similar to: SAS or SATA HBA with write cache

I have three zpools on a server and want to add a mirrored pair of ssd''s for the ZIL. Can the same pair of SSDs be used for the ZIL of all three zpools or is it one ZIL SLOG device per zpool? -- This message posted from opensolaris.org

Hi, When deploying ZFS in cluster environment it would be nice to be able to have some SSDs as local drives (not on SAN) and when pool switches over to the other node zfs would pick up the node''s local disk drives as L2ARC. To better clarify what I mean lets assume there is a 2-node cluster with 1sx 2540 disk array. Now lets put 4x SSDs in each node (as internal/local drives). Now

zdb -C shows an shift value on each vdev in my pool, I was just wondering if it is vdev specific, or pool wide. Google didn''t seem to know. I''m considering a mixed pool with some "advanced format" (4KB sector) drives, and some normal 512B sector drives, and was wondering if the ashift can be set per vdev, or only per pool. Theoretically, this would save me some size on

Hello, I''ve looked quickly through the archives and haven''t found mention of this issue. I''m running SXCE (snv_99), which I believe uses zfs version 13. I had an existing zpool: -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20081026/a5e2f25b/attachment.html>

Due to recent experiences, and discussion on this list, my colleague and I performed some tests: Using solaris 10, fully upgraded. (zpool 15 is latest, which does not have log device removal that was introduced in zpool 19) In any way possible, you lose an unmirrored log device, and the OS will crash, and the whole zpool is permanently gone, even after reboots. Using opensolaris,

This might be a stupid question, but here goes... Would adding, say, 4 4 or 8gb usb keys as a zil make enough of a difference for writes on an iscsi shared vol? I am finding reads are not too bad (40is mb/s over gige on 2 500gb drives stripped) but writes top out at about 10 and drop a lot lower... If I where to add a couple usb keys for zil, would it make a difference? Thanks. Sent from a

I have a pool with a single SLOG device rated at Y iops. If I add a second (non-mirrored) SLOG device also rated at Y iops will my zpool now theoretically be able to handle 2Y iops? Or close to that? Thanks, Ray

I was messing around with a ramdisk on a pool and I forgot to remove it before I shut down the server. Now I am not able to mount the pool. I am not concerned with the data in this pool, but I would like to try to figure out how to recover it. I am running Nexenta 3.0 NCP (b134+). I have tried a couple of the commands (zpool import -f and zpool import -FX llift) root at

Hi!We''re trying to pinpoint our performance issues and we could use all the help to community can provide. We''re running the latest version of Nexenta on a pretty powerful machine (4x Xeon 7550, 256GB RAM, 12x 100GB Samsung SSDs for the cache, 50GB Samsung SSD for the ZIL, 10GbE on a dedicated switch, 11x pairs of 15K HDDs for the pool). We''re connecting a single Linux

Hi I''m running OpenSolaris 148 on a few boxes, and newer boxes are getting installed as we speak. What would you suggest for a good SLOG device? It seems some new PCI-E-based ones are hitting the market, but will those require special drivers? Cost is obviously alsoo an issue here.... Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 97542685 roy at karlsbakk.net

My setup: A SuperMicro 24-drive chassis with Intel dual-processor motherboard, three LSI SAS3081E controllers, and 24 SATA 2TB hard drives, divided into three pools with each pool a single eight-disk RAID-Z2. (Boot is an SSD connected to motherboard SATA.) This morning I got a cheerful email from my monitoring script: "Zchecker has discovered a problem on bigdawg." The full output is

I''m working with a Cyrus IMAP server running on a T2000 box under Solaris 10 10/09 with current patches. Mailboxes reside on six ZFS filesystems, each containing about 200 gigabytes of data. These are part of a single zpool built on four Iscsi devices from our Netapp filer. One of these ZFS filesystems contains a number of global and per-user databases in addition to one sixth of the

The standard controller that has been recommended in the past is the AOC-SAT2-MV8 - an 8 port with a marvel chipset. There have been several mentions of LSI based controllers on the mailing lists and I''m wondering about them. One obvious difference is that the Marvel contoller is PCI-X and the LSI controllers are PCI-E. Supermicro have several LSI controllers. AOC-USASLP-L8i with the

# zpool list NAME SIZE USED AVAIL CAP HEALTH ALTROOT jira-app-zpool 272G 330K 272G 0% ONLINE - The following command hangs forever. If I reboot the box , zpool list shows online as I mentioned the output above. # zpool destroy -f jira-app-zpool How can get rid of this pool and any reference to it. bash-3.00# zpool status pool: jira-app-zpool state: UNAVAIL

I have a 24 x 1TB system being used as an NFS file server. Seagate SAS disks connected via an LSI 9211-8i SAS controller, disk layout 2 x 11 disk RAIDZ2 + 2 spares. I am using 2 x DDR Drive X1s as the ZIL. When we write anything to it, the writes are always very bursty like this: ool 488K 20.0T 0 0 0 0 xpool 488K 20.0T 0 0 0 0 xpool

Hi all. A quick question about the checksum error detection routines in ZFS. Surely ZFS can decide about checksum errors in a redundant environment but what about an non-redundant one? We connected a single RAID5 array to a v440 as a NFS server and while doing backups and the like we see the "zpool status -v" checksum error counters increment once in a while. Nevertheless the

Hey, guys I just do the test for use loop device as vdev for zpool Procedures as followings: 1) mkfile -v 100m disk1 mkfile -v 100m disk2 2) lofiadm -a disk1 /dev/lofi lofiadm -a disk2 /dev/lofi 3) zpool create pool_1and2 /dev/lofi/1 and /dev/lofi/2 4) zpool export pool_1and2 5) zpool import pool_1and2 error info here: bash-3.00# zpool import pool1_1and2 cannot import

Hi experts zpool import shows some weird config of an old zpool bash-3.00# zpool import pool: data1 id: 7539031628606861598 state: FAULTED status: One or more devices are missing from the system. action: The pool cannot be imported. Attach the missing devices and try again. see: http://www.sun.com/msg/ZFS-8000-3C config: data1 UNAVAIL insufficient replicas

Hello, I have a Dell 2950 with a Perc 5/i, two 300GB 15K SAS drives in a RAID0 array. I am considering going to ZFS and I would like to get some feedback about which situation would yield the highest performance: using the Perc 5/i to provide a hardware RAID0 that is presented as a single volume to OpenSolaris, or using the drives separately and creating the RAID0 with OpenSolaris and ZFS? Or

Hi, I have a mirror pool tank having two devices underneath. Created in this way #zpool create tank mirror c3t500507630E020CEAd1 c3t500507630E020CEAd0 Created file system tank/home #zfs create tank/home Created another file system tank/home #zfs create tank/home/sridhar After that I have created files and directories under tank/home and tank/home/sridhar. Now I detached 2nd device i.e