Hi Jon,
1. Well thats more depending on how apllications will be writing to that
disk. So you would have to
play around with that a bit. A good starting point seemed 64K.
2. The number of channels is not a problem here. Hardware will
load-balance over all available
channels. The bottleneck is rather the driver tat only issues one
request at a time. You can't
control which channel path is used and one device doesn't use all the
andwidth of a channel
path. So you should/must rather use 12stripes because
3. LVM wants to put <volume size>/<stripes> to each disk and won't add
space from another space
do so. So 27G/8 requires around 3G on 8 free PVs and yours only have
2.25G.. So 12 stripes
should work.8 won't.
Regards,
Stefan Bader
SW Linux on zSeries Development & Services
[EMAIL PROTECTED]
----------------------------------------------------------------------------------
When all other means of communication fail, try words.
Linux on 390 Port <[email protected]> wrote on 04.01.2006 16:23:25:
> Hi, all,
> WE have a 25 GB file system that is not performing well for us.
> In order to help matters, I have shuffled things around to allow VM
> access to a greater number of channel paths to our DASD subsystem (a
> Storagetek V2X). I have formatted the new volumes and done the
> pvcreate and vgcreate commands, but when I issue the lvcreate
> command to create the actual logical volume I am getting an error.
> A few questions:
> 1. What is the optimal stripe size for a 3390-3 device?
> 2. I have 12 volumes I will be using, but only 8 channel paths
> to those volumes. Would I be better off to use 8 stripes or 12?
> 3. I have 27 GB available in the volume group, so why am I
> getting the "not enough allocatable/free volume space" message?
>
>
> Here is a transcript of what I am attempting (vgdocs02 and lvdocs02
> are the new things):
>
>
>
>
> [EMAIL PROTECTED] root]# pvscan
> pvscan -- reading all physical volumes (this may take a while...)
> pvscan -- ACTIVE PV "/dev/dasdf1" of VG "vgdb01" [6.84 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdg1" of VG "vgdb01" [6.84 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdh1" of VG "vgdb01" [6.84 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdi1" of VG "vgdb01" [6.84 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdj1" of VG "vgdb01" [6.84 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdk1" of VG "vgdb01" [6.84 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdl1" of VG "vgdb01" [6.84 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdm1" of VG "vgdb01" [6.84 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdn1" of VG "vgdb01" [6.84 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdo1" of VG "vgdb01" [6.84 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdp1" of VG "vgdb01" [6.84 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdq1" of VG "vgdb01" [6.84 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdr1" of VG "vgdocs01" [2.25 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasds1" of VG "vgdocs01" [2.25 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdt1" of VG "vgdocs01" [2.25 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdu1" of VG "vgdocs01" [2.25 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdv1" of VG "vgdocs01" [2.25 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdw1" of VG "vgdocs01" [2.25 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdx1" of VG "vgdocs01" [2.25 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdy1" of VG "vgdocs01" [2.25 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdaa1" of VG "vgdocs01" [2.25 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdab1" of VG "vgdocs01" [2.25 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdac1" of VG "vgdocs01" [2.25 GB / 0 free]
> pvscan -- ACTIVE PV "/dev/dasdad1" of VG "vgdocs01" [2.25 GB / 1.25 GB
free]
> pvscan -- ACTIVE PV "/dev/dasdai1" of VG "vgdocs02" [2.25 GB / 2.25 GB
free]
> pvscan -- ACTIVE PV "/dev/dasdaj1" of VG "vgdocs02" [2.25 GB / 2.25 GB
free]
> pvscan -- ACTIVE PV "/dev/dasdak1" of VG "vgdocs02" [2.25 GB / 2.25 GB
free]
> pvscan -- ACTIVE PV "/dev/dasdal1" of VG "vgdocs02" [2.25 GB / 2.25 GB
free]
> pvscan -- ACTIVE PV "/dev/dasdam1" of VG "vgdocs02" [2.25 GB / 2.25 GB
free]
> pvscan -- ACTIVE PV "/dev/dasdan1" of VG "vgdocs02" [2.25 GB / 2.25 GB
free]
> pvscan -- ACTIVE PV "/dev/dasdao1" of VG "vgdocs02" [2.25 GB / 2.25 GB
free]
> pvscan -- ACTIVE PV "/dev/dasdap1" of VG "vgdocs02" [2.25 GB / 2.25 GB
free]
> pvscan -- ACTIVE PV "/dev/dasdaq1" of VG "vgdocs02" [2.25 GB / 2.25 GB
free]
> pvscan -- ACTIVE PV "/dev/dasdar1" of VG "vgdocs02" [2.25 GB / 2.25 GB
free]
> pvscan -- ACTIVE PV "/dev/dasdas1" of VG "vgdocs02" [2.25 GB / 2.25 GB
free]
> pvscan -- ACTIVE PV "/dev/dasdat1" of VG "vgdocs02" [2.25 GB / 2.25 GB
free]
> pvscan -- total: 36 [137.53 GB] / in use: 36 [137.53 GB] / in no VG: 0
[0]
>
> [EMAIL PROTECTED] root]# vgscan
> vgscan -- reading all physical volumes (this may take a while...)
> vgscan -- found active volume group "vgdb01"
> vgscan -- found active volume group "vgdocs01"
> vgscan -- found active volume group "vgdocs02"
> vgscan -- "/etc/lvmtab" and "/etc/lvmtab.d" successfully created
> vgscan -- WARNING: This program does not do a VGDA backup of your
> volume groups
>
> [EMAIL PROTECTED] root]# vgdisplay vgdocs02
> --- Volume group ---
> VG Name vgdocs02
> VG Access read/write
> VG Status available/resizable
> VG # 2
> MAX LV 256
> Cur LV 0
> Open LV 0
> MAX LV Size 2 TB
> Max PV 256
> Cur PV 12
> Act PV 12
> VG Size 27 GB
> PE Size 32 MB
> Total PE 864
> Alloc PE / Size 0 / 0
> Free PE / Size 864 / 27 GB
> VG UUID HFK82N-4DWM-GkFl-wxSe-Vpvu-gozi-dDm2af
>
>
> [EMAIL PROTECTED] root]# lvcreate --stripes 8 -L24G -n lvdocs02 vgdocs02
> lvcreate -- INFO: using default stripe size 16 KB
> lvcreate -- not enough allocatable/free physical volume space in
"vgdocs02"
> lvcreate -- please check, if physical volumes are allocatable
>
>
> [EMAIL PROTECTED] root]# pvdisplay /dev/dasdai1
> --- Physical volume ---
> PV Name /dev/dasdai1
> VG Name vgdocs02
> PV Size 2.29 GB [4806528 secs] / NOT usable 32.19 MB
> [LVM: 128 KB]
> PV# 1
> PV Status available
> Allocatable yes
> Cur LV 0
> PE Size (KByte) 32768
> Total PE 72
> Free PE 72
> Allocated PE 0
> PV UUID v14tEH-5SG7-7UEM-vjr7-mZSZ-jww1-8bicMw
>
>
> [EMAIL PROTECTED] root]# pvdisplay /dev/dasdaj1
> --- Physical volume ---
> PV Name /dev/dasdaj1
> VG Name vgdocs02
> PV Size 2.29 GB [4806528 secs] / NOT usable 32.19 MB
> [LVM: 128 KB]
> PV# 2
> PV Status available
> Allocatable yes
> Cur LV 0
> PE Size (KByte) 32768
> Total PE 72
> Free PE 72
> Allocated PE 0
> PV UUID 30Y2q1-mpcZ-eM0I-QNS7-QcpU-Gyu6-2KaIMH
>
>
> [EMAIL PROTECTED] root]# pvdisplay /dev/dasdak1
> --- Physical volume ---
> PV Name /dev/dasdak1
> VG Name vgdocs02
> PV Size 2.29 GB [4806528 secs] / NOT usable 32.19 MB
> [LVM: 128 KB]
> PV# 3
> PV Status available
> Allocatable yes
> Cur LV 0
> PE Size (KByte) 32768
> Total PE 72
> Free PE 72
> Allocated PE 0
> PV UUID 24w3Bd-XqF9-kNNR-EquK-Pfnn-F17a-lm4OU6
>
>
> [EMAIL PROTECTED] root]# pvdisplay /dev/dasdal1
> --- Physical volume ---
> PV Name /dev/dasdal1
> VG Name vgdocs02
> PV Size 2.29 GB [4806528 secs] / NOT usable 32.19 MB
> [LVM: 128 KB]
> PV# 4
> PV Status available
> Allocatable yes
> Cur LV 0
> PE Size (KByte) 32768
> Total PE 72
> Free PE 72
> Allocated PE 0
> PV UUID yuQiHL-eHwd-fXEV-ToqA-pCiT-TA4k-HDw2ai
>
>
> [EMAIL PROTECTED] root]# pvdisplay /dev/dasdam1
> --- Physical volume ---
> PV Name /dev/dasdam1
> VG Name vgdocs02
> PV Size 2.29 GB [4806528 secs] / NOT usable 32.19 MB
> [LVM: 128 KB]
> PV# 5
> PV Status available
> Allocatable yes
> Cur LV 0
> PE Size (KByte) 32768
> Total PE 72
> Free PE 72
> Allocated PE 0
> PV UUID mYWTT9-DZ0W-RrPZ-Lljt-TBDv-CBne-OJjykz
>
>
> [EMAIL PROTECTED] root]# pvdisplay /dev/dasdan1
> --- Physical volume ---
> PV Name /dev/dasdan1
> VG Name vgdocs02
> PV Size 2.29 GB [4806528 secs] / NOT usable 32.19 MB
> [LVM: 128 KB]
> PV# 6
> PV Status available
> Allocatable yes
> Cur LV 0
> PE Size (KByte) 32768
> Total PE 72
> Free PE 72
> Allocated PE 0
> PV UUID j84rRk-AvoF-7W51-b2jd-B04c-g5uR-nRAW30
>
>
>
> Thanks,
> Jon
>
> ----------------------------------------------------------------------
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> send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or
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