SAS: full duplex
SATA: half duplex
SAS: dual port
SATA: single port (some enterprise SATA has dual port)
SAS: 2 active channel - 2 concurrent write, or 2 read, or 1 write and 1 read
SATA: 1 active channel - 1 read or 1 write
SAS: Full error detection and recovery on both read and write
SATA:
That must be a combination of many things to make it happen.
ie. expander revision, SAS HBA revision, firmware, disk model, firmware, etc.
I didn't see the problem on my system but I haven't used SATA disks with it so
I can't say.
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I just tried to create a new share and got the same error.
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They are fast when they are new. Once all the blocks are written, performance
degrades significantly. SLC will also degrade over time, but when it needs to
erase blocks and rewrite, it is much faster than MLC. That's why for ZIL, SLC
SSD is prefered.
It's possible to remove MLC ZIL and use
You can use the utility to erase all blocks and regain performance, but it's a
manual process and quite complex. Windows 7 support TRIM, if SSD firmware also
supports it, the process is run in the background so you will not notice
performance degrade. I don't think any other OS supports TRIM.
You can get the E2 version of the chassis that supports multipathing but you
have to use dual port SAS disks. Or you can use seperate SAS hba to connect to
seperate jbos chassis and do mirror over 2 chassis. The backplane is just a
path-through fabric which is very unlikely to die.
Then like
You can use VCB to backup.
In my test lab, I use VCB integrated with Bacula to backup all the VMs.
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Seems like upgrading from b126 to b127 will have the same problem.
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I think I finally see what you mean.
# luactivate b126
System has findroot enabled GRUB
ERROR: Unable to determine the configuration of the current boot environment
b125.
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I just finished the upgrade.
detach one disk from the mirror, then luactivate b126 and init 6, after it
reboots, attach the disk to the mirror again, all went smoothly.
Thanks a lot.
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Sorry, do you mean luupgrade from previous versions or from 125 to future
versions?
I luupgrade from 124 to 125 with mirrored root pool and everything is working
fine.
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What luupgrade do you use?
I uninstall lu package in current build first, then install new lu package in
the verion to upgrade.
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I think the raid card is a re-branded LSI SCSI raid. I have LSI 21320-4x and
having same problem with ZFS.
Do you have BBU on the card? You may want to disable cache flush and zil and
see how it works. I tried passthrough and basically the result is same.
I gave up on tuning this card with
Can you use SATA drives with expanders at all? (I have to stick to
enterprise/nearline SATA (100 EUR/TByte vs. 60 EUR/TByte consumer SATA) for
cost reasons).
Yes you can in E1 model. E1 is single path model which supports both SAS and
SATA. You need to know what you are buying. The Supermicro
You can optimize for better IOPS or for transfer speed. NS2 SATA and SAS share
most of the design, but they are still different, cache, interface, firmware
are all different.
Then by much better, I don't mean just IOPS, it's all the 3, better IOPS,
command queue and error recovery, etc.
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Why do you need 3x LSI SAS3081E-R? The back plane has LSI SAS x36 expander so
you only nedd 1x 3081E. If you want multipathing, you need E2 model.
Second, I'd say use Seagate ES 2 1TB SAS disk especially if you want
multipathing. I believe E2 only supports SAS disks.
I have Supermicro 936E1
On 4-Aug-09, at 19:46 , Chris Du wrote:
Yes Constellation, they also have sata version.
CA$350 is way too
high. It's CA$280 for SAS and CA$235 for SATA,
500GB in Vancouver.
Wow, that is a much better price than I've seen:
http://pricecanada.com/p.php/Seagate-Constellation-720
0
I'd create a mirror for rpool and the rest in another pool using raidz2.
Another note, have you bought disks already? You may want to take a look at
2.5 SAS disks from Seagate as they are enterprise grade with different
firmware for better error recovery. I know the SAS backplane is picky
Yes Constellation, they also have sata version. CA$350 is way too high. It's
CA$280 for SAS and CA$235 for SATA, 500GB in Vancouver.
If you already have the disks, then forget about it.
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i7 doesn't support ECC even motherboard supports it, you need XEON W3500 which
costs the same as i7 to support ECC.
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I'm building my new storage server, all the parts should come in this week.
Intel XEON W3520 quad-core
12G DDR3-1333 ECC ram
2*74G 15K rpm SAS for OS
8*1T SATA disks in raiz2 or stripe 2 sets of 4-disk raidz
32G Intel X25-E SSD (may mirror it later)
2*Intel 82574L NIC
Qlogic 4Gb QLE2460 FC HBA
I
Do you know 7200.11 has firmware bugs?
Go to seagate website to check.
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