From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx04.extmail.prod.ext.phx2.redhat.com [10.5.110.8]) by int-mx01.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id o7BMQS46029459 for ; Wed, 11 Aug 2010 18:26:28 -0400 Received: from mail-ww0-f46.google.com (mail-ww0-f46.google.com [74.125.82.46]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id o7BMQJ0Z020271 for ; Wed, 11 Aug 2010 18:26:20 -0400 Received: by wwb18 with SMTP id 18so674660wwb.27 for ; Wed, 11 Aug 2010 15:26:19 -0700 (PDT) MIME-Version: 1.0 Date: Wed, 11 Aug 2010 17:26:18 -0500 Message-ID: From: Daksh Chauhan Content-Transfer-Encoding: 8bit Subject: Re: [linux-lvm] calculating free capacity from pvdisplay and lvdisplay Reply-To: daksh@olemiss.edu, LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="utf-8" To: linux-lvm@redhat.com This is interesting, and I understand your explaination Ray... But, how can I figure out how much data is on each PVs?? I have something similar setup, and I have scripts (and cacti) to see disk IO for each PVs, but I would really like to see how much data is on each PV... Thank you, > Date: Wed, 11 Aug 2010 01:10:31 -0500 > From: Ray Morris > To: LVM general discussion and development > Subject: Re: [linux-lvm] calculating free capacity from pvdisplay and > � � � �lvdisplay > Message-ID: <1281507031.21952.1@raydesk1.bettercgi.com> > Content-Type: text/plain; charset=us-ascii; DelSp=Yes; Format=Flowed > >> B. Thus the total full space would come to 4.89 TB. But the sum of >> full >> space of all my LV's is only around 3 TB (based on the output of df) > > It's the same thing as making a new partition covering your whole drive, > then wondering why fdisk says you can't make another partition. �Just > because you haven't stored files in that partition, it's still takes > up the whole drive. > > df shows that your LVs take up 8.6TB: 6TB + 600 GB + 2 TB. > Therefore, you are using 8.6TB of disk space for those LVs. > Some of the space WITHIN each LV might not be used for files, > but it has been dedicated to that LV. > > df also shows that the filesystems on the LVs have free space for > more files. �So you can put more files on those LVs, which is a > different thing than having space to make more LVs. > > I'm not good at explaining things, so sometimes I try explaining three > different ways. �I have six cereal boxes, each half empty. �I put the > boxes in a bag. �The bag is now full. �The cereal boxes may not be full, > but they fill up the bag. �The cereal boxes are your half empty LVs and > the bag is your drives. > > Layers: > > hard drive > partition (can be skipped) > physical volume > volume group > logical volume > file system > -- > Ray Morris > support@bettercgi.com > > Strongbox - The next generation in site security: > http://www.bettercgi.com/strongbox/ > > Throttlebox - Intelligent Bandwidth Control > http://www.bettercgi.com/throttlebox/ > > Strongbox / Throttlebox affiliate program: > http://www.bettercgi.com/affiliates/user/register.php > > > On 08/10/2010 09:25:15 PM, Rahul Nabar wrote: >> Some of the physical volumes show "Allocatable � � � � � yes (but >> full)" while others don't. How does one relate this to the actual >> capacity? THe reason I am confused is that 3 of my PV's show up as >> full and each is 1.63 TB. Thus the total full space would come to 4.89 >> TB. But the sum of full space of all my LV's is only around 3 TB >> (based on the output of df) >> >> I've reproduced the outputs of pvdisplay, lvdisplay and df below. >> >> I'm confused! Any pointers? >> >> -- >> Rahul >> >> >> [root@eustorage ~]# pvdisplay >> � --- Physical volume --- >> � PV Name � � � � � � � /dev/sdb >> � VG Name � � � � � � � euclid_highperf_storage >> � PV Size � � � � � � � 1.63 TB / not usable 4.00 MB >> � Allocatable � � � � � yes (but full) >> � PE Size (KByte) � � � 4096 >> � Total PE � � � � � � �428351 >> � Free PE � � � � � � � 0 >> � Allocated PE � � � � �428351 >> � PV UUID � � � � � � � wDdbmP-2n5m-98HD-Ewqk-Q3y0-lnMf-rsaVXt >> >> � --- Physical volume --- >> � PV Name � � � � � � � /dev/sdc >> � VG Name � � � � � � � euclid_highperf_storage >> � PV Size � � � � � � � 1.63 TB / not usable 4.00 MB >> � Allocatable � � � � � yes (but full) >> � PE Size (KByte) � � � 4096 >> � Total PE � � � � � � �428351 >> � Free PE � � � � � � � 0 >> � Allocated PE � � � � �428351 >> � PV UUID � � � � � � � 75i75q-2rec-2FMf-eyPa-W0nF-zFHH-PIAvvc >> >> � --- Physical volume --- >> � PV Name � � � � � � � /dev/sdd >> � VG Name � � � � � � � euclid_highperf_storage >> � PV Size � � � � � � � 1.63 TB / not usable 4.00 MB >> � Allocatable � � � � � yes (but full) >> � PE Size (KByte) � � � 4096 >> � Total PE � � � � � � �428351 >> � Free PE � � � � � � � 0 >> � Allocated PE � � � � �428351 >> � PV UUID � � � � � � � vo2Jh2-PfFC-eOj4-GYnP-Jx1I-Sisu-2nY4lC >> >> � --- Physical volume --- >> � PV Name � � � � � � � /dev/sde >> � VG Name � � � � � � � euclid_highperf_storage >> � PV Size � � � � � � � 1.63 TB / not usable 4.00 MB >> � Allocatable � � � � � yes >> � PE Size (KByte) � � � 4096 >> � Total PE � � � � � � �428351 >> � Free PE � � � � � � � 38140 >> � Allocated PE � � � � �390211 >> � PV UUID � � � � � � � EK7cvF-IZjf-PJVw-d2RR-lCdt-kOSD-iqFtOf >> >> � --- Physical volume --- >> � PV Name � � � � � � � /dev/sdf >> � VG Name � � � � � � � euclid_highperf_storage >> � PV Size � � � � � � � 1.63 TB / not usable 4.00 MB >> � Allocatable � � � � � yes >> � PE Size (KByte) � � � 4096 >> � Total PE � � � � � � �428351 >> � Free PE � � � � � � � 140607 >> � Allocated PE � � � � �287744 >> � PV UUID � � � � � � � fQXN8S-HhYu-weoq-kbuz-BrxZ-6WQk-6ydBDw >> >> � --- Physical volume --- >> � PV Name � � � � � � � /dev/sdg >> � VG Name � � � � � � � euclid_highperf_storage >> � PV Size � � � � � � � 1.63 TB / not usable 4.00 MB >> � Allocatable � � � � � yes >> � PE Size (KByte) � � � 4096 >> � Total PE � � � � � � �428351 >> � Free PE � � � � � � � 140607 >> � Allocated PE � � � � �287744 >> � PV UUID � � � � � � � i7GD1d-rbd2-efKd-uK3u-D3S2-BxJv-UkrNve >> >> [root@eustorage ~]# df -h >> Filesystem � � � � � �Size �Used Avail Use% Mounted on >> /dev/sda2 � � � � � � �76G �8.6G � 64G �12% / >> /dev/sda6 � � � � � � �19G �365M � 17G � 3% /var >> /dev/sda5 � � � � � � �15G �165M � 14G � 2% /tmp >> /dev/sda1 � � � � � � 487M � 17M �445M � 4% /boot >> tmpfs � � � � � � � � �24G � � 0 � 24G � 0% /dev/shm >> /dev/mapper/euclid_highperf_storage-LV_home >> � � � � � � � � � � � 6.0T �1.4T �4.4T �24% /home >> /dev/mapper/euclid_highperf_storage-LV_export >> � � � � � � � � � � � 591G � 17G �550G � 3% /opt >> /dev/mapper/euclid_highperf_storage-LV_polhome >> � � � � � � � � � � � 2.0T �1.5T �386G �80% /polhome >> [root@eustorage ~]# lvdisplay >> � --- Logical volume --- >> � LV Name � � � � � � � �/dev/euclid_highperf_storage/LV_home >> � VG Name � � � � � � � �euclid_highperf_storage >> � LV UUID � � � � � � � �gu7yo1-TYYr-ucHG-QSDk-y8HD-ETrs-Z5kCk9 >> � LV Write Access � � � �read/write >> � LV Status � � � � � � �available >> � # open � � � � � � � � 1 >> � LV Size � � � � � � � �6.00 TB >> � Current LE � � � � � � 1572864 >> � Segments � � � � � � � 1 >> � Allocation � � � � � � inherit >> � Read ahead sectors � � auto >> � - currently set to � � 1536 >> � Block device � � � � � 253:0 >> >> � --- Logical volume --- >> � LV Name � � � � � � � �/dev/euclid_highperf_storage/LV_export >> � VG Name � � � � � � � �euclid_highperf_storage >> � LV UUID � � � � � � � �1lktLy-Hgn3-qS1m-41VJ-5kNY-DMyb-1ri4Th >> � LV Write Access � � � �read/write >> � LV Status � � � � � � �available >> � # open � � � � � � � � 1 >> � LV Size � � � � � � � �600.00 GB >> � Current LE � � � � � � 153600 >> � Segments � � � � � � � 1 >> � Allocation � � � � � � inherit >> � Read ahead sectors � � auto >> � - currently set to � � 1536 >> � Block device � � � � � 253:1 >> >> � --- Logical volume --- >> � LV Name � � � � � � � �/dev/euclid_highperf_storage/LV_polhome >> � VG Name � � � � � � � �euclid_highperf_storage >> � LV UUID � � � � � � � �xqpOX5-HFey-H0qi-NgjP-NVS7-FwDb-zbiK8m >> � LV Write Access � � � �read/write >> � LV Status � � � � � � �available >> � # open � � � � � � � � 1 >> � LV Size � � � � � � � �2.00 TB >> � Current LE � � � � � � 524288 >> � Segments � � � � � � � 4 >> � Allocation � � � � � � inherit >> � Read ahead sectors � � auto >> � - currently set to � � 256 >> � Block device � � � � � 253:2 >> >> _______________________________________________ >> linux-lvm mailing list >> linux-lvm@redhat.com >> https://www.redhat.com/mailman/listinfo/linux-lvm >> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ >> >> >