 GiB / not usable 2.51 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              113984
  Free PE               113856
  Allocated PE          128
  PV UUID               S7tlIR-FwWD-R4eN-DpTN-kMFy-EWeB-Rdi1Uz
// ストライピングされているかは分からないけど均等には割り当てられてるよ

// FS つくるよ
# mkfs.ext4 /dev/vg_test/lv_test

// マウントするよ
# mount -o noatime,barrier=0 /dev/vg_test/lv_test /mnt/test

hdh3arm で読込速度を計測してみる

mdadm	LVM
# for i in `seq 1 10`; do hdparm -tT /dev/vg_test/lv_test; sleep 2; done /dev/vg_test/lv_test: Timing cached reads: 4366 MB in 2.00 seconds = 2183.51 MB/sec Timing buffered disk reads: 754 MB in 3.01 seconds = 250.67 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4318 MB in 2.00 seconds = 2159.39 MB/sec Timing buffered disk reads: 760 MB in 3.01 seconds = 252.71 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4238 MB in 2.00 seconds = 2118.95 MB/sec Timing buffered disk reads: 762 MB in 3.01 seconds = 253.47 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4278 MB in 2.00 seconds = 2139.42 MB/sec Timing buffered disk reads: 756 MB in 3.00 seconds = 251.98 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4260 MB in 2.00 seconds = 2130.72 MB/sec Timing buffered disk reads: 764 MB in 3.00 seconds = 254.43 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4250 MB in 2.00 seconds = 2125.25 MB/sec Timing buffered disk reads: 758 MB in 3.00 seconds = 252.49 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4264 MB in 2.00 seconds = 2132.13 MB/sec Timing buffered disk reads: 762 MB in 3.01 seconds = 253.02 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4212 MB in 2.00 seconds = 2106.89 MB/sec Timing buffered disk reads: 758 MB in 3.01 seconds = 252.20 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4248 MB in 2.00 seconds = 2124.00 MB/sec Timing buffered disk reads: 758 MB in 3.00 seconds = 252.66 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4258 MB in 2.00 seconds = 2129.24 MB/sec Timing buffered disk reads: 756 MB in 3.00 seconds = 251.96 MB/sec 平均値: 2134.95 MB/s / 252.56 MB/s 中央値: 2129.98 MB/s / 252.58 MB/s	# for i in `seq 1 10`; do hdparm -tT /dev/vg_test/lv_test; sleep 2; done /dev/vg_test/lv_test: Timing cached reads: 4218 MB in 2.00 seconds = 2109.05 MB/sec Timing buffered disk reads: 764 MB in 3.00 seconds = 254.59 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4294 MB in 2.00 seconds = 2147.88 MB/sec Timing buffered disk reads: 756 MB in 3.00 seconds = 251.67 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4338 MB in 2.00 seconds = 2169.47 MB/sec Timing buffered disk reads: 756 MB in 3.00 seconds = 251.77 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4162 MB in 2.00 seconds = 2081.51 MB/sec Timing buffered disk reads: 756 MB in 3.01 seconds = 251.48 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4414 MB in 2.00 seconds = 2207.85 MB/sec Timing buffered disk reads: 766 MB in 3.00 seconds = 255.16 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4318 MB in 2.00 seconds = 2159.36 MB/sec Timing buffered disk reads: 756 MB in 3.00 seconds = 251.77 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4188 MB in 2.00 seconds = 2094.74 MB/sec Timing buffered disk reads: 756 MB in 3.00 seconds = 251.80 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4376 MB in 2.00 seconds = 2187.97 MB/sec Timing buffered disk reads: 756 MB in 3.00 seconds = 251.77 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4294 MB in 2.00 seconds = 2147.57 MB/sec Timing buffered disk reads: 756 MB in 3.00 seconds = 251.65 MB/sec /dev/vg_test/lv_test: Timing cached reads: 4370 MB in 2.00 seconds = 2185.07 MB/sec Timing buffered disk reads: 758 MB in 3.01 seconds = 252.06 MB/sec 平均値: 2149.05 MB/s / 252.37 MB/s 中央値: 2153.62 MB/s / 251.77 MB/s

mdadm

LVM

# for i in `seq 1 10`; do hdparm -tT /dev/vg_test/lv_test; sleep 2; done

/dev/vg_test/lv_test:
Timing cached reads:   4366 MB in  2.00 seconds = 2183.51 MB/sec
Timing buffered disk reads:  754 MB in  3.01 seconds = 250.67 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4318 MB in  2.00 seconds = 2159.39 MB/sec
Timing buffered disk reads:  760 MB in  3.01 seconds = 252.71 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4238 MB in  2.00 seconds = 2118.95 MB/sec
Timing buffered disk reads:  762 MB in  3.01 seconds = 253.47 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4278 MB in  2.00 seconds = 2139.42 MB/sec
Timing buffered disk reads:  756 MB in  3.00 seconds = 251.98 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4260 MB in  2.00 seconds = 2130.72 MB/sec
Timing buffered disk reads:  764 MB in  3.00 seconds = 254.43 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4250 MB in  2.00 seconds = 2125.25 MB/sec
Timing buffered disk reads:  758 MB in  3.00 seconds = 252.49 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4264 MB in  2.00 seconds = 2132.13 MB/sec
Timing buffered disk reads:  762 MB in  3.01 seconds = 253.02 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4212 MB in  2.00 seconds = 2106.89 MB/sec
Timing buffered disk reads:  758 MB in  3.01 seconds = 252.20 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4248 MB in  2.00 seconds = 2124.00 MB/sec
Timing buffered disk reads:  758 MB in  3.00 seconds = 252.66 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4258 MB in  2.00 seconds = 2129.24 MB/sec
Timing buffered disk reads:  756 MB in  3.00 seconds = 251.96 MB/sec

平均値: 2134.95 MB/s / 252.56 MB/s

中央値: 2129.98 MB/s / 252.58 MB/s

# for i in `seq 1 10`; do hdparm -tT /dev/vg_test/lv_test; sleep 2; done

/dev/vg_test/lv_test:
Timing cached reads:   4218 MB in  2.00 seconds = 2109.05 MB/sec
Timing buffered disk reads:  764 MB in  3.00 seconds = 254.59 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4294 MB in  2.00 seconds = 2147.88 MB/sec
Timing buffered disk reads:  756 MB in  3.00 seconds = 251.67 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4338 MB in  2.00 seconds = 2169.47 MB/sec
Timing buffered disk reads:  756 MB in  3.00 seconds = 251.77 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4162 MB in  2.00 seconds = 2081.51 MB/sec
Timing buffered disk reads:  756 MB in  3.01 seconds = 251.48 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4414 MB in  2.00 seconds = 2207.85 MB/sec
Timing buffered disk reads:  766 MB in  3.00 seconds = 255.16 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4318 MB in  2.00 seconds = 2159.36 MB/sec
Timing buffered disk reads:  756 MB in  3.00 seconds = 251.77 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4188 MB in  2.00 seconds = 2094.74 MB/sec
Timing buffered disk reads:  756 MB in  3.00 seconds = 251.80 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4376 MB in  2.00 seconds = 2187.97 MB/sec
Timing buffered disk reads:  756 MB in  3.00 seconds = 251.77 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4294 MB in  2.00 seconds = 2147.57 MB/sec
Timing buffered disk reads:  756 MB in  3.00 seconds = 251.65 MB/sec

/dev/vg_test/lv_test:
Timing cached reads:   4370 MB in  2.00 seconds = 2185.07 MB/sec
Timing buffered disk reads:  758 MB in  3.01 seconds = 252.06 MB/sec

平均値: 2149.05 MB/s / 252.37 MB/s

中央値: 2153.62 MB/s / 251.77 MB/s

→特に差は無い

dd で読込速度を計測してみる

mdadm	LVM
# for i in `seq 1 10`; do echo 3 > /proc/sys/vm/drop_caches; dd if=/dev/vg_test/lv_test of=/dev/null bs=8192 count=65536; done 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.02273 s, 265 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.01917 s, 266 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.22907 s, 241 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.01664 s, 266 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.02073 s, 266 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.19553 s, 245 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.01653 s, 266 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.02014 s, 266 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.20093 s, 244 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.02021 s, 266 MB/s 平均値: 259 MB/s 中央値: 266 MB/s	# for i in `seq 1 10`; do echo 3 > /proc/sys/vm/drop_caches; dd if=/dev/vg_test/lv_test of=/dev/null bs=8192 count=65536; done 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.0279 s, 265 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.18621 s, 246 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.18632 s, 246 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.01974 s, 266 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.15311 s, 249 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.0195 s, 266 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.01973 s, 266 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.16976 s, 247 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.01961 s, 266 MB/s 65536+0 records in 65536+0 records out 536870912 bytes (537 MB) copied, 2.01981 s, 266 MB/s 平均値: 258 MB/s 中央値: 265 MB/s

mdadm

LVM

# for i in `seq 1 10`; do echo 3 > /proc/sys/vm/drop_caches; dd if=/dev/vg_test/lv_test of=/dev/null bs=8192 count=65536; done

65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.02273 s, 265 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.01917 s, 266 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.22907 s, 241 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.01664 s, 266 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.02073 s, 266 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.19553 s, 245 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.01653 s, 266 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.02014 s, 266 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.20093 s, 244 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.02021 s, 266 MB/s

平均値: 259 MB/s

中央値: 266 MB/s

# for i in `seq 1 10`; do echo 3 > /proc/sys/vm/drop_caches; dd if=/dev/vg_test/lv_test of=/dev/null bs=8192 count=65536; done
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.0279 s, 265 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.18621 s, 246 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.18632 s, 246 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.01974 s, 266 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.15311 s, 249 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.0195 s, 266 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.01973 s, 266 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.16976 s, 247 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.01961 s, 266 MB/s
65536+0 records in
65536+0 records out
536870912 bytes (537 MB) copied, 2.01981 s, 266 MB/s

平均値: 258 MB/s

中央値: 265 MB/s

→特に差は無い

dbench を並列数 5 で計測してみる

mdadm	LVM
dbench version 4.00 - Copyright Andrew Tridgell 1999-2004 Running for 60 seconds with load '/usr/share/dbench/client.txt' and minimum warmup 12 secs (中略) Operation Count AvgLat MaxLat ---------------------------------------- NTCreateX 451463 0.098 165.666 Close 331522 0.004 4.151 Rename 19120 0.363 156.549 Unlink 91215 0.309 510.980 Deltree 10 14.928 40.789 Mkdir 5 0.009 0.013 Qpathinfo 409165 0.020 10.060 Qfileinfo 71644 0.002 2.308 Qfsinfo 75043 0.012 1.461 Sfileinfo 36791 0.378 489.788 Find 158186 0.061 8.076 WriteX 224802 0.154 489.027 ReadX 707482 0.010 5.715 LockX 1468 0.006 0.300 UnlockX 1468 0.004 0.195 Flush 31673 3.839 647.426 Throughput 234.6 MB/sec 5 clients 5 procs max_latency=647.445 ms	# dbench -t 60 -D /mnt/test 5 dbench version 4.00 - Copyright Andrew Tridgell 1999-2004 Running for 60 seconds with load '/usr/share/dbench/client.txt' and minimum warmup 12 secs (中略) Operation Count AvgLat MaxLat ---------------------------------------- NTCreateX 366562 0.125 306.321 Close 269288 0.004 2.691 Rename 15517 0.486 170.861 Unlink 73971 0.369 170.449 Deltree 10 28.031 162.702 Mkdir 5 0.012 0.022 Qpathinfo 332136 0.019 5.028 Qfileinfo 58246 0.003 3.127 Qfsinfo 60910 0.012 2.403 Sfileinfo 29850 0.466 166.712 Find 128437 0.060 10.092 WriteX 182889 0.184 306.434 ReadX 574608 0.011 7.176 LockX 1194 0.006 0.264 UnlockX 1194 0.008 3.876 Flush 25693 5.079 390.863 Throughput 192.689 MB/sec 5 clients 5 procs max_latency=390.881 ms

mdadm

LVM

dbench version 4.00 - Copyright Andrew Tridgell 1999-2004

Running for 60 seconds with load '/usr/share/dbench/client.txt' and minimum warmup 12 secs

(中略)

Operation      Count    AvgLat    MaxLat
----------------------------------------
NTCreateX     451463     0.098   165.666
Close         331522     0.004     4.151
Rename         19120     0.363   156.549
Unlink         91215     0.309   510.980
Deltree           10    14.928    40.789
Mkdir              5     0.009     0.013
Qpathinfo     409165     0.020    10.060
Qfileinfo      71644     0.002     2.308
Qfsinfo        75043     0.012     1.461
Sfileinfo      36791     0.378   489.788
Find          158186     0.061     8.076
WriteX        224802     0.154   489.027
ReadX         707482     0.010     5.715
LockX           1468     0.006     0.300
UnlockX         1468     0.004     0.195
Flush          31673     3.839   647.426

Throughput 234.6 MB/sec  5 clients  5 procs  max_latency=647.445 ms

# dbench -t 60 -D /mnt/test 5
dbench version 4.00 - Copyright Andrew Tridgell 1999-2004

Running for 60 seconds with load '/usr/share/dbench/client.txt' and minimum warmup 12 secs

(中略)

Operation      Count    AvgLat    MaxLat
----------------------------------------
NTCreateX     366562     0.125   306.321
Close         269288     0.004     2.691
Rename         15517     0.486   170.861
Unlink         73971     0.369   170.449
Deltree           10    28.031   162.702
Mkdir              5     0.012     0.022
Qpathinfo     332136     0.019     5.028
Qfileinfo      58246     0.003     3.127
Qfsinfo        60910     0.012     2.403
Sfileinfo      29850     0.466   166.712
Find          128437     0.060    10.092
WriteX        182889     0.184   306.434
ReadX         574608     0.011     7.176
LockX           1194     0.006     0.264
UnlockX         1194     0.008     3.876
Flush          25693     5.079   390.863

Throughput 192.689 MB/sec  5 clients  5 procs  max_latency=390.881 ms

→mdadm の方が早い

結論としては、手元の環境では Software RAID 0 を利用した方が早い可能性が高いっぽい。

本当はランダム読込性能や並列性能を見るべきだけど、dbench 結果でいいよねもう…

※初版で mdadm 計測時に何故か途中で umount しており、RAID 1 の値を掲載して結果がおかしかった点をお詫びします

HiNa
コメント(0)
12/04/26 ~~20:58~~ 21:36

鯖

2012/01/15(日)

アイマスライブに行ってきました

THE IDOLM@STER WINTER C@RNIVAL! の昼・夜 2 公演を見てきました。最近の曲はあまり聞いてないけど、それでもアイマスライブは良いものだ。

そんなことより、品川も渋谷もコインロッカー空いて無くて困った困った。昼公演の開場に間に合わないようになりそうだったので、同行していた（そして夜公演は一緒に参加の）ひだひださんに一旦荷物を預けて「ごめんなさい、コインロッカー空いたら突っ込んで下さい」なんてやる始末。

昼公演が A-800、夜公演が A-80 と全然整理番号が違うのだけど、結局昼・夜ともに同じ場所で見てました。荷物置く位置まで同じ。

アイマスライブの「歌が始まると即サイリウムを適切なものに交換し、全員のサイリウムが綺麗にそろう」というのはやはりなかなか面白いようで。

夏ライブにはもっとウルトラオレンジ持って行きたいｗでも荷物がなあ。その前にチケットか。余分に取ってひだひださんも含めてみんなで見に行きたいものだけど…。

HiNa
コメント(0)
12/01/17 23:56

THE IDOLM@STER

2012/01/14(土)

眼鏡壊れました

ずいぶん昔に、某女史と買いに行った気がする眼鏡(Zoff)を起きた直後に踏んで壊しました…。

壊れたものは仕方が無いので、千葉の Zoff で新しいの作りました。

視力計り直して貰ったんですが、どうも左が過補正になってたらしい…。

右はそのまま、左は若干度を低くした形。

# 前回のが広島、今回のが千葉。大阪で作れよ。

HiNa
コメント(0)
12/01/17 23:22

鋸山に行きました

房総半島にある鋸山へ行ってきました。元々は箱根へ行く予定だったのを、提案に基づいて鋸山へ変更、内房線とロープウェイで。

一人で移動運用するつもりだったのだけど、希望によりひだひださんと一緒に。

アマチュア無線だけして帰るのもよかったのだけど、せっかくなので観光らしいことを……しようとしたのがいけなかった。「整備されています」ってことだったので侮ってた。あの階段は死ねる。「これ降りたら、また登らないといけないんだよね…」とかネガティブな発言がでまくるくらいにきつい。すれ違う人みんなに「あとどのくらいですか？」と聞かれる程度。

汗だくでロープウェイ山頂駅に戻って無線運用。

CQ 出す周波数を探すためにしばらくワッチしていたのだけど、430MHz 帯に空きチャンネルが全くない！ 1 エリア(=関東)は活発で良いですなあ…。

そんなこんなであまり時間は無かった（16:00がロープウェイの最終）ものの、横浜方面と 3 局だけ交信。

局数は少なかったけど、楽しかったから良いや。

# 少ないとはいえ、大阪で移動運用しても知れてる(0～3局程度)ので…。